Just checked the brakes guys and they seem okay. Not grabbing at all might have been the reflection off the TV on the side of the dyno causing the red look. We may have found the problem though. I'll upload the fix soon!!
Close on the carbon build up but it’s the exhaust gas recirculation value that causes this. The EGR captures some of the exhaust gas and unbury fuel and puts it back into the intake. This gas has carbon and sometimes oil deposits in it which build up on the backs of the values. Before direct injection fuel would be sprayed over the valve when it’s open with the incoming air. This cleaned the valve and valve seat. This no longer happens with direct injection.
defo not a reflection, you can see the pinchpoint and the heat trail. on the front near side disc. Id look into that and then swap out the bodge injectors for OEM !!
@@ollienathan6554 as soon as i seen this glow red straight to comments to see if anyone noticed the glow.. low and behold Those front pads are defo not realising.
Sorry to hear of the power loss, hopefully its something simple. Dont know if you guys have it in the UK but I've been using a product called seafoam on all my cars for many years, you can put it in the fuel, oil, and intake. I use a can in fuel after every oil change, I'll put a can in oil between 50 to 100 miles before an oil change as well as an intake service. Haven't had carbon issues yet in any of my 4.2s, or other Audi's. It's the safest I've found for our sensor ridden audi. Good luck finding the loss in power, keep up the hard work
@@joemartin3240 I was skeptical about the seafoam product but I guess Ill give it a try. had carbon cleaning done on my s5 already but I guess its always good to take care of em and not have to clean it so often.
8:33 there's your problem, I had this on my S5 ML09YOO years ago. One HPFP was on the way out so replaced it, then the other went soon after so 100 recommend you replace both of these at the same time as soon as you can.
That's because u need to reset the adaptions, when fitting either HPFP, nox sensor, as well as injectors. How can the car know to change full trims otherwise.
Love how you actually deal with all problems you have and don’t want to show everything “as perfect” to public because obviously it’s not. Well done mate and keep doing this stuff👌👌 enjoying watching your builds🏁🏁
Stock S5 B8’s are 354 HP to the crank. Add 17/25% for the drivetrain loss since its AWD and you get about 283 whp (for a 20% drivetrain loss, and 265 whp for 25%). It lost closer to half of what you said ! Was it a dynojet or mustang dyno? Coz that could change it too. Stay positive, I don’t think its that bad.
lonewolf 729 Yes, but that’s not my point, he said that the S5 is around 354 bhp which isn’t true. Its closer to 270 whp, so its far from 100 whp weaker than stock.
Tbh when I'm editing the vids I bore myself with my talking so I just try get to the "interesting" part. Can't stand watching videos of guys sitting talking the their car for the full Vid. So lazy
Man you are so calm and collective over the massive loss of power. I’d be pulling my bloody hair out ! Lol...Sweet video brotha, keep’m coming I really enjoy watching them . Good luck.
Sorry to say Mat, but from my experiance with them a loss of over a 100 hp and rough idle usualy means very low compression, its either engine rebuild or 2nd hand one. From cars unknown history and the fact that it was clocked before it realy is a no brainer.
The 4.2 FSI engine was rated at 354bhp at the crank. As others have pointed out there will be a considerable power dip as the rolling road is reading at the wheels, especially with an AWD set up. Nonetheless, I would hope to see around 300bhp in a healthy car, so there would appear to be losses somewhere. VCDS would be a useful guide here, starting with cylinder compression (cause its easy to check) and working back up the fueling system, ie injectors and High Pressure Fuel Pumps. Follow Ockham's Razor - all factors being equal, the simplest explanation is most often the correct one.
You should be expecting around the low 300's to the wheels due to drivetrain loss. Mine was at 310 when I got it dyno'd. Carbon cleaning wasn't too recent though.
It might not be, but that shot of the front wheel on the first dyno run looks like the brake is binding and making the disc pretty hot! Probably not, but there’s a decent loss if so.
Not educated in cars at all but -> I understood that the compression of the cylinder could say a lot about the general health of an engine. You could maybe measure and find out if it still has its original compression values (or close to it). I really enjoy your content btw!
Well the 329 is crank horse power before drivetrain loss and dynos usually read out wheel horsepower so after the math of drivetrain loss your no far off. AWD cars lose 17-25% HP loss at the wheela! Hope this helps some head scratching
I just had my 2011 S5 (6M) intakes cleaned at 118K miles - HOLY MOLEY! Like turbo's and a new exhaust had been fitted. Don't delay - if you're thinking about it - get her done!
