[s-cars] More dyno results

[jpb3wvu at frontiernet.net]

Ahh the suspense!  I am going to guess 5% gain.

Now please tell me whether the Stromung is worth more than just a
sweet note!

John


> ----- Message from Djdawson2 at aol.com ---------
>     Date: Tue, 14 Sep 2004 01:09:08 EDT
>     From: Djdawson2 at aol.com
> Reply-To: Djdawson2 at aol.com
>  Subject: [s-cars] More dyno results
>       To: s-car-list at audifans.com
>
> Today we spent some time testing the lightly modified S4
> again.  For those of
> you who read the last round, you're aware that we tested a car
> equipped with
> the RS2 EM, injectors, MAF, and software, along with the ITS
> RS2 killer turbo.
>  The RS2 killer did not fare well against the RS2 turbo.  It
> did make 12 more
> peak hp, but the cost was power delivery that was delayed
> about 650rpm, and a
> torque peak that was 30ft/lbs shy of the RS2.
>
> We decided that we needed to experiment with a different
> turbo.  Our goals
> were pretty straightforward:
> 300+ hp ATW
> 400 ft/lbs of torque
> Power delivery similar to, or sooner than the RS2
>
> We based our new turbo on the 46 trim Garrett.  The results
> were not quite
> what we had hoped for, but better than the RS2 killer by a
> significant margin.
>
> Peak hp came in at 323, only 2 short of the RS2.  Peak torque,
> however, was
> 367ft/lbs.  This was well short of our goal, and 35 less than
> the RS2
> delivered.  While power delivery was about 400rpm sooner than
> the "killer," it was
> still 250rpm later than the RS2.  So, by and large, this is
> still not the perfect
> solution... but a significantly improved solution over the RS2
> killer.  Bottom
> line... the standard RS2 turbo ain't too easy to kill.
>
> Other tests we ran:
>
> We dynoed the engine in a "stage 1" format.  The engine was
> still fitted with
> the RS2 EM, and the 46 trim Garrett.  The injectors and MAF
> were replaced
> with the stock units, and the ECU was swapped with a typical
> stage 1 unit,
> producing about 20psi of boost.  This setup yielded a very
> respectable 298hp, and
> 323ft/lbs.  Not bad for just a turbo and EM.
>
> Our final test was done with the full RS2 setup.  Our goal was
> to see what
> gains might be expected by improving the exhaust system.  The
> car in this
> configuration had previously recorded 323hp/367ft/lbs with a
> full stock exhaust.  We
> removed the car from the dyno, and then disconnected the
> entire exhaust
> system.  The only element in place was the downpipe... and
> yes, it was loud.  Our
> theory was that it would be pretty difficult to build any
> system that would
> flow as freely as only the downpipe.  Why not see what the
> engine would gain by
> running wide open?
>
> This is where class participation begins.  Since everyone has
> been happily
> speculating on the "turbo spool" issue, I'm curious to hear
> what speculation
> exists concerning the Audi stock exhaust system.  As soon as
> we have 10 guesses,
> I'll post the results.  Doesn't that suck?  I just want
> opinions....  Anyone?
> (NOT Hap or Mike Pederson please!!)
> Take care,
> Dave in CO
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> ----- End message from Djdawson2 at aol.com -----