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Thread: Testing wastegate/ boost creep

  1. #1
    Join Date
    Nov 2006
    Location
    Phoenix,AZ
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    477
    My Cars
    99' 323is, 99' 328is

    Testing wastegate/ boost creep

    I recently switched to a bottom mount manifold and have been driving for a few months normal city driving. I have been backing off the throttle when i see boost climb past 12lbs as i think it's going to creep past the wastegate spring of 14.5. I am not sure how high its going to creep and my tune for 91 gas may be at its limit past that. Would i be ok to put in 100 unleaded and see how much boost its making without changing my tune?

    She's built like a steakhouse but handles like a bistro

  2. #2
    Join Date
    Sep 2017
    Location
    Netherlands
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    30
    My Cars
    e36 328i turbo
    If you don't want it to go higher than 14.5 psi, why not switch to a lighter spring?
    get a 7/10psi spring, and use a boost controller to reach your desired boost pressure.
    If you want to know if your current wastegate spring opens your gate at 14.5psi, you can hook up a compressor to your wastegate and see if it opens with the compressor set at 14.5psi.

    with 100 your have less change on knock happening, which is nice.
    but I do not know enough about the rest of your setup to be able to say if you are ok with boosting past 14.5psi.

  3. #3
    Join Date
    Nov 2006
    Location
    Phoenix,AZ
    Posts
    477
    My Cars
    99' 323is, 99' 328is
    Its not that I don't want to go over the 14.5 spring it's just that I don't think its too good of an idea on 91 gas. Really just want to see what its going to do while being somewhat safe. Motor is built but I don't know if I can just dump higher octane gas and boost a bit higher? Local track has 100 unleaded so I was thinking I can do some testing at the track but not sure if I would need a whole new tune to do so.

    She's built like a steakhouse but handles like a bistro

  4. #4
    Join Date
    Aug 2007
    Location
    Vancouver, B.C., Canada
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    7,915
    My Cars
    '97 M3
    It depends on your tune. You can also mix in some e85 with the 91 to bring it up a bunch (to about 93 octane). I mix in about two gallons of e85 per tank full which allows me to up the boost about 4-5 psi. I had my tuner richer up the tune a bit to give me a bit of head room for AFRs. It runs a bit richer without it but Iím ok with that.
    Last edited by chikinhed; 02-09-2019 at 05:44 PM.

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