Soo.. RS4 Dyno'd.. Not-so-good.

[mattlqx]

First thing is first. I got my RS4 about two weeks ago. It has 12k miles on it. I love the car as I have my other B7's. This one is obviously the fastest. It's an impressive Audi for sure.

The gents at GoodSpeed Performance here in AZ took some time to tune it today. If you don't know about them and their shop, they're a quality performance and tuning shop that specializes in German and Japanese vehicles. Their dyno is a MaHa LPS 3000. The MaHa is an impressive beast. It can accurately calculate drivetrain loss and thus give you an actual crank HP number. It also takes environmental factors into account. In short, the dyno works and I trust it.

This car is stock aside from the tune and runs were done with 91 octane fuel. The baseline run was done at 10am and best run with the final tune was at 8pm. And now the results...

Stock, an RS4 doesn't do 420hp, it doesn't even do 414hp. It's far short at just under 375hp at the crank. A little disappointing. I'm a little perturbed that it's missing roughly 10% of factory quoted HP. That said, it doesn't change the fact that the car hauls. It doesn't make it slower knowing what it's really making and I still love the car. I just wish it Audi didn't pad their V8 numbers so much.

I'm not trying to start a flame war either but I'm curious if others were aware of the short-fall. I haven't seen this discussed before. I'm told the S4 V8 is similarly padded and a shop in the east (forget the name) has even gone so far as to take an S4 engine out and take it to an actual engine dyno which led to similar results (a good chunk less HP than quoted factory).

As one more side-note, GS has had a new M3 on the dyno and it was almost spot on (407hp vs 414hp factory number).

Now! About the tune... they did a good job with it. No speed limiter (not that I'm anxious to go faster than 135 anytime soon), redline increased to 8500rpm and, most importantly, a smoother curve and a small HP gain. The HP gain looks to be 12hp, which isn't bad for an NA engine. The last 1000 or so rpm you can really see the difference.

Now, the chart:



And finally, the rather mundane video of it on the dyno:

YouTube

[lrg8683]

that sucks. audi needs to be over compensating with power since the cars are so heavy... but the car is uber nice.. i remember that white rs4 that only dynoed at like 277 whp..

[poopypants]

Your AWHP seems super low. Ive seen modded B6 S4 numbers higher than that. If im not mistaken, you should be like over 330 AWHP. Seems like the tuning went bad because that is a huge power decrease.

[Redux]

My car came in at around 320 on a Dynapack and then 360 on a DynoJet about two weeks later. I just don't think anyone can figure out the drivetrain loss on our cars.

Side Note:
I can hang with a friends chipped 335 until 80ish mph... after that.... I just see tail lights

[Howard Hughes]

Your AWHP seems super low. Ive seen modded B6 S4 numbers higher than that. If im not mistaken, you should be like over 330 AWHP. Seems like the tuning went bad because that is a huge power decrease.

How could it be the tune when he is talking about the baseline dyno pull?

Please read.

[KryptoniK]

hmmm that is odd.... I have done dyno runs of my B7 S4 and RS4 on the same dyno as you here in New Jersey @ KMD. They were def. not that low at all.


Here is the 2005.5 S4 Dyno run with the mods listed on the chart:





Here is the 2008 RS4 Dyno run with the mods listed in the chart: The first one is without the Revo flash, the second one is with it turned on:







I honestly don't know what to think about your dyno numbers... maybe there is actually something wrong with your car and it's not performing as well as you think it is. Valve deposits maybe?

[Justincredible]

Mrperfict...Love the name by the way..

All I have herd in the past is that the RS4 is not a 400+ car. But in fact that it is a 375...I have herd this from several family members back in Germany. The R8 dose have the 400+ motor and the difference is in the intake manifold and if you look at it logically how dose the RS4 make the same power as the R8 when the R8 has 2 throttle bodies and the RS4 only has one. Not only dose it have just one but intake is obviously smaller.

As for the Dyno #'s don't worry too much about them but it dose sound like your car is falling in line with where it should be. So comparing your power to power made on another dyno is just going to be super hard to compare. It seems with dyno #'s unless we all meet up and dynoed on the same day on the same dyno you are going to get super skewed info...

