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911nut 911nut is offline
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Join Date: May 2001
Location: Michigan
Posts: 2,511
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It's a dilemma.
Less resistance to flow means more gas velocity at the turbine inducer and faster spool-up.
Equal length headers yield better off-boost performance but IMO it's hardly worth the effort since a turbo engine spends so little time off-boost.
My 993 heat exchanger based system is the shortest possible primary path possible. Boost threshold is around 2500 rpm so time spent off boost is negligible.
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Paul B.
'91 964 Turbo
Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, - 210 lb
Old 01-08-2010, 04:59 PM
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