Forced Induction Superchargers | Turbochargers | Intercoolers

sts turbo tailpipe problem

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Old Feb 1, 2008 | 04:24 AM
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Default sts turbo tailpipe problem

after 3 months without a muffler or a tailpipe on my STS kit, i put one there today and i hate it because the truck wont make full boost and would only make it at higher RPMs. i didnt put a muffler, it is a 3 inch tailpipe that goes on the right corner. what are you guys with turbos using as a tailpipe or what would you recommend?
mods are:4.8 5 speed, Sts Turbo @7psi, Pacesetter Lts, 220/220 cam
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Old Feb 1, 2008 | 07:32 AM
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That's weird. I have a Borla XR-1 after the turbo, and the car makes full boost by 3600-ish rpms (and that's a T76). Granted I'm only boosting 5 psi right now. I didn't see much of a difference in spool time at all when I put it on. I'm sure this doesn't help much, but just wanted to let you know my experience.
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Old Feb 1, 2008 | 07:51 AM
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Why do you have headers with the STS?
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Old Feb 1, 2008 | 11:50 AM
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Put the stock manifolds back on and wrap the hotside all the way back to the turbo then use a bigger diameter tailpipe. That should drop the spool time down.
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Old Feb 1, 2008 | 12:00 PM
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i had the headers on before the sts setup. ill try my best
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Old Feb 1, 2008 | 12:04 PM
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Loose the headers and wrap the stock exhaust all the way from the manifolds to the turbo.
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Old Feb 1, 2008 | 12:15 PM
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The headers aren't helping, but if it was making boost before the tailpipe, and all that was changed was adding the tailpipe....something's got to be up.
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Old Feb 1, 2008 | 01:07 PM
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the million dollar question, take the tailpipe back off, does it go back to normal?

it might be something else completely but a freak coinkydink that when you put the tailpipe on it cropped up.
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Old Feb 1, 2008 | 01:18 PM
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thanx for the help
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Old Feb 1, 2008 | 02:43 PM
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Originally Posted by Blackbird
the million dollar question, take the tailpipe back off, does it go back to normal?

it might be something else completely but a freak coinkydink that when you put the tailpipe on it cropped up.
+1..
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Old Feb 1, 2008 | 07:49 PM
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It may all be in your head too. I did the same thing, with the car quieter it just doesn't sound as fast. I also felt like I had a lot more low end torque with the muffler after the turbo than without.
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Old Feb 1, 2008 | 08:36 PM
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i have the stock exhaust pipe and i build boost fine. wrap your exhaust from your y-pipe all the way back to the turbo.. yoiu will cut down spool time (spool quicker)

this is before i wrapped it
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Old Feb 1, 2008 | 10:54 PM
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Originally Posted by sowaidi
after 3 months without a muffler or a tailpipe on my STS kit, i put one there today and i hate it because the truck wont make full boost and would only make it at higher RPMs. i didnt put a muffler, it is a 3 inch tailpipe that goes on the right corner. what are you guys with turbos using as a tailpipe or what would you recommend?
mods are:4.8 5 speed, Sts Turbo @7psi, Pacesetter Lts, 220/220 cam
Try iy w/out the tailpipe and see if it makes full boost again. If yes, use a BIGGER tailpipe, like a 3.5" diameter. There was a previous thread concerning tailpipe diameter, which should be 1.5x the turbo outlet diameter.

Good luck
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Old Feb 2, 2008 | 12:32 AM
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thanx for the help guys
ill get a bigger pipe, maybe a 4 inch or the biggest i could get, and wrap the whole thing from headers and on
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