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930gt-40r 930gt-40r is offline
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Join Date: Jan 2007
Location: Boca Raton, FL
Posts: 2,063
Originally Posted by drmatera View Post
I'm curious, how did you determine the 1.625 primaries were choking the motor? What were the signs?
Because when I went to the 1 3/4" primaries/ 2 1/4" secondaries and I gained spool and top end just by bolting them on with my old turbo. The header design was roughly the same as my old headers, just bigger tubes and diffrent wastegate placement. Now with my 4094R- it has a divided hot housing (1.06 a/r) and it spools even faster than my PT-67 (.81) which is considerably smaller. I get 15 Psi out of the 40R+ new headers at 3400 rpm where before I couldnt see even 7 psi on the old setup at that rpm. The whole reason I went to big primaries/secondaries was because I wanted to push out 700 horse on race gas. On pump gas- Ive seen simaler setups make about 550 on reasonable boost
Kris @ Tech9
86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 08-10-2010, 07:14 PM
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