I love how Honda can take a seemingly complex idea and make it simple. The first time my dad explained this to me it seemed complicated, but after seeing this its not that complicated at all.
Watched Ed on "Wheeler Dealers" do a fix-up on one of these engines. He described everything and how it worked as he fixed the issues. Was awesome, and yes, one of the beautiful things about this system is that it is not all that complicated. Ed had it fixed and runnin' in a jiffy.
At a certain RPM the rocker arms lock up together allowing the Blue center cam (which is usually raised above the cam) to lift the rocker arms higher, opening up the valves longer.
ECU opens a solenoid to allow oil to flow into the cavity. The ECU uses (I think) input from either cam/crank angle sensor to determine RPM, unless there is a dedicated sensor
@smouldering Yes I do work for Honda. And yes most versions of vtec have a preset for the engagement. For example, if you're driving a car with vtec and its a manual and you are climbing a steep hill if you are in second gear and you get the rpm up to the engagement point it will engage vtec because it feels that load regardless if it's a full trottle or not but if you where in fifth gear the car is going to feel the load but not engage the vtec because it's not hittings it's preset point.
I think that torque is created by the size of engine itself, but can't say, because V8 is quite rare here. Inline-4 is far the most common type. Me and my friend, who repairs/tunes cars, were talking about performance tuning. I mentioned, that maybe a cam with higher lift could be good. He answered me: "Well, you'll get power, but it's bye-bye low-end torque then."
I always bashed civics or any kind of japanese import for that matter without even stepping foot inside one. My friend got a civic si and when that vtec kicked in it brought such a smile to my face. I fet like a plane speeding down a runway and finally getting wheels off the ground.
@redsoxfever100 smouldering is wrong...there is a fixed rpm range that vtec is activated, it just depends on the model that you have. Yes it takes a certain parameters to be met until vtec is activated but it does not change when the vtec is actually activated, unless you have vtec controller or aftermarket ecu then you can decide at what rpm to activate it.
The reason big two valve V8s have that lope is because part of the unburned intake charge is being pushed out of the exhaust valve at the beginning of the intake stroke. This is due to high cam overlap and causes the cylinders to fire unevenly (some cylinders are getting more of the intake charge than others). The reason for the high overlap is because cams are tuned for high rpm power, at the expense of low rpm power and driveablity. Toda VTEC killers give Honda engines the same loping idle.
you have a point but it was a very good idea because, around town driving you want good low to mid range power, and you want good power on high rpm's vtec allows you to have both instead of giving up one or the other...
It's not lag. It is a pro, that it doesn't open up before higher revs. As I think, is that a lower valve lifting will create more torque, and torque is needed to get the car moving? And when it reaches higher revs, then the lift is changed to higher, giving extra power, which is more useful than torque at that point.
@smouldering Yes that is correct but where u are wrong is that the vtec engagement is already preset. It's just if those inputs to the ecu are telling it to engage vtec or not. And that is from OUR HONDA R&D department. Not wiki I can go there and modify what it says.
VTEC varies lift between two settings. There is a high lift and a low lift cam. One can be as little as zero lift and the other can be as high as would be resonable.
Its a great idea, and i've heard that Honda has a more advanced version in the works that will supposedly encompass VTEC in all its glory, and somehow have the ability to deactivate one of the two intake and/or exhaust valves at low speed to help low end torque production.
@iNaStY1 thats great. My father is finally letting me have the 98' integra type R for college and i cant wait to aftermarket the engine. What do you think i should do first to the engine?
VTEC is a technological marvel, it set the standard for variable valve timing which is now used in other manufactures today. Dont confuse VTEC with ricers.
The best performing vtec engine ever created by Honda is the ultimate B18C-R (JDM). Found only in 1995-1999 Honda Integra Type R's (DC2). I have witnessed first hand what this intimidating front wheel drive vehicle is dominant over! I take my hat off to all employes of the Honda Corp. for the excellent work they have done in putting together a magnificent "fool your compeditors" FFD vehicle!
nah id be doing a lot of the mods with my dad in his garage. but for some things i would take it to the shop. and a truck really isnt a waste because you can still have a lot of fun in a truck.
