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Thread: S257SX-E .82/83: Am i making a mistake?

  1. #1
    Join Date
    May 2007
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    Florida
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    2,083
    My Cars
    '87 325is 24v turbo buil

    S257SX-E .82 a/r: Am i making a mistake?

    Hey everyone, i am nearly finished with my turbo m52b28 e30 build, and at the last minute i realized my hy35 just isn't going to work due to compressor housing not meeting up properly with the manifold, etc. (I hadn't tried actually bolting it on, just sat it on for mock up purposes, don't flame me)

    I am building a weekend track/street car looking for 350-450whp. I am looking for a fairly quick spool and the most power under the curve possible. I was recommended the Borg Warner s257sxe, but wasn't recommended a turbine housing size. I am thinking an .82 a/r as i have a rapid spool/good and tight manifold and this looks to be the right size. I am trying to make a quick decision as i was looking to start the car this weekend, though that clearly isn't happening...

    Am i making a mistake here? Are my IAT's going to be too high on the track? Am i picking the right turbine size?

    Thanks in advance.

    - - - Updated - - -

    also, the title was supposed to say .82 a/r, but i can't edit it apparently...
    Last edited by SS Ball3r; 01-10-2019 at 07:31 PM.

  2. #2
    Join Date
    Nov 2013
    Location
    Gerrrmany
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    386
    My Cars
    E34 Turbo

  3. #3
    Join Date
    Jul 2008
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    FL
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    4,297
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    are slow.
    Should be fine with a .82 A/R. With a S257sxe expect full boost really quick though, and in an e30 that much torque so early on is going to be a handful in the lower gears lol.
    "Be who you are and say what you feel because those who mind don't matter and those who matter don't mind."
    -Dr. Seuss
    DIY BMW Tools. Charlie For President

  4. #4
    Join Date
    May 2007
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    Florida
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    '87 325is 24v turbo buil
    I hope so! I am running 245's with sticky rubber. I plan on doing full aero for track use and everything else i can do to add grip (mechanical and aero)

  5. #5
    Join Date
    Feb 2012
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    Birmingham, Alabama, USA
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    1995 BMW M3
    Will be great. I had a s256sx on an s52 that tapped out at 465. A 257sxe will do north of 500. Will be a great turbo for your intended use.

  6. #6
    Join Date
    May 2007
    Location
    Florida
    Posts
    2,083
    My Cars
    '87 325is 24v turbo buil
    Thanks everyone for the feedback. Turns out one of the places I was considering ordering from is local, so hopefully I can pick up this turbo today.

  7. #7
    Join Date
    Apr 2006
    Location
    Minnesota eh?
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    5,627
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    86 325es
    Sounds like a good match for the goals to me.


    86 325es, 2.8L m50, S472sxe, MS3pro Ultimate, e85, solid rear axle, 4 link, spool, TH400 trans, Protorque converter, 28x10.5w slicks, zip ties
    Best = 9.43 @ 149.15 mph, 1.30 60 foot 28 psi boost

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