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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
 
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,563
Garage
My muffler and waste gate dump are good for 12whp on a stock 300HP Euro 930 engine. The baseline engine I tested used the stock early Euro muffler. I also tested late USA 930s with CAT and found similar results. It is interesting to note that 0.75bar was maintained in both situations. I assumed boost may increase a little due to lack of back pressure on the waste gate but that did not occur on these stock cars. Any extra boost would of course scew the power number.
That is only a tiny part of the story. The engine revs quicker, more freely, and boost comes a few hundred rpm sooner. You also get all those great turbo sounds that the stock system hides. The driving experience is transformed.
A straight through non-restrictive and non-baffled muffler is a must-do before looking at performance enhancements. The turbo must not have back pressure.
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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 01-04-2010, 10:45 AM
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