Cams can only be optimized for a small range of rpm, VTEC allows for one cam to be optimized for low rpm and one for high rpm. So the low rpm cam actually allows for more power at low rpm than the high rpm cam would, and the high rpm cam allows for more power at high rpm than the low rpm cam would.
one of the first implementations of vtec was actually in the nsx thats why it was know in its day as having a high power engine (270) with a relatively modest displacement (3,2L)
@kowclubproductions your misunderstanding what i said. When they built the engine none of them failed using the vtec system, it was even qouted on top gear about the s2000. What your saying is the longevity of the car. I have an integra type R and the motor has never had a problem from the first time i got it 12 years ago
thats a bit of a generalisation. cams vary hugely from one engine to another. a ferrari v8 is going to have a more aggressive/lumpy cam for better performance vs the cam youd find in a luxury vehicle with a v8 designed for smoothness like a rolls royce or something
And yes you would need the exact gear ratios to figure out how much torque you have at the wheels. The point is the car with more power will always be able to make more wheel torque at a given rpm.
There is two completely different cam profiles, and yes when the changeover occurs timing duration and lift are altered at the same time. Any other VVT system CAN ONLY VARY TIMING. VTEC can have any profile you want at low revs and any profile you want at high revs, meaning you can literally have a full race cam AND a fully streetable cam IN ONE ENGINE. The only other systems that compare to VTEC are VVTL-i (not VVT-i), VarioCam Plus, some versions of MIVEC, VVL and one Ferrari VVT system.
Same principle as variable duration lifters (i.e. Rhodes Lifters) which have been around for a very long time. I don't get the double the gas mileage part, you're using a standard cam with a high lift cam built in, so that would mean you would get the same gas milage until the higher lift cam kicked in to give you more HP, which would then hurt your milage. Even increasing your fuel economy by 50% isn't going to happen with a cam or cam swap.
Friend has one of these. He installed a small pro charger and runs 4 to 6 pounds of boost, and OH MY GOODNESS!!! That dang car is now a ROCKET! (not that it was slow before). Beats 5.0s, Camaros, etc., like WOW! Volkswagen Jettas are the same way. 1.4 liter runnin' 4 to 6 pounds of teeny weeny turbo,...ZOOM!
valve life isnt the only thing that relates to hp/tq, duration has a lot to do with it to, but yes you have the right idea, vtec is basically have two different size camshafts in one, bigger lift and duration the more power is made at a certain rpm, bigger the cam and duration the more power is made at high rpms
it's not overcomplicated, i've only seen/heard of one person's vtec breaking, and his car had 230,000 kms on it, plus we aren't even sure if the vtec is broken or if the car's been chipped to be in high cam profile all the time (haven't bothered to check) from what i've experienced with my parents' cars, my own 2 cars, and my friends' cars, japanese cars are the most reliable and fuel-efficient. a lot of them are surprisingly quick and safe too
@redsoxfever100 it means there's no fixed rpm. it changes depending on driving conditions which means it kicks in when YOU need it and not when it wants to in simple terms. i'm just being lazy to explain it more than that :D
Another thing. Those mustangs are mid 13 second cars. PLENTY of k20 swaps with just bolt ons are running below those times. Some are even running high 12's with just bolt ons. So what do you think of your theory now, saying in a quarter mile in 5th gear (if it would even reach 5th in a quarter mile) that he would win if it was a GT? I can show you a full interior 2600lb 99 Si with a k20a2 swap and 210whp running 12.9. My 00 EX coupe weighs 2500lbs, and made 227whp with a k20a2 and bolt ons
@TwoStrokePower653 I don't think millions of miles is a bit much. With exact proper maintenance and proper care, these engines are designed to last that long. This means normal everyday driving, proper oil changed, regular gasket replacement, timing belt every 60k or timing chain every 90k. There are tons of small maintenance bits that people forget about as well, such as transmission flushes and cooling system flushes, water pump replacement, and so on.
@lilbluecar89 you didn't say 4500... the vid said that. do you work for honda? your other post suggests that. but anyway, so you are saying that the rpm is preset but the only thing that changes based on those inputs is whether the ECU switches cam lobes at that preset engine speed? OT: i don't own a honda - just another guy trying to learn stuff on the internet. i have a ford and was curious to know the differences between TIVCT & VTEC.
When VTEC kicks in, its game over whatever you has; Rustang, Corjunkvette, Trans Cram, Queerbird, Camarrow, etc. The power to weight ratio of a properly tuned CRX is better than a Power Wheels with drag radials and a F1 engine swap.
So VTEC is just variable valve timing. But it's only active at high RPMs. Because at low RPMs your Honda will be dragging it's ass with your valves hanging open like that.