Thanks again for the great story, Turbo Beetle 2.0L carbon cleaned at 65,000 when the intake tech bulletin paid for the butterfly valve weakness because it's part of the Emissions system. It pulls like a rocket all the way out to 6800 rpm's, with 18 psi boost. From lift off it's a rocket from 0-60. It's now at 86,000 and she is fun do throw around still. The Audi 2.0T weighs a couple of pounds more, has the API Stage1 Tune. It is a high roller once it reaches about 3700 rpms and pulls really quick and strong to 100 on the open road. Surprisingly quick from 60 mph to 100. Probably 3 seconds without touching the floor with the peddle or punching, and very smooth. at 109,000 on the OD. I would think this has never been done. It can be a turd from zero to 30 mph sometimes. It does not have the quick DSG, but still must be struggling without boost. I bet this would turn the crank a bit better no ? Might be worth a go come summer. Great vids and thanks for sharing. I bought an A5, same year model, and all. It had 80,000 on it and seemed to run strong, but carbon was very very bad and I took it back to the guy who sold it to me for full price once all the engine codes and misfires happened to throw many codes that he had cleared. It took some firm discussion, but I was not taking the hit on all of the repairs he knew he left unfinished and left in the price. He also admitted to the code clearing, since four or five lights went off in succession within 100 miles. I was sad because it was a beautiful machine no doubt. Who knows what else may have been wrong? Great videos, and following. Thanks for sharing. But I'M SURE GOING TO WAIT TILL YOU SPEND YOUR MONEY FIRST. Yeah if you can find another 50 hp somewhere on this one, I may try whatever you discover for my before boost missing power on my A4
Standard - Plugs, leads, injectors, air - intake (clean/change filter) Replace All. And check the brakes aren’t binding... seemed to be red and wouldn’t expect to see that !
That’s a lot of ponies gone, wow... about a previous video, showing the underside, you noticed cats without sensors; correct! Your car (and many other V6/8/10 engined Audis) have four O2 sensors and four cats; from the tirbos or manifolds to the exhaust tips you will find an upstream O2 sensor, a pre cats a downstream O2 sensor, and then a main cats. The cats are notorious for becoming clogged, even without throwing codes. Delete all four cats (by installing some nice stainless afternarket downpipes for example) and have the downstream sensors coded out, then dyno again. I think you will regain a lot of power there, as many others before you have! Cool car btw, keep on the good work! Cheers
Previous S4 owner and you need to do a compression check. Surprised this was not done before the walnut blast. Anyhow, these engine are prone to cylinder bore wear . The don't have liners, instead use a silica coating patented by Porsche. The problem is when the engine is ragged when cold it damages the engine bores and the result is a loss of power in and high oil consumption. That's one of the reasons why the 1st gen RS4 had a rev limited until the engine was warm.
same here Mat when i first got hte car it pulled mad crazy now its lost that kick still runs fine but the power aint the same i feel like you and i have the same issue will be following closely, hope you get to the bottom of this and get those 100 horses back ! cheers for the videos mate, Nick USA
Respect for your honestly chap. Seems like you’ve brought a bit of a pig, but at least you’re not afraid to get your hands dirty and crack on with whatever is required. Top man, keep up the great content for the channel 👍
Wheel horse power is always less than brake horse power and even more so in an AWD car. So 242hp at the wheels ain't as bad as you think. Great vid as always 👍🏻
New subscriber since this audi build, your a top geezer love how you pretty much do everything yourself. Another good vid with this one but one thing I would say and it's no hate....PLEASE stop clapping!! 🤯
Loving the videos Matt, also your straight forward approach is fab, we need more Matt's in the world haha. Keep up the good work. And good luck finding those missing horses ;-)
Taking the positives out of it at least you know the carbon has been blasted and you now know the injector wiring loom has been messed about with and needs to be fixed so hopefully that’s where the problem lies. Surely a loom off a S5 that’s being broken will be good to use. Onwards and upwards! Leo up the good work 👍🏻
I’m pretty sure 354 is crank hp; additionally, you have to account for drive train loss, awd, torque converter, transmission...even peak power, with maybe a 15-16% drivetrain loss on the Quattro system you’ll run close to 290-300
Great videos. Now I might be wrong here but the 350HP is the number the engine produces. The dyno is measuring the power at the wheels. So from the engine to the wheels you’ll have power loss for sure. Mightn’t be 100 but it will be something 😊
The rated horsepower output and the power at the wheels is usually about 15% different so 350 hp rating should deliver you about 297 at the wheels. You're not too far off. All new synthetic fluids will probably find you a few more. New air filters and plugs would probably get you a couple too. Thanks for the video. It was great to see what the before and after really gets you.
🤔 mmm seems to me like someone has fitted non OE injectors in there and has had to change the plugs as they were the wrong fittings Turbo it, it’s the only answer 😂👍🏻
This is my diagnosis too, I have detailed my thoughts in other posts, but that is bang on along with the damage or false readings 02 and lambdas will be reading
That’s what I said also you have to code them if upgrading I’m pretty sure if it’s anything like bmw and obviously if they haven’t coded them then the OBC can’t determine how much fuel to supply
Yeah, to code is very easy, on the BMW's, all you need is the software, and calibrated values which are usually on the side of the new injectors, take note of the values and then enter via the software very easy.
