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Porting exhaust housing for an EvoIII 16g

Posted by EVLGSX, Dec 25, 2017

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  1. EVLGSX

    EVLGSX Proven Member

    398
    151
    Joined Dec 7, 2017
    Wallingford, Connecticut
    I know there are other threads on this but I wanted to show the results of my port job on the wastegate and report back with how it turns out after I put it back together and take the car out.

    I started off with a carbide rotary file on a pneumatic rotary tool, then a small drum sander, 80, 180, 320 in that order, then did 180 followed by 320 by hand.

    Hopefully the boost creep is under control now.

    For anyone who doesnt know, the idea is to remove material to give the air a more direct unobstructed path to flow through. As it comes, the air has to flow around a sharp corner which is part of the problem. By removing the material that is in the way, and smoothing things out, it speeds things up and helps move the air through the passage we want it to go through.

    ( I have more photos to add of the work from the other side to open the flapper as well and will add them tommorrow)

    hope this helps someone

    Heres a look at the exit side of the housing. I dont have any photos of before I removed all the material I did, but the idea is illustrated in the photo where I am holding the flapper partially open, rather than a full 90 degrees open. Normally the flapper arm would hit against the actual housing before opening a full 90 degrees.
     

    Attached Files:

    Last edited by a moderator: Dec 30, 2017

    Street Build 2K  15

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Loading...
  2. EVLGSX

    EVLGSX Proven Member

    398
    151
    Joined Dec 7, 2017
    Wallingford, Connecticut
    Heres a look at a 16g that has had nothing done to it. Ive got my car back together now and the difference is tremendous. This is 100% without question worth doing and should solve most peoples creep issues on this fun daily driver turbo. I havent gone over 18psi with it yet, but will be in the coming weeks as i dial in link. As of now, there is zero creep as if its on an external gate to the manifold.

    In the past, I had dealt with this sort of issue by welding a 38mm tial flange to my manifold and dumping atmosphere, I was always too lazy to route it back into the downpipe even though I was tired of the noise so this is great.
     

    Attached Files:

    Street Build 2K  15

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Loading...

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