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boost creep at higher rpms

Discussion in 'Forced Induction' started by 95EGCoupeVtec, Nov 27, 2009.

  1. 95EGCoupeVtec

    95EGCoupeVtec SOHC VTEC at its best

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    so i got everything running perfect finally on my car. it pulls hard as fuck. only problem is, after about 5200rpm in 3rd gear pulling 9psi, the boost starts to wobble back and forth closer to 10 psi then it hitss 11psi and of course the map freaks out. now it did alot colder here the temp dropped alot and i set my boost controller during the summer. could that be causing my creep? also, my WG source line comes form my turbo to WG, but i have a plastic vaccuum line connector in the middle of it. could boost be leaking out of there and causing it to creep? the car pulls fine in 1st and 2nd, thought they go by too fast and i bounce off the limiter haha.
     
  2. Briansol

    Briansol Admins Admin VIP

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    how in your mani set up for wastegate placememnt?
     
  3. civicious

    civicious FüK-VTEC VIP

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    The Go-Autoworks cast manifold:

    [​IMG]


    ....ick
     
  4. 95EGCoupeVtec

    95EGCoupeVtec SOHC VTEC at its best

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    yeah thats the one i have.
     
  5. 97hatch

    97hatch ?

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    waste gate placement is mostlikely the cause of the boost creep here what kind of waste gate do you have also
     
  6. civicious

    civicious FüK-VTEC VIP

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    according to his signature, it's a 38mm Tial
     
  7. 97hatch

    97hatch ?

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    is it a real or fake tial is the guestion to ask then i guess
     
  8. 95EGCoupeVtec

    95EGCoupeVtec SOHC VTEC at its best

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    its a real tial. also, if a 1/8 flare fitting fits fine into my oil feed line, what -AN fitting size would i need? i'm trying to get a dang oil restrictor and idk if its -4 or -3.
     
  9. Briansol

    Briansol Admins Admin VIP

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    the manifold is the problem. it basically gets 90% of its reading from 1 runner, not all 4.

    The only way to really fix this is to get a manifold that isn't a 1982 design.
     
  10. Briansol

    Briansol Admins Admin VIP

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    and -3 is the correct feed line size... not sure that it will fit your connectoe though.
     
  11. 95EGCoupeVtec

    95EGCoupeVtec SOHC VTEC at its best

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    lol u made me laugh.
     
  12. civicious

    civicious FüK-VTEC VIP

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    it's funny but it's true.
     
  13. 95EGCoupeVtec

    95EGCoupeVtec SOHC VTEC at its best

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    honestly, idk if it was boost creep and my ecu freaking out bc of a stock MAP sensor OR if i hit the rev limiter. it hasn't done it since this one time.
     
  14. civicious

    civicious FüK-VTEC VIP

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    either way, that's still a crap manifold design.
     
  15. DESPAIN

    DESPAIN yep....mmhhm.......yep...

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    The mani should be"ok" for 9-10psi boost.
     
  16. Briansol

    Briansol Admins Admin VIP

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    might've had a lose vac line or something too...
     
  17. 95EGCoupeVtec

    95EGCoupeVtec SOHC VTEC at its best

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    well its doing it again. i'm thinking there is a small leak where the banjo fitting screws into the wastegate. OR that the rush of additional air when the vtec hits could make it slow to respond. i'm thinking the banjo fitting going into the wastegate.
     
  18. civicious

    civicious FüK-VTEC VIP

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    ...or it's the manifold
     
  19. Matts96HB

    Matts96HB . Moderator VIP

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    Completely irrelevant, but ok.
    My first vote is this.
    Check everything for leaks and if everything checks out okay..
    .. then this is the problem.

    Look into something nicer anyway, especially if you are looking to make decent power.
     
  20. 95EGCoupeVtec

    95EGCoupeVtec SOHC VTEC at its best

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    for right now i'm fine with this cast manifold. what i would like to do is get a spare z6 block and go vitara/eagle and then upgrade to a mini ram or full ram. and as far as the vacuum lines go, which would would i check? the one going from the turbo pressure nipple to the wastegate, the line for its measurement?
     
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