Any way thanks for sharing and great job either way

[KryptoniK]

All I have herd in the past is that the RS4 is not a 400+ car. But in fact that it is a 375...I have herd this from several family members back in Germany. The R8 dose have the 400+ motor and the difference is in the intake manifold and if you look at it logically how dose the RS4 make the same power as the R8 when the R8 has 2 throttle bodies and the RS4 only has one. Not only dose it have just one but intake is obviously smaller.

Not true, explain this:



The numbers are almost identical between the RS4 and R8.



On the MAHA Dyno, I did 300 awhp when the car was STOCK. Other RS4's on the same dyno have done about 295-305 stock. That is an acceptable variation depending on different weather conditions and all. Now being at 275 awhp on the same brand dyno while others are averaging around 300 doesnt seem right. Something must not be running smoothly with the car.

[SuperAvant]

The only thing I can think of is that when a dyno is set up for tuning, there is a bigger resistance placed on the drums. I had this happen when I dyno'd my car after a club's tuning session. Since they tuned your car and dyno'd, perhaps this is your issue?

[Bpitz15]

Is it 135 degrees in Tempe already??

[Papachristou]

b6a4s with BTs are putting down more than that, and BATs are now putting down close to 400AWHP...... id be pissed if i spent $80k on a car and lost to 335i or dyno'ed under 300awhp

of course, you still have a rs4 and i have a a4

[SuperAvant]

b6a4s with BTs are putting down more than that, and BATs are now putting down close to 400AWHP...... id be pissed if i spent $80k on a car and lost to 335i or dyno'ed under 300awhp

of course, you still have a rs4 and i have a a4

You could spend 400K on a Rolls and still lose to a 335. No stock 335 will be beating an RS4. But lets not make this thread one of those again.

[NewImageS4]

b6a4s with BTs are putting down more than that, and BATs are now putting down close to 400AWHP...... id be pissed if i spent $80k on a car and lost to 335i or dyno'ed under 300awhp

of course, you still have a rs4 and i have a a4

He didn't pay 80k for an 07 RS4 with 12k on it.

I didn't even pay close to that for mine brand new...

[Papachristou]

ok... we are splitting hairs about money here, the point was id be pissed if i spent a lot of money on a rs4 and it dyno'ed that low....

someone just posted that a 335 walked him after 80mph......

[QTC]

I think something's not right with your car. Hell, my car on a MAHA makes more torque than you do, and I'm only chipped. Plus comparing Kryptonik's dyno (also on a MAHA) to yours, there are significant differences that (imo) can't be attributable to the hotter temp. I hope its not valve deposits or somehting like that.

[drew]

dude you got dynoed on the MAHA aka the heartbreaker....lol

mahas read super low

[RAudi Driver]

335's are super fast when chipped. I wouldn't worry about it. The RS4 or an Audi in general isn't just about speed.

[mattlqx]

hmmm that is odd.... I have done dyno runs of my B7 S4 and RS4 on the same dyno as you here in New Jersey @ KMD. They were def. not that low at all.

Here is the 2008 RS4 Dyno run with the mods listed in the chart: The first one is without the Revo flash, the second one is with it turned on:


I honestly don't know what to think about your dyno numbers... maybe there is actually something wrong with your car and it's not performing as well as you think it is. Valve deposits maybe?

Hm. Interesting. I believe the shop that I was talking about is KMD. The temps are about 30 degrees cooler on your runs but I can't imagine it'd have that severe of impact. Were you running 93 or 100 for that run? Also curious why they stopped your runs just before 7500 rpm.

Did they touch anything engine related on the 2008s I wonder?

Obviously, I don't want to believe there is something wrong with my car in particular. Especially if others have said the same thing about HP being low. But if it is, then it is.

[drew]

find another stock rs4 in phoenix and do a couple pulls.

forget about dyno numbers. wayyy too many variables. you will go crazy for nothing.

[mattlqx]

Is it 135 degrees in Tempe already??

I think we'd be melting if that was the case, but yeah, it's inching closer to 100.

[mattlqx]

I think something's not right with your car. Hell, my car on a MAHA makes more torque than you do, and I'm only chipped. Plus comparing Kryptonik's dyno (also on a MAHA) to yours, there are significant differences that (imo) can't be attributable to the hotter temp. I hope its not valve deposits or somehting like that.

