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Forced Induction Benefit in keeping stock exhaust piping

Discussion in 'Powertrain' started by kudkud, Aug 30, 2006.

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    kudkud Member

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    Benefit in keeping stock exhaust piping

    Are there any benefits in keeping the stock exhaust piping of 1 7/8" if I am going turbo? (except cost). Will it be a bottleneck for the system?
    kudkud, Aug 30, 2006
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    teevee247 Well-Known Member

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    It will be a bottleneck, best bet if you are going with Forced Induction is 2.5" if its low PSI (like 5 or so), or 3" if you are going to be running like in the 7~11 PSI range...
    teevee247, Aug 30, 2006
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    vortex Well-Known Member

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    2.5" has been fine through 14 for me.
    vortex, Aug 31, 2006
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    JspeXAE102 Well-Known Member

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    it's a great way to let the backpressure to hold your wastegate shut for boost spikes.
    JspeXAE102, Aug 31, 2006
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    kudkud Member

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    2.5" then. Thanks

    How far away from the turbine should I "re-introduce" the WG discharge into the exhaust flow?
    kudkud, Aug 31, 2006
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    monkey4005 New Member

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    on a VW like mine when i chip it ill be spiking at 20 and holding 15. on a stock exhaust..... alot of people do it.
    monkey4005, Aug 31, 2006
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    kudkud Member

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    OK, let me get this clear.

    1. Don't re-introduce the WG discharge into the exhaust flow. Just dump it into the atmosphere thru a dump tube. Won't this be pretty loud?

    2. Go all the way 3" instead of 2.5". I only have a T3 and the turbine outlet is 2.5".
    kudkud, Aug 31, 2006
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    kudkud Member

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    OK, I get it now. Thanks!!!:)
    kudkud, Aug 31, 2006
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