Re: Divided downpipe - Saab Performance Bulletin Board - Saabnet.com
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Re: Divided downpipe
Posted by Rick Thompson [Email] (more from Rick Thompson) on Wed, 31 Aug 2005 18:53:58
In Reply to: Divided downpipe, mg, Wed, 31 Aug 2005 18:18:44
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If you're looking for a pipe exhaust from the turbo outlet, on the Mitsu turbo, you need a pipe that has a common collector, and no obstruction for the wastegate swing arm. The 2 pipe manifold, by design, will not give the swing arm room to open without hitting the flange plate, and will not blow off enough when needed, 'cause it'll hit the flange and jamb at that point. I just had Jak make me one, and voila, no wastegate concerns at all, and it'll flow faster and better through a BIG oval than through 2 pipes, with an obstruction in the middle. A twofer will work with the old Garret design, which had the wastegate inside the turbo, the hole was on the turbo body, and it'd dump straight into the small pipe, with the turbo outlet dumping into the big pipe, separated flow, and can act as a scavange. But only with that turbo, not the Mitsu, it'll retrict flow on that one. Take the housing off the Mitsu turbo (5 bolt), and you'll immediately see what I'm talking about.
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