My RS4 dyno numbers...

[zzzzzeke]

Think I've been bitten by the carbon buildup bug.

Car is stock performance-wise (just turned 30K miles)

did 4 pulls on a dyno dynamics dyno this morning. (BP 93 octane)

the lower red line in the charts is without sport mode on.


I am trying to setup an appointment at an independent shop to do a carbon clean.
Then I plan on heading back to the same dyno.

Feedback welcome and appreciated.

MAX HP, MAX TQ


MAX HP, AF ratio



the fourth pull was in shootout mode to simulate dynojet numbers.

[davyboi]

oh my.....
I had carbon buildup on my S5 at 33K.. .got it cleaned....runs like a champ. Never dynoed it

[WinterRunner]

You should be around 290-300, get her cleaned, you won't regret a thing. If you want some advise on how to get a free cleaning from the dealer shoot me a PM. I also noticed you DO NOT have that bump at 5.5K until 7900. Are your vaccuum lines all hooked up correctly? Even with CB, you should still have that curve, regardless of whether or not you have some CB power loss. Somethings up with your RS.......

On a side note, How does a Mustang dyno compare to a Dyno Dynamics? IIRC the dyno dynamics is a bit more optimitic than a Mustang right?


BTW, OP, stop using BP gas.

[Ill 3.0]

The car shouldn't be plateauing around 6400 like that I believe. DD is typically one of the lowest reading dynos so its probably in the 20-30whp range low rather than 50whp low.

[WinterRunner]

The car shouldn't be plateauing around 6400 like that I believe. DD is typically one of the lowest reading dynos so its probably in the 20-30whp range low rather than 50whp low.

Lower than a Mustang?

[mattlqx]

I agree, stop using BP just on principle.

Anyway, yes ,you're lower than you should be. Get a carbon cleaning, it'll be night and day different. Do you notice a slight shudder during WOT in say, 2nd or 3rd during the latter half of the rev range? That was a good indicator on mine.

[B6JoeS4]

BTW, OP, stop using BP gas.

what is wrong with BP? is the gas bad or are you just saying that because of the oil spill thing going on

[WinterRunner]

It's actually very good gas, it's all on principle. If you enjoy seeing millions of gallons of crude oil in the Gulf then by all means continue supporting BP by purchasing their gas.

[mattlqx]

what is wrong with BP? is the gas bad or are you just saying that because of the oil spill thing going on

They're not top tier gas, but more than that, yeah, the whole raping of the environment thing and being unable to stop it should make everyone think twice before pulling into the green.

[WinterRunner]

They're not top tier gas, but more than that, yeah, the whole raping of the environment thing and being unable to stop it should make everyone think twice before pulling into the green.

I was under the impression they were top tier....... Regardless I use Shell exclusively. Fuck BP


EDIT: I guess I was wrong. Yet another reason to steer clear.

[Ill 3.0]

Lower than a Mustang?

Usually. To put it in perspective, a buddy of mine locally had a custom tuned fairly strong Stage III B5 S4 that made 360 whp on a DD. Obviously there are differences even between similar setups but you get a ballpark idea.

[RS4Jay]

From looking at those graphs I'm going to say you have some kind of issue other than carbon buildup. Vacuum leak and/or stuck flappers.

[S4_Artillery]

Are you really giving BP a hard time for destroying the environment when we all drive 4000 lb, 400 HP cars? Really??? Think about it for a minute.

[roxorz]

It's actually very good gas, it's all on principle. If you enjoy seeing millions of gallons of crude oil in the Gulf then by all means continue supporting BP by purchasing their gas.

All you are doing is hurting local business that are using BP's brand name and their employees that have nothing to do with BP corp. Neither have any relation to the spill. Additionally, most of these gas stations are locked into a multiyear franchise agreement, so even if they wanted to, they can't change their name/brand. I know there's a lot of emotion around the spill, and it is truly terrible, but boycotting gas stations just doesn't make sense to me. IMO

[silverRS4]

OP...you have a PM.

As far as the oil spill goes, its a little off-topic and debates here will just mess up a potentially decent thread. BTW, there are rigs in the Gulf owned by other countries (China, etc..) and I guarantee that if one of those had a catastrophic problem, they would just leave the US to clean up after it. True, BP messed up. But at least they are trying to fix it and help clean it up.

