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Thread: Turbo Overboost

  1. 24th December 2013, 05:11 PM #1
    d2dave's Avatar
    d2dave
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    Turbo Overboost

    I am having a problem with turbo overboosting. I know the cause and the fix.

    My reason for this post is this.

    My Nanocom diagnosed overboost of the turbo.

    My question is this. Nanocom gets its info from the vehicles ECU.

    As the ECU is electronic and overboost is mechanical, how does the ECU obtain the information telling it that the turbo has overboosted?
    Dave.

    I was asked " Is it ignorance or apathy?" I replied "I don't know and I don't care."


    1983 RR gone (wish I kept it)
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  2. 24th December 2013, 06:24 PM #2
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    I'd say via the turbo boost modulator.
    Regards
    Robbo
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  3. 24th December 2013, 06:52 PM #3
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    The intake manifold.
    MAP (manifold absolute pressure/inlet temp sensor)
    Regards
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  4. 24th December 2013, 08:04 PM #4
    slug_burner
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    Quote Originally Posted by northiam View Post
    The intake manifold.
    MAP (manifold absolute pressure/inlet temp sensor)
    Regards
    What he said x2

    Everything that is reported/acted on by the ECU has to come from a sensor. There might be a thing or two that are derived from the readings on other sensors but generally there is a sensor if it needs monitoring.
    Quote Originally Posted by benji View Post
    ........

    Maybe we're expecting too much out of what really is a smallish motor allready pushing 2 tonnes. Just because it's a v8 doesn't mean it's powerfull.

    One answer REV IT BABY REV IT!!!
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  5. 24th December 2013, 08:51 PM #5
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    So where is the Map sensor?
    Dave.

    I was asked " Is it ignorance or apathy?" I replied "I don't know and I don't care."


    1983 RR gone (wish I kept it)
    1996 TDI ES.
    2003 TD5 HSE
    1987 Isuzu County
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  6. 24th December 2013, 09:34 PM #6
    slug_burner
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    Quote Originally Posted by Mr Whippy View Post
    So where is the Map sensor?
    here



    Quote Originally Posted by benji View Post
    ........

    Maybe we're expecting too much out of what really is a smallish motor allready pushing 2 tonnes. Just because it's a v8 doesn't mean it's powerfull.

    One answer REV IT BABY REV IT!!!
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  7. 25th December 2013, 03:09 PM #7
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    OffTrack
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    The ECU uses boost calculated as manifold absolute pressure (inlet manifold) less ambient air pressure (air box) and maxes out at 1.42 bar.

    You also get faults if the raw MAP reading exceeds 2.42 bar.

    Cheers
    Paul
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