Would valve deposits really rob HP like that? My impression of that was that it could cause misfires and when it does, you'll get a CEL. Haven't gotten any of those yet. Checking for valve deposits doesn't sound like an easy process either. :\

[Bpitz15]

I think we'd be melting if that was the case, but yeah, it's inching closer to 100.

I know I went to ASU so I know about the 114 degree days.
Could the heat have that big of a factor on the performance?

Edit: Just read post #18

[sway]

I know I went to ASU so I know about the 114 degree days.
Could the heat have that big of a factor on the performance?

Edit: Just read post #18

You have more pics of your car with the new/different wheels?

[405Z]

Mrperfict...Love the name by the way..

All I have herd in the past is that the RS4 is not a 400+ car. But in fact that it is a 375...I have herd this from several family members back in Germany. The R8 dose have the 400+ motor and the difference is in the intake manifold and if you look at it logically how dose the RS4 make the same power as the R8 when the R8 has 2 throttle bodies and the RS4 only has one. Not only dose it have just one but intake is obviously smaller.

As for the Dyno #'s don't worry too much about them but it dose sound like your car is falling in line with where it should be. So comparing your power to power made on another dyno is just going to be super hard to compare. It seems with dyno #'s unless we all meet up and dynoed on the same day on the same dyno you are going to get super skewed info...

Any way thanks for sharing and great job either way

Look at 1/4 mile trap speeds for the R8 and RS4. They are very close and the RS4 is heavier, so there is no way it is making significantly less power than an R8. Similarly, with a 3800+ lb car trapping at close to 110 mph, there is no way a stock RS4 only makes about 375 bhp at the crank.

[KryptoniK]

Hm. Interesting. I believe the shop that I was talking about is KMD. The temps are about 30 degrees cooler on your runs but I can't imagine it'd have that severe of impact. Were you running 93 or 100 for that run? Also curious why they stopped your runs just before 7500 rpm.

Did they touch anything engine related on the 2008s I wonder?

Obviously, I don't want to believe there is something wrong with my car in particular. Especially if others have said the same thing about HP being low. But if it is, then it is.

Ah yes I didn't even pay attention to the temp differences. Still not sure if it would make that much difference. Maybe elevation factors in?

I ran 93 octane on all of the dyno runs, and all the time period.

They didn't stop the runn at 7,500, they told me they only displayed up to 7,500 because after that rpm the power starts to die down more or less, as you can see in your chart that is up to 8,500.

Well from 2007 to 2008 maybe the factory ecu tune is a little bit different. I had mine updated to the most recent one from Audi before I did the dyno pulls on those charts. Do you know if Audi has your ecu flashed to the most recent update?

About valve deposits. From my understanding, it's not only until it's really bad that you will start to get excessive amounts of misfires that will throw the CEL. You can still have valve deposits forming without a CEL and lose performance. You don't need to remove the intake manifold to find this out, they have special "tube" camera probes they can snake into the manifold and inspect.

At the end of the day I don't really care about my final dyno #, just the difference from stock #s to modified, and from my mods I got a 20-25 awhp gain.

It's all relative really, like someone said before me, have another RS4 dyno on the same day with you and see what comes up. If you're both in the same range it might be that the dyno just throws out lower numbers.

[KryptoniK]

b6a4s with BTs are putting down more than that, and BATs are now putting down close to 400AWHP...... id be pissed if i spent $80k on a car and lost to 335i or dyno'ed under 300awhp

of course, you still have a rs4 and i have a a4

Typical A4 mentality. Although you corrected yourself in the last phrase (don't mean that to sound cocky or snobby)

Like someone posted before, lets not start this conversation again about how RS4/S4 owners should feel ashamed for spending so much money on a car that gets beat by cars that cost pennies. There is really a lot more to cars than just speed/power.

Plus, what good is a 335i with all that whp when it's ONE wheel drive... yes one wheel drive, it has no LSD. What a waste of power transfer.

[imports]

Plus, what good is a 335i with all that whp when it's ONE wheel drive... yes one wheel drive, it has no LSD. What a waste of power transfer.

they do pretty good on the track and drag times and they have XI to yah know.

