Interesting, mappable, K-Jet system

Discussion in 'K-Jetronic OEM injection' started by seanr68, Dec 21, 2011.

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  1. rubjonny

    rubjonny Administrator Staff Member Admin

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    its a bit wierd! the fuel injector goes inline with the WUR hoses, what it does is allow the ecu to regulate the control pressure, and therefore the amount of fuel that is injected by the fuel injectors. it doesnt spray in any extra fuel itself :)
     
    rubjonny, Dec 22, 2011
    #21
  2. mitlom

    mitlom Forum Member

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    [:s] where does the fuel go it delivers then? Or am I being a dumbass? [:$]
     
    mitlom, Dec 22, 2011
    #22
  3. FTHAIMIKE

    fthaimike Forum Addict

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    back through the main line up to the airbox/k-jet that would normaly come from the wur

    i think like the kstar but that had a seperate injector between the wur that was controlled but this just does it all via it's own instead of having your usual factory wur.
     
    Last edited: Dec 22, 2011
    fthaimike, Dec 22, 2011
    #23
  4. rubjonny

    rubjonny Administrator Staff Member Admin

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    ok I'll take a step backwards :thumbup:

    you know the way the k-jet system delivers fuel is via the air being sucked in by the engine lifting up the metering head air flap right? the amount the air flap moves for any given volume of air is determined by the control pressure, which is basically a reservoir of fuel above the metering pin. the higher the pressure, the more force is needed to move the flap. so contrary to what you might think, lower control pressure means more fuel, because at a lower pressure the air flap can move further upwards for the same volume of air being sucked in.

    all the k-star+fuel does is allow you to map this control pressure with the ecu, therefore you can totally remap the fuel :thumbup:
     
    rubjonny, Dec 22, 2011
    #24
  5. JAMESA

    jamesa Forum Junkie

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    My reference to the fifth injector was aimed at that supplied as part of the KS system and not the Cold Start injector ... honest :)
     
    jamesa, Dec 22, 2011
    #25
  6. mitlom

    mitlom Forum Member

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    Yep I know all that :lol:....maybe I need to re-word my question......how does the KStar reduce the control pressure via this additional injector? Or is it not an injector in the true sense of the word?
     
    mitlom, Dec 22, 2011
    #26
  7. DANSTER

    danster Forum Addict

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    Thread glitch, not opening 2nd page. Issue reported.
     
    danster, Dec 22, 2011
    #27
  8. mitlom

    mitlom Forum Member

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    Huh? It's been fine for me Danny [:s]
     
    mitlom, Dec 22, 2011
    #28
  9. JAMESA

    jamesa Forum Junkie

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    :thumbup:

    The injector is just a control device, it reduces the control pressure by opening and allowing the fuel to return to the tank (at the primary control pressure regulator return in the metering head / air flow unit)
     
    jamesa, Dec 22, 2011
    #29
  10. JAMESA

    jamesa Forum Junkie

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    I did lose it for a while ....
     
    jamesa, Dec 22, 2011
    #30
  11. JAMESA

    jamesa Forum Junkie

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    Crikey ... all this old skool chat will have me back in the garage with the Mk1 if I`m not careful :o:lol:
     
    jamesa, Dec 22, 2011
    #31
  12. mitlom

    mitlom Forum Member

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    :thumbup: got it ;)
     
    mitlom, Dec 22, 2011
    #32
  13. mitlom

    mitlom Forum Member

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    Weird [:s]
     
    mitlom, Dec 22, 2011
    #33
  14. DANSTER

    danster Forum Addict

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    Sig worthy. :lol:

    Have you gone back to 8v now? ;)
     
    danster, Dec 22, 2011
    #34
  15. JAMESA

    jamesa Forum Junkie

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    Aye .. I could see another username as having posted but when opening the thread there was nothing there .... lost it & weird are not too unfamiliar to me though :lol:
     
    Last edited: Dec 22, 2011
    jamesa, Dec 22, 2011
    #35
  16. DANSTER

    danster Forum Addict

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    It's all RJ's fault. [:x]
    Problem identified, thread went to lockdown, I had put megasquirt in the swear filter in this K-Jet section. :lol:
     
    danster, Dec 22, 2011
    #36
  17. mitlom

    mitlom Forum Member

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    :lol::lol::lol: :clap:
     
    mitlom, Dec 22, 2011
    #37
  18. JAMESA

    jamesa Forum Junkie

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    Not quite ... do have one here though, daughter`s MkIV AZJ ... really is `touchy` on the emissions settings [:x]
     
    jamesa, Dec 22, 2011
    #38
  19. SEANR68

    seanr68 Forum Member

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    Well, after all that, i wouldn't be able to use this anyway. My rocco's wur doesn't have a vacuum take off. MS looks like the way forward.
     
    seanr68, Dec 22, 2011
    #39
  20. JAMESA

    jamesa Forum Junkie

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    Why not, the standard UTCIS unit does not use a vacuum connection ...
     
    Last edited: Dec 22, 2011
    jamesa, Dec 22, 2011
    #40
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