The coding is easy, IIRC, both Audi and BMW dealers don't code them just fit them which seems odd, also the HPFP and LPFP, could be an issue but that would come up on the fault readings, also easy to check for, I would go for the most obvious first via live data checking, but those hacked looms look very suss
Had my 2.0TFSI intake manifold also blasted clean but the thing was it produced the same amount of power even when it was dirty for some reason, the intake was so dirty that it started to run on just a couple of cylinders that is why it was cleaned.
Get it down to mrc or do some data logging! Should give you an idea of where your loosing power? Guessing it’s pulled timing due to faulty lamba maybe...? Good luck! Can’t wait to find out what happens 🤙
I don't even think you would get 350bbhp straight out of the factory on that Dyno. Have heard from a few people that Audi are a bit optimistic with those figures. Friend of mine has an RS4 which is meant to be 420 standard, he now only gets 400 on a stage 2 map
Hi mate. I have a scirroco 2.0l tsi gt. Running as standard at the moment but had a few issues. Had a new timing chain done and injectors. Cost me a fortune but wow it was worth it. The car is 210bhp but there is a massive difference since having the work done. It feels much quicker but need to get it on a dyno.
remember your hp numbers on a dyno are showing the power going to the wheels. you lose about 15% of the normal horsepower number when measuring horsepower going to the wheels. therefore a normal dyno number would probably be about 300 hp, making you only 50 hp off.
Another good video chap. I know you will get the wiring on those injectors sorted at some time. Very odd were the horses have gone but like you said the engine runs sweet . I am sure they will return. Look.foraard to the next vid
fair play to you man. ive got the same s5 rs conversation with the rs exhaust back boxes fitted so it fits in the holes nice. completely standard. will do 0 to 60 in 4.9 seconds and its never had a carbon clean. im at 72000 miles. deffo somthimg not right have you done a 0 to 60 be interesting to see what you get! get some ps4's pluses on there man
Hey Mat, I have the feeling that something with the air mass flow sensor isn't right because this kind of huge PS difference ist often caused by a wrong gasoline air mixture (when there are no other failure messages). So the Lambda error is correlated to that. I would also check the compression on each cylinder. I would also check the turbo for a lack of compression!
Common numbers unfortunately. I have the same vehicle and after picking it up expecting 350 horsepower and it feeling quick I read nothing but 250 for everybody across the board from Factory so they're very overrated. That plus the only way to really get horsepower out of it it's going to be a supercharger I really wish I would have went for the v6.
Check the entire exhaust system. If all good with the engine and sensors my guess is something is blocking exhaust flow. Had this issue on a Porsche 944T I raced.
You should get an endoscope and look inside each cylinder through the spark plug hole. The 3.2 FSI and 4.2 FSI are notorious for developing scored cylinder walls if they've been on the longlife oil service and beaten on when cold (knowing the history of this car, it probably wasn't babied :/). If there's scoring and a compression test also shows an issue then unfortunately your engine is toast. But let's hope it's only something in the fuel system as others have mentioned.
Audi. I owned a 2010 1.8tfsi. All good while it lasted, shat it self at 75,000km. Fill up the oil check the fuel. It’s a pity Audi has such a shit VW motor and DSG transmission. Absolutely crap. Audi Australia where so surprised with the oil consumption issue and didn’t fix. The TT is such a beautiful design. Sold the junk A3 bought a Disco 3TDV6 best move I made. No more oil usage stress. LR3 are the best 4wd ever. Good luck Mat with the Audi. At least you have content for your TH-cam. I feel for the poor souls that have purchased such junk Audi. Good luck and hope you have heaps of 💰
Mate I can tell you now that wall but blast would not increase it by much. I would say the fuel injectors are the wrong ones for the car that’s why the wiring was butchered probably because the connectors were different. If it’s anything like the bmw you have to have the fuel injectors coded when you upgrade them
The injectors on the S5 are a HUGE HUGE HUGE failure point. They fail ALL the time, usually ending up in catastrophic engine damage. Recommended to replace them ASAP. As for carbon buildup, you will see performance altering buildup on the 4.2L as early as 10K miles. Get the JHM Tune to wake up the car.
Seem that you need to check out valves and piston rings within injector, I know it sounds like a bad news but this happens quiet often on such mileage with that engines. might be wrong but I'd start from measuring compression.
that 100bhp could be in the oil. try changing the oil to something else... if you get lard on the tips of your fingers everything feels slippery... cheep oil is considered as vegetable oil, get it on your fingers its slippery for a second or two then the pads of your fingers start to grab each other. try a formulation of Royal Purple w/STP heavy stabilizer to match the oil to the viscosity it needs given its operational conditions. probably going to end up costing $200 with a filter and line flush. those two brands i listed have may additives in them "highly refined in manufacturing", that's why they are so expensive.
I had that issue last year with my 4.2 S5, except mine seemed to have more symptoms and codes shown. It took about 2 months of guessing and trial and error before I decided to just get all new injectors. A week later, new injectors, plugs, coils, and a carbon clean and my car was running good as new! Hope this helps.