[Das General]

Doesn't surprise me. I pulled on my buddies when I had a Giac tune and a cat-back.

[Redux]

meh.... none of this will matter if VF Engineering gets close to ______ at the wheels

[ChronicTeutonic]

you had ESP off, right?

[bitjockey]

For what it's worth, I've never seen an RS4 do over 320whp on *any* dyno on 91 octane fuel.

[AofC_RR]

they do pretty good on the track and drag times and they have XI to yah know.

Also known as X-fail. X-drive is crap. You can't lower the car without putting stress on the whole drivetrain, hence no factory sport suspension. And I'd hate to see what big power would do to the drive shaft running through your oil pan.

[jerrym]

You have the to remember.. dyno is just numbers.. not always correct.

[b6onboost]

RS4...on 91 octance, 94 deg outside, on a Maha...doesn't suprise me the numbers are low. Put that same car on a dynojet with 93 oct and cool weather and you'll see a big difference.

Bottom line...it's still and RS4. It's still fast. You just picked the wrong dyno and conditions to get numbers that make you feel good.

[scotty607]

Just for the record. I spanked a 335 coupe on the hway. I had 4 guys in my RS4 and I let him go 1st after just playin around with him in my rear view mirror. So he gunned it and then I blipped third and stopped his charge by holding him to a half of car and then I slowly went by him in 4th and then put a car length in 5th. That car is quick, but it cannot beat an RS4.

[mattlqx]

you had ESP off, right?

That's a good question. I would imagine so but I'd have to double check. Especially since there are three ESP modes on this car.

[mattlqx]

RS4...on 91 octance, 94 deg outside, on a Maha...doesn't suprise me the numbers are low. Put that same car on a dynojet with 93 oct and cool weather and you'll see a big difference.

Bottom line...it's still and RS4. It's still fast. You just picked the wrong dyno and conditions to get numbers that make you feel good.

Yeah, if I wanted fake numbers, I'd put it on a DynoJet and feel much better that my car suddenly had 500whp. ;)

Apples-to-apples on the same dyno would be the way to see if my car has some issues. Perhaps I'll see some other RS4s at the ACNA event in Scottsdale tomorrow. We'll get this hammered out one way or another.

[Justincredible]

Not true, explain this:



The numbers are almost identical between the RS4 and R8.

You would definitely know more then I would you have a RS4 but from EVERYTHING I have herd the RS4 has less power then the R8. The automobilemag dyno. I don't think they did dyno runs with the car I think they are posting public release info one over the other. Altho your info seems to put most of the doubt to bed with your #'s

Like I said you are going to know more then me. It just strikes me as odd the the R8 would need a different intake manifold with 2 throttle bodies to make the same HP as the RS4. Not only that but the R8 has a dry sump oil system. That is straight out of Race car tech. The RS4 has a pump drive wet sump like our cars. With these 2 MAJOR differences I don't know why they would go threw all that for the same power they could have gotten by not doing it. These differences DON"T mean that my thoughts are correct just that something doesn't make lots of sense (to me)

Then to have people say that the RS4 supposedly has less HP just got me thinking. The dyno info the fella posted just seemed to come in line with MY THOUGHTS collected from word of mouth (not the best source always but)

Look at 1/4 mile trap speeds for the R8 and RS4. They are very close and the RS4 is heavier, so there is no way it is making significantly less power than an R8. Similarly, with a 3800+ lb car trapping at close to 110 mph, there is no way a stock RS4 only makes about 375 bhp at the crank.

GOOD point BAD research (well maybe not bad but incomplete).....The RS4 has a 4:11 gear the R8 has a 3:42 So This shows that there is a disparity

[sakimano]

b6a4s with BTs are putting down more than that, and BATs are now putting down close to 400AWHP...... id be pissed if i spent $80k on a car and lost to 335i or dyno'ed under 300awhp

of course, you still have a rs4 and i have a a4

ok... we are splitting hairs about money here, the point was id be pissed if i spent a lot of money on a rs4 and it dyno'ed that low....

someone just posted that a 335 walked him after 80mph......

?

[1FastS4.Com]

Here is mine stock with Milltek only
330hp and 259tq