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Thread: Antisurge/Ported Shrouds

  1. #21
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    Default Re: Antisurge/Ported Shrouds

    Quote Originally Posted by slowmedown View Post
    Im still learning about turbos/surging but am i correct in assuming if i run my stock (responsive BOV) with an aftermarket BOV like a Tial will this prevent surging?
    Nope! And what's your logic behind one recirc bov and one non recirc bov?

  2. #22
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    Default Re: Antisurge/Ported Shrouds

    In this pic of my billet turbo you can just barely see the port line. It is just above the smaller set of fins, but below the larger ones.

    My BOV is adjustable and I was able to only put a small amount of spring pressure on it so it opens and vents low boost very easily, but still holds 24psi without leaking.

  3. #23
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    Default Re: Antisurge/Ported Shrouds

    Quote Originally Posted by Doward View Post
    Look at the location - you're not in the 'pressurized' portion of the intake - you're just inside the inlet where compression begins.

    Tissimo, you've got back to back runs to show this?
    There are several runs on SF where non surge covers make more power. If you think about it it makes perfect sense, the turbo can only flow so much, if you induce a leak (surge port) the air will leak through there and less flow reaches the engine.

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  4. #24
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    Default Re: Antisurge/Ported Shrouds

    Links?

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    Default Re: Antisurge/Ported Shrouds

    How big is the difference on average? 1%? 5%?

  6. #26
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    Default Re: Antisurge/Ported Shrouds

    Quote Originally Posted by Doward View Post
    Links?
    I'll look later tonight. But garrett states that you'll have a minor impact on efficiency.
    Quote Originally Posted by tekdeus View Post
    How big is the difference on average? 1%? 5%?
    I would say less then 5%, more in the 2-3 range.


    With small turbos there is no reason to run a ported cover. But if you have a larger turbo, it (having a ported cover) would out weigh the benefits of a non ported cover however.

    I'm not sure where the 7m starts running into surging problems. My 1jz with a 67 would surge just a tad in 5th ~ 4000 or so.

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  7. #27
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    Default Re: Antisurge/Ported Shrouds

    in response to the video:
    i don't understand it. what are they doing throttle wise just to make it surge like that? They said they closed the bovs to ensure that they were not a factor, but that in itself is the factor to me. If the excess air cannot be released then of course its going to surge like that.. i'm so lost.

  8. #28
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    Default Re: Antisurge/Ported Shrouds

    it's a normal dyno run, so it's WOT...
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  9. #29
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    Default Re: Antisurge/Ported Shrouds

    Quote Originally Posted by Supra_Villan View Post
    in response to the video:
    i don't understand it. what are they doing throttle wise just to make it surge like that? They said they closed the bovs to ensure that they were not a factor, but that in itself is the factor to me. If the excess air cannot be released then of course its going to surge like that.. i'm so lost.
    It's really simple man...don't over analize it! That particular turbo is pumping more air then the motor wants...therefor the pressure wants to excape and it only has two places to go....either the motor takes it or the air backs up and forces itself back out the turbo....

    The other type of surge is when the throttle closes and all that fast moving air and pressure bounces back and reverses travel towards the turbo....which is why gas motors have bypass valves, blow off valves, and or some crazy badass shit antilag system that routs that air into the exhaust mani....

    The ported shrouds let you force even more air in as it has en escape route for air....the turbo sucks it back in ofcourse as to not create a boost leak.

  10. #30
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    Default Re: Antisurge/Ported Shrouds

    It's even more involved than that, it's closer to cavitation...
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