Originally Posted by VitaRenovatio

I'd like to compete in NASA TT4 next year, with a WT/PWR limit of 12:1. I'm expecting a race weight of 2700 lbs with driver, so that allows me 225 average HP, or probably closer to 235 WHP. I have an 2003 F20C, and I'm putting down around 190 WHP (at Salt Lake City elevation of 4500 ft). That means I can have 45 more WHP and still be legal. I'm thinking the cheapest and most reliable way to do that is with a supercharger. I was wondering if anyone had any suggestions for a low-boost (3-4 PSI) supercharger that can take track abuse all day long?

Thanks in advance!

Originally Posted by s2000Junky

This is not a common set up, the OP would be virtually on his own to construct the system to employ this approach and IF he was successful at it, the power band would be really thin, plus the added weight would negate a sizable portion of the gains made along with the detriment to the handling and breaking of the car which is just as important on the track as power. With a standard base 6psi supercharger kit, the system starts to produce positive pressure ( 1psi) at about 4000rpm and progressively doubles that pressure every 2k rpm or so, until it reaches 6psi at redline, so with a base kit there is little power produced bellow normal vtec range (ie 10whp 6trq) until about 6k rpm, at which point you are starting the need to cap it off to not exceed 235whp because the kit if left alone would make close to 300whp in that upper range, all wile adding 80lb to the car to carry throughout. Its an extremely inefficient way to go about adding 30-40whp and wont be cheap I might add. Basically what I'm saying is it will have much the same power curve as a bolt on NA car but add 80lb.

Originally Posted by michaelnyden

This is not a common set up, the OP would be virtually on his own to construct the system to employ this approach and IF he was successful at it, the power band would be really thin, plus the added weight would negate a sizable portion of the gains made along with the detriment to the handling and breaking of the car which is just as important on the track as power. With a standard base 6psi supercharger kit, the system starts to produce positive pressure ( 1psi) at about 4000rpm and progressively doubles that pressure every 2k rpm or so, until it reaches 6psi at redline, so with a base kit there is little power produced bellow normal vtec range (ie 10whp 6trq) until about 6k rpm, at which point you are starting the need to cap it off to not exceed 235whp because the kit if left alone would make close to 300whp in that upper range, all wile adding 80lb to the car to carry throughout. Its an extremely inefficient way to go about adding 30-40whp and wont be cheap I might add. Basically what I'm saying is it will have much the same power curve as a bolt on NA car but add 80lb.

Originally Posted by s2000Junky

This is not a common set up, the OP would be virtually on his own to construct the system to employ this approach and IF he was successful at it, the power band would be really thin, plus the added weight would negate a sizable portion of the gains made along with the detriment to the handling and breaking of the car which is just as important on the track as power. With a standard base 6psi supercharger kit, the system starts to produce positive pressure ( 1psi) at about 4000rpm and progressively doubles that pressure every 2k rpm or so, until it reaches 6psi at redline, so with a base kit there is little power produced bellow normal vtec range (ie 10whp 6trq) until about 6k rpm, at which point you are starting the need to cap it off to not exceed 235whp because the kit if left alone would make close to 300whp in that upper range, all wile adding 80lb to the car to carry throughout. Its an extremely inefficient way to go about adding 30-40whp and wont be cheap I might add. Basically what I'm saying is it will have much the same power curve as a bolt on NA car but add 80lb.

Originally Posted by michaelnyden

This is not a common set up, the OP would be virtually on his own to construct the system to employ this approach and IF he was successful at it, the power band would be really thin, plus the added weight would negate a sizable portion of the gains made along with the detriment to the handling and breaking of the car which is just as important on the track as power. With a standard base 6psi supercharger kit, the system starts to produce positive pressure ( 1psi) at about 4000rpm and progressively doubles that pressure every 2k rpm or so, until it reaches 6psi at redline, so with a base kit there is little power produced bellow normal vtec range (ie 10whp 6trq) until about 6k rpm, at which point you are starting the need to cap it off to not exceed 235whp because the kit if left alone would make close to 300whp in that upper range, all wile adding 80lb to the car to carry throughout. Its an extremely inefficient way to go about adding 30-40whp and wont be cheap I might add. Basically what I'm saying is it will have much the same power curve as a bolt on NA car but add 80lb.

Originally Posted by s2000Junky

This is not a common set up, the OP would be virtually on his own to construct the system to employ this approach and IF he was successful at it, the power band would be really thin, plus the added weight would negate a sizable portion of the gains made along with the detriment to the handling and breaking of the car which is just as important on the track as power. With a standard base 6psi supercharger kit, the system starts to produce positive pressure ( 1psi) at about 4000rpm and progressively doubles that pressure every 2k rpm or so, until it reaches 6psi at redline, so with a base kit there is little power produced bellow normal vtec range (ie 10whp 6trq) until about 6k rpm, at which point you are starting the need to cap it off to not exceed 235whp because the kit if left alone would make close to 300whp in that upper range, all wile adding 80lb to the car to carry throughout. Its an extremely inefficient way to go about adding 30-40whp and wont be cheap I might add. Basically what I'm saying is it will have much the same power curve as a bolt on NA car but add 80lb.

Originally Posted by Chuck S

I have 221bhp at the rear wheels (at 1100 feet ASL) with just buy-anywhere intake an exhaust. I'd think another 15 would be easy with custom work. Perhaps a Gernpipe exhaust? Not sure about 4500 feet ASL though.

-- Chuck