Good build so far, really enjoying the videos. Sux about the HP loss. Injector situation seems fishy, maybe the previous owner replaced the injectors with aftermarket and they didn't fit/ connect correctly. Has the lamba code gone away? I'm not sure about this but is it possible it previously had a supercharger or turbo, hence the work near the intake /after market injectors? Possibly check the fuel pressure, lambda sensor, maybe it has some weird tune on it?
Multistage inlet manifold flaps staying open preventing the short path for air as the revs rise? or possibly collapsing cats causing massive restriction. Had the former on my B6 S4 and it felt torquey low down but went flat above 4krpm, vaccum hoses for flap control were perished.
350@crank. You should be making about 275 to the wheels. you are losing HRSPRS, but not as many as you may think. Check those injectors, check your air filter.
Could be so many things. Injectors would have been easy to check but i understand the situation. If the catalyst is broken/blocked it could kill the power. Also the lambda may have a fault because of that.
might be your engine timing chain usually they stretch if you have a broken engine tensioner . only down side to these engines but once work is complete its very reliable. i had a 3.2 v6 suffers similar problem. best to just rebuild engine yourself it isnt as hard to do but requires alot of time.
Just checked the brakes guys and they seem okay. Not grabbing at all might have been the reflection off the TV on the side of the dyno causing the red look. We may have found the problem though. I'll upload the fix soon!!
Close on the carbon build up but it’s the exhaust gas recirculation value that causes this. The EGR captures some of the exhaust gas and unbury fuel and puts it back into the intake. This gas has carbon and sometimes oil deposits in it which build up on the backs of the values. Before direct injection fuel would be sprayed over the valve when it’s open with the incoming air. This cleaned the valve and valve seat. This no longer happens with direct injection.
defo not a reflection, you can see the pinchpoint and the heat trail. on the front near side disc. Id look into that and then swap out the bodge injectors for OEM !!
@@ollienathan6554 as soon as i seen this glow red straight to comments to see if anyone noticed the glow.. low and behold
Those front pads are defo not realising.
Sorry to hear of the power loss, hopefully its something simple. Dont know if you guys have it in the UK but I've been using a product called seafoam on all my cars for many years, you can put it in the fuel, oil, and intake. I use a can in fuel after every oil change, I'll put a can in oil between 50 to 100 miles before an oil change as well as an intake service. Haven't had carbon issues yet in any of my 4.2s, or other Audi's. It's the safest I've found for our sensor ridden audi. Good luck finding the loss in power, keep up the hard work
@@joemartin3240 I was skeptical about the seafoam product but I guess Ill give it a try. had carbon cleaning done on my s5 already but I guess its always good to take care of em and not have to clean it so often.
Dude, i love your videos so much but PLEASE for the love of God stop worrying about what people say in the comments..your content is quality
This 👌
💯👊🏾
Yeah agreed. You are doing it, we are watching. Have confidence... even if you guess and are wrong, we support you.
Truth be spoketh
8:33 there's your problem, I had this on my S5 ML09YOO years ago. One HPFP was on the way out so replaced it, then the other went soon after so 100 recommend you replace both of these at the same time as soon as you can.
I just replaced mine and the power has yet to return
That's because u need to reset the adaptions, when fitting either HPFP, nox sensor, as well as injectors. How can the car know to change full trims otherwise.
The only TH-camr not selling there 'dream' car.
😂 😂 😂
Marcus Harley or raffling it 😂
The other lad lost his way big time and the A5 is living proof 😂😂😂😂
Goth Lee lockwood...lol
Cause he could probably afford it
Love how you actually deal with all problems you have and don’t want to show everything “as perfect” to public because obviously it’s not. Well done mate and keep doing this stuff👌👌 enjoying watching your builds🏁🏁
Stock S5 B8’s are 354 HP to the crank. Add 17/25% for the drivetrain loss since its AWD and you get about 283 whp (for a 20% drivetrain loss, and 265 whp for 25%). It lost closer to half of what you said ! Was it a dynojet or mustang dyno? Coz that could change it too. Stay positive, I don’t think its that bad.
at 2:23 it does say flywheel bhp?
lonewolf 729 Yes, but that’s not my point, he said that the S5 is around 354 bhp which isn’t true. Its closer to 270 whp, so its far from 100 whp weaker than stock.
He said “bhp” so what he said was correct...
Bufan666 MuayThai nope he said bhp for 354 stock which isn’t the case, re watch the vid. He even said that he lost 100bhp which isn’t true
The figures on the dyno screen are at the crank not at the wheels which would mean his car only has about 180hp at the wheels
Hope you manage to round up those horses soon! Thanks for coming.
The difference between you and the other TH-camrs is you don't mess about your straight to the point no faffing about just class videos!
