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Hello Mr Scotty. So many words with pics you have said in the past got me in tears sometimes till today😭👍. One example was when you said the undercarriage was "rock hard" with a viagra sign😭😭💀
Those high performance cars backfire during rev deceleration because they're designed to do so. Some of them seem to be doing it just for fun, but the more serious high performance cars do it because fuel is being dumped in order to cool the valves and and that fuel then ignites in the exhaust. Have you never heard of this? If you still think it doesn't make sense, what better method do you propose for keeping valves cool (these cars also often have titanium intake and sodium filled exhaust valves)?
Illegal ways to make your car faster: 1. No muffler’s (causes backfire if not tuned) 2. No catalytic converters (fails emissions test) 3. Nitrous Oxide (can blow up engines, legal in some states only) 4. Bigger fuel injectors (ecu tuning a must) Thank you Scotty for all the info you give us. I especially loved this one lol 🙏
It especially sucks when they are intentionally done in the most backward, counterproductive and mechanically illiterate way possible. It's done by emission per gallon of fuel. I guarantee my car is cleaner, burning 1/3 the fuel per mile than stock if emission tests were done by sane people.
@@Febreeze_Odor_Eliminator other states are joining in. the whole west coast and east coast have the same restrictions. washington, oregon, california, new york, vermont, massachusetts, etc. all have sections of the state that follow california CARB law. the difference is those laws tend to be in the more populated areas (in oregon it only applies to the portland metro area for example) while cali has it for the whole state. but if you live in any of those big cities you need to do tests and it gets pretty sketchy as a car tuner
It’s a shame that there are so many crooked mechanics out there but when you see one honest like this guy i rather spend my hard earn money on this guy or any honest mechanic. They deserve the work.
"Never assume there is only one problem" is some of the best car advice one can get, especially for a DIY mechanic learning to work on their own rides. A lot of people work on their own cars to save time and/or money, but if youre not careful and thorough, you'll lose a lot of both. One thing my dad taught me as a kid "before you start trying to fix your own car, get a bus pass and make sure your bicycle is in good shape". We laughed, but its so true
If it is against federal law to remove a catalytic converter from a car, then why aren't car thieves charged with a federal crime? That would put such thieves in jail for longer and less cats would be stolen and the air would be cleaner. Win, win for everyone.
@@John-zp2jm The drivers who still have them on there cars could take extra steps to deter theft. I suspect a lot of them " stolen" are insurance scams. Same as stuff stolen from your car, when Christmas shopping.
The "don't need back pressure" thing is especially true for turbocharged cars. You want as little restriction as possible after the turbine, otherwise the pressure will actually hurt the spooling characteristics of the turbocharger. It's why on big turbo cars, you see the catalytic converter either: replaced with a high flow racing cat, removed, or moved farther down stream to reduce restriction and improve turbo spooling. Even a small size upgrade, changing to a lower restriction exhaust has improved responsiveness due to letting that turbo spool more rapidly.
Agreed, just bought an X5 M twin turbo V-8 all tricked out for the track. It has after market straight pipes that are 1.5" larger than the stock 'M racing package' that came on it. All the UPGRADES took it from a 600hp family race car to over 800hp. Cost $1800 / year in tires driving it under "normal" traffic conditions. 🤣
@@LynchMob09R no, since the blow off's function is just to prevent pressure buildup in the intake to either keep the turbine spinning after you let go of the gas pedal and close the throttle valve, or limit the maximum pressure to keep your engine in 1 piece. Back pressure in the muffler will have an effect on how much the turbine can spin or keep spinning since the exhaust pressure and flow is the active force that makes the turbine spin.
@@exzzistfym DEF - Diesel exhaust fluid. DEF is 30% urea, 70% water and is injected into the exhaust gases of diesel engines just before the catalytic converter. It aids the catalytic converter in converting NOx's (pollution) back into nitrogen (N2) and water.
When I lived in California back in the 80's, I inherited a 6 cyl. Ford Granada. Just like Scotty described, the time came when I couldn't get over 35 or 40 mph. My mechanic friend 'fixed' the problem by simply removing the honeycomb from inside the CAT with a pair of pliers. The car passed the smog test every time.
@@jayalli707 auto mechanics 101 tells me that it was coincidental that you blew up the engine by removing the restriction in the cat. I filled up at Shell one day instead and Chevron and the next day a ball joint let go on the right front wheel.
@@andrewwasson6153 ha! NEVER cheat on your gas station. The old tymers swear by taking out the cat. I've always had hard luck with it, all those one times.
A lot of "high performance" mufflers are designed to have higher flow rates to reduce the negative effects a muffler has on your car. The downside is that they won't be as quiet as a typical muffler and most are dramatically more expensive than typical mufflers. But sometimes halfway is the best you can legally get.
Magna Flow muffs are excellent. Straight thruogh perforated tube with a non-deteriorating sound absorbtion material. No drone & minimally increase exhaust volume. I've run them for 30 years. ALL mufflers with baffles, even "high performance" versions are detrimental to performance. It's called "fluid dynamics" & a common example are rocks in a stream. Every rock disrupts smooth flow & the same thing happens in an exhaust. The newer cats are very minimally restrictive.
I can attest to your catalytic converter solution!!! My van's converter was jingling for a few months; not too bad but getting worse. I used the laquer thinner on half a tank of gas. After a few hours driving, I never heard that sound again; that was 7 yrs ago. (that was awesome also!! thanks so much Scotty)
When I first bought my 2003 Nissan Xterra 4x4 it had engine check light on. That is what my mechanic had said "you need catalytic converter". This vehicle catalytic converter cost a lot for OEM ones. I just drove it like that for a few years and now it had passed smog check. I had used the thinner Scotty had recommended when I first got my car, but it didn't work at the time. So l do the European cleaning😁 Scotty had recommended. Went for a long trips going around 70mph that seems to help. Now no more engine check light and passed smog in 2021. Yay!😅
Hey Scotty, you're usually 100% spot on. BUT......there are engine tuners who can alter the Engine Control Module (ECM) that can tune your car to BETTER gas mileage, go from 1 7/8" to 3 1/2" exhaust (for turbos) and make it run faster & better. I've had a Miata that I added a 2.5 Liter Ford Focus engine, a turbo, and big 3" stainless steel exhaust & muffler. It was a BLAST to drive!
