That's correct dyno packs will yield more HP that what's actually being put on the ground. Why is 18% drivetrain loss incorrect for RWD. What would you say a better percentage is, and i'm not speaking about dynopacks i'm only refering to general flywheel to WHP and how to get an estimate of WHP from the flywheel HP? If the pre 06 cars mades 230 plus or minus to the wheels why is it so hard that the "new 300 hp motor" makes 245 +- Now about doubting the 20+ whp from the re-flash that i understand but then again this was ona dyno pack.

 

this makes me depressed pepole with mods don't hit numbers like that. I guess the 06 is awesomely tuned.

 

A dyno serves as a guide through your modifications. In this aspect you get a baseline before modifications then continue to go to the same dyno with similar humidity and temperature, tires inflated the same, removing as many variables as possible. THe only legit way to gauge your car against another is a 'Dyno Day' where back-to-back tests are performed.