Do heads need to flow for a supercharger?

[Blown353]

The heads will definately benefit from work, especially on the exhaust side, since you now have a much greater volume of exhaust to expel. Go for as great of an I/E ratio as you can and concentrate most of the work on the exhaust side, but by all means don't forget the intake ports! Better flowing intake ports mean less backpressure for the supercharger to work against; this is a benefit and will make more power.

Throttle body isn't as much of a concern, since you'll be shoving air through it. Same rules applies as for N/A motors, as you go smaller the response will increase as velocity goes up. Don't go too huge, but don't go too small either. I'm running a 75mm monoblade on my setup and throttle response is phenomenal when the engine is under load. With the TPIS miniram I'd venture to say a 52mm (780 cfm) would be OK for up to 750hp and probably more, but a 58mm (1000 cfm) wouldn't hurt much either. I wouldn't go bigger.

Also, if you want to see the maximum benefits expect to do a SC-specific cam swap for your "stage 2"; a SC-specific cam will build boost sooner as they typically have wider LSA's and less overlap than N/A cams.



Troy