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turbo back pressure ??'s

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Old 11-04-2009, 04:02 PM
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Originally Posted by 4.8T
that part is easy, stock 5.3l with p&p ls6 heads and patriot springs. stock gaskets and arp studs, 2003 ls6 cam. its got trick hot pipes and a tc78 with the f1 68mm exhaust wheel inside a .96 A/R housing. it has a 3" downpipe to a 4"diesel exhuast with huge magnaflow muffler.



you had some pretty good back pressure there. what turbo and exhaust side (wheel size and A/R) did you have on there? hope its less for my 5.3l.
had to be a t76 with .96ar on the exhaust side. this was on a 408.
Old 11-05-2009, 08:05 AM
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I have put a boost gauge on mine and that's what told me Im running way to much exhaust pressure and need to change turbos you don't want to run it on the dp, instead run it right before the turbo on the hot side... It would be ideal to run about the same amout of boost in exhaust pressure as intake pressure
Old 11-05-2009, 08:23 AM
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i'm going to do BOTH. how do you know if its the hot pipes or the exhaust if you don't check both.
Old 11-05-2009, 11:49 AM
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If you can check before and after. Before check BP prior to turbo and the other checks BP for the rest of the exhaust.
Old 11-05-2009, 12:02 PM
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hey rick, you think two 3" down pipes would fit in there? like have a y right off the turbo into 3" downpipes?
Old 11-05-2009, 02:28 PM
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I doubt it. lol
1 4" is a hard maybe,
3.5 should be no problem. Then jump to dual 3".
Old 11-05-2009, 06:08 PM
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well that sucks. i would like to do at least a 3.5"dp.
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