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Downsizing an HX40 Hotside.

Discussion in 'Turbo Tech Questions' started by throbbinV8, Jul 22, 2005.

  1. throbbinV8

    Joined:
    Oct 22, 2003
    Yes I did a search.

    OK, I'm running a Holset H1E/HX40 on my carbed 383SBC. Boost is around 11-12psi.

    Due to the stroker crank I'm keeping the revs conservative at 5000 max. Boost starts at around 2800rpm and hits 11-12psi by 3000rpm.

    However because I'm restricting my maximum revs I was wondering if I could run with a lower hotside AR without throttling the motor. Thus I could boost sooner without any downside.

    So my question is;

    Has anyone actually done, or do they know of any way to fit a lower AR hotside to an H1E/HX40? My current turbo has the standard 22cm housing. Has anyone encountered a smaller housing that is a straight forward bolt on?

    Many thanks.
     
    throbbinV8, Jul 22, 2005
    #1

  2. WaterPog

    Joined:
    Jan 23, 2003
    I know PDR sells 16 and 18cm housings for the HX-40 to use on the diesel trucks, you should try contacting them.

    As for if it will choke you off, tough to say w/o trying it. Good news is that exhaust housings are relatively cheap.
     
    WaterPog, Jul 22, 2005
    #2

  3. braxton357

    Joined:
    Sep 16, 2004
    What he said. Check out the cummins/dodge websites, the hx40 is a common upgrade.
     
    braxton357, Jul 22, 2005
    #3

  4. throbbinV8

    Joined:
    Oct 22, 2003
    Thanks for the info guys - I'll keep you posted if I get sorted.
     
    throbbinV8, Jul 23, 2005
    #4
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