[Biturbos4] s4 power output

Quincy Chiang b5quattro at shaw.ca
Wed Mar 24 13:28:54 EST 2004

>From reading numerous discussions on AW, it seems that the consensus on approximate quattro drivetrain loss is about 28%.  So your dyno results of ~220 whp is about right:

220whp/305hp = 0.7213 (72.13%)
loss = 1 - 0.7213 = 0.2787 (28.87%)

I believe this aproximation is based on the dyno result of 180 whp on North American  spec 150 hp S4's.

One more thing, these are peak numbers, so it doesn't really tell you how fast your car should or shouldn't be.  Because the 2.7t has so much torque down low, the car will accelerate faster the what merely 220hp suggests.


----- Original Message -----
From: David Lau <toomanycars at mac.com>
Date: Wednesday, March 24, 2004 8:08 am
Subject: Re: [Biturbos4] s4 power output

> I too was disappointed at the dyno. The Red Wagon is APR chipped 
> also. I can
> check my numbers tonight, but from memory but I think it was 
> closer to 220
> at the wheels from a similar 300bhp rating. Appears the quattro, 
> while great
> for many things, is somewhat of a power hog. Since my APR is 
> programablefron the drivers seat, I ran 3 pulls on the 3 different 
> programs, and the
> DIFFERENCE between stock mode and chipped was evident.
> DL
> -- 
> David J. Lau, The Brookwood Studio, Inc.  David at brookwoodstudio.com
> Subject: [Biturbos4] s4 power output
> Can anyone see from the plot if there is anything obviously wrong? 
> Does the
> boost look reasonable for a stage 1 chip?  Or am I just expecting 
> too much?
> I'd appreciate any help or comments you can give me - seems this 
> car is
> destined to keep me worrying some more.
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