I wonder what it would sound like if Scotty directed the Philadelphia Orchestra with his normal car video hand movements? It may be a big hit, lol. I like Scotty.
His content truly is great. I'm a 20+ year automotive technician, and I still love to watch his videos. I already know what's going to come out of his mouth before he says it... but he's just a pleasure to listen to, so i watch anyway! 😂
Love all of your posts. In technical terms Engine Engineers use. Backfire is when an engine fires Back through the intake. Afterfire is when an engine fires after the exhaust.
Thank you for that explanation about back pressure. I can’t stand it when I get on forums trying to research a certain mod for my 392 challenger and I constantly see guys scared to do certain mods because “it’ll reduce the back pressure.” The only engine to my knowledge that needs back pressure is a diesel motor.
The only time back pressure is a hindrance is if you run your engine at full throttle, all the time. That's hardly the case in a car on the street used for transportation. You're lucky if you use 10 to 15 HP going down the freeway on a clean aerodynamic car on level ground. That's nothing when the engine can make 300 -600 hp. Even Turbochargers make a lot of back pressure, by a factor of 3:1 on the turbine side vs the compressor side. So if you're making 25# of boost on the compressor side of a turbo diesel, there's about 75# of back pressure on the turbine exhaust side. Can't get one without the other. Don't say it's bad, lots of vehicles run turbochargers and run full throttle applications, and the back pressure on the exhaust does no harm.
Minor correction: the SAAB Sonett had either a three-cylinder two-stroke engine, or a V4, four-stroke engine sourced from Ford. A long time ago I really wanted a two-stroke Sonett but I never saw one. I did have a '67 SAAB 96 Monte Carlo, and that model's high-performance two-stroke engine (60 HP!) had three carburetors (the highest carburetor-to-cylinder ratio of any car I ever owned). I don't know if the two-stroke Sonett came with the triple-carb engine, but as it was a sports car my guess is that it did.
Yes, the V4 used in late 60s to mid 70s SAABs, was a German Ford engine built in Cologne and introduced in 1962, and powered the Ford Taunus. I learned to drive in my dad's 68 SAAB 96. He had been interested in the Sonett II which were all 3 cylinder 2 strokes. But he was too tall to sit in it. His two previous cars, a Lloyd (British) and a DKW (German, one of the 4 companies that merged to eventually form Audi, hence 4 interlocking ring logo) were both 2 stroke, fwd. The 68 SAAB 96 was available with either the 3 cylinder 2 stroke or the V4 4 stroke. He opted for the larger displacement V4. Btw the Sonett pic Scottie showed was of a Sonett III, which were all V4 4 strokes
Back in 88 I took the mufflers off my 86 Mustang 302. The straight pipes worked great, and the sound was awesome. Luckily for me at that time, in New Hampshire, the cat kept the noise down to just below the legal threshold.
Same here. I did it on my 73 Mustang Mach 1. It had a 351 and instead of running pipes out the back I just removed everything after the headers. At idle in the driveway the car would rattle the windows in the house 😄 This setup didn't last long though. It was just way too loud to be driving around every day.
There is a devise that is used to keep a turbo spooled up by causing the engine to backfire. That backfire which you may have seen is due to an anti lag system or a misfiring system in tuner terms. The anti Lag system keeps the turbo spooled up even when you are not on throttle so that after you exit a corner and step back on the accelerator you have that boost ready for you and hence eliminating turbo lag.
I had an '82 Mustang (4-banger, 88 hp). The first owner modified it by removing the cat. Although it was never dyno'd, it definitely had more HP than what was claimed and the mileage was better (44-45 imperial mpg; 37 US mpg Highway). The downside was that the muffler burned through in 5 yrs.
When I was a kid in the 70's you used to be able to buy Y pipes where you could flip a lever and bypass the whole muffler system. Haven't seen them for years, probably illegal now.
Correction: Scotty Always enjoy your videos. One correction the Saab Sonett and other Saabs of that era have a V4 Ford 4 stroke and a 3Cyl 2 stroke Shrike engine. The 3 Cyl was said to have a lifetime warranty in their sales brochure..
The two stroke Saabs were three cylinders. When they went four stroke then they were buying a V4 Ford engine. I learned to drive in a V4 Saab. My buddy had an older Saab with the two stroke 3 cylinder engine. Clever Swedes had a rack for oil bottles under the driver's seat.
Scotty... you are a pleasure to watch. Typically, everything you say is 100% accurate. You are a great influence on the entire automotive community. You make things easy to understand for the DIY folks, and you help us seasoned technicians figure out some real head scratchers!! Please, keep up the great work. There will always be naysayers about your content... but i say... to hell with em'!! You're AWESOME!! 👍
17:20 according to the words of a former state trooper in the state of Nebraska if you are pulled over for speeding and are found to have nitrous oxide hooked up to your car they will look for any possible excuse to say you were using it because the use of nitrous oxide on public roads is strictly illegal
We have people driving by here that sounds like they have glass packs on their cars. Woah!! When I was divorced a very long time ago, I was left without a dime. The muffler on my car was so bad that it sounded really loud. So, I did what any old poor person would do; I drove over a swale so I could get under the car, and installed a couple of beer cans which worked pretty well for about two weeks. Heck, beer and a new muffler; it was a great day!! 👍
I been watching Scotty for years now.. I have learned enough to finally qualify for Lotus cars employment. Let the haters speak... This Man is a Car Guru.
In about 2004 my dad had a 1990-something Dodge Neon with problems that ended up being a clogged catalytic convertor. Where we lived at the time we weren't subject to emissions testing and I guess it wasn't illegal yet so the mechanic just ripped out the internals of the cat and the car ran great for the rest of the time we had it.
2 strokes need certain back pressure waves as the unburnt gasses are directed back to be burnt. Hence why 2 stroke muffles have to be tuned to the engines.
Even though it's illegal you can always run a straight pipe and cut out the Cadillac converter you might get a few sensors lights but you know what it is
If I remember correctly the catalysts are Platinum, Rhodium, Nickel or something similar. Basically they use the same catalyst as is used in Cat-Cracking Refinery Towers.
Scotty I have come to enjoy your vehicle videos very much! I'm old and a shade tree mechanic since leaning over a fender while standing on a box watching Grandpa work on cars and trucks. Your commentary takes me back! Thank you! Sincerely Scott Newton
I changed the cat assembly on my '00 Jetta three times before i finally figured out it was the ignition coil had a weak fire on cylinder two. Expensive lesson to learn.
