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911nut 911nut is offline
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Join Date: May 2001
Location: Michigan
Posts: 2,511
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.
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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