ZR1 MAP scaling off?

[GrannySShifting]

Maxes out at 281.7 kPa with linear and offset values 312.5 and -11.25?

http://www.msextra.com/forums/viewto...p?f=71&t=53912

Are there varying ones?

[cobaltssoverbooster]

12592525 would be 312.5 and -11.25

its max range is 312.5-11.25 which is right around 300kpa.
i would check your koeoff reading and see if it lines up with a know barometric pressure reading for your area. if its off it may need the offset value adjusted to account for minor inconsistencies in electrical.

[GrannySShifting]

12592525 would be 312.5 and -11.25

its max range is 312.5-11.25 which is right around 300kpa.
i would check your koeoff reading and see if it lines up with a know barometric pressure reading for your area. if its off it may need the offset value adjusted to account for minor inconsistencies in electrical.

it does. But with wastegate shut MAP reads 281.7 in an unatural dead flat line like its maxxed out?

[cobaltssoverbooster]

well if the harness voltages and grounds are clean then i would perform a signal vs pressure analysis but its not something people want to do usually. i use pressure in a test pipe and use the oem harness koeoff to read signal voltage in hpt and mark pressures in psi using a gauge in the same pressure test vessel.
i would post a picture of my tester but i cant find it. kinda sucks cause i need to verify the same sensor calibration for my stand alone.

rarely the sensors are bad but i would assume in this case that the calibration is out before i went throwing it away for warranty.

[Frost]

Maxes out at 281.7 kPa with linear and offset values 312.5 and -11.25?

http://www.msextra.com/forums/viewto...p?f=71&t=53912

Are there varying ones?

They run out earlier than spec... the last F1x car that I had would peg at 255 kPa. Actually looking at older logs, I've seen that sensor peg at 255 kPa on several cars. Not sure why it's different than what you see, using the same offset and linear val... and I have never seen the discrepancies mentioned in that link. They always read right at key-on and back.

[tommytuner]

Early E38's flat line at 255, like frost said. It's not the sensor's fault tho. After upgrading to a holley dominator (and using the exact same sensor) it ran out at 281kpa.

[GrannySShifting]

Early E38's flat line at 255, like frost said. It's not the sensor's fault tho. After upgrading to a holley dominator (and using the exact same sensor) it ran out at 281kpa.

this is with a blue/green PCM

So youve seen sensor limit in this same spot?

[RonSSnova]

Old post. But we have run into this as well. Flat lines at approx 285 kpa.
P01, 3 bar tune, correct linear and offset.
Not good when my customer decided to run 25 psi then hit the scramble button.

[GrannySShifting]

So we are saying some ZR1 MAP sensors max out at 281-285 kPa and some can actually read 3 bar 300+ kPa?

[RonSSnova]

Don?t know about some Granny. It?s a GM part.
I plan to test it with either my Mighty Vac or regulated air when he gets back from Guard training.
I?m wondering if this is why Holley calls it a 2.5 bar map?

[RonSSnova]

Can?t edit here. Thought I?d add. Reviewing his logs, I noted it went lean his last pass. But showed 284 kpa. However, his fuel pressure had increased 32 psi. It?s always dead on 1 for 1 with boost.