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Turbo sizing

Discussion in 'Turbo Tech Questions' started by Mitch, Jun 13, 2022.

  1. Mitch

    Joined:
    Dec 29, 2014
    I have a boss block 308 (I know I should’ve gone bigger but I got the block/eagle crank/h beams/diamond pistons for like $2800cdn. So don’t lecture me on displacement)

    300cfm heads/spider intake/big solid roller .670lift etc

    currently have a T4 t76 bb q trim ITS turbo with 3”dp.

    haven’t been super impressed with the spool time. But it’s not terrible.

    Recently the turbo ate the air filter. So I need to buy a new turbo.

    I’ve heard the newer GT turbos spool much quicker.
    I’ve also heard the billet wheel turbos spool quicker and I see On3 has a billet wheel 76/75 T4 and a GT45. How would the spool time of these compare to my current t-76 qtrim?

    Or, Do you have any other recommendations?

    I’d ideally like to be around 700-800rwhp. It’s a street car so spool and fun is more important than numbers for me.
     
    Mitch, Jun 13, 2022
    #1

  2. B E N

    Joined:
    Nov 22, 2016
    Nothing wrong with 308", make up displacement with boost... that's what turbos are best at.

    82mm turbine s475 would do you well I think. 96mm turbine would get you a little further on the top end, but won't spool as well.
     
    B E N, Jun 13, 2022
    #2
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