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mark houghton mark houghton is offline
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Join Date: Jul 2008
Location: Central Washington State
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Originally Posted by gsxrken View Post
That's counter-intuitive to me. Pressure always goes from high to low, and there has to be more pressure in the exhaust tubing than atmosphere, particularly on a turbo car. I could see a leak lowering the volume of exhaust, but not the ratio.

An intake leak, on the other hand, would alter AFRs.
Agreed, it does sound counter-intuitive. Mabye it's like a venturi affect with the volume and velocity of the exhaust gasses moving across a small hole, thus drawing air in.
I haven't had this experience myself, just quoting what I have heard other people comment on. I could be way off base and would be happy to stand corrected.
(oops, sorry for the hijack).
Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 03-09-2010, 11:24 AM
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