Tbh when I'm editing the vids I bore myself with my talking so I just try get to the "interesting" part. Can't stand watching videos of guys sitting talking the their car for the full Vid. So lazy
@@MatArmstrongbmx few people I watch on here talk and talk and talk and before you know it your 5 mins in and nothing happened , keep it up 👌
Mat if u look at the video at 2 minute mark the front disk appears be looking red ure sure not got eny binding creating power loss ?
mike smith very good point
I noticed that too. Didn’t know if it was just the light though?
defo looks like a slight red glow there.
Well spotted.
Eagles eyes mate didn't even notice
Man you are so calm and collective over the massive loss of power. I’d be pulling my bloody hair out ! Lol...Sweet video brotha, keep’m coming I really enjoy watching them . Good luck.
Still cant believe how good the wrap looks! You did a great job on that! Normally I dont like blue, but this is an exeption
Looks like the San Marino blue on an M4
Blue is the most superior color
Binge watched this whole series today! Love the colour wrap. Subbed! I have a 1 series so the other projects also of huge interest!
That wrap is actually really well done, how do you do such a good job despite being untrained?
A lot of it comes down to the wrap you buy, if you buy a high quality expensive wrap it's 10x easier than trying to wrap with cheap wrap.
Sorry to say Mat, but from my experiance with them a loss of over a 100 hp and rough idle usualy means very low compression, its either engine rebuild or 2nd hand one.
From cars unknown history and the fact that it was clocked before it realy is a no brainer.
I’d be looking at high pressure fuel pump or injectors , especially with that bodge job
Ever thought about a 5mm spacer for the rear wheels? I think it'll look good, little more flush with the fender with your stance.
Well done again Mat 👍🏻.
Sorry to see so many horses have escaped, but on the flip side - makes for great content finding them again!! Keep it up.
The 4.2 FSI engine was rated at 354bhp at the crank. As others have pointed out there will be a considerable power dip as the rolling road is reading at the wheels, especially with an AWD set up. Nonetheless, I would hope to see around 300bhp in a healthy car, so there would appear to be losses somewhere. VCDS would be a useful guide here, starting with cylinder compression (cause its easy to check) and working back up the fueling system, ie injectors and High Pressure Fuel Pumps. Follow Ockham's Razor - all factors being equal, the simplest explanation is most often the correct one.
You should be expecting around the low 300's to the wheels due to drivetrain loss. Mine was at 310 when I got it dyno'd. Carbon cleaning wasn't too recent though.
Take a shot every time he claps 😂
Steven who should I be aiming for?
It might not be, but that shot of the front wheel on the first dyno run looks like the brake is binding and making the disc pretty hot! Probably not, but there’s a decent loss if so.
At 2:01 onwards
Well spotted.
Just noticed this. Litterally went outside just now to check but seems okay. But I'll keep you guys updated. Thanks for commenting
Not educated in cars at all but -> I understood that the compression of the cylinder could say a lot about the general health of an engine. You could maybe measure and find out if it still has its original compression values (or close to it).
I really enjoy your content btw!
I would have thought that if low compression their would be sines like misfire
@@jayosullivan4756 I thought it was the wearing of the cylinder and pistons what is causing the lack of compression
The piston rings is one of them yes but their are a fue for loss of compression leaking valves, head gasket etc etc
I will almost guarantee that he’s problem is non compression related but more injector air intake or NOX sensor related
Loving your stuff!! Funny and honest!
Keep it up mate !!!
Well the 329 is crank horse power before drivetrain loss and dynos usually read out wheel horsepower so after the math of drivetrain loss your no far off. AWD cars lose 17-25% HP loss at the wheela! Hope this helps some head scratching
I just had my 2011 S5 (6M) intakes cleaned at 118K miles - HOLY MOLEY! Like turbo's and a new exhaust had been fitted. Don't delay - if you're thinking about it - get her done!
Fairplay matt.... ypur content has gone up a level. The s5 looks amazing also. Keep it up bro👌👍
love the videos mate you seem like a great chap, well edited content, cant fault it keep up the good work
Great to see you hooking up with these gentlemen, spot on.
Thanks again for the great story,
Turbo Beetle 2.0L carbon cleaned at 65,000 when the intake tech bulletin paid for the butterfly valve weakness because it's part of the Emissions system. It pulls like a rocket all the way out to 6800 rpm's, with 18 psi boost. From lift off it's a rocket from 0-60. It's now at 86,000 and she is fun do throw around still. The Audi 2.0T weighs a couple of pounds more, has the API Stage1 Tune. It is a high roller once it reaches about 3700 rpms and pulls really quick and strong to 100 on the open road. Surprisingly quick from 60 mph to 100. Probably 3 seconds without touching the floor with the peddle or punching, and very smooth. at 109,000 on the OD. I would think this has never been done. It can be a turd from zero to 30 mph sometimes. It does not have the quick DSG, but still must be struggling without boost. I bet this would turn the crank a bit better no ? Might be worth a go come summer. Great vids and thanks for sharing. I bought an A5, same year model, and all. It had 80,000 on it and seemed to run strong, but carbon was very very bad and I took it back to the guy who sold it to me for full price once all the engine codes and misfires happened to throw many codes that he had cleared. It took some firm discussion, but I was not taking the hit on all of the repairs he knew he left unfinished and left in the price. He also admitted to the code clearing, since four or five lights went off in succession within 100 miles. I was sad because it was a beautiful machine no doubt. Who knows what else may have been wrong? Great videos, and following. Thanks for sharing.
