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newbie down pipe size question

Discussion in 'Newbie and Basic Turbo Tech Forum' started by 66lswagon, Nov 24, 2017.

  1. 66lswagon

    Joined:
    Nov 24, 2017
    New to turbo builds here is my setup. 4.8 LS with single VS racing billet 7875, 1966 Nova wagon 3200 pound car 600hp range, will run a fender dump exhaust on a cutout and a full exhaust either single or dual. What size downpipe do I need also what size exhaust? the outlet on the turbo is 3 inches. thanks
     
    66lswagon, Nov 24, 2017
    #1

  2. Mnlx

    Joined:
    Sep 20, 2009
    General rule of thumb for down pipe is turbine wheel exducer x 1.25 or about 3.750 in your case" You can fudge it a little, but it would be nice to see at least a 3.5". Dual 2.5 for exh. Some have run a single 3" on something similar, but it does cost some hp. Check out Matt at sloppy mechanics, he has a 4.8 7875 combo and he just did some back to back exh dyno comparisons.
     
    Mnlx, Nov 24, 2017
    #2

  3. 66lswagon

    Joined:
    Nov 24, 2017
    IMG_2775.JPG #ad
    Went with 4 inch thanks
     
    66lswagon, Dec 17, 2017
    #3

  4. Mudduck72

    Joined:
    Mar 3, 2018
    Did you end up running your dual exhaust if so how did you do your split from 4 to 2.5
     
    Mudduck72, Mar 4, 2018
    #4
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