4AGE ITB's Rolling Road session

[parrot]

robokill Wrote:without any head work (porting or other cams) I don't see the gain in using itb.

I agree. Though like everyone else on here, this car will no doubt be a work in progress.

My point with injectors still stands. What does a 'Standard' injector refer to in this case? 182cc, 200cc, 210cc or 213cc? Perhaps a smallport 250cc? There is a lot of potential variation there.

Presumably these runs were done on a chassis dyno. Toyota got close to 200ps on an engine dyno using 250cc injectors on a group A 16 valve. Meanwhile a standard 20 valve uses 295cc injectors. In this situation the air displacement is greatly increased with the 4 throttles compared to a single throttle plenum. Presumably fuel demand also increases in a linear fashion.

Allowing for transmission losses, I doubt a 182cc injector would cut it in this situation. If you utilise the approximation of HP = cc per minute /5, a 182cc injector will only produce in the vicinity of 145hp at the flywheel.

What colour are the injectors?

But once again,

robokill Wrote:without any head work (porting or other cams) I don't see the gain in using itb.