I am sure you know why they put expansion chambers on two stroke engines. They used sound to help produce a negative backpressure for more horsepower. And they were tuned to specific rpms.
Hi @Scotty Kilmer, My car is probably not in the "Modern" category 1972 VW Beetle, but it does absolutely need the back pressure. Without it, the engine tends to overheat, especially cylinder #3. It's aircooled, so it probably doesn't fit your case. Great video! I enjoy your content.
I have to chime in right here, I LOVE the lovely P0420 code. NOT to rule out the cat, O2 but I do love telling my customers that it could be something as simple as a vacuum leak.
As a mechanic I've noticed a lot of cars that come in that have nothing but part strong anthem so the number one rule is to find somebody can trouble shoot very good. I remember a car coming in, with a high idle, the poor girl had taken the car to a couple of shops before she brought to me. The first thing I did was look at the engine. I noticed a new TPS sensor installed. I turned the engine off, put my multimeter on the tps sensor. The sensor would only go from 0 to 2.5 ohms. I removed the sensor and tested the sensor. The sensor off the car went from 0 to 5 ohms. Which means the sensor is good. Then I checked the actuator on the. It moved smoothly. So as I was installing the tops sensor, I made sure I installed the Tps at the half way point on the car. After installing the tps sensor on the car. As I moved the tps from close to open, I saw 0 to 5 ohms on my meter. I plugged the sensor back in, started the car. When the computer went to close loop, the engine dropped down and was purring like a kitty. Even though the car had a check engine light on, I never plugged my scan tool in. But when I looked at the dash, the check engine light was off. I did a scan, just like I figured, no codes. Still checked the engine out. Compress test, vacuum check, pressure coolant check. Engine was sound. Our shop did not do transmissions. After the road test, the paperwork taking care of, the happy smile on her face was priceless and I even got a hug. So take your time and learn how to troubleshoot.
Most of the big trucks the younger guys drive where I live in Georgia sound like piston driven airplanes, and most of them are tuned to perform just fine without backfiring. They are extremely loud, but they seem to run just fine. My truck has a less restrictive custom cat-back that performs & sounds very good without being loud. All 4 factory cats are in place, and I do have an adaptive tune so it doesn't backfire.
2:24 I've heard that before and it means that Police can make up whatever they want. And if they don't like you and you're not a bootlicker or a fellow officer. That means you're more likely getting a ticket.
Yep. Had a buddy get a ticket for a noise violation on a truck he had with a cat back exhaust system. Cop was just being a jerk. “Excessive” is unquantifiable, entirely opinion, and shouldn’t be permissible in a law you expect someone to comply with. He took it to court with proof the system was “50 state legal” and the ticket got thrown out.
I have a number of twin cylinder and single cylinder motorcycles. They all go way better with ‘unrestrictive’ mufflers. And pod filters on the upjetted carburettors.
Been watching Scotty for years I'm so glad that he's doing so well on TH-cam but I got to say he sounds a little Sauced up in this one, which makes it all the better
Honestly Scotty, I used to hate your content. I admit I was wrong. You make amazing content and you have shown me things that I wouldn’t have realized. Thank you, you really have helped me be a better shade tree mechanic and a better tech student.
The computer codes said the left bank was running lean in my car and suggested replacing the oxygen sensors, but my trusted mechanic found that a valve in the exhaust manifold was missing and the air rushing through at full force blew the gasket. Such a shame I had not seen your TH-cam channel before I bought my 2014 Cruze. Of course Chevy invited me to go to a dealership to have the problem fixed for free AFTER I had spent the $800. And its fix was only for the PCV valve issue itself and probably didn't include the gasket replacement...
day 1 of understanding how things work, its all just knoledge and results down to the basics then you make a diagnosis, then operate and see if the operation worked from..results. the start of a mechanics life is based from newtons laws then build knoledge up from hydrodynamics and thermodynamics, throttled by how the components works and then how it works with its mates...the other components... knowledge is is the hard part, taking the car apart and putting it back together is the easy part
Your a great mechanic I have became a pro mechanic listening to you. Thank you for all of your videos Scotty wish I could come to Texas and meet you in person one day.
Scotty, been watching for years and just had this issue come up. Wife's 95k miles 2011 Chevy Equinox check engine light comes on for the catalytic converter efficiency, but only after it rains. Usually lasts until a couple tanks of gas go through. What gives? I'll give the lacquer thinner a try.
I get about 35 more BHP by de-catting my flat-four, turbocharged '97 Tommy kaira M20b, along with replacing the downpipe with a wide-mouthed 4" custom item. The high-flow JASMA-approved 3" stainless Fujtisubo cat-back did not need replacing. But the best mod I ever did to it was adding a Cusco brake master cylinder brace: With the 12-pot Brembo system it made the brake pedal solid as a rock - just like my Porsches. :)
Had a 96 Lexus LS400, I lost both mufflers over some train tracks because it was on air suspension and it went out, anyway that thing was so loud. My neighbors hated me for it i woke up everyone bright and early 😂 they were so thankful when I got a little corolla.
Well scotty youre not always right. Just to catch you up todays car scene. People are making their car "backfire" its call "pops N Bangs tune". The engines are tuned good. They just tune in it to pop and bang. Basically dumping gas in the exhaust and then igniting it for bangs. Ive seen cars run 7 seconds in the 1/4 mile with pops anf bangs tune so nobody say well if its backfiring its not running right. Well if running a 4 cyl minivan with turboed k24 motor down the quarter mile track in 7 seconds then ill take "not running right" lol
Unburned gasoline that explodes in the exhaust system can damage the muffler and catalytic. Muffler can burst at the seams, Catalytic can burst, or core can be damaged. Rusty pipes that would otherwise last a while longer can burst. Why anyone would intentionally risk this makes no sense. If you have backfire, the cause should be found and resolved. I had a new muffler burst due to exhaust explosion. Even under adverse conditions in which older engines would tend to backfire, modern engines are less likely to do this. They have knock sensors that sense knock or back fire. They retard the spark timing to prevent the knocking. But you will not know that this is happening, except performance and fuel economy could be reduced. A fancy OBD scanner that shows live codes might tell you if spark time is being retarded.
I had a issue with the catalytic converter on my 2008 dodge ram 1500 at about 200,000 miles. I replaced it with a section of straight pipe, it works great. I do not have emissions tests where I live.
