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injector on time?

Discussion in 'VCDS (formerly VAG-COM) forum' started by dultanur, Oct 27, 2006.

  1. dultanur
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    dultanur all promises, no action :)

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    [Oct 27, 2006]
    hi guys!

    in vag-com measuring block 002, it says injector on time in ms.how can i know if my injectors have reached their limits, unable to supply more fuel? is there a specific maximum for the "on time"?

    thanks!
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  3. Uwe@Ross-Tech
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    Uwe@Ross-Tech Member

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    [Oct 30, 2006]
    Yep. They're maxed out at around a 90% duty cycle. How many millseconds are 90% duty cycle? This obviously depends on RPM.

    Pick an RPM. Let's use 6000. Since there's 60 seconds in a minute, that's 100 RPS. So a revolution takes 10 ms. But you have a 4-stroke engine, meaning a complete cycle is 2 revolutions, so double that, a cycle is 20 ms. So your injectors are maxed out at around 19 ms.

    Generalizing this forumula for an arbitrary RPM is an exercise left to the student...:)

    -Uwe-
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  4. dultanur
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    dultanur all promises, no action :)

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    [Oct 31, 2006]
    wow, thats pretty complex. i'll get to work right away!

    thanks for the explanation :D
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