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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 14,083
Bench testing a wastegate using only compressed air to the inlet port will not yeild true results as there is no exhaust pressure on the valve.
Back pressure from the stock muffler is taken into account with the OEM wastegate spring and will not yield exact results when the exhaust system is altered. The spring used must accommodate the new (different) pressures created by the new exhaust system to remain identical in cracking pressure and full boost pressure.
There is no such thing as a "1.0bar" spring for every application. Close, yes, but not exact.
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 06-05-2013, 03:57 AM
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