My first car with the muffler behind the rear tires like that never lasted long. One rusted away but it was welded on so the inside part was still there. Think I out the muffler on backwards so it would fit over the old insides still there. Worked great and the quietest that car has ever been. Once that muffler was going bad though I took it someplace to get changed. They told me that they had to cut it off as there was an adapter welded on. Adapter? Ha it was just part of the previous muffler.
Good info as always Scotty, but I wanna know if there is a way to reprogram the injectors on my 2016 Frontier SV ? It's 310hp mpg is crap, would it be possible to knock it down to say 250 or less & up the mpg ? Thanx.
No.... your mpg is crap because the car wasn't built with an aerodynamic body and has a high coefficient of drag in the body design. It just doesn't push air out of the way very well at highway speeds.
Read a story while back that several car renting businesses in the EU found increasing numbers of cars coming back without the converter. Sometimes we even have crime waves for specific things; Airbags like 5 years back, converters was the big thing 2 years back
I had car in Ontario, Canada, many years ago that was modified to use pure natural gas. So the fuel was totally ionized, yet the catalytic converter became clogged, and it wouldn't go more than 35 mph. A mechanic removed the innards and it ran good. I guess that it was legal, but now in retrospect I am unsure if it was.
not sure how many years are many, but as of 20 years ago it would be illegal (though hollowing out a cat is a common practice). That is probably why the mechanic hollowed it out, rather then straight pipe it. A CNG engine is technically a low emission engine anyway, which is why you were probably able to get away with it.
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😃😃
Hello Mr Scotty. So many words with pics you have said in the past got me in tears sometimes till today😭👍. One example was when you said the undercarriage was "rock hard" with a viagra sign😭😭💀
CC's can be Cleaned. Its not recommeded to do it more than once though.
Those high performance cars backfire during rev deceleration because they're designed to do so. Some of them seem to be doing it just for fun, but the more serious high performance cars do it because fuel is being dumped in order to cool the valves and and that fuel then ignites in the exhaust. Have you never heard of this? If you still think it doesn't make sense, what better method do you propose for keeping valves cool (these cars also often have titanium intake and sodium filled exhaust valves)?
1a
Illegal ways to make your car faster:
1. No muffler’s (causes backfire if not tuned)
2. No catalytic converters (fails emissions test)
3. Nitrous Oxide (can blow up engines, legal in some states only)
4. Bigger fuel injectors (ecu tuning a must)
Thank you Scotty for all the info you give us. I especially loved this one lol 🙏
Must suck to need emmisions test
@@gpenn7201 only states like California are strict on emissions. Most don’t care.
It especially sucks when they are intentionally done in the most backward, counterproductive and mechanically illiterate way possible. It's done by emission per gallon of fuel. I guarantee my car is cleaner, burning 1/3 the fuel per mile than stock if emission tests were done by sane people.
@@spidergoose891 Go on...
@@Febreeze_Odor_Eliminator other states are joining in. the whole west coast and east coast have the same restrictions. washington, oregon, california, new york, vermont, massachusetts, etc. all have sections of the state that follow california CARB law. the difference is those laws tend to be in the more populated areas (in oregon it only applies to the portland metro area for example) while cali has it for the whole state. but if you live in any of those big cities you need to do tests and it gets pretty sketchy as a car tuner
It’s a shame that there are so many crooked mechanics out there but when you see one honest like this guy i rather spend my hard earn money on this guy or any honest mechanic. They deserve the work.
P0
When I lived in TX I was considering making the 1.5 Hr drive to drop my truck off at his shop. Problem was I probably wouldn't have made it there lol.
Lol 😂
its a shame there are so many crooked lawyers , cops, judges, doctors, bankers, businessman..... its a LONG LIST momma
@@ccole9080 daddy?
"Never assume there is only one problem" is some of the best car advice one can get, especially for a DIY mechanic learning to work on their own rides. A lot of people work on their own cars to save time and/or money, but if youre not careful and thorough, you'll lose a lot of both. One thing my dad taught me as a kid "before you start trying to fix your own car, get a bus pass and make sure your bicycle is in good shape". We laughed, but its so true
Scotty is one of the most honest mechanics I’ve ever heard… My mechanic is a great guy as well. Keep up the awesome job.👏
If it is against federal law to remove a catalytic converter from a car, then why aren't car thieves charged with a federal crime? That would put such thieves in jail for longer and less cats would be stolen and the air would be cleaner. Win, win for everyone.
The cat doesn’t really clean anything now days with the current gasoline. Many states are legalizing to remove it
The government doesn't care about you nor the criminals ruining our way of life
People selling Cats here now required to show proof of ownership.
The thrives may cross state lines. Grrr.
@@BEINGOOD77 lol my state doesn’t care, u can sell all you want. The catch is that they save your photo ID for future reference
@@John-zp2jm The drivers who still have them on there cars could take extra steps to deter theft.
I suspect a lot of them " stolen" are insurance scams.
Same as stuff stolen from your car, when Christmas shopping.
This guy gets a cardio workout every time he tells a story 🙂
Spellcheck
Don't you mean everytime?
He has so much energy in his voice.
He would've made an excellent silent film star where physical expression was everything.
13:25 he even works up a sweat!!
Scotty is such an outlaw he's been known to fearlessly tear those " Do Not Remove This Tag Under Penalty of Law" from all his couch cushions. 👍
That tag is only meant for the store selling the product but I feel you tho
@@angelcruz0143 think it's a joke but I remember being 6 and reading that and being like I hate the tag stupid law 😆
Scotty brave
Yeah I wonder how many tags that are still on the furniture that everyone owns? 73
He removed them from the cat pillows too…
The "don't need back pressure" thing is especially true for turbocharged cars. You want as little restriction as possible after the turbine, otherwise the pressure will actually hurt the spooling characteristics of the turbocharger. It's why on big turbo cars, you see the catalytic converter either: replaced with a high flow racing cat, removed, or moved farther down stream to reduce restriction and improve turbo spooling. Even a small size upgrade, changing to a lower restriction exhaust has improved responsiveness due to letting that turbo spool more rapidly.
Agreed, just bought an X5 M twin turbo V-8 all tricked out for the track. It has after market straight pipes that are 1.5" larger than the stock 'M racing package' that came on it. All the UPGRADES took it from a 600hp family race car to over 800hp. Cost $1800 / year in tires driving it under "normal" traffic conditions. 🤣
Back pressure may be a thing for low powered vehicles which would make a little more sense…
wouldn't a blow off valve help as an alternative to the muffler change?