@hb22man Uh, 185hp output from just 1.6 litters (B16B) or 125hp per liter (F20B) STOCK was only accomplished in racing engines before VTEC came around. VTEC engines still put out the highest HP per liter rating of any engine today. My Civic SIR race car with blue-printed engine puts out 178whp from 1.6L VTEC with all-stock internals yet retains all its driveability in idle and low-rpms. Thats the beauty of VTEC
would having performance cams installed be better? v-tec is to save gas right? u get normal cams at low rpms then you get aggressive cams when 'vtec kicks in, yo' at higher rpm's when ur fwd econo-box turns into a race car..
@lilbluecar89 from the wiki article on VTEC: "Switching between the two cam lobes is controlled by the ECU which takes account of engine oil pressure, engine temperature, vehicle speed, engine speed and throttle position. Using these inputs, the ECU is programmed to switch from the low lift to the high lift cam lobes when the conditions mean that engine output will be improved." logic dictates that there is no way in hell the rpm can be the same each time.
With me it's what is done to the car after it's bought that says most about it's owner. I've had a wide var. of cars and did a bit of mods but kept the body stock, I never liked the screwing of a design but like art it's down to each their own. Just hate some exhaust setups. Loved the 68 Firebirds, Had the 400CI version. Had a mid engine mod 69 Corvair with a chev 327 in the back seat. And to those that don't know it, it was the pre 65 corvairs that were the disaster with bad rear susp.
yes you can. You can have the Vtec on the whole time. but idle like SHIIT.. All you need is a modify cam made by TODA called V-Tec Killer Cam. Very expensive, and required valves, spring and retainer upgrade. Also the computer need chip to run that cam. Check it out at TODA website and here on youtube, one youtuber had it on his b18c1. Sound mean. Or you can add a Vtec controller, but lowest it'll go is 3000rpm(Field brand).
@dOOdOOdumb87 It sounds like that because more air is entering the engine. Just like if you were to add a high flow air intake, the engine would have a deeper tone to it.
I'm not much of a Honda guy but a friend of mine said you can change the Vtech to much lower rpm, but from what I got from this video that might take some power away...
@TwoStrokePower653 Oh man, I love how long Mercedes last. Especially their Diesels, I worked at a Merc-Benz dealer, and a customer brought his car in for maintenance, it had 514k on it and had already been flipped once (one and a half million miles). He took very good care of his car. Can't beat the Germans in reliability, that's for sure.
VETC improved VVT and when it was launched, in 89, Mitsubishi wanted to use a piece of tht creating the new era of turbo AWD: the EVO. bit i dont think the Evo had MIVEC (hence the name VEC coming from the Hondas VTEC) only found in the rest of the Mitsu's line up.
well yes it is great for that, but i mean in a racing situation it really means nothing since your always going in upper rpms, and bottom end tourque doesnt matter
you would have to purchase a new head... there is an actuator that is hydraulically operated using the engine's oil pressure... Camshafts are very difficult to recreate with the VTEC operation still in use, and is usually swapped with a generally more aggressive cam instead of having 2 different profiles.
@MrMister1227 You can but it wouldn't run smoothly or be economical below the VTEC point. VTEC is like having 2 engines in 1 - an economical high-torque engine in low-rpms, and a racing engine in high-rpms
You think all Honda 4 cylinders can't make power before redline or something? My cars VTEC is tuned with the low boundary set at 4200 and high boundary at 4500 RPM. And who doesn't redline when wanting to perform the best out of any car? And the GT's i'm talking about are the Ford Mustangs of 05-09, and 2010GT with only 315 crank HP. My friends 07 lost all 3 races pretty badly back when I had a stock k20 swap and 184whp. My motor won't seize either. It's been swapped for 4 years running strong
@TwoStrokePower653 My bro's CRX is bone stock, about 1k away from 260,000 miles. Maintenance and keeping up on regular fluid changes helps a ton. With routine maintenance, most engines can run hundreds of thousand, if not MILLIONS of miles without excessive damage.
Oh, pardon me, I'm sorry you didn't know this already, but VVT includes LIFT and DURATION. VVT is any mechanism that alters the shape or timing of a valve lift. But I guess if that's still over your head, then in 1975, GM patented their own variable valve lift technology. But I guess if you're really nitpicking over abbreviations, then we're talking about VVTL (Variable Valve Timing and Lift)
nice man, dats gonna rip once you chuck dat in. A car that a really admire that has an SR20DET is the Puslar GTiR, ive gotta give them credit for that.
is there any way to modify this vtec system slightly, in order to get the full vtec use permanatly - all of the time, so that the lache system is always in the position to deliver more fuel/power with the more piston travel?
