Quote:
Originally Posted by WERK I
911tt33,
That turbo has too small a turbine. You're adding GT2 Evo cams in a turbo'd engine that will choke you with back pressure on the top end(not good). If you insist on the GTX30776R turbo, go with shorter duration cams.
I also think you may be undersizing your headers with the FabSpeed units. Anyone can chime in here, but with the size of those primaries, they may be too small for the 3.2 exhaust ports? I love the 3.2 engines. Those heads flow really well. Just think there may be issues with port mismatch to primaries.
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Yeah, that's turning into a hodge podge of mis-matched parts.
Fabspeed headers are too small. They're fine for a really mild CIS engine with small cams; not right for a deep breathing engine with Carrera heads and GT2 cams.
Your choice of cams, heads, displacement and compression should be determining the header's size and turbine size. Those GT2 cams have decent lift and duration, with a narrow lobe angle (some overlap). They hate backpressure. If you want them to work and take advantage of the Carrera heads' 41mm exhaust ports, don't think so small. In this case, bigger is better.