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second fuel pump switched for boost

Discussion in 'LS1, LS2, LS6, LT1, SBC Turbo and other GM Specfic Turbo Tech' started by fxbdydriver, Mar 3, 2015.

  1. fxbdydriver

    Joined:
    Nov 26, 2013
    Hey guys,
    Building my first turbo car... My 6.0 lq4 with bw s475 e85 non intercooled. I have a holley dominator fuel pump which is actually two pumps in one, with two separate trigger wires. Pump is louder when both are running so I was considering having the second come on when necessary. Somehow referencing boost? How can this be done safely?
     
    fxbdydriver, Mar 3, 2015
    #1

  2. 91turboterror

    Joined:
    Mar 17, 2013
    With a Hobbs switch
     
    91turboterror, Mar 3, 2015
    #2

  3. M&M Turbochargers

    Joined:
    Jan 31, 2011
    i would consult with holley and see if running one side would hurt the pump, place a hobbs switch(pressure switch) in the cold side, or may be able to trigger with a map sensor

    the summit catalog states you can run one then when racing can turn on the other
     
    M&M Turbochargers, Mar 3, 2015
    #3

  4. H.P.Ranch

    Joined:
    Sep 2, 2011
    Just a reminder when running E85 the pump is limited to 70% of the h.p. it can supply on gas. Something I forgot when switching from 93oct. to E85.:encouragement:
     
    H.P.Ranch, Mar 3, 2015
    #4

  5. Turbo-Box

    Joined:
    Apr 23, 2004
    What are you running for engine management? You can configure an output on most EFI systems to turn on the pump when the TPS gets over a certain percentage. That's what I'm planning to do.
     
    Turbo-Box, Mar 3, 2015
    #5

  6. fxbdydriver

    Joined:
    Nov 26, 2013
    I have microsquirt for engine management. I have one output for fuel pump, unsure if another output is available for second.
     
    fxbdydriver, Mar 4, 2015
    #6

  7. alain

    Joined:
    Mar 6, 2007
    I run a ViPEC ecu and have two Bosch pumps in my twin turbo Dart. I run one pump while cruising (which I switch (electrically) after every drive to ensure equal operating hours on both pumps) and the second comes on after meeting one of 2 requirements I programmed in:
    1. TP over 60%
    2. Boost (reference from the MAP sensor) is more than 2psi.
     
    alain, Mar 4, 2015
    #7

  8. 20psiofevil

    Joined:
    Nov 4, 2013
    I run my 2nd pump wired to a nason sq boost switch to come on at 5psi boost.
     
    20psiofevil, Mar 4, 2015
    #8

  9. alain

    Joined:
    Mar 6, 2007
    ...oh, I just remembered I have a third parameter programmed in and that's injector duty cycle is over 40%.
     
    alain, Mar 5, 2015
    #9
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