1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Oem Map Sensor And Boost

Discussion in 'Turbo Information' started by pissedoffsol, Jun 9, 2003.

  1. pissedoffsol

    pissedoffsol RETIRED

    Likes Received:
    Sep 28, 2002
    Retirement Home
    on a stock map sensor, the amount of boost you can run is limited due to the fact that it doesn't know what to do with it, and throws a code.

    OBD0 .65 KG/cm2= 9.24 PSI
    OBD1-2 .75 kg/cm2 = 10.66 PSI

    if you want more than that, you need to run a GM 3-bar map sensor (common) or others like the gm 2.5bar, the aem 3.5, and there are other crazy ones out there that are like 5 or 6 bar.

    Remember, your tuning software must have the proper voltage assigned to the sensor. Both stock and the 6 bar maps operate on a fixed voltage range (0-5volts), but each psi moves a different amount of voltage over. Therefore it is imperitive to be using the right map sensor's output voltage range when you're tuning, and thus in your software.

    A linear example (not accurate numbers, just for display purposes)

    0----1----3-----5------7------9-----11 psi (oem)
    0-1--3--5--7--9---13--15--19---21---27 psi (gm 3bar)
    0-5--10--18--23--27--32--38--41--48-56 psi (5bar)
    keep in mind, 1 bar is alread used by the atmospheric pressure, so it leaves you about 2 bars give or take your elevation left for boost... about 26-28 psi (depending on elevation) on a GM 3-bar.
    Last edited: Jul 10, 2006

Share This Page