Those high lift cams that give you a lopey idle kill your bottom end torque, they also destroy emissions and fuel efficiency. With VTEC you get to keep your low end, good emissions and fuel efficiency. No compromises.
Yeah but however those other systems don't give you such a difference between normal driving operation and during lift. I've driven the Mercedes C320 Komressor and felt it's valve timming, driven the Corola XRS and felt lift on it. None of have near the punch of VTEC.
just because they don't make the world's fastest cars, doesn't mean honda is a joke. there is obviously a reason or two behind the fact that the honda civic is canada's favourite car 10 years running
Vtec only kicks on after ~4000rpm, before that your 1.6L engine only has the valves opening 1/2 to 3/4ths of the way, thus less air getting in and less fuel getting put into the cylinder... and Honda's are known as "The Torque less wonders" I'm not saying its bad, but it really should kick in sooner, aka ~32(3)00rpm
I think this is cool to those who don't know about vtec, and Honda was the only manufacturer to make 100hp per liter engine. Ex: the civic si, 1.6liter engine 160 hp stock The integer gsr, 1.8liter 185 hp stock With a redline of 8500 rpm And capable of over 500 hp over 10,000 rpm from that for under 5 grand in parts Who else can do that and still make it street legal (at least make it look street legal)
@lukebailey457 vtec doest give the engine extra power. if the engine is made so that it has 200 hp@6000rpm, adding vtec dosnt increase hp. if the engine produces 100 hp at 2000 rpm and 200 at 6000rpm vtec is there so that it allows the engine to opperate at 5000 rpm and produce 200 hp instead of at 6000 rpm. if max shifting is at 5000 rpm you would miss the oprotunity to make 200hp. so vtec overall changes the rpm band so that the engine can produce its max hp at a lower rpm.
He had a manual and shift good. And there were more 05-09 GT's i've beaten, including a 2010 GT. I'ts known to just about everyone with a k20 swap in their 2000 and older civics. My friend and I went from a 20 roll, 40 roll, and another 40 roll. The lsat 40 roll, we kept going, and I took it to 150 MPH in 5th, and he was already 4 cars behind me. I didn't even use my 6th gear. A turbo would be laggy, and it will more than likely suck even more if someone shifted before redlining.
@Jedras992 the dodge viper engine COULD get more than 600 hp, but it's designed for power at all RPM's. not for a high, short peak power. that's why it's the fastest car to ever go around leguna seca
@LPWWE06 Hmm, so tell me how does it add more HP?? The point of the system is to provide good acceleration and fuel economy at the same time, as far as i know it has nothing to do with HP, but i might be wrong.
I love how Honda can take a seemingly complex idea and make it simple. The first time my dad explained this to me it seemed complicated, but after seeing this its not that complicated at all.
Watched Ed on "Wheeler Dealers" do a fix-up on one of these engines.
He described everything and how it worked as he fixed the issues.
Was awesome, and yes, one of the beautiful things about this system is that it is not all that complicated. Ed had it fixed and runnin' in a jiffy.
At a certain RPM the rocker arms lock up together allowing the Blue center cam (which is usually raised above the cam) to lift the rocker arms higher, opening up the valves longer.
ECU opens a solenoid to allow oil to flow into the cavity. The ECU uses (I think) input from either cam/crank angle sensor to determine RPM, unless there is a dedicated sensor
Old VTEC had like this?
@smouldering Yes I do work for Honda. And yes most versions of vtec have a preset for the engagement. For example, if you're driving a car with vtec and its a manual and you are climbing a steep hill if you are in second gear and you get the rpm up to the engagement point it will engage vtec because it feels that load regardless if it's a full trottle or not but if you where in fifth gear the car is going to feel the load but not engage the vtec because it's not hittings it's preset point.
I think that torque is created by the size of engine itself, but can't say, because V8 is quite rare here. Inline-4 is far the most common type. Me and my friend, who repairs/tunes cars, were talking about performance tuning. I mentioned, that maybe a cam with higher lift could be good. He answered me: "Well, you'll get power, but it's bye-bye low-end torque then."
This is a long stroke engine, so bigger intake valves helps low rnd6
I always bashed civics or any kind of japanese import for that matter without even stepping foot inside one. My friend got a civic si and when that vtec kicked in it brought such a smile to my face. I fet like a plane speeding down a runway and finally getting wheels off the ground.
