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1G Wastegate size help

Posted by BoostedS256, Oct 13, 2018

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  1. BoostedS256

    BoostedS256 Proven Member

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    I’m a newb when it comes to choosing the correct size so help would be aprreciated. My setup is a s256ett, wastegate off the o2 housing with 3in exhaust, car runs 28 low and 32 high via ebc. Currently has a Chinese Godspeed wastegate(no clue what size)that I wanna toss before it fails!

    So what mm do you guys recommend and what spring do I need for the psi I’m running? Thanks!
     

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    My DSM:
    1991 Mitsubishi Eclipse GSX

    Street Build

    GT35   manual
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  2. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Tial 38 or 44 with the appropriate springs for your desired WG setting. Most gates have a chart with them. They can be tough to take apart and put back together so get a buddy if you can for extra hands.
     
    My DSM:
    1992 Eagle Talon TSi AWD

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  3. BoostedS256

    BoostedS256 Proven Member

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    Olympia, Washington
    38 or 44 huh? Why not a 40? Since my low setting is 28psi that means I would put 14.5psi springs into the wastegate correct? Or do I set it to my higher setting and do 16psi springs? Thanks
     
    My DSM:
    1991 Mitsubishi Eclipse GSX

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  4. tametalon92

    tametalon92 Proven Member

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    Generally cost vs effect. I haven't checked recently, but I assume the extra cost for limited improvement of a 40mm would be better spent to go towards a 44mm.

    For wastegates, you really can't go too big as long as you can afford it.

    Most of your limitation seems like it would come from the wastegate location and the orifices that lead to it being too small. Make sure to port them as much as you can.
     
    My DSM:
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  5. Vegas smith

    Vegas smith Proven Member

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    The only reason (most likely) that you have 40mm and 38mm is proprietary differences between the companies. I imagine TIAL has a copyright on the 38mm. You'll be fine running anything you buy, but why not get the 44 if you can fit it.
     
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  6. donniekak

    donniekak DSM Wiseman

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    Don’t waste money on a big gate with your setup. A 38 and 60 would both flow the same on your setup.

    The gate can only flow as much as the wastegate hole in the turbine housing.
     
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  7. tametalon92

    tametalon92 Proven Member

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    I agree with @donniekak.

    Normally I'd say get the bigger gate if budget suits, but unless you have a bigger turbo and/or manifold to suit, it won't do you any good in an O2 mounted location.
     
    My DSM:
    1992 Eagle Talon TSi AWD

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  8. BoostedS256

    BoostedS256 Proven Member

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    Olympia, Washington
    that makes sense thank you guys 38mm it is!
     
    My DSM:
    1991 Mitsubishi Eclipse GSX

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  9. brian9397gsx

    brian9397gsx Proven Member

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    Also the spring you use also depends on how you are controlling boost. If its electronic and you are using both ports on the waste gate you can just put in the lightest spring. If your just using a manual boost controller your generally limited to a max 2x your spring pressure. So I'd do the 16lb spring in that case.
     
    My DSM:
    brian9397gsx 1993 Mitsubishi Eclipse GSX

    19.80 @ 35.55 MPH
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  10. BoostedS256

    BoostedS256 Proven Member

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    Olympia, Washington
    It’s a 2 setting electronic turbosmart but it only runs off one of the bottom ports on the gate so figured I’d still just do the 16lb spring?
     
    My DSM:
    1991 Mitsubishi Eclipse GSX

    Street Build

    GT35   manual
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  11. brian9397gsx

    brian9397gsx Proven Member

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    Yep you would treat it like a manual boost controller since your only controlling one port. Since you're electronic I'd put your bottom port directly to boost and run the controller on the top. Youd be able to control boost a lot better. At least that's how I've always done it then you can toss the lightest spring in and add boost to the top to hold it shut and control it with the ebc cutt cycle.
     
    My DSM:
    brian9397gsx 1993 Mitsubishi Eclipse GSX

    19.80 @ 35.55 MPH
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  12. BoostedS256

    BoostedS256 Proven Member

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    Joined Oct 11, 2018
    Olympia, Washington
    To be honest you lost me a little there LOL, lightest spring as in 14 for my 28psi setting? Where should I pull boost from for the top port?What’s a cutt cycle?
    How come it seems to hold boost fine right now even tho I’m only connected to one port on the gate?
     
    My DSM:
    1991 Mitsubishi Eclipse GSX

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  13. brian9397gsx

    brian9397gsx Proven Member

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    sioux city, Iowa
    Lol yeah it will dont matter the way you've got it works fine. I've used 8 lb. Springs in the past and with controlling the top port I could get it to hold up to 25
     
    My DSM:
    brian9397gsx 1993 Mitsubishi Eclipse GSX

    19.80 @ 35.55 MPH
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