B18c or B16a?

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Originally Posted by saxman

assuming the same effective compression is achieved
(i.e. a 10 psi boost on an 11:1 comp ratio versus a 15 psi boost on a 9:1 comp ratio) then yes, the final power may be the same, but the higher comp set up is still going to have the benefit of better off boost power, quicker spool, and better throttle response

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I hope you mean quicker spool as in boost vs time, not boost vs rpm, since a higher compression ratio does not yield any more exhaust gases.

faster off boost reponse=quicker acceleration=less lag/quicker spool time wise


you're correct that vs rpm, it's not going to make a difference, you'll just get to said rpm sooner so percieved lag is reduced

not just what ever compression...u need to choose the right cams, right piston, right tb, right intake, right turbo, right rods...there is just too many things to consider if you want to have hi-boost + high HP....

but if you want to go for a simple setup, just get a turbo kit by Apexi...if hardcore, kkk-series...

i'd rather have response. So standard compression/turbo and good tuning.

Farknell, everybody is going in circles.

If you want lag and that "ill just keep it at 3500rpm, and smoke this foo", then lower your compression for better peak power, sacrificing low down torque. As Saxman pointed, you can easily run higher boost, but you will lose low down driveability, oh, and torque-steer is not your friend.

If you want quicker off line acceleration, better throttle response, at the 'higher' risk of detonation from poor tuning, without needing to run high psi. Then leave compression high. In turn, its reccomend upgrading valvetrain to something that can handle higher comp with boost. ECU & Fuel supply are A MUST - do not go el-cheapo here mofo's, you will get slapped. Most importantly, a good tune from somebody that knows what they are doing. Do it once, do it right.

You will also need love and support from your garage, a big bucket of maltesers, and a few kegs of your favorite beer at arms reach. DO NOT SACRIFICE ON THE BEER!!!! YOU WILL BE SLAPPED!