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what size?

Discussion in 'LS1, LS2, LS6, LT1, SBC Turbo and other GM Specfic Turbo Tech' started by slowolds, Jul 14, 2008.

  1. slowolds

    Joined:
    Feb 2, 2008
    what size turbo would be good for a sbc 406 with aluminum heads. thanks
     
    slowolds, Jul 14, 2008
    #1

  2. Robert1320

    Joined:
    Jun 20, 2005
    How much HP you want?
     
    Robert1320, Jul 14, 2008
    #2

  3. 86lx

    Joined:
    Dec 26, 2019
    only 800
     
    86lx, Aug 10, 2020
    #3

  4. B E N

    Joined:
    Nov 22, 2016
    How much power does it make NA? Street or track?
     
    B E N, Aug 11, 2020
    #4

  5. 86lx

    Joined:
    Dec 26, 2019
    500 hp and street driven...single turbo...t4 preferable. thx in advance
     
    86lx, Aug 11, 2020
    #5

  6. Mnlx

    Joined:
    Sep 20, 2009
    Something in the 80mm range. A S480 with the 96mm 1.32 is the first thing that comes to mind for me, but it would get a T6 flange if its possible.
     
    Mnlx, Aug 11, 2020
    #6

  7. 86lx

    Joined:
    Dec 26, 2019
    thx, that was what i thought..it's a T6, my turbo is sitting on a T4. i hope they make an adaptor
    , lol
     
    86lx, Aug 11, 2020
    #7

  8. B E N

    Joined:
    Nov 22, 2016
    s475 should do it for 800hp on the street, s480 would give room to grow, t6 96mm exhaust wheel.
     
    B E N, Aug 12, 2020
    #8
    86lx likes this.

  9. 86lx

    Joined:
    Dec 26, 2019
    Thx, ben. That is a great turbo, but I would literally have to change everything, especially on the hot side. I'm thinking e bay gt45 would be my best bet. I know everybody thinks e bay stuff is junk, but I'm still experimenting, and I want to keep the test costs down, lol. Looks like I'm going to scrap a perfectly good T70 because it is just too small
     
    86lx, Aug 13, 2020
    #9

  10. Mnlx

    Joined:
    Sep 20, 2009
    Your 500 na hp is what dictates a large compressor (and turbine). The gt45 has a decent turbine, but the 69mm old school compressor is going to really struggle if your na hp numbers are legit. Even the 475's much more modern compressor would be in or beyond the far right efficiency island at that hp. Not that you can't make hp with the 45, but it will limit your hp potential, and may give up a little sooner being pushed to its limit.
     
    Mnlx, Aug 13, 2020
    #10

  11. B E N

    Joined:
    Nov 22, 2016
    Is twin t70 an option for you? Might be an alright match, you'd only need one more. It does double the cost of wastegates though :/
     
    B E N, Aug 14, 2020
    #11

  12. 86lx

    Joined:
    Dec 26, 2019
    yes, i know. the matchbot maxed out and the no. 6 dot would not get on the map, and that turbo was like over $3,000. can't afford it. the small T70 is fun for a little while, but poops out pretty fast. i may tear the whole thing out in a year or so. should have done my homework, and gone twins. oh, well, you live and learn. thx for taking the time to respond in detail
     
    86lx, Aug 14, 2020
    #12

  13. Mnlx

    Joined:
    Sep 20, 2009
    You don't need a $3000 turbo, a genuine s475 can be bought for 600 or 900-1k for an 80mm. Also, there's always the China versions. The 475 can also be upgraded to an 80 down the road if you choose.
     
    Mnlx, Aug 15, 2020
    #13
    B E N likes this.

  14. Forcefed86

    Joined:
    Nov 24, 2005
    Forcefed86, Aug 24, 2020
    #14
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