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Originally Posted by RX200013B
for ITB's, would 4 38mm throttle be big enough?
for a SP or even a half-bridge?
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I don't know what manifold you would be using, but I think that 38mm would be a little small for the secondaries (plenty for the primaries).
I saw a couple builds and they both were using 3 48mm TBs, one for the two primary ports and one for each secondary port.
3 44s would probably be sufficient.
This flows about the same as 4 38s, but the flow into the secondary ports is a lot higher than the flow into the primaries and needs the throttle sizing to be correct.
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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