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pissedoffsol · 06-09-2003, 01:16 AM

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)

Code:

0------------------------------------5v
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.

06-09-2003, 01:16 AM	#1
pissedoffsol RETIRED Join Date: Sep 2002 Location: Retirement Home Age: 29 Posts: 49,951 iTrader: 2 / 100% Ride: Electric Scooter Blog Entries: 1 Rep Power: 531	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) Code: 0------------------------------------5v 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 by pissedoffsol; 07-10-2006 at 11:21 AM.


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Oem Map Sensor And Boost