@@LynchMob09R no, since the blow off's function is just to prevent pressure buildup in the intake to either keep the turbine spinning after you let go of the gas pedal and close the throttle valve, or limit the maximum pressure to keep your engine in 1 piece. Back pressure in the muffler will have an effect on how much the turbine can spin or keep spinning since the exhaust pressure and flow is the active force that makes the turbine spin.
13:33
Even if ya don't give a crap about mechanics, Scotty is fun to watch! Congrats on the 5 million subs Scotty.
I never buy new vehicles so I have to care. :)
I was over the video due to the over talking but stayed because it grew on me 😂
I was over the video due to the over talking but stayed because it grew on me 😂 😊
@@Sir_Richard_Crainum_lll he’s fun to watch if you love information
Agree
I had the def system removed from my diesel truck. It operates cooler, cleaner, and improved fuel mileage by 15%
Yeah, those are pretty awful. Bypasses are big for individuals. Parts are expensive for fleets that are legally inspected.
Also will save you trips to the mechanic shop.
def system meaning?
@@exzzistfym DEF - Diesel exhaust fluid. DEF is 30% urea, 70% water and is injected into the exhaust gases of diesel engines just before the catalytic converter. It aids the catalytic converter in converting NOx's (pollution) back into nitrogen (N2) and water.
Careful
When I lived in California back in the 80's, I inherited a 6 cyl. Ford Granada. Just like Scotty described, the time came when I couldn't get over 35 or 40 mph. My mechanic friend 'fixed' the problem by simply removing the honeycomb from inside the CAT with a pair of pliers. The car passed the smog test every time.
I did that on a civic and blew the engine.
@@jayalli707 auto mechanics 101 tells me that it was coincidental that you blew up the engine by removing the restriction in the cat. I filled up at Shell one day instead and Chevron and the next day a ball joint let go on the right front wheel.
@@andrewwasson6153 ha! NEVER cheat on your gas station.
The old tymers swear by taking out the cat. I've always had hard luck with it, all those one times.
On any older car I've owned, we've gutted the cat- it becomes a necessity
@@jayalli707 causation vs. correlation
It’s only illegal if you get caught
Is that a trump defense?
Amen brother
@@johac7637 he hasn't been a president for 2 years bro, it time to let it go. He's living rent free in your head.
Haha eyyyyy
Hell yeaaa🤘🏼
A lot of "high performance" mufflers are designed to have higher flow rates to reduce the negative effects a muffler has on your car. The downside is that they won't be as quiet as a typical muffler and most are dramatically more expensive than typical mufflers. But sometimes halfway is the best you can legally get.
Magna Flow muffs are excellent. Straight thruogh perforated tube with a non-deteriorating sound absorbtion material. No drone & minimally increase exhaust volume. I've run them for 30 years. ALL mufflers with baffles, even "high performance" versions are detrimental to performance. It's called "fluid dynamics" & a common example are rocks in a stream. Every rock disrupts smooth flow & the same thing happens in an exhaust. The newer cats are very minimally restrictive.
I see Sylvester in the background, 7:13 - the true master mechanic behind the scenes!!!
If the video was on mute and you play the video to an orchestra they could possibly play a melody following Scotty's arm movements
😂😂😂😂
He was reincarnated from a band director
I'm surprised he hasn't flown away yet
😂😂😂
Loooooolllll thats funny
I wish I had an mechanic like this guy!
My wife backfires. I feel shell-shocked consistently.
Lmao
🤣🤣🤣🤣😂😂😂😂
😂🤣
Got to put a muffler on her!
Any mods for this? Lemme know straight away
I can attest to your catalytic converter solution!!! My van's converter was jingling for a few months; not too bad but getting worse. I used the laquer thinner on half a tank of gas. After a few hours driving, I never heard that sound again; that was 7 yrs ago. (that was awesome also!! thanks so much Scotty)
When I first bought my 2003 Nissan Xterra 4x4 it had engine check light on. That is what my mechanic had said "you need catalytic converter". This vehicle catalytic converter cost a lot for OEM ones. I just drove it like that for a few years and now it had passed smog check. I had used the thinner Scotty had recommended when I first got my car, but it didn't work at the time. So l do the European cleaning😁 Scotty had recommended. Went for a long trips going around 70mph that seems to help. Now no more engine check light and passed smog in 2021. Yay!😅
Where the fugg can I get a thinner Scotty for my Impreza?
Hey Scotty, you're usually 100% spot on. BUT......there are engine tuners who can alter the Engine Control Module (ECM) that can tune your car to BETTER gas mileage, go from 1 7/8" to 3 1/2" exhaust (for turbos) and make it run faster & better. I've had a Miata that I added a 2.5 Liter Ford Focus engine, a turbo, and big 3" stainless steel exhaust & muffler. It was a BLAST to drive!
I bet that Miata screamed!!! Power to weight ratio 🤟😵💫🤟
I love seeing Scotty Kilmer’s Cat during the Cat-alytic Converter Episode.
I wonder what it would sound like if Scotty directed the Philadelphia Orchestra with his normal car video hand movements?
It may be a big hit, lol. I like Scotty.
Ohh boy 🤣
It would sound just like a toyota
@@Jackman8594 Lmaoo
he does that on Tuedays after happy hour and a dozen chicken wings and a sheet pizza or 2
😂😅
I sure enjoy learning about different parts of automobiles. Your videos are real gems to enjoy!
Thank you very much Scotty ..
Keep up the good work!
His content truly is great.
I'm a 20+ year automotive technician, and I still love to watch his videos. I already know what's going to come out of his mouth before he says it... but he's just a pleasure to listen to, so i watch anyway! 😂
I want to download this guys knowledge about cars into my head. Holy crap.
Love all of your posts. In technical terms Engine Engineers use. Backfire is when an engine fires Back through the intake. Afterfire is when an engine fires after the exhaust.
Thank you for that explanation about back pressure. I can’t stand it when I get on forums trying to research a certain mod for my 392 challenger and I constantly see guys scared to do certain mods because “it’ll reduce the back pressure.” The only engine to my knowledge that needs back pressure is a diesel motor.
