[s-cars] tales from the dyno

[Djdawson2 at aol.com]

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)