[WinterRunner]

All you are doing is hurting local business that are using BP's brand name and their employees that have nothing to do with BP corp. Neither have any relation to the spill. Additionally, most of these gas stations are locked into a multiyear franchise agreement, so even if they wanted to, they can't change their name/brand. I know there's a lot of emotion around the spill, and it is truly terrible, but boycotting gas stations just doesn't make sense to me. IMO

Well it makes perfect sense to me. Like I said before it's all on principle. Would you buy an S4 if Audi was dumping millions of pounds of hard metals (or equivilent) into the ocean? I mean the dealership obviously doesn't have anything to do with it but it's still happening......... Would you support that too? Because despite your arguement, a percentage of the money is going right to BP..... It's been 3 fucking months already.

On the 400 HP V8 car, yea this is true to an extent, but I also daily drive a 4 banger so that offsets the issues. Not to mention the fact that the comparison of one V8 and it's emmisons are hardly on par with MILLIONS of gallons of crude oil floating around the gulf, literally destrying all oceanic life it comes in contact with......

[zzzzzeke]

BTW, OP, stop using BP gas.

I would love to use something like Shell, but there doesn't seem to be any Top Tier gas stations in my city.

http://www.twincitiesgasprices.com/i...e&dl=Y&intro=Y

[zzzzzeke]

Do you notice a slight shudder during WOT in say, 2nd or 3rd during the latter half of the rev range? That was a good indicator on mine.

I don't notice any shudder, but definitely don't feel the "surge" of power around 6K+ RPM I used to.

[zzzzzeke]

Stopped by the local dealership over lunch. talked to the service manager. pretty defensive about carbon buildup claims, but either way they will look at the car next tuesday. if they are going to propose the "procedural" fuel additive crap, I'm just going to pay out of pocket to get it cleaned (possibly elsewhere).

[scmguru]

Looks like stuck tumble flap.. or vacuum leak to the tumble flaps.

[WinterRunner]

I honestly think it's both. Carbon would not affect the 6k surge..... You would be down on power but still have that ramp up at 6K+. I would suggest checking for any vaccuum leaks or a stuck tumble flap like others have pointed out.

[M.S4]

Top tier is just a GM owned campaign...

IP Address / Domain Name Lookup:

Registrant:
Domain Name Administrator
General Motors Corporation
300 Renaissance Center Mail Code 482-C23-B21
Detroit MI 48265-3000
US
[email protected] +1.3136654967 Fax: +1.1111111111

Domain Name: toptiergas.com

[WinterRunner]

Ha^^ thats funny.

[ArthurPE]

not carbon
check the intake flaps, there is an SIB out on them
symptoms are exactly like yours, flat >5500

do me a favor
using the OBC lap timer
do some accel runs in 3rd gear, 3k to 8k rpm (36 tp 96 mph)
do 3 runs noting
temp
fuel load
elevation
passenger?
etc.

before and after the service visit

after more review, the dyno seems goofy too, only 217 lb-ft down low?
carbon will have zero impact <5000 rpm, and only a few % above that in extreme cases...
<5000 airflow is so slow that no power would be loss due to pressure drop/obstruction, yet your torque should be ~270-280 at 4000 yet is only 220

[zzzzzeke]

just for kicks, here is a crappy video taken with a point & shoot.

[roxorz]

just for kicks, here is a crappy video taken with a point & shoot.

Needs coilovers, exhaust and wheels. :)

[94jedi]

geeez, I know I'm just beating a dead horse here but carbon build up or not, a car rated at 414 a the fly should put out more than 290-300 at the wheels...although, I guess 25% or more parasitic loss for Quattro is about right. I don't know...it just doesn't seem right to me. I love RS4's though...

[Keith@APR]

Let's get back to this BP thing for a minute....

What other catastrophic oil spill in the history of mankind do we have to compare BP's efforts to?

How many natural disasters to date have been caused by our quest for energy?

