Smart quod bastardus
Join Date: Oct 2002
Location: Baltimore, MD, USA
Posts: 2,233

Stock compression for a 3.3 is 7.0 to 1.
You know what would be great is for a survey of a few users that have dynoed their cars and see if we could back into the efficiency ratings for each case to get a feeling for what it should be once we average all the results. This is just a guess for now without real data to back it up.
I had my completely stock 3.3 dynoed at 249 hp at the wheels at 5500rpm....
For example
1) doing the math yields: 249hp * 1/.88(12% loss at drivetrain)= 282hp at the crank.
2) using the chart on the site and assuming intercooler efficiency of 75% and a turbo efficiency of 60%yields:
ENGINE EFFICIENCY of 76%......not too bad.
Anyone else got some results to post?