Great video, simple and well done.
VTEC KICKED IN YO ! !
@redsoxfever100 smouldering is wrong...there is a fixed rpm range that vtec is activated, it just depends on the model that you have. Yes it takes a certain parameters to be met until vtec is activated but it does not change when the vtec is actually activated, unless you have vtec controller or aftermarket ecu then you can decide at what rpm to activate it.
Good video on the explanation. Simple and no fluff. I like it :)
The reason big two valve V8s have that lope is because part of the unburned intake charge is being pushed out of the exhaust valve at the beginning of the intake stroke. This is due to high cam overlap and causes the cylinders to fire unevenly (some cylinders are getting more of the intake charge than others). The reason for the high overlap is because cams are tuned for high rpm power, at the expense of low rpm power and driveablity. Toda VTEC killers give Honda engines the same loping idle.
it changes valve lift by way of an extra cam that is rotated which adjusts how the cam effects lift on the valve.
Its amazing how informational videos can spark such hardcore drama.
you have a point but it was a very good idea because, around town driving you want good low to mid range power, and you want good power on high rpm's vtec allows you to have both instead of giving up one or the other...
It's not lag. It is a pro, that it doesn't open up before higher revs. As I think, is that a lower valve lifting will create more torque, and torque is needed to get the car moving? And when it reaches higher revs, then the lift is changed to higher, giving extra power, which is more useful than torque at that point.
Don't forget about the 5th Gen Prelude's vtec. It feels awesome on it too.
@smouldering Yes that is correct but where u are wrong is that the vtec engagement is already preset. It's just if those inputs to the ecu are telling it to engage vtec or not. And that is from OUR HONDA R&D department. Not wiki I can go there and modify what it says.
And I've also driven some vehicles, after the cam tuning. It really felt like that.
P.s. What unit was that torque you said? Newton-meters?
VTEC varies lift between two settings. There is a high lift and a low lift cam. One can be as little as zero lift and the other can be as high as would be resonable.
Its a great idea, and i've heard that Honda has a more advanced version in the works that will supposedly encompass VTEC in all its glory, and somehow have the ability to deactivate one of the two intake and/or exhaust valves at low speed to help low end torque production.
@iNaStY1 thats great. My father is finally letting me have the 98' integra type R for college and i cant wait to aftermarket the engine. What do you think i should do first to the engine?
VTEC is a technological marvel, it set the standard for variable valve timing which is now used in other manufactures today. Dont confuse VTEC with ricers.
The best performing vtec engine ever created by Honda is the ultimate B18C-R (JDM). Found only in 1995-1999 Honda Integra Type R's (DC2). I have witnessed first hand what this intimidating front wheel drive vehicle is dominant over! I take my hat off to all employes of the Honda Corp. for the excellent work they have done in putting together a magnificent "fool your compeditors" FFD vehicle!
boy do I love short vids.
nah id be doing a lot of the mods with my dad in his garage. but for some things i would take it to the shop. and a truck really isnt a waste because you can still have a lot of fun in a truck.
I'll give ya that, my buddy has a turbo s2000 and the thing just sounds sick in the upper range
Cams can only be optimized for a small range of rpm, VTEC allows for one cam to be optimized for low rpm and one for high rpm. So the low rpm cam actually allows for more power at low rpm than the high rpm cam would, and the high rpm cam allows for more power at high rpm than the low rpm cam would.
one of the first implementations of vtec was actually in the nsx thats why it was know in its day as having a high power engine (270) with a relatively modest displacement (3,2L)
@kowclubproductions your misunderstanding what i said. When they built the engine none of them failed using the vtec system, it was even qouted on top gear about the s2000. What your saying is the longevity of the car. I have an integra type R and the motor has never had a problem from the first time i got it 12 years ago
thats a bit of a generalisation. cams vary hugely from one engine to another. a ferrari v8 is going to have a more aggressive/lumpy cam for better performance vs the cam youd find in a luxury vehicle with a v8 designed for smoothness like a rolls royce or something
And yes you would need the exact gear ratios to figure out how much torque you have at the wheels. The point is the car with more power will always be able to make more wheel torque at a given rpm.
There is two completely different cam profiles, and yes when the changeover occurs timing duration and lift are altered at the same time. Any other VVT system CAN ONLY VARY TIMING. VTEC can have any profile you want at low revs and any profile you want at high revs, meaning you can literally have a full race cam AND a fully streetable cam IN ONE ENGINE. The only other systems that compare to VTEC are VVTL-i (not VVT-i), VarioCam Plus, some versions of MIVEC, VVL and one Ferrari VVT system.
