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Injectors - dead time - voltage - pressure

Discussion in 'A3/S3 Forum (8L Chassis)' started by superkarl, Mar 19, 2013.

  1. superkarl
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    superkarl MAN OF STEEL

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    [Mar 19, 2013]
    just trying to interpret this data:
    https://docs.google.com/file/d/0B-z7ncRSik0peld5clJIZ0pTZ3c/edit?usp=sharing
    supplied by USRT.
    i like to understand things you see.

    now from what i know injectors have a 12v feed. so why the data for other voltages?
    the differences in dead times seems quite big between say 12v and 14v.
    but they dont alter a great deal with differences in fuel pressure (3bar - 7bar)
    if you run at standard 3bar, with 12v feed, the dead time will be 1.12ms. rising to 1.17 if running say 2bar boost.

    just trying to understand this a whole lot more basically, i like to be a nerd. If someone has good knowledge of this sort of thing please share.
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  3. beachbuggy
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    beachbuggy Well-Known Member

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    [Mar 19, 2013]
    The graph is used when tuning TVUB map which is the voltage compensation map. Injectors don't get a pure 12 volts all the time and this map is used to compensate for that.
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  4. superkarl
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    superkarl MAN OF STEEL

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    [Mar 19, 2013]
    do they use it to try and keep the dead time the same all the time?
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  5. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Mar 19, 2013]
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  6. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Mar 19, 2013]
    13.8v is more normal running voltage... cranking will be less of course..
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