The only time back pressure is a hindrance is if you run your engine at full throttle, all the time. That's hardly the case in a car on the street used for transportation. You're lucky if you use 10 to 15 HP going down the freeway on a clean aerodynamic car on level ground. That's nothing when the engine can make 300 -600 hp. Even Turbochargers make a lot of back pressure, by a factor of 3:1 on the turbine side vs the compressor side. So if you're making 25# of boost on the compressor side of a turbo diesel, there's about 75# of back pressure on the turbine exhaust side. Can't get one without the other. Don't say it's bad, lots of vehicles run turbochargers and run full throttle applications, and the back pressure on the exhaust does no harm.
My lawn mower needs back pressure
Diesels don't need back pressure. No engine performs better wiith back pressure. 2 strokes need a tuned exhaust but it's not to create back pressure.
Minor correction: the SAAB Sonett had either a three-cylinder two-stroke engine, or a V4, four-stroke engine sourced from Ford. A long time ago I really wanted a two-stroke Sonett but I never saw one. I did have a '67 SAAB 96 Monte Carlo, and that model's high-performance two-stroke engine (60 HP!) had three carburetors (the highest carburetor-to-cylinder ratio of any car I ever owned). I don't know if the two-stroke Sonett came with the triple-carb engine, but as it was a sports car my guess is that it did.
I believe the V4 was shared with Ford, I had one in my Corsair
Yes, the V4 used in late 60s to mid 70s SAABs, was a German Ford engine built in Cologne and introduced in 1962, and powered the Ford Taunus.
I learned to drive in my dad's 68 SAAB 96. He had been interested in the Sonett II which were all 3 cylinder 2 strokes. But he was too tall to sit in it.
His two previous cars, a Lloyd (British) and a DKW (German, one of the 4 companies that merged to eventually form Audi, hence 4 interlocking ring logo) were both 2 stroke, fwd. The 68 SAAB 96 was available with either the 3 cylinder 2 stroke or the V4 4 stroke. He opted for the larger displacement V4.
Btw the Sonett pic Scottie showed was of a Sonett III, which were all V4 4 strokes
I have a V4 sonett, love it
Yes the early sonnets had Monte Carlo motors
@@stevewales9911 The Lloyd was a 4 cycle, 2cylinder,made by the Borgward company,in Germany .I have two now,and have had more previously
Back in 88 I took the mufflers off my 86 Mustang 302. The straight pipes worked great, and the sound was awesome. Luckily for me at that time, in New Hampshire, the cat kept the noise down to just below the legal threshold.
I did the same thing with my V6 89 T-bird. Passed smog, sounded great, improved power & mpg
Same here. I did it on my 73 Mustang Mach 1. It had a 351 and instead of running pipes out the back I just removed everything after the headers. At idle in the driveway the car would rattle the windows in the house 😄
This setup didn't last long though. It was just way too loud to be driving around every day.
@@dyingbreed5386 Nice. Of course you did not have the ridiculous cats on it. Kept mine quiet enough unless I got on it.
There is a devise that is used to keep a turbo spooled up by causing the engine to backfire. That backfire which you may have seen is due to an anti lag system or a misfiring system in tuner terms. The anti Lag system keeps the turbo spooled up even when you are not on throttle so that after you exit a corner and step back on the accelerator you have that boost ready for you and hence eliminating turbo lag.
That's a myth. It does nothing to reduce lag. It's a dipshit's idea of cool.
I was an auto mechanic for 40 years and I still enjoy Scotty's videos
I had an '82 Mustang (4-banger, 88 hp). The first owner modified it by removing the cat. Although it was never dyno'd, it definitely had more HP than what was claimed and the mileage was better (44-45 imperial mpg; 37 US mpg Highway). The downside was that the muffler burned through in 5 yrs.
Mufflers are cheap.
When I was a kid in the 70's you used to be able to buy Y pipes where you could flip a lever and bypass the whole muffler system. Haven't seen them for years, probably illegal now.
I plan on doing that to my car. I want to be loud but only sometimes
I saw that recently on Gears
You can get electric ones from jegs.
Electric cut outs
Summit Racing has them for $199
Correction:
Scotty Always enjoy your videos. One correction the Saab Sonett and other Saabs of that era have a V4 Ford 4 stroke and a 3Cyl 2 stroke Shrike engine. The 3 Cyl was said to have a lifetime warranty in their sales brochure..
A 20min video about catalytic converters when I had no business learning about this stuff. Scotty Kilmer's things.
This is our mechanic dad that we all needed
I took my catalytic converter off and chisel out the inside and put it back on and it ran great
Did it get loud, or relatively similar sound? Also did you have any codes pop up after?
@@jamesb7656 ran just fine. No funny noise and no check engine light
@@davesphilippinedaydream2656unfortunately some of us live in California and cannot get away with that
The two stroke Saabs were three cylinders. When they went four stroke then they were buying a V4 Ford engine. I learned to drive in a V4 Saab. My buddy had an older Saab with the two stroke 3 cylinder engine. Clever Swedes had a rack for oil bottles under the driver's seat.
Scotty is a cool dude. Feel like I get a work out every time I watch him its great. 😊
Scotty... you are a pleasure to watch. Typically, everything you say is 100% accurate. You are a great influence on the entire automotive community. You make things easy to understand for the DIY folks, and you help us seasoned technicians figure out some real head scratchers!!
Please, keep up the great work. There will always be naysayers about your content... but i say... to hell with em'!! You're AWESOME!! 👍
My converters lasted the warranty then I lost them in a tragic boating accident at the scrapyard where I found 180$ on the ground lol
Houston Scotty is my favorite Scotty
17:20 according to the words of a former state trooper in the state of Nebraska if you are pulled over for speeding and are found to have nitrous oxide hooked up to your car they will look for any possible excuse to say you were using it because the use of nitrous oxide on public roads is strictly illegal
We have people driving by here that sounds like they have glass packs on their cars. Woah!!
When I was divorced a very long time ago, I was left without a dime. The muffler on my car was so bad that it sounded really loud. So, I did what any old poor person would do; I drove over a swale so I could get under the car, and installed a couple of beer cans which worked pretty well for about two weeks. Heck, beer and a new muffler; it was a great day!! 👍
I did the exact same thing with coffee cans!!!!
Soup cans!!!haha
Haha! That’s actually awesome. Clever
I been watching Scotty for years now..
I have learned enough to finally qualify for Lotus cars employment.