Same principle as variable duration lifters (i.e. Rhodes Lifters) which have been around for a very long time. I don't get the double the gas mileage part, you're using a standard cam with a high lift cam built in, so that would mean you would get the same gas milage until the higher lift cam kicked in to give you more HP, which would then hurt your milage. Even increasing your fuel economy by 50% isn't going to happen with a cam or cam swap.
Friend has one of these. He installed a small pro charger and runs 4 to 6 pounds of boost, and OH MY GOODNESS!!! That dang car is now a ROCKET! (not that it was slow before). Beats 5.0s, Camaros, etc., like WOW! Volkswagen Jettas are the same way. 1.4 liter runnin' 4 to 6 pounds of teeny weeny turbo,...ZOOM!
valve life isnt the only thing that relates to hp/tq, duration has a lot to do with it to, but yes you have the right idea, vtec is basically have two different size camshafts in one, bigger lift and duration the more power is made at a certain rpm, bigger the cam and duration the more power is made at high rpms
oh this how VTEC KICKED IN !
it's not overcomplicated, i've only seen/heard of one person's vtec breaking, and his car had 230,000 kms on it, plus we aren't even sure if the vtec is broken or if the car's been chipped to be in high cam profile all the time (haven't bothered to check)
from what i've experienced with my parents' cars, my own 2 cars, and my friends' cars, japanese cars are the most reliable and fuel-efficient. a lot of them are surprisingly quick and safe too
@redsoxfever100 it means there's no fixed rpm. it changes depending on driving conditions which means it kicks in when YOU need it and not when it wants to in simple terms. i'm just being lazy to explain it more than that :D
nothing can beat the z06 in handling or power for its price
Another thing. Those mustangs are mid 13 second cars. PLENTY of k20 swaps with just bolt ons are running below those times. Some are even running high 12's with just bolt ons. So what do you think of your theory now, saying in a quarter mile in 5th gear (if it would even reach 5th in a quarter mile) that he would win if it was a GT? I can show you a full interior 2600lb 99 Si with a k20a2 swap and 210whp running 12.9. My 00 EX coupe weighs 2500lbs, and made 227whp with a k20a2 and bolt ons
@TwoStrokePower653 I don't think millions of miles is a bit much. With exact proper maintenance and proper care, these engines are designed to last that long. This means normal everyday driving, proper oil changed, regular gasket replacement, timing belt every 60k or timing chain every 90k. There are tons of small maintenance bits that people forget about as well, such as transmission flushes and cooling system flushes, water pump replacement, and so on.
@ramentasty8 depends on the engine. I have a 1,6 Vtec engine (B16B) and Vtec kicks in at 6200 rpm
@lilbluecar89 you didn't say 4500... the vid said that. do you work for honda? your other post suggests that.
but anyway, so you are saying that the rpm is preset but the only thing that changes based on those inputs is whether the ECU switches cam lobes at that preset engine speed?
OT: i don't own a honda - just another guy trying to learn stuff on the internet. i have a ford and was curious to know the differences between TIVCT & VTEC.
LT1 is an engine from GM that was used in the C4 corvette and later the camaro.
@flamingarse1 It is, Nissan/Toyota/Mitsubishi all did a similar thing following Honda's lead, in fact the latest Ford Mustang has a form of VTEC
When VTEC kicks in, its game over whatever you has; Rustang, Corjunkvette, Trans Cram, Queerbird, Camarrow, etc. The power to weight ratio of a properly tuned CRX is better than a Power Wheels with drag radials and a F1 engine swap.
So VTEC is just variable valve timing. But it's only active at high RPMs. Because at low RPMs your Honda will be dragging it's ass with your valves hanging open like that.
@hb22man Uh, 185hp output from just 1.6 litters (B16B) or 125hp per liter (F20B) STOCK was only accomplished in racing engines before VTEC came around. VTEC engines still put out the highest HP per liter rating of any engine today. My Civic SIR race car with blue-printed engine puts out 178whp from 1.6L VTEC with all-stock internals yet retains all its driveability in idle and low-rpms. Thats the beauty of VTEC
would having performance cams installed be better? v-tec is to save gas right? u get normal cams at low rpms then you get aggressive cams when 'vtec kicks in, yo' at higher rpm's when ur fwd econo-box turns into a race car..
