Could this be used as a MAP sensor?

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pac1085
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Could this be used as a MAP sensor?

Post by pac1085 »

I am trying to keep my install as clean as possible, and am looking for a 1/4 npt map sensor.

Does anyone know if this would work?

http://www.digikey.com/product-detail/e ... ND/3945779

It says it is 50 psi capable, but doesn't say anything about vacuum. From what I understand, as long as its an absolute pressure sensor, not gauge, it should read vacuum, right?


Thanks!
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racingmini_mtl
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Re: Could this be used as a MAP sensor?

Post by racingmini_mtl »

That should work. And perfect vacuum is 0 psi absolute so as long as you use an absolute pressure sensor, you'll get the correct data for MAP. Remember that 50 psi absolute means that it will read up to about 34.3 psi of boost (50 minus the 14.7psi of atmospheric pressure).

You will need to use a custom calibration curve.

Jean
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pac1085
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Re: Could this be used as a MAP sensor?

Post by pac1085 »

I assume this guy would work too?


http://sensing.honeywell.com/product%20 ... _id=145707

Can anyone help me with the calibration data? I'm not quite sure I fully understand how to get the data needed for MS from the data sheet.

it says ratiometric 5v. 0.5 10% vs to 4.5 90% vs output

would that be
0v = -86 kpa
5v = 775 kpa ? I'm not sure I understand the 10% Vs to 90 % Vs part (sorry, not an electrical engineer)
Last edited by pac1085 on Tue Jun 03, 2014 9:40 am, edited 1 time in total.
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
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pac1085
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Re: Could this be used as a MAP sensor?

Post by pac1085 »

Ideally, if anyone knew what the honeywell part # is for the AEM 3.5 bar map sensor, that would be cool. That's exactly what I want to run but they mark the price up big time.

http://www.ebay.com/itm/AEM-3-5-BAR-50- ... c5&vxp=mtr
Current:
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elaw
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Re: Could this be used as a MAP sensor?

Post by elaw »

The first sensor you linked looks like it should work well, and is pretty reasonably priced for that type of sensor.

Best bet for calibration data would be to contact the manufacturer. The datasheet is a little confusing about that... it specifies that the output voltage is 0.5 at "Pmin" and 4.5 at "Pmax" but they don't say what Pmin and Pmax are! Most likely Pmax is the sensor's rated pressure (50 PSIA), and possibly Pmin is zero, but I'd ask them to make sure. Then you'll have to do a little math to get the "value at 0 volts" and "value at 5 volts" that TS needs to generate a calibration curve.
Eric Law
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Re: Could this be used as a MAP sensor?

Post by jsmcortina »

The maths looks to be the same as:
http://www.msextra.com/doc/ms3/generics ... l#settings
(scroll down)

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racingmini_mtl
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Re: Could this be used as a MAP sensor?

Post by racingmini_mtl »

pac1085 wrote:would that be
0v = -86 kpa
5v = 775 kpa ?
Yes.
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