505 GTI Bosch L Jetronic Injection
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  1. #1
    Fellow Frogger!
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    505 GTI Bosch L Jetronic Injection

    A couple of questions concerning the ZDJL engine on the P505 GTI.

    The Bosch supplementary notes for the injection system state that the ECU controls the injectors for "simultaneous operation".

    Does this mean that, as with the K Bosch (mechanical) type, the fuel injection process is continuous? Or, is each injector triggered with an electronic pulse to coincide with the induction phase of each cylinder.

    If continuous, then it would not matter which injector connector from the harness was connected to the injectors.

    If the latter, then like distributor leads, a correct order would need to be followed. In other words, the injection process is sequential rather than simultaneous or continuous.

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    Any thoughts re this?

    Cheers,
    Kim.

  2. #2
    Guru davemcbean's Avatar
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    Kim,

    The GTi injection is not continuous, but it may not be sequential either. The solenoids are "pulsed" by the computer, although the information I have does not say whether they are pulsed in unison, in pairs, or sequentially.

    The "simlutaneous operation" statement suggest that they are pulsed in unison, but I wouldn't take this for granted.

    Dave
    NZ Fleet
    1976 504 Ti
    1984 205 GT twin carb
    1991 205 SI 1.6GTI motor
    1994 106 Xsi
    1996 Mondeo V6
    Aus Fleet
    1955 203C
    1997 Civic Cxi (great allrounder- revy, flexible, nimble, comfortable , economical, simple and durable )

  3. #3
    Fellow Frogger!
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    Kim,

    What they r trying to say is the injectors work in a batch fire mode.(Computer pulses all injectors simultaneusly)
    That would mean u can jumble up the injector harness and it would be ok.
    But you will find that the correct harness is the most suitable (Length wise)
    Sequential injection is only found in more complex management systems (They require you to treat the injector harness like ignition leads)
    The sequential systems don't have any power advantage but they were invented to pass tight smog and immition regulations.

    Murat

  4. #4
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    Yep. The injectors all open at the same time. Their are 2 injections per 4 stroke cycle (one per crank revolution). The opening timing is therefore timed in with the crank. The fuel injection rate is determined wholly by pulse time (ie. time the injectors are open) as they have constant lift and balanced pressure differential between the fuel rail and the manifold absolute pressure. At high revs (say 6000), the injectors barely have time to close.

    Unusually, the injectors are closed when power is applied (ie. ignition is on) but open when there is zero volts at the injector - the ECU grounds the circuit for the determined pulse time. Which is the opposite of most solenoids.

    Cheers

    Stuey


    2003 PEUGEOT 206 GTi

  5. #5
    Fellow Frogger!
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    Thanks to all who replied on this one.

    The explanation of "simultaneous operation" makes good sense. From my comparison with the operation of the K with the L type, even though both are "simultaneous", in fact the K is more continuous rather than being pulsed. This seems to make the L type more smooth operation at the lower RPM's.

    Which leads me to another topic post.

    Regards,
    Kim.

  6. #6
    Guru davemcbean's Avatar
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    Kim,

    Yeah the K-jetronic is completely continuous.

    Dave
    NZ Fleet
    1976 504 Ti
    1984 205 GT twin carb
    1991 205 SI 1.6GTI motor
    1994 106 Xsi
    1996 Mondeo V6
    Aus Fleet
    1955 203C
    1997 Civic Cxi (great allrounder- revy, flexible, nimble, comfortable , economical, simple and durable )

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