how to make turbo spool faster

Posted by spawn87, May 25, 2009
Newbie Forum - Beginner DSM modification questions and discussions. Common, repetitive, and general discussions will get dumped here from other tech forums. Unless you're a Probationary member you shouldn't post threads here.

  1. spawn87

    spawn87 Proven Member

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    i have a ported 14b with ss o2 housing and 3inch exhaust but im still not feeling pull till 3500 rpms... my question is how can i make it so it will spool or get it to pull faster?:hmm:

    port the hotside some more?
    tubular header?
    or a MAFT set up?
    #1
  2. My1GLaser

    My1GLaser Proven Member

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    Search shimming the wastegate or something similar. It sounds like the flapper is hung open slightly. That thing should be in full boost by 3k.
    #2
  3. habitatguy187

    habitatguy187 Proven Member

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    My non ported 14b spikes to 20psi at 2800rpms, check for boost leaks, if you don't have any then either have exhaust leaks pre-turbo or your wastegate is opening prematurely.
    #3
  4. Dsmj89

    Dsmj89 Proven Member

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    I agree with the guys above. Try spraying some wd40 around the wastegate flapper arm area, let it sit for 5 minutes, and take it for a spin and see if that helps unstick the arm.
    Those turbos as stated should be spooled around the 2800-3200 rpm range.
    If yours isn't spooling until after then you have some good pre-turbo exhuast leaks. Make sure all your bolts are nice and tight and that your gaskets aren't bad either.
    #4
  5. habitatguy187

    habitatguy187 Proven Member

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    But it's more likely that you have boost leaks, do a boost leak test first, it should be regular maintenance on a turbo car.
    #5
  6. Dsmj89

    Dsmj89 Proven Member

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    +1. These intercooler hoses are old and worn down and tend to start tearing and cracking over the years of use. Do a boost leak test asap.
    #6
  7. jrohner

    jrohner Proven Member

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    An exhaust/wastegate leak makes a lot bigger difference than any boost leak.

    Make sure you have no exhaust leaks, if you don't you may have a cracked turbine housing by the wastegate flapper. It could also be a boost controller issue, or your cam timing could be off.
    #7
  8. spawn87

    spawn87 Proven Member

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    well i know its not the timing cause i just got everything done at a my friends shop... and when i ported the housing the cracks were minor but i might of ported the w/g outlet a little to much that could be the problem...:hmm:

    and i also know its not the exhaust cause i just had it checked and put new seals everywhere

    but i think if i shimm the w/g and spray it with wd40 it might be a good place to start

    i will boost leach tested tomorrow at work and let you know how it went

    thanx guys:thumb:
    #8
  9. siceclipse

    siceclipse Proven Member

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    Ive got 5 bucks that says its a boost leak.
    #9
  10. toofast82

    toofast82 Proven Member

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    I'll pm you my Paypal account info:D
    But yeah as said do a boost leak test, double check there is no pre-turbo exhaust leaks
    Have you done any porting to the turbine housing or manifold?
    #10
  11. spawn87

    spawn87 Proven Member

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    i only ported the hotside of the turbo
    #11
  12. toofast82

    toofast82 Proven Member

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    I would port the manifold collector, like remove the step for sealing ring as well if its not done on turbine housing.
    Check out vfaq.com for some how-tos.

    Originally you said that you're " not feeling pull till 3500rpms" Could you be more specific in terms of psi/rpm?
    #12
  13. spawn87

    spawn87 Proven Member

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    what i mean by this is that i don't feel the turbo kick int till about 3500 rpm... i have it set at 15psi...

    i ran a boost leak and Nada everything is OK...so i shimmed the w/g and wd40 the actuator arm but have not ran it yet cause my radiator cap broke and need to get a new one... i will post on this later on today to see if i might have fixed the problem

    for what ive read i expect to feel the car pull at about 3k.
    #13
  14. DyNamiC

    DyNamiC Proven Member

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    Something is up, you should feel pull before 3k with the 14b. What psi did you test to when you did the boost leak test?
    #14
  15. toofast82

    toofast82 Proven Member

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    Feeling pull and "peak torque" are two different things. Yes the 14b should spools very fast and should definitely hit full boost in 3-3500rpm area. Peak torque will occur later in the rpm band though.

    To the OP: What gear are we talking about? If you are at WOT at a low rpm, Where are you hitting your 15psi?
    #15
  16. spawn87

    spawn87 Proven Member

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    i tested the system to 18psi

    im running 15psi and i hit that at about 3200-3500 rpm

    after that i feel peak torque at about 4k

    so if what you say is true then im doing ok then:p
    #16
  17. toofast82

    toofast82 Proven Member

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    Sounds about right.
    You may be able to cut that down a bit with porting the inlet of turbo and collector of manifold. It may be hardly noticabe though.
    If you had a fuel/timing management system, you could tweak some more out of it, too.
    #17

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