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1.25 to 1.10

Discussion in 'Turbo Tech Questions' started by 3 window, Mar 28, 2017.

  1. 3 window

    Joined:
    Oct 14, 2015
    Quick question. I have an s475/83 with a t4 1.25 housing on my 5.3 right now. Engine has a set of 243 heads, JFR 218 cam, truck intake and flipped manifolds. I usually rev it to 6500 an wonder if I could get a little more "oomph" by going to a 1.10 housing? I just don't want to choke this thing out at 6500. I've run it at 17 psi so far and the IATs aren't bad but I'd like to push it up to 20 this year. That'd be tops. Do you think the 1.10 housing is worth it? If so, what could I expect?
     
    3 window, Mar 28, 2017
    #1

  2. 434chevelle

    Joined:
    Sep 5, 2011
    I went from 1.10 to .9 a/r on twin t4 s467s. I didn't notice much of anything. Maybe 200 rpm difference in spool and felt a little weaker up top.
     
    434chevelle, Mar 29, 2017
    #2

  3. Forcefed86

    Joined:
    Nov 24, 2005
    Unless it's not responsive enough for you a smaller housing won't make more power. It will give more response and less "oomph". If you want more power put in a larger am and a T6 S480. :)
     
    Forcefed86, Mar 29, 2017
    #3
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