IB - i read your writup on the turbo. i must say, it is a very well writen and infomative artice. much props. the one problem i see is related to this thread.
you say:
Throttle Body/intake manifold. You’re going to want to go with a large plenum intake manifold such as the Edlebrock, JG, or other intake manifold. That will make considerably more power under boost than your puny, stock intake manifold that was probably designed mostly for throttle response. Your turbo piping on a sophisticated turbo setup is probably 2.5 inch pipe most likely. All the street legal kits I have seen are smaller at like 2.25 inch pipe. People, huge throttle bodies do NOTHING on turbo motors. 2.5 inch pipe is 63.5 MM in diameter. But still, that doesn’t even matter because as long as your intake manifold is pressurized, the engine doesn’t know the difference. Your boost gauge is hooked up to your intake manifold right? Does it read a steady 10 PSI? Then that means your intake manifold is a steady 10 PSI, so why is a 70 MM throttle body going to do a damn thing? Get the picture?
in that paragraph, you say that the TB doesn't matter because as long as the manifold is reading 10psi... then upgrading to a 70mm will not do anything. i agree that TBs are not a good hp/dollar investment for boosted motors.
but, you also state that the new intake manifold is a good improvement. and i agree, it is a good hp/dollar improvement. but by your logic, it shouldn't be... because the manifold pressure is 10psi with either manifold right?
you see the contradiction? i agree with both statements, TBs are not worth it, and intake manifold yeild good results... but your reasoning is flawed.
now do you see my point that PSI is just a relative term, the new manifold actually flows more air, thats why it is a good improvement. where as the new TB does not flow much more air, thats why it is not really worth it.
besides that, its a nice writeup!