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Thread: EFI injectors, what pressure?

  1. 17th December 2009, 08:12 AM #1
    discowhite's Avatar
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    EFI injectors, what pressure?

    what pressure can the standard 3.5/3.9 injectors handle?

    my pressure reg is weak and only giving 28pis at idle, should be 30-40psi and not blead back.
    ive attached an aftermarket rising rate FPR and have it at 60psi drives bloody great no hesitation anywhere, but i think some of the injectors may be leaking causing an erratic idle.

    cheers phil
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  2. 17th December 2009, 04:36 PM #2
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    usually the max pressure for generic regualtors is 45-50psi. (which is about 60-65 psi absolute)
    Dave

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  3. 17th December 2009, 06:02 PM #3
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    thanks dave, ive found a couppla sites saying 55psi max. im going to wind them back abit closer to 50psi.

    cheers phil
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  4. 17th December 2009, 06:38 PM #4
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    I run my bosch injectors at 80psi......they love it
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  5. 17th December 2009, 07:21 PM #5
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    Stupidly high performance injectors will clear 200psig.

    but at that pressure for a petrol injector splitting the hairs over psia and psig is a bit pedantic.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
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  6. 17th December 2009, 11:51 PM #6
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    The stock Lucas injectors are rubbish.

    Toss em out and get the Bosch yellow Generation 3 units from the Mustangs etc.

    I did a post with Mike90RR on this and all the info is in the post below.

    RRC 90 EFI testing

    cheers

    andrew



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  7. 18th December 2009, 09:01 AM #7
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    I fitted a set of those and didn't really notice any difference...
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  8. 18th December 2009, 02:52 PM #8
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    Quote Originally Posted by BigJon View Post
    I fitted a set of those and didn't really notice any difference...
    Really???? I got better starting, better idle, smoother power, a fraction less pedal requirement, a definite improvement in low down torque and now all my plugs are identical colour and not sooty.
    It's the spray pattern that makes the difference with a much finer mist opposed to the Lucas unit.
    The intake walls of my heads showed quite clearly where the Lucas ones were washing the sides. Since changing, the washed areas are now darkening up again from PCV mists again.

    Cheers

    Andrew
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  9. 18th December 2009, 06:01 PM #9
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    Where would one be able to purchase those Yellow Gen III Bosch injectors from ? Can someone post up a site?
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  10. 18th December 2009, 10:20 PM #10
    mike 90 RR Guest
    Quote Originally Posted by Disco_owner View Post
    Where would one be able to purchase those Yellow Gen III Bosch injectors from ? Can someone post up a site?
    Just for you mate ....
    MUSTANG 5.0 HO 4.6 V8 T-BIRD 19lb 19 lb FUEL INJECTORS:eBay Motors (item 290381634963 end time Dec-21-09 15:05:24 PST)
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