anybody have the GM 2 bar linear and offset values for MAP 12580698

[Dozer]

Might want to verify with the stock 1bar sensor first with the stock settings. Usually atmospheric is about 101 Kpa unless you are at high altitude then it's about 87 Kpa.

86.47kpa here and a DA of 9000 in the summer

[RWTD]

Wierd but the Cadillac STS-V uses the same sensor and the linear value is different.

Linear 200 Kpa
Offset 8 Kpa

EC, is this what you'd use if you were using this sensor? Seems that going by GM's #s can't really be all too bad, 'eh?

[EC_Tune]

I think that is correct.

[5_Liter_Eater]

FYI

I had a small calculation errorwhen I had it as 208/8. The linear should be how many kPa there are within 5V, not at 5V. Since 0V is 8 kPa and 5V is 208 kPa that is 200 (208-8). So it should be as Doug said, 200/8. I did have to edit my offest by adding .33 to it in order for it to match my baro sensor so I ended up with 200/8.33.

[NTIMID8]

FYI

I had a small calculation errorwhen I had it as 208/8. The linear should be how many kPa there are within 5V, not at 5V. Since 0V is 8 kPa and 5V is 208 kPa that is 200 (208-8). So it should be as Doug said, 200/8. I did have to edit my offest by adding .33 to it in order for it to match my baro sensor so I ended up with 200/8.33.

Um, what baro sensor

[5_Liter_Eater]

Whatever baro sensor is feeding data to the baro sensor PID.

[NTIMID8]

Whatever baro sensor is feeding data to the baro sensor PID.

That "sensor" Would be the map sensor .

[5_Liter_Eater]

If so then why do changes to the MAP linear and offset not seem to affect the baro reading?

[carlrx7]

say what???? i just got 12615136 which is the replacement for 12580698.

i guess im gonna check what it is with the stock 1 bar sensor, swap in this one. put in the new offset and linear settings and check it with key on, engine off.

-carl

[TXZ0603]

Talk about back from the dead...lol

[5_Liter_Eater]

say what???? i just got 12615136 which is the replacement for 12580698.

i guess im gonna check what it is with the stock 1 bar sensor, swap in this one. put in the new offset and linear settings and check it with key on, engine off.

-carl

Thats really the best way to find the offset (assuming the stock sensor is accurate). Use the 200 linear though.

[carlrx7]

edit:

lol, i answered myself! haha

200 and 8.33 worked great

[ericwilloughby]

Not for me. It works great when your checking for o psi, 100 kpa. Cobalt baro sensor in my ls2 doesn't read accurately. Its off by %20 at its limits. That's with linear set at 200 offset 8. It gets close to right with linear set at 170 and offset 18. But of course it'll max out at 1.7 bar. Anyone else have this issue?

Check your sensor at 20", should be 33 kpa, and 10 psi boost, should be 166 kpa. Let me know what you get.

[scdyne]

look at the spec sheet it shows that the sensor is more accurate from 40 to 160 and goes south outside of these limits real fast. Also when you add the temp adjust outside of 10-85 it goes out also.
Combined, if you have high charge temps and go beyond 160kPa then you will have an increased error.

Use the calibration data sheet to set your slope and offset and tune more conservative at the limits or get a better map sensor.

[ericwilloughby]

Got a part # for a better MAP sensor that fits?