Turbo sizing help

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  1. #1
    Senior Member Array RussZTT's Avatar
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    Default Turbo sizing help

    Background on engine:


    4.6 Teksid standard bore and stroke
    11.1 compression
    E85
    Turbo cams
    Ported heads (shift no more than 8.5K)
    Sully lower (not sure on upper just yet)
    Running W2A
    Rossler TH400


    Before I start calling different turbo companies that will try and sell me their turbo I wanted to get opinions first. Iím not sure on single or twins. My goal is around 1,400rwhp. Iíd like to run some NMRA classes, thinking the Cobra/GT500 and the street class but also will be a fun weekend car. Did some reading and searching here and got some ideas but wanted to ask thatís more to my setup.


    Thanks!


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    How much money do you want to spend? Garrett, precision money? Or borg warner money? On a 4.6 with 10.8 compression, ported heads, custom cams, Sullivan lower, and a th400 I made 1232whp with a borg warner 8596 with a 1.24 turbine housing on 25psi. Probably could have made over 1300whp if I turned it up some more. A 8896 borg will probably get you there. A garrett 5518r will get you there or a precision promod 88 will get you there. And mine was through a t4 flange

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  4. #3

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    Wish I had some insight for you, Im still trying to learn these Mod motors. But other than when I switched on my 5.3 from a batmowheel 83 to twin S366s lb for lb boost the twins made more power.

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    So you want twins? Or single turbo? Seems like the go to on twins would be some s369's or precision 6466 or 6766. All depends on budget. Reed at work turbo chargers is a good guy to talk to. He does not mind converting on the phone about what will work. Jose at forced induction is good also

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    Last edited by cobranick123; 03-08-2019 at 08:30 AM.

  7. #5
    Senior Member Array RussZTT's Avatar
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    Thank you sir. Iím not sure on single vs twins just yet. Iíll give them a call and pick their brain.

  8. #6
    Senior Member Array badcobra's Avatar
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    Twins will make more power so I'd go with twin Precision 6870's. But if you plan to run heads up, need to check the rules in each organization as they may have turbo limits.

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    6870's will definitely get you there. Those are badass turbos for sure

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