Is a 60mm exhaust diameter enough?

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gamblinfool

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Discussion starter · #1 · Jun 27, 2008

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I'm going to be building a 2L 8v turbo (83.5mm in a 3A w/ x-flo head) and I currently have a Supersprint 60mm Gruppe A cat-back exhaust. Target is 250hp or so. Most turbo folks run 2.5" minimum and the 60mm SS is only 2.36"-ish. Wondering if I should move the SS system to the GTi I'm about to buy and buy a Jetex 2.5 later.
Any opinions? Thx, JT

 

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sp_golf

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#2 · Jun 27, 2008

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Re: Is a 60mm exhaust diameter enough? (gamblinfool)

you should be fine with the 60mm exhaust. It will make less power than a 2.5" at the same boost levels, but for 250hp it won't be a big restriction compared to a 2.5". If you're gonna buy a new exhaust for your new GTI anyway, just switch them when you get the new exhaust

 

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rodhotter

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#3 · Jun 29, 2008

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Re: Is a 60mm exhaust diameter enough? (sp_golf)

add a bigger downpipe for quicker spools, i have a 3in GHL to 2.5 TT on back i can tell when i run the 2.5 in for street use, i have an apr ko-4 boost to 25 lb in 3rd real quick

 

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Salrocco

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#4 · Jun 29, 2008

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This topic relates to something i was wondering about.. If you ran to small of exaust like stock exaust about 1.5in with a 2.5 downpipe what problems would you see?

 

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TBT-Syncro

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#5 · Jun 29, 2008

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Re: (Salrocco)

Quote, originally posted by Salrocco »

This topic relates to something i was wondering about.. If you ran to small of exaust like stock exaust about 1.5in with a 2.5 downpipe what problems would you see?

low power and high EGTs