@lilbluecar89 from the wiki article on VTEC:
"Switching between the two cam lobes is controlled by the ECU which takes account of engine oil pressure, engine temperature, vehicle speed, engine speed and throttle position. Using these inputs, the ECU is programmed to switch from the low lift to the high lift cam lobes when the conditions mean that engine output will be improved."
logic dictates that there is no way in hell the rpm can be the same each time.
With me it's what is done to the car after it's bought that says most about it's owner.
I've had a wide var. of cars and did a bit of mods but kept the body stock, I never liked the screwing of a design but like art it's down to each their own. Just hate some exhaust setups.
Loved the 68 Firebirds, Had the 400CI version. Had a mid engine mod 69 Corvair with a chev 327 in the back seat.
And to those that don't know it, it was the pre 65 corvairs that were the disaster with bad rear susp.
yes it can. it can open the valves as early or late in the stroke as it wants its PWM controlled.
yes you can. You can have the Vtec on the whole time. but idle like SHIIT.. All you need is a modify cam made by TODA called V-Tec Killer Cam. Very expensive, and required valves, spring and retainer upgrade. Also the computer need chip to run that cam. Check it out at TODA website and here on youtube, one youtuber had it on his b18c1. Sound mean. Or you can add a Vtec controller, but lowest it'll go is 3000rpm(Field brand).
@dOOdOOdumb87 It sounds like that because more air is entering the engine. Just like if you were to add a high flow air intake, the engine would have a deeper tone to it.
Don't you just love your Variable Valve Timing and Lift Electronic Control? I know I do.
I'm not much of a Honda guy but a friend of mine said you can change the Vtech to much lower rpm, but from what I got from this video that might take some power away...
Good upload, I have a vtec engine, nice to know how it works :)
Honda gameplay: haha foot on pedal car go fast
Honda lore:
Simple and easily understand explain
@TwoStrokePower653 Oh man, I love how long Mercedes last. Especially their Diesels, I worked at a Merc-Benz dealer, and a customer brought his car in for maintenance, it had 514k on it and had already been flipped once (one and a half million miles). He took very good care of his car. Can't beat the Germans in reliability, that's for sure.
i agree with you, however for a pure sports car i wouldnt want it, but if you are looking for something versatile then its great
I know this was to explain how VTEC works, but if you think about it, it also shows you how camshafts work in other cars too.
the z06 has carbon fibre leafsprings which are lighter than any spring/torsion bar suspension out there
VETC improved VVT and when it was launched, in 89, Mitsubishi wanted to use a piece of tht creating the new era of turbo AWD: the EVO. bit i dont think the Evo had MIVEC (hence the name VEC coming from the Hondas VTEC) only found in the rest of the Mitsu's line up.
well yes it is great for that, but i mean in a racing situation it really means nothing since your always going in upper rpms, and bottom end tourque doesnt matter
composites still have carbon fibre in them, and it still weighs less than any coil over/torsion bar, and out performs them
vtec improves the volumetric efficiency of a four stroke, variations of the system were designed solely to provide improvements in fuel efficiency,
so basically they added an extra cam lobe per cylinder with a taller lobe, so theres more lift and duration?
where do you put the vtec switch , anyways I have one and it hits hard thanks
you would have to purchase a new head... there is an actuator that is hydraulically operated using the engine's oil pressure... Camshafts are very difficult to recreate with the VTEC operation still in use, and is usually swapped with a generally more aggressive cam instead of having 2 different profiles.
so if you wanna get vtec do you jus buy a camshaft with vtec or do you buy another engine?
The cam profiles look like 3 stage vtec tho but the movements do not. Just a demo i think, unless the boats work diffrently?
@MrMister1227 You can but it wouldn't run smoothly or be economical below the VTEC point. VTEC is like having 2 engines in 1 - an economical high-torque engine in low-rpms, and a racing engine in high-rpms
You think all Honda 4 cylinders can't make power before redline or something? My cars VTEC is tuned with the low boundary set at 4200 and high boundary at 4500 RPM. And who doesn't redline when wanting to perform the best out of any car? And the GT's i'm talking about are the Ford Mustangs of 05-09, and 2010GT with only 315 crank HP. My friends 07 lost all 3 races pretty badly back when I had a stock k20 swap and 184whp. My motor won't seize either. It's been swapped for 4 years running strong
@TwoStrokePower653 My bro's CRX is bone stock, about 1k away from 260,000 miles. Maintenance and keeping up on regular fluid changes helps a ton. With routine maintenance, most engines can run hundreds of thousand, if not MILLIONS of miles without excessive damage.
