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Thread: wastegate placement explained

  1. #21
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    Ya he can hold 3 psi to redline on a huge turbo.

  2. #22
    Premium Member boosted_teg's Avatar
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    amazing boost control. im jealous
    2001 Boosted Built k20a2 Billet BB 6766BB

    2013=579whp 406trq @ 24 psi c16
    10.87@137mph

    2014= 510whp 370trq @ 18psi pump gas


    2015= 7xx @ 30psi??

  3. #23
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    It doesn't hold exactly 3psi as the turbo is large and doesn't want to make 3 psi (most turbos have a minimum amount of boost they like to make even if you have ideal WG placement, but if WG placement is poor you push that threshold very high up -- I've seen K20 turbo kits that want to make 9psi on a 3psi WG spring because the manifold/WG placement is garbage).

    That being said -- in cold weather (30-40* F) I make about 4.5psi (maybe 5psi at 8800 rpm), in warm weather (70+) it makes just about 4psi even at redline/rev limit. Keep in mind this isn't creep -- the turbo will hit 3psi @ 4k rpm and SLOWLY climb to 4.5psi @ rev limit (think supercharger boost).

    This is as perfect as it's going to get with the size of turbo I'm using. Then again most turbos that I've seen don't really want to spin for less than 4psi with ideal WG placement, and the WG spring is not "PSI", a 3psi WG is usually something like a .22-.25 bar spring, meaning with denser ambient atmosphere it's actually closer to a 4psi spring than a 3psi spring (hence the boost flux I see between cold/hot weather running on pure WG).

    All that being said, I can turn on the boost control just a tad and make a flat 6-8psi in 2nd gear from 4700 to 8800 rpm (depending how much I want to run), to as much as 25psi -- I haven't pushed the setup much past that, but 23psi at the track was only 44% duty cycle or so on my boost control. So safe to say 30psi+ on a 3 psi spring is possible



    More pics on http://myvtecbroke.com

  4. #24
    I <3 Purpul Shocker
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    Re: wastegate placement explained

    Quote Originally Posted by VitViper View Post
    I've seen K20 turbo kits that want to make 9psi on a 3psi WG spring because the manifold/WG placement is garbage).
    Blame Mo, not me. I just wanted a top mount. He said it wouldn't creep. :banghead:

    "As I lay rubber down to street, I pray for traction I can keep. But if I spin and begin to slide, please oh please protect my ride."

    One-off SRT Top Mount Manifold - GT3076R
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  5. #25
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    Well I was slightly mistaken

  6. #26
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    Quote Originally Posted by Si Speed 317 View Post
    Blame Mo, not me. I just wanted a top mount. He said it wouldn't creep. :banghead:
    It's not just you... the list continues to grow.

  7. #27
    Formerly "Adm_rsx"


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    wastegate placement explained

    [MENTION=789]VitViper[/MENTION] that manifold looks so sick. The size alone is making me think of going turbo instead of my charger.
    Last edited by PetefromtheStreets; 02-06-2013 at 08:47 PM.
    Tire slayer
    Breaking everything since 2011

  8. #28
    BoostedK20.com Founder

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    Stickied this thread


    Need parts for your k-series setup? Check out our eShop! Click Here

    For all your eShop support needs:BoostedK20.com eShop Support Forum

  9. #29
    Premium Member boosted_teg's Avatar
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    [MENTION=789]VitViper[/MENTION] is this manifold availible to the public or was it custom to you?
    2001 Boosted Built k20a2 Billet BB 6766BB

    2013=579whp 406trq @ 24 psi c16
    10.87@137mph

    2014= 510whp 370trq @ 18psi pump gas


    2015= 7xx @ 30psi??

  10. #30
    Formerly "Adm_rsx"


    PetefromtheStreets's Avatar
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    wastegate placement explained

    Quote Originally Posted by boosted_teg View Post
    [MENTION=789]VitViper[/MENTION] is this manifold availible to the public or was it custom to you?
    From lookin at the picture you guys had posted it said "burns" on it. So I'm assuming 1 of 2 things.

    1) they used a burns collector and gabbed the rest or

    2) burns stainless made it.

    Either if which are pretty freakin boss!

    I'd love to get one of those. Makes me want to sell my stuff and go huge turbo. Lol
    Tire slayer
    Breaking everything since 2011

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