But I'M SURE GOING TO WAIT TILL YOU SPEND YOUR MONEY FIRST. Yeah if you can find another 50 hp somewhere on this one, I may try whatever you discover for my before boost missing power on my A4
Another great vid Matt but please stop clapping, it grinds me 😂
Standard - Plugs, leads, injectors, air - intake (clean/change filter) Replace All. And check the brakes aren’t binding... seemed to be red and wouldn’t expect to see that !
That’s a lot of ponies gone, wow... about a previous video, showing the underside, you noticed cats without sensors; correct! Your car (and many other V6/8/10 engined Audis) have four O2 sensors and four cats; from the tirbos or manifolds to the exhaust tips you will find an upstream O2 sensor, a pre cats a downstream O2 sensor, and then a main cats. The cats are notorious for becoming clogged, even without throwing codes. Delete all four cats (by installing some nice stainless afternarket downpipes for example) and have the downstream sensors coded out, then dyno again. I think you will regain a lot of power there, as many others before you have! Cool car btw, keep on the good work! Cheers
I really love what you're doing with the car mate. Doing things realistically and with honesty 👌 keep it up! That blue wrap looks SICK
I gotta say, loved the original paint of the car, but the wrap is also very good looking!
Watching all your videos from the start and you're just brilliant, Mat. Loving the S5!
Looks like your front brakes are grabbing, discs glowing red on the first run????
So true.
Well spotted mate 👌
Nah that's not glowing red, its reflection, from dyno ramp, wouldn't glow red that quick, hahah. Face-palm
Brake discs look to be glowing red on the first dyno run - think that is where the power is being lost, binding brakes.
Well spotted
ModifiedAbsolute I think it’s just the reflection from what the monitor is sitting on
Great spot, completely missed that when I watched it 👍
Previous S4 owner and you need to do a compression check. Surprised this was not done before the walnut blast. Anyhow, these engine are prone to cylinder bore wear . The don't have liners, instead use a silica coating patented by Porsche. The problem is when the engine is ragged when cold it damages the engine bores and the result is a loss of power in and high oil consumption. That's one of the reasons why the 1st gen RS4 had a rev limited until the engine was warm.
same here Mat when i first got hte car it pulled mad crazy now its lost that kick still runs fine but the power aint the same i feel like you and i have the same issue will be following closely, hope you get to the bottom of this and get those 100 horses back ! cheers for the videos mate, Nick USA
Always thought it seemed slow when you were launching it when you first got it. Makes sense now
Is it definitely an ‘S5’... similar power to a TDi A5 😂😂😂
Kris Pottinger Audi tdi 3.0 can make 350 easily 😂😂
T Hanks yeah I think you know he didn’t mean the 3.0 twat
Darkside push A5's to over 450
Don’t think an a5 would have 8 cylinders lol
Respect for your honestly chap. Seems like you’ve brought a bit of a pig, but at least you’re not afraid to get your hands dirty and crack on with whatever is required. Top man, keep up the great content for the channel 👍
Wheel horse power is always less than brake horse power and even more so in an AWD car. So 242hp at the wheels ain't as bad as you think. Great vid as always 👍🏻
Would be interesting to see what a compression test would have to say...
I'd be interested in that, i feel its the elephant in the room that the engine is just plain worn out. Could be completely wrong tho..
@Matt P It's still a thing. Would be great if not 😂😂😂
he should mechanically sort it out first before looks
@Matt P who on earth told you that 🤦♂️😂 piston rings are piston rings, they wear and you lose compression regardless of age or engine.
New subscriber since this audi build, your a top geezer love how you pretty much do everything yourself. Another good vid with this one but one thing I would say and it's no hate....PLEASE stop clapping!! 🤯
Really happy your channel got on my recommeded, great series, great videos. Keep up the good work!
Loving the videos Matt, also your straight forward approach is fab, we need more Matt's in the world haha. Keep up the good work. And good luck finding those missing horses ;-)
Really enjoying this build mate 👍
Taking the positives out of it at least you know the carbon has been blasted and you now know the injector wiring loom has been messed about with and needs to be fixed so hopefully that’s where the problem lies. Surely a loom off a S5 that’s being broken will be good to use.
