Quote:
Originally Posted by EdKiefer
If you try an add very short runners with each cylinder having TB, this tends to opimize high rpm usage . If for example to modified a vehicle that has single TB with one plenum and long runners you will lose a lot of low end torque and throttle will be extremely sensitive . only way around will be extremely small TB.
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Yah, I'd be looking at a 20 mm throttle bore if I were to be doing this to my truck. To my knowledge, that's in the realm of lawn mowers and similar small engines.
The big problem with this arises from trying to adapt it to the existing engine electronics. There is no more reliable vacuum source from which to do speed-density tuning (MAP and IAT). MAF engines should not have this problem, though.
A secondary problem arises from implementing engine idle. That's pretty much independent of whether the engine uses MAF or speed-density.
A tertiary problem arises from powering vacuum-dependent accessories, like power brakes and cruise control.