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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,556
How much overboost you get with a B&B depends upon the turbo used, among other things.
If you're not pushing much air you won't get much overboost. There are folks here on this forum who have blown engines by overboosting when using the combination of B&B and a big turbo.
The dual waste gate design follows suit by becoming more important with higher flow turbos. It is a more precise way to meter the boost signal and relieve the pressure. I plan to dyno both the 993 and SSI systems using dual waste gates. Those graphs will be compared to my baseline engine using the stock J-pipe style exhaust. No other changes will be made; very exited to see the results. I have ordered one set of dual 38mm TiAL units to use on both systems. Should be a very fair test.
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 01-21-2009, 01:37 PM
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