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1G Looking for a different exhaust manifold...

Posted by RipperXX, Dec 18, 2018

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  1. Crackerman

    Crackerman Proven Member

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    If I remember correctly, you don't lose any power if the exhaust is sized appropriately (3" or larger) and the wastegate gate re-enters the exhaust more than 18" past the turbine housing.
     
  2. donniekak

    donniekak DSM Wiseman

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    Going from a full catless 3” exhaust to a hood exit usually makes nice gains even on 500whp cars.
     

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    1991 Eagle Talon TSi AWD
    manual · 1G DSM
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  3. Crackerman

    Crackerman Proven Member

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    Apples

    Oranges
     
  4. donniekak

    donniekak DSM Wiseman

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    How so? It proves that even a straight 3”
    Full exhaust is a restriction. Why try to shove any more exhaust than necessary through it?
     

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  5. Crackerman

    Crackerman Proven Member

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    I do agree that shortest exhaust is best for power. Anything approaching 450hp, could benefit from a larger than 3" exhaust. My post was in reference to the earlier 2 posts, discussing full exhaust setups and recirculating wastegate back into the exhaust.


    So a full race type hood stack vs a full exhaust "street legal" is an apples to oranges comparison.
     
  6. donniekak

    donniekak DSM Wiseman

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    No, it’s proof that even a 3” is a restriction that will show gains from lowering the exhaust volume flow with an external dump.
     

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    1991 Eagle Talon TSi AWD
    manual · 1G DSM
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  7. donniekak

    donniekak DSM Wiseman

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    I build a lot of cars. I either stick to the simplicity of an internal gate setup, as long as it won’t prevent goals being met, or go to a non stock footprint turbo and dumped wastegate.

    I don’t really understand the aversion to an external setup. You only hear it when you don’t really care if the car is loud, wot.
     

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    1991 Eagle Talon TSi AWD
    manual · 1G DSM
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    tametalon92 likes this.
  8. jakk220

    jakk220 Proven Member

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    Personally, I hate having an open 02 dump and I currently have mine recirculated with the wastegate off the 02 housing. Even at WOT to me its annoying. I like being able to hear the engine for any potential issues and I enjoy hearing the turbo spool and what not. I also don't have a race car. I plan on trying to fab something this year so I can have the wastegate off of the manifold and still recirculate it. I may set it up to where I can have it either recirculated or open dump by just switching out the pipe.
     

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    awd · manual · 1G DSM

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    1993 Mitsubishi Eclipse GSX
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  9. RipperXX

    RipperXX Proven Member

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    I'm aware.
     
    Last edited: Jan 10, 2019

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    1990 Eagle Talon TSi AWD
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