Let the haters speak...
This Man is a Car Guru.
In about 2004 my dad had a 1990-something Dodge Neon with problems that ended up being a clogged catalytic convertor. Where we lived at the time we weren't subject to emissions testing and I guess it wasn't illegal yet so the mechanic just ripped out the internals of the cat and the car ran great for the rest of the time we had it.
It's been illegal to remove them since they started installing them
@@jessejames96
When did Jesse James puss out?
Be an Outlaw.
Rip out the insides of your cat.
2 strokes need certain back pressure waves as the unburnt gasses are directed back to be burnt. Hence why 2 stroke muffles have to be tuned to the engines.
Even though it's illegal you can always run a straight pipe and cut out the Cadillac converter you might get a few sensors lights but you know what it is
If I remember correctly the catalysts are Platinum, Rhodium, Nickel or something similar.
Basically they use the same catalyst as is used in Cat-Cracking Refinery Towers.
Scotty I have come to enjoy your vehicle videos very much! I'm old and a shade tree mechanic since leaning over a fender while standing on a box watching Grandpa work on cars and trucks. Your commentary takes me back! Thank you! Sincerely Scott Newton
Good to hear sir, keep on trucking!
I changed the cat assembly on my '00 Jetta three times before i finally figured out it was the ignition coil had a weak fire on cylinder two. Expensive lesson to learn.
"The Rattling Converters" is a good name for a band.
Fleetwood Mac Sex Pants! I called it.
I am sure you know why they put expansion chambers on two stroke engines. They used sound to help produce a negative backpressure for more horsepower. And they were tuned to specific rpms.
The thumbnail shows a MAF...then never mentions the MAF.
Whatever Scotty takes before his videos , I need it.
High test coffee.
The V4 was a four stroke English Ford engine. It replaced the 2-stroke, 3-cylinder Saab engine in 1967.
I was under the impression that the V4 on the Saab was a German Ford taunus engine
What's a good informative video on catalytic converters without cats just doing their thing in the background. Love it.
Hi @Scotty Kilmer, My car is probably not in the "Modern" category 1972 VW Beetle, but it does absolutely need the back pressure. Without it, the engine tends to overheat, especially cylinder #3. It's aircooled, so it probably doesn't fit your case. Great video! I enjoy your content.
They have "dog house" fan shrouds, that relocate the oil cooler, so #3 doesn't run hot.
I love how Scotty is just like “here, this will make your car faster, but it’s illegal, but it will make your car faster”
I have to chime in right here, I LOVE the lovely P0420 code. NOT to rule out the cat, O2 but I do love telling my customers that it could be something as simple as a vacuum leak.
Scotty on the run🏃
Bro! 🤫😆🤣🤣
As a mechanic I've noticed a lot of cars that come in that have nothing but part strong anthem so the number one rule is to find somebody can trouble shoot very good. I remember a car coming in, with a high idle, the poor girl had taken the car to a couple of shops before she brought to me. The first thing I did was look at the engine. I noticed a new TPS sensor installed. I turned the engine off, put my multimeter on the tps sensor. The sensor would only go from 0 to 2.5 ohms. I removed the sensor and tested the sensor. The sensor off the car went from 0 to 5 ohms. Which means the sensor is good. Then I checked the actuator on the. It moved smoothly. So as I was installing the tops sensor, I made sure I installed the Tps at the half way point on the car. After installing the tps sensor on the car. As I moved the tps from close to open, I saw 0 to 5 ohms on my meter. I plugged the sensor back in, started the car. When the computer went to close loop, the engine dropped down and was purring like a kitty. Even though the car had a check engine light on, I never plugged my scan tool in. But when I looked at the dash, the check engine light was off. I did a scan, just like I figured, no codes. Still checked the engine out. Compress test, vacuum check, pressure coolant check. Engine was sound. Our shop did not do transmissions. After the road test, the paperwork taking care of, the happy smile on her face was priceless and I even got a hug. So take your time and learn how to troubleshoot.
Scott Kilmer... A well-informed gentleman... A tip of the cap to you, sir...
Most of the big trucks the younger guys drive where I live in Georgia sound like piston driven airplanes, and most of them are tuned to perform just fine without backfiring. They are extremely loud, but they seem to run just fine. My truck has a less restrictive custom cat-back that performs & sounds very good without being loud. All 4 factory cats are in place, and I do have an adaptive tune so it doesn't backfire.
People: My lord, is that legal?
Scotty: I'll make it legal
2:24 I've heard that before and it means that Police can make up whatever they want. And if they don't like you and you're not a bootlicker or a fellow officer. That means you're more likely getting a ticket.
Yep.
Had a buddy get a ticket for a noise violation on a truck he had with a cat back exhaust system. Cop was just being a jerk. “Excessive” is unquantifiable, entirely opinion, and shouldn’t be permissible in a law you expect someone to comply with.
He took it to court with proof the system was “50 state legal” and the ticket got thrown out.
I have a number of twin cylinder and single cylinder motorcycles. They all go way better with ‘unrestrictive’ mufflers. And pod filters on the upjetted carburettors.
Been watching Scotty for years I'm so glad that he's doing so well on TH-cam but I got to say he sounds a little Sauced up in this one, which makes it all the better
Honestly Scotty, I used to hate your content. I admit I was wrong. You make amazing content and you have shown me things that I wouldn’t have realized. Thank you, you really have helped me be a better shade tree mechanic and a better tech student.
The computer codes said the left bank was running lean in my car and suggested replacing the oxygen sensors, but my trusted mechanic found that a valve in the exhaust manifold was missing and the air rushing through at full force blew the gasket. Such a shame I had not seen your TH-cam channel before I bought my 2014 Cruze. Of course Chevy invited me to go to a dealership to have the problem fixed for free AFTER I had spent the $800. And its fix was only for the PCV valve issue itself and probably didn't include the gasket replacement...
The diesel Cruze has a regeneration feature . Interesting procedure.
Thank you. I love how you explain things auto, very simply. Just at my level of understanding.
day 1 of understanding how things work, its all just knoledge and results down to the basics then you make a diagnosis, then operate and see if the operation worked from..results.
the start of a mechanics life is based from newtons laws then build knoledge up from hydrodynamics and thermodynamics, throttled by how the components works and then how it works with its mates...the other components...
knowledge is is the hard part, taking the car apart and putting it back together is the easy part
The Saab Sonett was NOT a V4 two stroke. It first had an I3 two stroke and later a V4 four stroke (from Ford in Germany). So Scotty, now you know. 😏
Scotty Kilmer is very honest and knowledgeable 👍🏼
Your a great mechanic I have became a pro mechanic listening to you. Thank you for all of your videos Scotty wish I could come to Texas and meet you in person one day.
