MAP sensor pressure ranges

Discussion in 'Big Turbo Discussion' started by rsrich, Mar 25, 2010.

  1. rsrich

    rsrich Newbie

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    Can someone positively confirm the pressure range of a couple of MAP sensors please??

    038 906 051 C (Bosch ref. 0281 002 401)
    038 906 051 D (Bosch ref. 0261 230 073)

    My information says that the "C" suffix is 300KPa absolute, and "D" suffix is 400KPa absolute (ie up to 2-bar and 3-bar boost respectively) - can someone catagorically cofirm?

    Strange thing is I have a "D" suffix part (genuine VAG part with correct labelling etc) but it only has a 250KPa range - outputs 4.65V @ 250KPa as per bosch spec for 250KPA sensor)

    MAny thanks for any assistance :D
     
  2. Damoegan

    Damoegan Sir Bob,a geordy legend..

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    I think that the max reading is 2.5bar....
     
  3. pj1985

    pj1985 1.8T Power

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    A 2.5 bar map sensor and a 3 bar map sensor will read upto 2.5 bar and 3 bar, its just a pressure sensor. Dont know if there is a difference between me7 and me7.5 and whether the range is limited in it. Some mappers can map with 3 bar but it needs to be adjusted in the map as if you just put in a 3 bar map sensor it confuses the ecu.
     
  4. rsrich

    rsrich Newbie

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    all I need to know is what range the two part numbers listed are intended to cover. Mapping isn't an issue as we have aftermarket management anyway so I can scale accordingly, but I'm up against the end of a 2.5bar sensor at the moment at 1.5bar boost and need some headroom. I can use either 3-bar or 4-bar sensors but need to be sure of which part number will do what I need, as the "D" suffix part I have has an output characteristic and range exactly as a 2.5bar one, although everyone who claims to know says it should be 4-bar. No point getting another if that is not true..
    Waste of time asking VAG as they only know what part number fits what vehicle model and no more. I can't find definitive Bosch data for those two specific parts, that would be the ideal solution.
     
  5. DPJ

    DPJ ...........

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    Some of the diesel map sensors read higher. But as said, mapping needs adjusting to suit the scaled readings.
     
  6. ibizacupra

    ibizacupra Jack-RIP my little Friend

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    as Rich said he's mapping the sensor to the ecu (emerald)
    Whats the part number on the diesel MAP sensor, as I thought this was a suffix D unit...

    If anyones got this part number then this should be the 3bar sensor (abs)
     
  7. rsrich

    rsrich Newbie

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    Yes both those part numbers are fitted to various diesel models, and I "believe" the "C" suffix part is 3-bar but no-one I've found yet has definitive data to support that.
    Mapping is not an issue, I can scale for whichever part I use accordingly.
     
  8. rsrich

    rsrich Newbie

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    the confusing thing that's putting me off in all this, is that I have what is generally accepted to be a 4-bar sensor (038 906 051 D) but which actually behaves as a 2.5Bar one.
    So I want/need hard and fast factual data, because hearsay and "general consensus) hasn't worked out so far...
    Here's an example - http://www.euromotortech.com/index.php?main_page=index&cPath=6_235 - that says it pretty clearly, but my "D" part isn't 4-bar... :confused:
     
  9. DPJ

    DPJ ...........

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    You mean it returns exactly the same voltage for a given pressure as a stock 1.8T sensor?
     
  10. rsrich

    rsrich Newbie

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    Yep :D what I measured:

    ~20KPa = 0.4V
    100KPa (atmospheric) = 1.85V
    250KPa = 4.65V
     
  11. IbizaAlex

    IbizaAlex AKS tuning

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    I have a 3 bar map sensor on my car. I can check the part number at the weekend for you?
     
  12. rsrich

    rsrich Newbie

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    yeah that would be good, cheers [B)]
     
  13. rsrich

    rsrich Newbie

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    ah well, I have confirmation from Bosch regarding these two sensors... oh the joys of misinformation on the Internet [:@]

    The "C" suffix is 3-bar and the "D" suffix is in fact 2.5Bar NOT 4Bar
    I have seen at least 2 companies advertising the 0261 230 073 sensor as 4-bar.. :think:
     
  14. ibizacupra

    ibizacupra Jack-RIP my little Friend

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    thanks for confirming Rich..
    :thumbup:
     

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