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VS Racing 78/75 vs On3 76/75 BMF Questions

Discussion in 'Ford Modular Forum' started by Nardo4vGt, Sep 25, 2020.

  1. Nardo4vGt

    Joined:
    Sep 25, 2020
    4.6 c headed 4 valve stick car
    9.5:1
    Forged + studded with mhs valve springs
    Stock cams
    Stock ecu
    E85

    I’ve been searching a few months now and most of the info I’ve found on these turbos has been ls related. Is there anyone here willing to share their graphs of either turbo on a 4v 4.6? Or help me decide between the .96 ar housing of the on3 vs the 1.25 of the vsr. Shooting for 800+ to the wheels for now
     
    Nardo4vGt, Sep 25, 2020
    #1

  2. B E N

    Joined:
    Nov 22, 2016
    Either which turbo?
     
    B E N, Sep 27, 2020
    #2

  3. Nardo4vGt

    Joined:
    Sep 25, 2020
    On3’s 76/75 .96 ar and Vsr’s 78/75 gen 3 1.25 divided ar

    wondering if I’ll run into backpressure issues with the .96 ar or spool issues with the 1.25 ar since the car is a manual
     
    Nardo4vGt, Sep 27, 2020
    #3

  4. B E N

    Joined:
    Nov 22, 2016
    Sorry for the redundant question, my powers of observation failed!

    The 7675 will exceed 900hp at the wheels on the 4.6l. I would run the smallest A/R available.
     
    B E N, Sep 28, 2020
    #4

  5. Nardo4vGt

    Joined:
    Sep 25, 2020
    Sounds like a plan, thanks for the help!
     
    Nardo4vGt, Oct 4, 2020
    #5
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