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PT88---3.5" downpipe okay?

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Old 10-19-2009, 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 10-19-2009, 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 10-19-2009, 07:41 PM
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you sure?
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Old 10-19-2009, 07:45 PM
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Originally Posted by Snyper
you sure?
It's a 4
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Old 10-19-2009, 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 10-19-2009, 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 10-19-2009, 08:00 PM
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I can take it about 2" haha
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Old 10-19-2009, 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 10-19-2009, 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 10-19-2009, 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 10-19-2009, 08:31 PM
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http://www.precisionturbo.net/Wcf46374e366e6.htm
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Old 10-19-2009, 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 10-19-2009, 08:33 PM
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4 bolt
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Old 10-19-2009, 08:54 PM
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oh mines Vband...so 4"
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Old 10-19-2009, 08:58 PM
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mine is 3.5"....3960# @ 147mph....
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Old 10-19-2009, 08:59 PM
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....thats what I was looking for.
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Old 10-19-2009, 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; 10-19-2009 at 09:22 PM.
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Old 10-19-2009, 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 10-19-2009, 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 10-19-2009, 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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