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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Here is one of the better turbo exhaust articles from a I have seen that is from a turbosystems engineer at Garret.

Turbo Exhaust Theory

It dose say:

getting the boost up early is a much more effective way to torque than playing with tuned primary lengths and scavenging
I belive this is in support of reducing exhaust volume.

Latter he notes:

As for primary lengths on turbo headers, it is advantageous to use equal-length primaries to time the arrival of the pulses at the turbine equally and to keep cylinder reversion balanced across all cylinders. This will improve boost response and the engine's VE. Equal-length is often difficult to achieve due to tight packaging, fabrication difficulty, and the desire to have runners of the shortest possible length.
This supports that equal length can help 'boost response'.

Unfortunately he is not very direct in discussing the trade offs between lowest volume and a balanced system.

There is a bunch of other neat stuff in the article to.
Old 01-14-2010, 04:42 PM
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