Scotty, been watching for years and just had this issue come up. Wife's 95k miles 2011 Chevy Equinox check engine light comes on for the catalytic converter efficiency, but only after it rains. Usually lasts until a couple tanks of gas go through. What gives? I'll give the lacquer thinner a try.
I actually have the exact can of lacquer thinner sitting at my airbrush paint desk.
Update: Did not work. YMMV.
Sell it. You barely have any miles and this is already happening... Shows the quality
Manual transmission will indeed help to save on gas. So lovely.
no...no it wont.
auto coupled with a tuned computer/engines smashes manuals. please research before ya post
1:08 was that Barry bee I just heard
"Yuppified". What a real man. Love it
I get about 35 more BHP by de-catting my flat-four, turbocharged '97 Tommy kaira M20b, along with replacing the downpipe with a wide-mouthed 4" custom item. The high-flow JASMA-approved 3" stainless Fujtisubo cat-back did not need replacing.
But the best mod I ever did to it was adding a Cusco brake master cylinder brace: With the 12-pot Brembo system it made the brake pedal solid as a rock - just like my Porsches. :)
Always entertaining, always knowledgeable, it's hard not to love Scotty. Thanks for making us laugh, man, and happy new year. And lmao, "yuppified."
Scotty is good people
In the great state of North Dakota, "mufflers are required on all vehicles" to prevent noise and air pollution. No wiggle room.
Doesnt say what kind or style, get a glasspack 😁
Common sense stuff
Didn't know muffler reduces air pollution!
I don't know why this is so entertaining but I do know this guy rules!
Such a wealth of information from you Scotty, always appreciated
"Deci bells", honk like a goose, and the duct tape tire all got me tickled.😂
Had a 96 Lexus LS400, I lost both mufflers over some train tracks because it was on air suspension and it went out, anyway that thing was so loud. My neighbors hated me for it i woke up everyone bright and early 😂 they were so thankful when I got a little corolla.
Vrroom vroom!
Well scotty youre not always right. Just to catch you up todays car scene. People are making their car "backfire" its call "pops N Bangs tune". The engines are tuned good. They just tune in it to pop and bang. Basically dumping gas in the exhaust and then igniting it for bangs. Ive seen cars run 7 seconds in the 1/4 mile with pops anf bangs tune so nobody say well if its backfiring its not running right. Well if running a 4 cyl minivan with turboed k24 motor down the quarter mile track in 7 seconds then ill take "not running right" lol
Right. And it's not backfire. It's afterfire. Backfire is blowing back out the intake. Scotty.... Tsk tsk.
Unburned gasoline that explodes in the exhaust system can damage the muffler and catalytic. Muffler can burst at the seams, Catalytic can burst, or core can be damaged. Rusty pipes that would otherwise last a while longer can burst. Why anyone would intentionally risk this makes no sense. If you have backfire, the cause should be found and resolved. I had a new muffler burst due to exhaust explosion.
Even under adverse conditions in which older engines would tend to backfire, modern engines are less likely to do this. They have knock sensors that sense knock or back fire. They retard the spark timing to prevent the knocking. But you will not know that this is happening, except performance and fuel economy could be reduced. A fancy OBD scanner that shows live codes might tell you if spark time is being retarded.
God blessed you scotty!!
Scotty, you're a rock star. Apart from the vids taking the piss out of Numpty Trumpty, your contributions are my favourite 👍
I had a issue with the catalytic converter on my 2008 dodge ram 1500 at about 200,000 miles. I replaced it with a section of straight pipe, it works great. I do not have emissions tests where I live.
Somebody tried to steal the catalytic converter from my 2001 Suzuki Tracker.
They took the resonator 🤣
He will probably come back once he comes back from the scrapyard and realizes he screwed up .
Thieves suck .
@@jayhockley8841 it didn't happen in my neighborhood, so I think the risk of that happening is low.
The stupidest thing I see lately here in the UK is people getting their ECU’s remapped to actually get the car to pop and bang 🤦♂️
There is someone who goes down the street I live in doing that late at night. All you hear is the banging / popping noise. Not cool !
Pop tunes are common in the US too.
My first car with the muffler behind the rear tires like that never lasted long. One rusted away but it was welded on so the inside part was still there. Think I out the muffler on backwards so it would fit over the old insides still there. Worked great and the quietest that car has ever been. Once that muffler was going bad though I took it someplace to get changed. They told me that they had to cut it off as there was an adapter welded on. Adapter? Ha it was just part of the previous muffler.
Love him he helps all to really get two or more estimates man with best knowledge
Dude casually talking science about mufflers and Motors like it's nothing. Talks alot like Lewis Black-with his hands.
Love this guy!
Good info as always Scotty, but I wanna know if there is a way to reprogram the injectors on my 2016 Frontier SV ? It's 310hp mpg is crap, would it be possible to knock it down to say 250 or less & up the mpg ? Thanx.
No.... your mpg is crap because the car wasn't built with an aerodynamic body and has a high coefficient of drag in the body design. It just doesn't push air out of the way very well at highway speeds.
Hello Scotty from Mooresville NC USA
I love this guy’s personality, 😂😂he’s a bloody legend
Read a story while back that several car renting businesses in the EU found increasing numbers of cars coming back without the converter.
Sometimes we even have crime waves for specific things; Airbags like 5 years back, converters was the big thing 2 years back
Never thought in 3 mins time I’d find my favorite dude on TH-cam for a array of reasons.
I had car in Ontario, Canada, many years ago that was modified to use pure natural gas. So the fuel was totally ionized, yet the catalytic converter became clogged, and it wouldn't go more than 35 mph. A mechanic removed the innards and it ran good. I guess that it was legal, but now in retrospect I am unsure if it was.
That's weird, CNG converted cars are fairly common here and none of them have cat issues.
not sure how many years are many, but as of 20 years ago it would be illegal (though hollowing out a cat is a common practice). That is probably why the mechanic hollowed it out, rather then straight pipe it. A CNG engine is technically a low emission engine anyway, which is why you were probably able to get away with it.