I have an AMC/Renault Alliance Multipoint EFI Manifold and while looking at the standard throttle body made me think what size would be optimal? The std throttle body has 2 x 32mm dia throttle butterflies that open sequentially, the 2nd starting to open when the 1st is half open and then both are fully open at the same time. The 2nd throttle butterfly is also choked down to 21mm.
Therefore the effective throttle area at WOT is 32 + 21 dia giving an area of 1150mm2
A single throttle body with a dia of 50mm would give an effective area of 1963mm2 but, is this overkill and would it be poo at low engine speeds when it comes to mapping?
This is all for a C1J with the capability to make 200 ponies approx. What size should I be looking for considering the std carb is choked to 25mm dia?