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copbait73 copbait73 is offline
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Join Date: Nov 2003
Location: Chesterfield IN
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Originally Posted by RarlyL8 View Post
The SSI system is not restrictive. That piece of bad information has been spread by dealers of cheap short tube T304 headers. I took a trip out to CA to meet with John/SSI about this system before developing the Y-assembly with M&K and selling them complete. He had pictures and dyno data of a similar twin turbo setup making 600HP. We went through the physics and how the equal length primaries helped off-boost torque as well as top end flow/HP. I used those same principals and applied them to include the secondaries when designing my own headers.
Thank you Brian. Yes, Porsche had unequal length headers in their learning years however they were abandoned long ago.

Go to any historical turbo engine. Investigate F1 in the early to mid-80s you will see equal length primaries of significant length, seriously designed collector feeding larger than primary secondaries.
Old 12-11-2009, 07:30 AM
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