MS3 users 3.3 BAR map settings?
Thread Starter
Joined: May 2011
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From: Wichita, KS
MS3 users 3.3 BAR map settings? What is everyone using here? It says the offsets are supposed to be 33 and 333? Yet when I enter these values and check them against my calibrated MAP sensor ( PLX boost gauge). The results aren’t even close. Using shop air and a regulator I just couldn’t get this sensor to read correctly throughout the range. I run around 20-25lbs of boost mostly so form 15-25lbs Using -30 and 357 was pretty spot on and only a pound or so off at lower boost ranges. I don’t have a way to check the vacuum, but I assume it isn’t pretty. Whats the deal with these sensors? Did GM just tune around their crappyness? Or am I missing something?
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From: Norn Iron
Absolutely ALWAYS such test sensors ! It's a first basic setup step when installing or changing such things.
And 3.3bar sensor is mentioned here and GM ?
GM never made a 3.3 bar sensor I am aware of ? And is it an actual OEM GM part you're using ?
And 3.3bar sensor is mentioned here and GM ?
GM never made a 3.3 bar sensor I am aware of ? And is it an actual OEM GM part you're using ?
Thread Starter
Joined: May 2011
Posts: 8,485
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From: Wichita, KS
Yup GM part. I went with it because it snapped right into the truck intake for a quick easy install.
AC Delco P/N 213-4658, GM P/N 12623671 formerly GM P/N 12215049 and 16235939. 3.3 BAR sensor
Old PN data sheet
http://www.powerandsignal.com/docs/P...s/12215049.pdf
Link to new part
http://www.gmpartsdirect.com/oe-gm/12623671
Been running one on my RX7 for a while now, but it was always off a bit. (i just tuned around it)
Grabbed another for the mustang I’m putting together and wanted to get it “right”. Or at least as close as possible. It’s almost like it isn’t linear.
I had a vendor selling a knock off of it tell me this.
Scalar: 617
Offset: 11
But I’m not sure how that translates into the MS3 parameters. I believe that’s for factory ECU inputs.
AC Delco P/N 213-4658, GM P/N 12623671 formerly GM P/N 12215049 and 16235939. 3.3 BAR sensor
Old PN data sheet
http://www.powerandsignal.com/docs/P...s/12215049.pdf
Link to new part
http://www.gmpartsdirect.com/oe-gm/12623671
Been running one on my RX7 for a while now, but it was always off a bit. (i just tuned around it)
Grabbed another for the mustang I’m putting together and wanted to get it “right”. Or at least as close as possible. It’s almost like it isn’t linear.
I had a vendor selling a knock off of it tell me this.
Scalar: 617
Offset: 11
But I’m not sure how that translates into the MS3 parameters. I believe that’s for factory ECU inputs.
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From: Norn Iron
At the end of the day, as long as it is consistent, that is what matters.
You will calibrate your setup to suit. That's how it works for any sensor. Dont assume, dont use others numbers etc etc.
You will calibrate your setup to suit. That's how it works for any sensor. Dont assume, dont use others numbers etc etc.
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From: Norn Iron
Simple answer is test it and see.
Although worth noting that calibrating at 0v and 5v is often silly, as a lot of pressure sensors will never actually ever get to 0v or 5v.
Most will flatline a little before either end ( some a lot, quite a few will only read between 0.5v and 4.5v ) ), so you'd need to plot the line of voltage vs pressure and from that find the hypothetical 0v and 5v readings.
Although worth noting that calibrating at 0v and 5v is often silly, as a lot of pressure sensors will never actually ever get to 0v or 5v.
Most will flatline a little before either end ( some a lot, quite a few will only read between 0.5v and 4.5v ) ), so you'd need to plot the line of voltage vs pressure and from that find the hypothetical 0v and 5v readings.
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From: Norn Iron
Accuracy only depends on what you are calibrating or comparing it to.
if you've calibrated it correctly....then it can only be accurate, unless the sensor itself does not behave in a consistent and repeatable manner.
TECH Addict
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From: PDX-OR-USA
I've been eyeballing this one,,
http://www.delphi.com/manufacturers/...oline/map-mat/
Its kinda cool, since its both a MAP and a IAT and SMALL.
http://www.delphi.com/manufacturers/...oline/map-mat/
Its kinda cool, since its both a MAP and a IAT and SMALL.
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From: Norn Iron
Again as long as you can calibrate your system to use it, shouldnt be a problem
and as the post also indicates, they're only showing a linear voltage between 0.5v and 4.5v
So for any system asking for 0v and 5v scalings...you'd need to create hypothetical scalings for this. It's a silly fixed range to be asking for when so many sensors do not read to the voltage extremes.
and as the post also indicates, they're only showing a linear voltage between 0.5v and 4.5v
So for any system asking for 0v and 5v scalings...you'd need to create hypothetical scalings for this. It's a silly fixed range to be asking for when so many sensors do not read to the voltage extremes.
TECH Regular
Joined: Sep 2011
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From: Washington
A quick google search shows map sensors being scaled from 0 to 5v. But I agree, motor pressure sensors are scaled in .5-4.5 range and megasquirts gerneric sensor table uses 0-5, there is a formula for figuring the data, I'm logging 100 and 300psi sensors
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From: Norn Iron
Either way...when it is critical always test, never assume.
According to these post the duramax 3.3 bar map won't read below 40 kpa
https://ls1tech.com/forums/forced-in...ap-sensor.html
https://ls1tech.com/forums/forced-in...ap-sensor.html
https://ls1tech.com/forums/forced-in...ap-sensor.html
https://ls1tech.com/forums/forced-in...ap-sensor.html
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From: Norn Iron
Not really a huge issue in most cases.
Although a stock engine might idle close to that. Only other times it'd be as low are on the overrun.
But again....dont take others word, test and calibrate the sensor to be sure.
Although a stock engine might idle close to that. Only other times it'd be as low are on the overrun.
But again....dont take others word, test and calibrate the sensor to be sure.