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Forced Induction Superchargers | Turbochargers | Intercoolers

PT88---3.5" downpipe okay?

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Old Oct 19, 2009 | 01:54 PM
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Default PT88---3.5" downpipe okay?
Will a 3.5" downpipe support 850whp without causing back pressure issues on a pt88? Im sort of space limited and that extra .5" would make fitting the downpipe alongside the engine MUCH easier. When does a 3.5" downpipe become restrictive?
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Old Oct 19, 2009 | 07:35 PM
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the outlet on the PT 88 is a 3.5 so I would say yes.
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Old Oct 19, 2009 | 07:41 PM
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you sure?
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Old Oct 19, 2009 | 07:45 PM
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Originally Posted by Snyper
you sure?
It's a 4
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Old Oct 19, 2009 | 07:47 PM
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..yeah thats what I thought..so back to my original question...will a 3.5" restrict this turbo to where it wont make 850whp without causing alot of b.pressure?
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Old Oct 19, 2009 | 07:52 PM
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I would take it as far as possible with the 4" and then reduce at the point that you need it in order to fit. Should be able to hit 850 rwhp if everything else is right.
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Old Oct 19, 2009 | 08:00 PM
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I can take it about 2" haha
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Old Oct 19, 2009 | 08:02 PM
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Originally Posted by Snyper
I can take it about 2" haha
Any step is a good step.
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Old Oct 19, 2009 | 08:29 PM
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It is 3.5 inch I had to neck mine up to a 4 inch.
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Old Oct 19, 2009 | 08:31 PM
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Originally Posted by 02SSLE
It is 3.5 inch I had to neck mine up to a 4 inch.
Mine is 4 inch.

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Old Oct 19, 2009 | 08:31 PM
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http://www.precisionturbo.net/Wcf46374e366e6.htm
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Old Oct 19, 2009 | 08:33 PM
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4 inch will work but you have a v band clamp kit on it so that is why. Mine did not have a vband and was 3.5 inch.
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Old Oct 19, 2009 | 08:33 PM
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4 bolt
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Old Oct 19, 2009 | 08:54 PM
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oh mines Vband...so 4"
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Old Oct 19, 2009 | 08:58 PM
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mine is 3.5"....3960# @ 147mph....
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Old Oct 19, 2009 | 08:59 PM
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....thats what I was looking for.
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Old Oct 19, 2009 | 09:00 PM
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I was going to run a gt4292 which has a 4" vband also, but there is absolutely no room for the downpipe on these kits and I didn't want to neck it down either.

Edit: pt88 uses a 4" vband
Last edited by 98Camarod; Oct 19, 2009 at 09:22 PM.
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Old Oct 19, 2009 | 09:15 PM
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pt88 is a 4" vband flange. ive never seen a 4 bolt PT88
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Old Oct 19, 2009 | 09:23 PM
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Originally Posted by TheFallen
pt88 is a 4" vband flange. ive never seen a 4 bolt PT88
mine was 4 bolt flange look at the link above. PT88 is a T4 flange not offered in a T6 unless something new.
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Old Oct 19, 2009 | 09:27 PM
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Originally Posted by 02SSLE
mine was 4 bolt flange look at the link above. PT88 is a T4 flange not offered in a T6 unless something new.
like above says nothing about a 4 bolt exhaust housing nore does it say anything about 3.5 downpipe. I have a PT88 and its 4" Vband exhaust, 3" outlet, T4 flange and 4" inlet
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