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  1. #1
    pass1's Avatar
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    How much pressure??

    Hi guy's!!

    Just want to know what is the maximum pressure the stock fuel pump and stock bosh 42# injectors can handle??
    Asking cause If I set my rrfpr at 55 psi base pressure and boosting 12 psi the fuel pressure will then raise to 67 psi. How much more can they handle??

    Thanks!!


  2. #2
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    70+ is where you'll start to have issues with the fuel pump..... at least that's when I did.

  3. #3
    Moderator beerdart's Avatar
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    I run 82psi WOT on bosch 42's stock fuel pump.

  4. #4
    pass1's Avatar
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    WOW, so the stock pump an injectors can handle a really big charger.

    Could you guy's give me a rough idea on what base pressure I should start to set my rrfpr:
    Last season I just had the charger and 42's and my afr's were a little rich... was running 11.2/11.3 at WOT.
    The charger upgrade, intercooler and rrfpr are a winter project. Will also add a 4'' fizzle intake.
    Got a 215 motor with stock ECU, x-charger with RR ''A'' kit (11.5psi announced), 42# bosh, riva rrfpr, xs-intercooler.

  5. #5
    Moderator beerdart's Avatar
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    60 ish.
    Quote Originally Posted by pass1 View Post
    WOW, so the stock pump an injectors can handle a really big charger.

    Could you guy's give me a rough idea on what base pressure I should start to set my rrfpr:
    Got a 215 motor with stock ECU, x-charger with RR ''A'' kit (11.5psi announced), 42# bosh, riva rrfpr, xs-intercooler.

  6. #6
    Quote Originally Posted by beerdart View Post
    I run 82psi WOT on bosch 42's stock fuel pump.
    Can you see the fuel pressure gauge at wot?

  7. #7
    Moderator beerdart's Avatar
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    Yes
    Quote Originally Posted by RXP6 View Post
    Can you see the fuel pressure gauge at wot?

  8. #8
    pass1's Avatar
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    I got a afr auge so fuel pressure at WOT is not that important.
    To see the fuel gauge I would have to ride without the seat on, not really the most comfortableat 70+ mph.

    Thanks Beerdart, will try at 60psi base pressure and go from there. I guess if I'm too rich (still low 11's like I was) I just have to drop base pressure a bit and retry till I get the ideal 11.9 afr.

  9. #9
    You can run that charger wo that rrfpr. I have run that combination 80 hour (stock ECU 215,x-charger les cooke A-kit, xs intercooler,42# inj, 15/21 ) on a RXT 215 )and have no problems.

  10. #10
    monaroman76's Avatar
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    Quote Originally Posted by mmvane2 View Post
    You can run that charger wo that rrfpr. I have run that combination 80 hour (stock ECU 215,x-charger les cooke A-kit, xs intercooler,42# inj, 15/21 ) on a RXT 215 )and have no problems.
    Hmmmmmm

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