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  1. #1
    Chaqui_74's Avatar
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    Question Question on 2 bar or 3 bad map sensor?

    I have a 21GP SVHO with a stage3 tune. My question is Iím running a 2 bar map sensor, should or do I need to go with a 3 bar?

  2. #2
    Click avatar for tech links/info K447's Avatar
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    The tune should specify which sensor range the tune requires.

  3. #3
    Chaqui_74's Avatar
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    This is what has me confused. I’m tuning a ET20 wheel.

    “Our 3 Bar MAP Sensor Kit is essential for accurate engine management with boost applications over 14.7psi. High quality 3 Bar MAP Sensor will measure up to 29.7psi, where the OEM 2 Bar MAP Sensor will only measure up to 14.7psi.”




    Quote Originally Posted by K447 View Post
    The tune should specify which sensor range the tune requires.

  4. #4

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    The psi numbers are gage values, not absolute. So a 2 bar sensor reads one bar above atmospheric pressure or 14.7 psi. 3 bar is around 29.4 psi.

  5. #5
    I had the same issue after buying the map sensor. I had an email from Jesus @ Riva saying it wasnít needed on my 2018 gp1800
    Last edited by daz_ni; 09-20-2021 at 05:48 PM.

  6. #6
    On some of the riva tunes they manage to use the 2 bar sensor with bigger wheels making well over 14.7 psi. So if Jesus says 2 bar then use a 2 bar. If he says 3 bar then use a 3 bar.

  7. #7
    mittens's Avatar
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    14.7 is Atmospheric pressure. so a 2 bar (factory sensor) is good for 2X that... which is 29.4 PSI total pressure. 29.4psi - the atmospheric pressure = its onl good till 14.7 lbs of boost.

    Tuners can get away with a 2 bar sensor on the Skis gear driven super charger because there is no variable with boost vs RPM. so knowing what wheel, and what RPM, will tell them basically what boost level the motor will be at.


    A 3 Bar map allows the ECU to see 3bars, or 44.1psi - the atmospheric pressure (14.7) = 29.4 lbs of boost. This will allow the tuner to not guess/ (even is educated, non variable guess). write the tune for it exact and the tune should be spot on with what ever elevation or changes


  8. #8
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by Chaqui_74 View Post
    I have a 21GP SVHO with a stage3 tune. My question is I’m running a 2 bar map sensor, should or do I need to go with a 3 bar?
    Stage 3 MaptunerX tune uses the stock map sensor.
    You need a special tune to be able to run a 3 bar.

  9. #9
    I’ve noticed that there are now some tunes in the maptunerx library which are for the 3 bar map sensor

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