[s-cars] tales from the dyno

[Joe Pizzimenti]

Sounds to me like there's too much ignition advance there.  The 30R
should push more air there than an RS2, so you may want to dial boost
back a little bit manually to compensate...unless you have another
chipset you can try out.

Joe


On Tue, 19 Oct 2004 18:07:05 EDT, djdawson2 at aol.com <djdawson2 at aol.com> wrote:
> Well, at the tender age of 930 miles, I went and strapped the car onto the
> dyno.  For those who haven't kept up with the changes to the car... it is a
> freshly rebuilt 2.2 using Carillo rods.  No other changes have been made to the
> structure of the engine... no porting/polishing, no big throttle body, no cams.
> In fact, this is a low cost effort.  The turbo and tube EM together cost less
> than current RS2 figures.  The rods were the only significant expenditure.
> 
> The car currently uses a stock IC, and the engine management is fully
> intact... no boost controller.  It has a tube header, a GT30R turbo, and a 3 1/2"
> exhaust from the turbo back.  The exhaust uses 2 mufflers.  I installed the RS2
> MAF, injectors, and ECU using the popular hybrid software.
> 
> The results were interesting...  the car put out 387hp and 413ft/lbs of
> torque.  On a different run, it put out 384/425.
> 
> The engine was plagued with a problem, however.  As both curves were heading
> skyward, the car experienced a "burp" at 4900rpm.  At this point, both torque
> and hp figures dropped by about 30 units, and never recovered.  Observing
> boost, it was clear that the ECU didn't like something that was going on, as the
> boost was drawn back about 10psi immediately (at 4900rpm), from its previous
> 26psi peak, and was never let back above 19psi.  In other words... the engine's
> peak torque and hp were posted right at the "burp," in the midst of a
> previously steady and sharp climb.
> 
> My guess is that I may be running out of injector flow.  Additionally, I've
> heard talk of the RS2 MAF also getting into trouble right around 400hp.
> However, the A/F graph certainly didn't indicate a shortage of fuel.  Possibly an
> out of tolerance intake air temp??
> 
> Either way, the results are encouraging.  Considering the fact that clearly
> an IC is in order, not to mention bigger injectors/MAF/software, I believe this
> engine has quite some room to grow.  Oh the fun!
> Take care,
> Dave in CO (Everboost to be exact)
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