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JohnJL's Avatar
Join Date: Jan 2005
Location: Toronto, Ontario
Posts: 4,729
Supercharged Exhaust Theory and Practice

I don't have any I'm just interested

Another thread was inconclusive, popular opinions included the absolute necessity of x-over vs the view of going straight out of the shortest headers possible.

Authoritative, opinionated and theoritical posts invited.

2007 911 Turbo - Not a toy
1985 911 Cab - Wife's toy
1982 911 3.2 Indiash Rot Track Supercharged track toy
1978 911 3.0 Lichtbau toy "Gretchen"
1971 911 Targa S backroad toy
Old 03-06-2009, 09:19 PM
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930gt-40r's Avatar
Join Date: Jan 2007
Location: Boca Raton, FL
Posts: 2,063
Well if nasty cams are involved, then: I would make a nice set of long tube, equal length, burns-merge-collected headers. Then go into separate bullet mufflers going accross the back of the car and then out.
Now on a race car, you take the merge collectors, extend the secondary side of the collectors, and do the old crayon trick- thus cutting off where the pulses stop hitting the sdes of the pipe.
Kris @ Tech9
86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 03-07-2009, 08:14 AM
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
I suspect, turbo set up is different but super charging mostly follows normally aspirated exhaust theory. As eludes to, there is potential resonance tunning possible that can create a scavenging effect and gain a higher VE where wanted.

Cam over lap, tubing size, length, collect design all have effect in determining at what rpm and how much this will help.

Double check this if you get to actually doing a build.

Old 03-08-2009, 07:58 AM
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