XU9JA 1.9 Injection
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  1. #1
    1000+ Posts PugMonkey's Avatar
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    Default XU9JA 1.9 Injection

    Can someone tell me if the injection on a standard Bosch system for this engine is sequential fire or batch fire please.

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    Thanks.
    Last edited by PugMonkey; 2nd March 2015 at 05:48 PM.
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  2. #2
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    Just the basic L Jetronic batch fire.

    Quote Originally Posted by PugMonkey View Post
    Can someone tell me if the injection on a standard Bosch system for this engine is sequential fire or batch fire please.

    Thanks.

  3. #3
    1000+ Posts PeterT's Avatar
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    It's not batch either. It's multipoint. They all fire together.

    '92 205 Mi16
    '90 Mi16x4

  4. #4
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    I can't understand how the cylinders that are "out of phase" get the juice right if all injectors fire at the same time.

    Does this mean sequential injection is more precise?
    ....now watch a Peugeot turn into a corner!

  5. #5
    1000+ Posts PeterT's Avatar
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    Correct. In multipoint, the injectors fire twice per engine cycle, perhaps a maximum of 8ms each time. The start of injector period varies depending on where the distributor was when the engine was started. With sequential, the injection period is timed for each cylinder. For example, a single 16ms maximum pulse.

    '92 205 Mi16
    '90 Mi16x4

  6. #6
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    As far as power goes it makes virtually no difference, the fuel is hanging around for a very small period of time.


    If you mistime the drive belt in a Kugelfischer mechanical system (504Ti) you won't notice any difference, this is from Morassi and Williams, the experts in these systems.



    Quote Originally Posted by PugMonkey View Post
    I can't understand how the cylinders that are "out of phase" get the juice right if all injectors fire at the same time.

    Does this mean sequential injection is more precise?

  7. #7
    1000+ Posts jo proffi's Avatar
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    Quote Originally Posted by GRAHAM WALLIS View Post
    As far as power goes it makes virtually no difference, the fuel is hanging around for a very small period of time.


    If you mistime the drive belt in a Kugelfischer mechanical system (504Ti) you won't notice any difference, this is from Morassi and Williams, the experts in these systems.
    I can move my injection timing to anywhere in the cycle, but bugger if I can find a definitive sweet spot within that range.

    I can see a slight change on the o2 or the MAP, but it is subtle.

    Jo

  8. #8
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    A nice graphic from the Bosch literature.


    XU9JA 1.9 Injection-injection-types.png

    I believe also that although the wiring for the Motronic EFI DKZ (XU9JA/Z) might suggest that it uses grouped/banked firing as there are two Injector lines from the ECU, it is still simultaneous as per the Jetronic XU9s.

  9. #9
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    Thank you all.
    ....now watch a Peugeot turn into a corner!

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