STILLEN 370Z Supercharger System - Announcement!!!

Originally Posted by Phimosis

Tom, have you ever had a tune that
has good driveability? I've seen your complaints about driveability and peak hp
with the newer tunes not delivering as well in the upper rev range. What I'm thinking is that if they have given you a tune that drives well, just stick with that, regardless of the peak hp number.

At 400 whp and 15% powertrain losses, you're making 470hp. That's stil 127 hp/liter. In the big scheme of things, this supercharger does work. At 127 hp/liter, that's like getting 635 hp put of a mustang or 787 hp out of a camaro. Basically, the only engines that are making the same power per displacement are cars with factory F/I and lowered compression ratios. Despite what their press release said, i don't expect them to squeeze this engine much tighter without something popping.

Since GTM was more optimistic in their press release, advertising 452.1 whp with their stage 1 kit at 8 psi boost, let's crunch their numbers: 462 whp with 15% drivetrain loss is 532 hp, or 143.75 hp/liter. That's a higher specific output than an F430 scuderia (118 hp/l), Lexus LFA (115 hp/l) or a ZR1 (102.9 hp/l). 530 hp is the same as the $190k GT2 with similar sized engine. Did they really expect to be in GT2 territory with an 11.0:1 engine and a supercharger?
My point is that your expectations are a little too high and if they can get you a tune that performs smoothly, you really are getting your money's worth.