Onwards and upwards! Leo up the good work 👍🏻
Solid vid mate, hope you get it sorted and UNLEASH THE BEAST
I’m pretty sure 354 is crank hp; additionally, you have to account for drive train loss, awd, torque converter, transmission...even peak power, with maybe a 15-16% drivetrain loss on the Quattro system you’ll run close to 290-300
It’s automatic so it’s 20/25% power loss
Great videos. Now I might be wrong here but the 350HP is the number the engine produces. The dyno is measuring the power at the wheels. So from the engine to the wheels you’ll have power loss for sure. Mightn’t be 100 but it will be something 😊
Love the shots on this episode, really good filming. Also like the diagrams
Broo you keep bettering your content! Massive thumbs up again that editing was siiiiick?!?! 💯💯💯
The rated horsepower output and the power at the wheels is usually about 15% different so 350 hp rating should deliver you about 297 at the wheels. You're not too far off. All new synthetic fluids will probably find you a few more. New air filters and plugs would probably get you a couple too. Thanks for the video. It was great to see what the before and after really gets you.
Phillip Todd For Awd it’s 17/25%
🤔 mmm seems to me like someone has fitted non OE injectors in there and has had to change the plugs as they were the wrong fittings
Turbo it, it’s the only answer 😂👍🏻
This is my diagnosis too, I have detailed my thoughts in other posts, but that is bang on along with the damage or false readings 02 and lambdas will be reading
That’s what I said also you have to code them if upgrading I’m pretty sure if it’s anything like bmw and obviously if they haven’t coded them then the OBC can’t determine how much fuel to supply
Yeah, to code is very easy, on the BMW's, all you need is the software, and calibrated values which are usually on the side of the new injectors, take note of the values and then enter via the software very easy.
Yes it is but looking at the state of he’s injector wiring I doubt whoever did that would have no idea about NCSExpert etc
The coding is easy, IIRC, both Audi and BMW dealers don't code them just fit them which seems odd, also the HPFP and LPFP, could be an issue but that would come up on the fault readings, also easy to check for, I would go for the most obvious first via live data checking, but those hacked looms look very suss
Had my 2.0TFSI intake manifold also blasted clean but the thing was it produced the same amount of power even when it was dirty for some reason, the intake was so dirty that it started to run on just a couple of cylinders that is why it was cleaned.
Get it down to mrc or do some data logging! Should give you an idea of where your loosing power? Guessing it’s pulled timing due to faulty lamba maybe...? Good luck! Can’t wait to find out what happens 🤙
I don't even think you would get 350bbhp straight out of the factory on that Dyno. Have heard from a few people that Audi are a bit optimistic with those figures. Friend of mine has an RS4 which is meant to be 420 standard, he now only gets 400 on a stage 2 map
Mate ur front brake disc is red hot at 2:00 u sure is not something biding there???
Hi mate. I have a scirroco 2.0l tsi gt. Running as standard at the moment but had a few issues. Had a new timing chain done and injectors. Cost me a fortune but wow it was worth it. The car is 210bhp but there is a massive difference since having the work done. It feels much quicker but need to get it on a dyno.
remember your hp numbers on a dyno are showing the power going to the wheels. you lose about 15% of the normal horsepower number when measuring horsepower going to the wheels. therefore a normal dyno number would probably be about 300 hp, making you only 50 hp off.
the drive train loss of a all wheel drive car is about 20%
Another good video chap. I know you will get the wiring on those injectors sorted at some time. Very odd were the horses have gone but like you said the engine runs sweet . I am sure they will return. Look.foraard to the next vid
I'm glad to hear an exhaust is coming!
That'll be your 100hp for sure! Lol
fair play to you man. ive got the same s5 rs conversation with the rs exhaust back boxes fitted so it fits in the holes nice. completely standard. will do 0 to 60 in 4.9 seconds and its never had a carbon clean. im at 72000 miles.
deffo somthimg not right have you done a 0 to 60 be interesting to see what you get! get some ps4's pluses on there man
That's a wicked visual at 5:30!
Wasn't sure about the blue wrap at first but now looks awesome 👍🏻👍🏻👍🏻👍🏻👍🏻
Great content mate enjoying the S5... and that kit with the Wrap!!! Glorious!!!
Loving the ride Mat. Really weird situation regarding the horsepower issues. Looking forward to the journey with this beast.
Hey Mat, I have the feeling that something with the air mass flow sensor isn't right because this kind of huge PS difference ist often caused by a wrong gasoline air mixture (when there are no other failure messages). So the Lambda error is correlated to that. I would also check the compression on each cylinder. I would also check the turbo for a lack of compression!
Common numbers unfortunately. I have the same vehicle and after picking it up expecting 350 horsepower and it feeling quick I read nothing but 250 for everybody across the board from Factory so they're very overrated. That plus the only way to really get horsepower out of it it's going to be a supercharger I really wish I would have went for the v6.
Check the entire exhaust system. If all good with the engine and sensors my guess is something is blocking exhaust flow. Had this issue on a Porsche 944T I raced.
Hey Mat, really enjoy this series with the s5 👍🏼 how much does this carbon clean with the walnuts cost?
