how to make turbo spool faster

Posted by spawn87, May 25, 2009
Newbie Forum - Beginner/newbie/general DSM modification questions. First mods, how to run 10's when you haven't run 12's yet, any tech question that doesn't fit in another tech forum. Probationary Members must limit their tech posts to this forum and sub-forums.

  1. spawn87

    spawn87 Proven Member

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    sacramento, California
    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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    Indianapolis, Indiana
    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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    Miami, Florida
    +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.
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  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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    sacramento, California
    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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