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horse power ideas?

This is a discussion on horse power ideas? within the Forced Induction forums, part of the LSx Technical Help Section category; I have recently purchased a borg warner st78mm turbo to go on my 5 over bored 347 I have the ...

  1. #1
    grand poobha james schofield's Avatar
    Join Date
    Oct 2008

    1999 trans am

    horse power ideas?

    I have recently purchased a borg warner st78mm turbo to go on my 5 over bored 347 I have the stock crank and eagle H beam rods and wiseco pistons ported and polished heads, my compression ratio is 10.81 :1 so I will only run 8psi. just wondering what the possible power will be, I will be running a kenne bell boost a pump, and a boost a spark, 60psi injectors, 2bar speed density.
    any input would be greatly appreciated.

  2. #2
    Member Lawnboy's Avatar
    Join Date
    Mar 2007

    01 SS Built LS6 740RWHP

    I think a smaller turbo will work spool up better/faster, and since your only shooting for 8 psi a big 78 isnt necessary.

    A 66 is a nice turbo, if it was me i would go ball bearning

    with 10.8 to 1 , methanol injection all the way

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