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Thread: Question regarding raising psi from 9-10 to 12ish for vortech v3 si with s52b32

  1. #1
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    Question regarding raising psi from 9-10 to 12ish for vortech v3 si with s52b32

    (I edited the post so it is more concise.)

    Hello,

    Can anyone please let me know how much whp/chp the s52b32 engine is good for without going out of its limit? And if it does, what are the things to what out for?

    I am currently running about 9-10psi with 3.33 pulley and VF's vortech v3 si (about 351whp) with custom tune; the engine is running very smoothly. No heat soak. And no sign of running lean (slightly rich actually). But I've been thinking about switching to 3.15 pulley which will raise to about 11-12 psi (I'm hoping to reach 400whp potentially which is also my whp goal).

    Any suggestion or advise would be appreciated very much, TIA!
    Last edited by nevan; 08-02-2018 at 06:56 PM.
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  2. #2
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    So first of all, getting a belt to grip a 3.15'' pulley might be a project. You may need a lot of tension or an idler to wrap around it. Is a 3.15 a standard upgrade on this car or is this custom?
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  3. #3
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    Quote Originally Posted by mcgnms View Post
    So first of all, getting a belt to grip a 3.15'' pulley might be a project. You may need a lot of tension or an idler to wrap around it. Is a 3.15 a standard upgrade on this car or is this custom?
    3.66 was the standard on mine, and I replaced it with 3.33. Since then, I have switched the tensioner (spring type), idler and belt to counter balance the grip.

    As you mentioned, I am guessing I probably would need to do something similar this time as well.

    I did some additional research since the original post, and it seems stock s52b32 motor is able to handle safely upto 450whp (or similar in wtq) with an assumption that afr and cooling are well balanced (not including tranny, drivetrain, and axles into a consideration). Does it sound right? Thanks again!
    Last edited by nevan; 08-07-2018 at 12:43 AM.
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    What charge cooling do you have? Detonation will be your enemy.

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    Quote Originally Posted by chikinhed View Post
    What charge cooling do you have? Detonation will be your enemy.
    Yes, I will definitely have to watch the denotation until the motor is properly dialed-in.

    Aside from the radiator and clutch fan (will be replacing it with a electric fan when radiator is due for replacement), I only have indirect cooling method with an oil cooler (oil temp is consistently just shy of 200F) with richer fuel. It's worked until now. And I was going to continue with the same approach (I believe there is still more room to adjust). I'm trying to see if I can get it to work without adding a "custom" intercooler... But I'm also unsure how it will handle additional boost... Thanks again!
    Last edited by nevan; 08-08-2018 at 05:21 PM.
    2000 Z3 M Titanium Silver / Imola Red+Black Nappa
    2011 328i E92 Space Gray Metallic / Leder Dakota+Oyster
    Since 1987 12 euros / 2 kdms / 2 jdms
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