Oh, pardon me, I'm sorry you didn't know this already, but VVT includes LIFT and DURATION. VVT is any mechanism that alters the shape or timing of a valve lift. But I guess if that's still over your head, then in 1975, GM patented their own variable valve lift technology. But I guess if you're really nitpicking over abbreviations, then we're talking about VVTL (Variable Valve Timing and Lift)
nice man, dats gonna rip once you chuck dat in. A car that a really admire that has an SR20DET is the Puslar GTiR, ive gotta give them credit for that.
Having VTEC is almost like having a turbo....all of the lag, but none of the boost.
:D
is there any way to modify this vtec system slightly, in order to get the full vtec use permanatly - all of the time, so that the lache system is always in the position to deliver more fuel/power with the more piston travel?
Do vtec systems still only kick in at 4500 rpm or are they now more intelligent and kick in at different rpm ranges?
Those high lift cams that give you a lopey idle kill your bottom end torque, they also destroy emissions and fuel efficiency. With VTEC you get to keep your low end, good emissions and fuel efficiency. No compromises.
@GReaper147 Subaru has their own VTEC-like system, it's called AVLS
Yeah but however those other systems don't give you such a difference between normal driving operation and during lift. I've driven the Mercedes C320 Komressor and felt it's valve timming, driven the Corola XRS and felt lift on it. None of have near the punch of VTEC.
just because they don't make the world's fastest cars, doesn't mean honda is a joke. there is obviously a reason or two behind the fact that the honda civic is canada's favourite car 10 years running
@TwoStrokePower653 what im saying is all the vtec engines that honda made were never defective, they all worked correctly.
Vtec only kicks on after ~4000rpm, before that your 1.6L engine only has the valves opening 1/2 to 3/4ths of the way, thus less air getting in and less fuel getting put into the cylinder... and Honda's are known as "The Torque less wonders"
I'm not saying its bad, but it really should kick in sooner, aka ~32(3)00rpm
i'm sorry did this video just mention torque and vtec in the same video?
I think this is cool to those who don't know about vtec, and Honda was the only manufacturer to make 100hp per liter engine.
Ex: the civic si, 1.6liter engine 160 hp stock
The integer gsr, 1.8liter 185 hp stock
With a redline of 8500 rpm
And capable of over 500 hp over 10,000 rpm from that for under 5 grand in parts
Who else can do that and still make it street legal (at least make it look street legal)
the lt1 in camaros/vettes made 300lbsft at like 2500 rpm and 275hp in the low 5000's
@lukebailey457 vtec doest give the engine extra power. if the engine is made so that it has 200 hp@6000rpm, adding vtec dosnt increase hp. if the engine produces 100 hp at 2000 rpm and 200 at 6000rpm vtec is there so that it allows the engine to opperate at 5000 rpm and produce 200 hp instead of at 6000 rpm. if max shifting is at 5000 rpm you would miss the oprotunity to make 200hp. so vtec overall changes the rpm band so that the engine can produce its max hp at a lower rpm.
All jokes aside vtec is pretty awesome technology
"provides good low end torque for strong acceleration" I loled pretty hard at that one
He had a manual and shift good. And there were more 05-09 GT's i've beaten, including a 2010 GT. I'ts known to just about everyone with a k20 swap in their 2000 and older civics. My friend and I went from a 20 roll, 40 roll, and another 40 roll. The lsat 40 roll, we kept going, and I took it to 150 MPH in 5th, and he was already 4 cars behind me. I didn't even use my 6th gear. A turbo would be laggy, and it will more than likely suck even more if someone shifted before redlining.
Under 44 sec and now I know how vtec works lol
True! Even the Fiat Multipla looks unique.
The B16B is still the best HP/liter normally aspirated production engine ever!
@Jedras992 the dodge viper engine COULD get more than 600 hp, but it's designed for power at all RPM's. not for a high, short peak power. that's why it's the fastest car to ever go around leguna seca
I've seen a Hummer that runs on Diesel and makes almost 1000HP and still gets like 24MPG. Wish all cars were like that.
That's some clever engineering.
@LPWWE06 Hmm, so tell me how does it add more HP?? The point of the system is to provide good acceleration and fuel economy at the same time, as far as i know it has nothing to do with HP, but i might be wrong.