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Originally Posted by davesdeville You aren't going to need a bigger throttle body since the air is compressed it will fit through a 4.5 TB just fine. No way you'd need a 454 TB. |
Uhm, do me a favor, pick up a drinking straw and blow through it, pretend that you are making 5psi of pressure from your mouth through the straw. (your mouth is the turbo) Ok now pinch the straw a bit, you are still making 5psi out of your mouth but the amount of air getting out is not the same amount.
You want Zero restrictions between the compressor housing and the combustion chamber. Having too small of a throttle body is like putting a restricter plate. The turbo may be making 10psi of boost in the area between the compressor and the throttle plate, but if it can't flow that much air even compressed through the TB then it wont be getting full boost to the intake manifold.
Hence why even turbo imports install larger throttle bodies and larger down pipes.
More air you can get in and out the more power you make.
And if you can do it with less restrictions you can make more power with the same amount of initial boost.
I don't mean to sound harsh, but I have really been thinking about tossing a turbo at my 4.9 Fiero. So I have been doing research on the subject. Just to help with the higher end department. Right now it drops out around 130-140mph I would like it to be able to pull strong to 150-160mph. (without using nitrous)
P.S. if you want a bit of a laugh, take a read at
Capt's Beginner Turbo Site
I wrote this for the absolute novice person looking to do a Turbo 2.8 V6 Fiero. The language used is plain English and simple terms instead of technical specs. So it is not meant as a bible just a basic get to know your turbos.