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383, unhappy with new setup, thinking about a/r change

Discussion in 'Turbo Tech Questions' started by actmobmar, Aug 25, 2020.

  1. actmobmar

    Joined:
    Oct 9, 2010
    So I changed up my engine combination, went from brodix track 1(250 cfm @600) to brodix Dragonslayer (305 cfm @ 600), changed turbos (CX racing gt 35, t3 exhaust housing . 63 at) to vs racing ball bearing 62's, t4 housing, .84 ar). Torque converter has been changed also, went from a 3500 stall 9.5", to a 3500 stall 10". Car used to be able to build 5 psi on the footbrake with the old combination, new combination has no boost on the footbrake. I also have a transbrake, and have been trying to figure out launch rpm, currently at 3800, but it has no boost. If I remove the rpm limit on the brake it's seems that it's all in (10 psi setting) by 4200, and converter will go up to 4600. So I'm debating on going with different exhaust housings (drop to 72 ar), or go back to a 9.5" converter. Any suggestions? Also these are twins. Thanks!!
     
    actmobmar, Aug 25, 2020
    #1

  2. tbird

    Joined:
    Sep 1, 2004
    If you need the rpm on the brake to build boost than use it.
    Going down in a/r is going to be minimal change and will possibly hurt power potential.
     
    tbird, Aug 25, 2020
    #2
    B E N and actmobmar like this.

  3. B E N

    Joined:
    Nov 22, 2016
    Did you increase down pipe size to match the larger turbo?
     
    B E N, Aug 25, 2020
    #3

  4. actmobmar

    Joined:
    Oct 9, 2010
    It actually stayed the same from the gt35 setup, 3"
     
    actmobmar, Sep 2, 2020
    #4

  5. patl

    Joined:
    Jun 6, 2009
    No offence, but what did it do when you let go at 4200?
     
    patl, Sep 8, 2020
    #5
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