How much do you actually need to port?
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This is a discussion on How much do you actually need to port? within the STi Technical Forum forums, part of the Tech & Modifying & General Repairs category; Well I was doing some thinking and my local mechanic could probably machine out however much needed on the wastegate ...

  1. #1
    Registered User StaticX313's Avatar
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    How much do you actually need to port?

    Well I was doing some thinking and my local mechanic could probably machine out however much needed on the wastegate side to keep it from creeping... so I was wondering , does anyone know how much they ported it out? pics? or anything? Thanks.

    Robert~

    Also... how much better does it feel? When I floor it with just a catback its almost like you can feel it trying to overboost, I just want a solid feeling so that Im not half throttling it to make sure i dont go over. Thanks.

    That and while I had the downpipe out I was goin to have him look at it.
    Last edited by StaticX313; 12-05-2003 at 07:16 AM.
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  3. #2
    Registered User Invisiguard's Avatar
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    hope this pic makes sense...
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  4. #3
    Registered User Invisiguard's Avatar
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    compare that open pic to where the wastgate sits closed, notice the amout of area that the wastegate covers when you look at both pics. its about 1/16" of seat area left, this is a deadbolt P+P
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  5. #4
    Registered User Daytona's Avatar
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    so I shouldn't just bust out the dremel to do this one?
    Is this extreme?
    Because I don't want to be a part of anything that's not extreme.

  6. #5
    Registered User Invisiguard's Avatar
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    definitly worth a shot for a DIY, they basically ported the wastegate, blended the exhaust outlet right next to it, and cleaned up the inlet area a bit, if you have a dremel with a few bits that can grind on cast iron and an afternoon to spare go for it, just be sure to leave that 1/16" area for the wastegate to seat
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  7. #6
    Registered User STiLL WILL's Avatar
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    Invisiguard,

    What kind of changes have you observed after the Deadbold PnP to the VF39? Fuel cut not a problem anymore?

    Thanks,
    -STiLL

  8. #7
    Registered User Daytona's Avatar
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    my idea was to mark what was to be removed with a marks-alot or possibly some wite-out if it wouldn't chip from being ground near.

    Great pics, I assume the blending you are talking about is reducing the bump between the wastegate port and the outlet? Was your inlet bumpy/full of burrs? I haven't taken mine off yet, but I assume you don't mean to increase the radius of your inlet...
    Is this extreme?
    Because I don't want to be a part of anything that's not extreme.

  9. #8
    Registered User Daytona's Avatar
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    ok, what is a deadbolt P+P, is that a new wastegate?

    <--- n00b to moding turbos
    Is this extreme?
    Because I don't want to be a part of anything that's not extreme.

  10. #9
    Registered User Invisiguard's Avatar
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    deadbolt is a company that sells upgraded turbos, they also Port and Polish tubos(p+p) the area Im talking about blending is right where the exhaust turbine outlet is right next to the wastegate, you can see in the pic how its a biy rough, thats where they radiused it a bit.
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  11. #10
    Registered User Invisiguard's Avatar
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    Originally posted by STiLL WILL
    Invisiguard,

    What kind of changes have you observed after the Deadbold PnP to the VF39? Fuel cut not a problem anymore?

    Thanks,
    -STiLL
    well it just got a couple days ago and its still sitting on the floor, its going in as soon as I get my DP and fab and extra pipe for this

    I'll report back how it goes
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  12. #11
    Registered User sk1CL-S's Avatar
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    Originally posted by Invisiguard
    compare that open pic to where the wastgate sits closed, notice the amout of area that the wastegate covers when you look at both pics. its about 1/16" of seat area left, this is a deadbolt P+P
    Hey, is that a cracked near the wastegate flapper?
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  13. #12
    Registered User StoplightWarrior's Avatar
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    What does porting the wastegate accomplish exactly?
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  14. #13
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    Originally posted by StoplightWarrior
    What does porting the wastegate accomplish exactly?
    It improves the flow of exhaust gas through the wastegate, the actual diameter of the wastegate hole is increased, thus reducing resistance. Also flow out of the turbine is improved by removing some sharp edges around the wheel, this reduces turbulence. Hopefully, the wastegate porting will keep boost creep to a minumum. A common problem on the STi is exhaust gas flowing through the turbine rather than the wastegate at higher rpms when the wastegate is fully opened, this makes the boost pressure creep up as the turbine wheel has to spin faster.
    Last edited by supermarkus; 12-06-2003 at 11:28 AM.
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  15. #14
    Registered User g0tb00st's Avatar
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    Originally posted by StoplightWarrior
    What does porting the wastegate accomplish exactly?
    Eliminates the dreaded boost creep issue many STi owners are facing when they are running a more free flowing exhuast setup.

  16. #15
    Registered User StoplightWarrior's Avatar
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    is boost creep when your boost builds up and cuts out? Cant a reprogrammed computer fix that?
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