GM 12592525 3-Bar Map Sensor (ZR1 - LS9/LSA) Calibration

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pac1085
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GM 12592525 3-Bar Map Sensor (ZR1 - LS9/LSA) Calibration

Post by pac1085 »

Just curious if anyone has the calibration info for this Map sensor:

http://www.jdpmotorsports.com/genuine-g ... r-12592525

They list something in the description, but it's in GM ECU lingo.

Thanks!
Current:
1995 Firebird Formula 5.3 LM7 Engine / 4L80E with MS3/MS3X 1.3.2 and Microsquirt Transmission Controller

Past:
1997 Audi A4 2.0TQM
MS3/MS3X
Matt Cramer
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Re: GM 12592525 3-Bar Map Sensor (ZR1 - LS9/LSA) Calibration

Post by Matt Cramer »

First time I've seen a MAP sensor wearing both Bosch and AC-Delco markings! But it looks like it uses the standard GM 3 bar calibration.
Matt Cramer -1966 Dodge Dart slant six running on MS3X
MonzaRacer
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Re: GM 12592525 3-Bar Map Sensor (ZR1 - LS9/LSA) Calibration

Post by MonzaRacer »

The chart below describes the pressure-to-voltage relationship of the stock GM Turbo MAP sensor (2 bar):

Manifold Pressure
(relative sea level / absolute) 2 Bar
MAP Output
14.31psi / 29.01psi 4.90V
14.00psi / 28.70psi 4.84V
13.00psi / 27.70psi 4.67V
12.00psi / 26.70psi 4.50V
11.00psi / 25.70psi 4.33V
10.00psi / 24.70psi 4.16V
9.00psi / 23.70psi 3.99V
8.00psi / 22.70psi 3.82V
6.00psi / 20.70psi 3.47V
4.00psi / 18.70psi 3.13V
2.00psi / 16.70psi 2.79V
0.00psi / 14.70psi 2.45V
5.00inHg / 12.24psi 2.03V
10.00inHg / 9.78psi 1.61V
15.00inHg / 7.33psi 1.19V
20.00inHg / 4.87psi 0.77V
25.00inHg / 2.41psi 0.35V
29.10inHg / 0.40psi 0.02V

MAP sensor output based on altitude (Ignition "ON" and engine stopped)
Altitude Voltage Range
Meters Feet --------------
Below 305 Below 1000 3.8--5.5V
305--610 1000--2000 3.6--5.3V
610--914 2000-3000 3.5--5.1V
914--1219 3000--4000 3.3--5.0V
1219--1524 4000--5000 3.2--4.8V
1524--1829 5000--6000 3.0--4.6V
1829--2133 6000--7000 2.9--4.5V
2133--2438 7000--8000 2.8--4.3V
2438--2743 8000--9000 2.6--4.2V
2743--3048 9000-10000 2.5--4.0V
Low altitude = High Pressure = High Voltage


GM 1bar, 2bar, 3bar
1 PSI = 2.036" of Mercury (HG)
1" mercury = 0.4911541 PSI
Formula for the GM 3 Bar MAP sensor is (V*8.94)-14.53
I have no idea why it's 14.53 and not 14.696, [rounds up to 14.7] but it works out on GM's chart every time. It is possible that Detroit is slightly above sea level, and you can use 12.11 in the formula for 1 mile above sea level.


Well I was gonna upload a file that had information on GM map sensors, but in the INFINITE wisdom I cant upload it as it saved to my computer 3 yrs ago as an htm file. If anyone needs it let me know in an email at Monza283@gmail.com. OH wait supposedly there are issues with gmail account, can I list that here?
anyway, I hope what info I CAN share helps.
MonzaRacer
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Re: GM 12592525 3-Bar Map Sensor (ZR1 - LS9/LSA) Calibration

Post by MonzaRacer »

GM MAP sensor Identification

3 digit numbers for identification:
1 Bar: 039, 460, 883, 876, 153
2 Bar: 886, 012, 539, 609, 701
3 Bar: 749, 861



The logic module uses the manifold absolute pressure (MAP) sensor to determine the absolute pressure (not the relative to atmospheric pressure) of the air inside the intake manifold and the atmosphere (barometric pressure).
This information is used to determine the density of the air entering the combustion chamber (in conjunction with the IAT(Intake Air temperature) sensor), which is used when calculating the proper air/fuel mixture for the engine, especially at WOT since the system is not in closed-loop at this time.
It is also used to help adjust the IAC(Idle Air Control) motor during idle.
It uses a silicon wafer that is thinner in the center (0.001") than around the edges (0.045"), which causes it to act as a diaphram.
It is mounted with a perfect vacuum beneath the chip so that the air pressure from the other side flexes the chip.
This flexing causes a change in resistance and the circuitry inside the sensor converts this to a voltage ranging from 0.02V to 4.94V when the output is pulled up towards 5V by the ECM(Electronic control module).
1 Bar MAP sensors are used on NA(naturally asperated) vehicles.
2 Bar MAP Sensors are used on forced induction vehicles(Turbo & Supercharged). They can measure up to 2x the apmospheric pressure(29.4psi), so that means it can measure up to 14.7psi boost(the atmosphere is 14.7psi + 14.7psi from the turbo/supercharger).
3 Bar MAP sensors can measure up to 44.1psi, which translates to 29.7psi boost from a Turbo/supercharger.
They all share a common pinout, although the connector keying may be different:
Pin A -- Ground
Pin B -- Sensor output
Pin C -- +5 volts
Places to order MAP Sensors
You can order them direct from:
www.SummitRacing.com
PN# MSD-2313 3bar MAP
PN# MSD-2312 2bar MAP
PN# MSD-2311 1bar MAP

or

www.GMPartsDirect.com
PN# 12223861 3bar MAP
PN# 16040609 2bar MAP
PN# 16137039 1bar MAP
autoaddictions
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Re: GM 12592525 3-Bar Map Sensor (ZR1 - LS9/LSA) Calibration

Post by autoaddictions »

I was just revisiting this post. Im having the same issue. Im using this map sensor on my ms3 and its not scaling properly. Im using -11.2 AND 312.50. Its close but with engine off im seeing 105 kpa. This is throwing my hole tune off. At 8 psi the ecu thinks its at 12psi. Does anybody use this on a ls engine and have it scaling properly.
dll24
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Re: GM 12592525 3-Bar Map Sensor (ZR1 - LS9/LSA) Calibration

Post by dll24 »

I am having the same issue with my car it is reading 122kpa with the car shut off with that map sensor. I was wounded if anybody was able to resolve this issue with this map sensor thanks!
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