You can find prices on Darkside Developments homepage I believe. If not you can always contact them and ask, they have great customer support :)
You should get an endoscope and look inside each cylinder through the spark plug hole. The 3.2 FSI and 4.2 FSI are notorious for developing scored cylinder walls if they've been on the longlife oil service and beaten on when cold (knowing the history of this car, it probably wasn't babied :/). If there's scoring and a compression test also shows an issue then unfortunately your engine is toast. But let's hope it's only something in the fuel system as others have mentioned.
Unreal video man, you got the music volume perfect in this one :) Also excited to hear how the investigation into the BHP goes!
A set of 20 inch Audi rotar alloys would set it of perfectly
I know this is old, but those s5 rotor wheels are the nicest wheels Audi ever made. Definitely look awesome on this one.
Those injector connections look well dodgy, wrap looks great, love the vid, keep up the good work.
Audi. I owned a 2010 1.8tfsi. All good while it lasted, shat it self at 75,000km. Fill up the oil check the fuel. It’s a pity Audi has such a shit VW motor and DSG transmission. Absolutely crap. Audi Australia where so surprised with the oil consumption issue and didn’t fix. The TT is such a beautiful design. Sold the junk A3 bought a Disco 3TDV6 best move I made. No more oil usage stress. LR3 are the best 4wd ever. Good luck Mat with the Audi. At least you have content for your TH-cam. I feel for the poor souls that have purchased such junk Audi. Good luck and hope you have heaps of 💰
Great vid as always mate, hope you sort the power issue out.
Great looking car.
Mate I can tell you now that wall but blast would not increase it by much. I would say the fuel injectors are the wrong ones for the car that’s why the wiring was butchered probably because the connectors were different. If it’s anything like the bmw you have to have the fuel injectors coded when you upgrade them
Like the Miami blue very much. Well done mate! 👌
Would be cool if you made a video installing a oil catch can to help prevent the carbon build up. Anyway keep up the good work.
Top man for having a go Mat.
Mat I think you should do a Q & A. Love this series👍🏻
The injectors on the S5 are a HUGE HUGE HUGE failure point. They fail ALL the time, usually ending up in catastrophic engine damage. Recommended to replace them ASAP. As for carbon buildup, you will see performance altering buildup on the 4.2L as early as 10K miles. Get the JHM Tune to wake up the car.
Please do more videos in a week! Your videos are wicked
New to the channel , watched all the backlog in a week. Great channel, cracking content and the S5 looks stunning
Seem that you need to check out valves and piston rings within injector, I know it sounds like a bad news but this happens quiet often on such mileage with that engines. might be wrong but I'd start from measuring compression.
that 100bhp could be in the oil. try changing the oil to something else... if you get lard on the tips of your fingers everything feels slippery... cheep oil is considered as vegetable oil, get it on your fingers its slippery for a second or two then the pads of your fingers start to grab each other. try a formulation of Royal Purple w/STP heavy stabilizer to match the oil to the viscosity it needs given its operational conditions. probably going to end up costing $200 with a filter and line flush. those two brands i listed have may additives in them "highly refined in manufacturing", that's why they are so expensive.
Love this series Bud, hope you find the cause for the missing 100hp.
I had that issue last year with my 4.2 S5, except mine seemed to have more symptoms and codes shown. It took about 2 months of guessing and trial and error before I decided to just get all new injectors. A week later, new injectors, plugs, coils, and a carbon clean and my car was running good as new! Hope this helps.
Not killing you for it either, but my injectors were filthy with carbon...
Mat.. S5 looks mint you have done a boss job on the wrap.. dont do too much to it though other than power and brakes lol
Great vid but my God how many times did you clap your hands together! 🤣
Good build so far, really enjoying the videos. Sux about the HP loss. Injector situation seems fishy, maybe the previous owner replaced the injectors with aftermarket and they didn't fit/ connect correctly. Has the lamba code gone away? I'm not sure about this but is it possible it previously had a supercharger or turbo, hence the work near the intake /after market injectors? Possibly check the fuel pressure, lambda sensor, maybe it has some weird tune on it?
Multistage inlet manifold flaps staying open preventing the short path for air as the revs rise? or possibly collapsing cats causing massive restriction. Had the former on my B6 S4 and it felt torquey low down but went flat above 4krpm, vaccum hoses for flap control were perished.
350@crank. You should be making about 275 to the wheels. you are losing HRSPRS, but not as many as you may think. Check those injectors, check your air filter.
Liked before watching 😎
Could be so many things. Injectors would have been easy to check but i understand the situation. If the catalyst is broken/blocked it could kill the power. Also the lambda may have a fault because of that.
Hope you find the lost horses... Great vids... Keep em up!
might be your engine timing chain usually they stretch if you have a broken engine tensioner . only down side to these engines but once work is complete its very reliable. i had a 3.2 v6 suffers similar problem. best to just rebuild engine yourself it isnt as hard to do but requires alot of time.