Once you answer those 2 questions I think it will help to put into perspective how lucky we have been so far and how inconsequential this spill really is and how its damn near impossible to blame BP for anything since there is absolutely no technological or operational precedence in our history to address such an issue as a large scale oil spill from a drilling accident.

If you really want to help, don't stop using BP, stop using energy all together. Or buy a Prius and actually damage the environment more than most gas cars do and feel like you are helping and gather an air of arrogance for doing so.

On topic....

In my experience, DD read lower than just about anything besides a Mainline or MAHA wheel numbers. We do a lot of testing with DD's in Oz and I am always trying to get the numbers back to normal USA type numbers. The DD's just read really low.

[roxorz]

Let's get back to this BP thing for a minute....

What other catastrophic oil spill in the history of mankind do we have to compare BP's efforts to?

How many natural disasters to date have been caused by our quest for energy?

Once you answer those 2 questions I think it will help to put into perspective how lucky we have been so far and how inconsequential this spill really is and how its damn near impossible to blame BP for anything since there is absolutely no technological or operational precedence in our history to address such an issue as a large scale oil spill from a drilling accident.

If you really want to help, don't stop using BP, stop using energy all together. Or buy a Prius and actually damage the environment more than most gas cars do and feel like you are helping and gather an air of arrogance for doing so.

On topic....

In my experience, DD read lower than just about anything besides a Mainline or MAHA wheel numbers. We do a lot of testing with DD's in Oz and I am always trying to get the numbers back to normal USA type numbers. The DD's just read really low.

Keth, well put. The reason these companies are drilling almost 1 mile below surface of the ocean is because we are running out of other places to drill. It's getting harder & harder to get oil out of the ground.
So what's my solution to this complex energy problem? I think everyone else should buy an electric vehicle or a hybrid. Reduce the demand, and my gas will be cheap and plentiful. I'll keep my gas guzzler and be happy :)

[Tweety-s-]

Think I've been bitten by the carbon buildup bug.

Car is stock performance-wise (just turned 30K miles)

did 4 pulls on a dyno dynamics dyno this morning. (BP 93 octane)

the lower red line in the charts is without sport mode on.


I am trying to setup an appointment at an independent shop to do a carbon clean.
Then I plan on heading back to the same dyno.

Feedback welcome and appreciated.

Sorry
Do you know in wich week was the car produced in 2007??? I need to know if is before or after the 20th week.

[zzzzzeke]

Sorry
Do you know in wich week was the car produced in 2007??? I need to know if is before or after the 20th week.

might be a stupid question, but where would i find this information?

[Tweety-s-]

On the service manual of the car, you should have written the Year and week of production

[ArthurPE]

Sorry
Do you know in wich week was the car produced in 2007??? I need to know if is before or after the 20th week.

what does that have to do with it?
what changes occured that would impact carbon deposition

build date can be found; drivers door, lower grey sitcker, first digits eg 10/07, Oct 2007, this will get you close, I'll have to check my manual

[RS4Jay]

might be a stupid question, but where would i find this information?

Should be on the white sticker in the lower drivers side door jamb.
Tweety - what is the significance of the production date?

[zzzzzeke]

what does that have to do with it?
what changes occured that would impact carbon deposition

i was wondering the same thing. i couldn't find any dates in the service manual (build or in service).

[zzzzzeke]

Should be on the white sticker in the lower drivers side door jamb.
Tweety - what is the significance of the production date?

found it. 10/06

[ArthurPE]

just checked mine...
door sticker 2/07
maint. book build sticker 2/07
vehicle data printout from the Audi service system: production date 3/13/07

[scmguru]

what is wrong with BP? is the gas bad or are you just saying that because of the oil spill thing going on

BP aka Arco in Southern California is probably the worst gas out there..

[B6JoeS4]

You can track and see what BP is doing in the gulf here.....

http://www.bp.com/extendedsectiongen...tentId=7061813

[Tweety-s-]

apparently Audi RS4 engines from build date CW20/2007 received a altered cylinder head with different piston rings, and "some" say that with that they solved the problem. I personaly don't belive it... Also because serial numbers of spares parts are exactly the same. BUT i'm trying to find an RS4 that was produced after the 20th week (so after mid May) and has same CBU problems.