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Will switching from a .68 AR to a .58 AR turbine make a big change?

Discussion in 'Turbo Tech Questions' started by JSTFORFN, Oct 5, 2008.

  1. JSTFORFN

    Joined:
    Jul 30, 2007
    I'm running a pair of 62-1's with T4 turbine housings on a 5.4l (331 cu) Ford. They currently have .68 AR's and I'm not getting full boost till around 4200 rpm's. When I built the combo I was hoping for 3600-3700 rpm's for full boost. My question is if I drop to a .58 AR turbine housings would it give me a 400-500 rpm drop in full boost response ?
    I have my EBC setup to were it brings on boost as fast as possible without spiking.

    Thanks Mike
     
    JSTFORFN, Oct 5, 2008
    #1

  2. the608

    Joined:
    Jan 27, 2008
    Hi,
    Dropping down a size will bring boost on about 300 rpm earlier,but .68 a/r housings are getting to the small side of things,what size exhaust wheels you running ?

    Theo
     
    the608, Nov 5, 2008
    #2
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