Ive tried the formula but i cant figure it out. this is for a Motorola 3bar here is the data sheet can anyone tell me the calibrations for my s300?

http://www.freescale.com/files...A.pdf

its the MPXH6300 for future searchs

i posted this on teh hondata forum im getting no love so can anyone calulate this for me so i can it.

 

i cant make any sense out of this

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by "Spunkster" &raquo;</TD></TR><TR><TD CLASS="quote">MAP Scalar and Offset
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Here is how to calculate the scalar and offset for a MAP sensor.

1. Find the minimum and maximum voltage and absolute pressures.

2. Convert the pressures to mbar.

3. Subtract the minimum and maximum voltages to find the range, then do the same for the pressures.

4. Divide the pressure range by the voltage range to calculate the scalar.

5. Multiply the minimum voltage by the scalar to calculate the offset. Note that a positive voltage gives a negative offset.



Example for a 3.5 bar MAP sensor:

1. For a 3.5 bar data sheet:
0.5V @ 0 kPa (absolute)

4.5V @ 345 kPa (absolute)



2. 345 kPa = 3450 mbar.

3. Voltage range = 4.0V, pressure range = 3450 mbar.

4. 3450 / 4.0 = 862.5 = scalar

5. 862.5 x 0.5 x -1 = -431.25 = offset

So scalar = 862, offset = -431

Plug in the minimum and maximum voltages to check your work:
0.5V x 862.5 - 431.25 = 0 mbar @ 0.5v

4.5V x 862.5 - 431.25 = 3450 mbar @ 0.5v



If you have trouble then draw a graph and extrapolate the lines until they cross the pressure axis.</TD></TR></TABLE>

 

Chris, you just select Motec 3 bar under the Map sensor tab, the end.

 

thats what i was thinking.

honestly i was. he hee.

 

thats the same as Motorola 3 bar?

 

i mean if you say so lol. but the math isn't different?

 

It will be close, but likely they don't use that exact sensor element. As long as you check your partial-load cells (vacuum) and retune if needed, it will be fine.


But to do it according to that formula, you take the datasheet's numbers:

0.3v @ 20kPa (200mbar), 4.6v @ 304 kPa (3040mbar)

4.6v - 0.3v = 4.3v range

3040 - 200 = 2840 mbar range

2840 / 4.3v = ~660.45 scalar

0.3v * 660.45 scalar * -1 = -198 offset

 

wtf is this?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by "Hondata" &raquo;</TD></TR><TR><TD CLASS="quote">This sensor does not read low enough for use in a car (min reading 20 kPa = 200 mbar).</TD></TR></TABLE>

i don't believe it. thats coming form the same people that said you cant run dsm injectors

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SwappedTURBOegg &raquo;</TD></TR><TR><TD CLASS="quote">wtf is this?

i don't believe it. thats coming form the same people that said you cant run dsm injectors </TD></TR></TABLE>

They posted that years and years ago. Anyways, I have not worked with a motorola 3bar but I know the MSD 3 bars will not work properly even when I calculated the proper values. I always use the MoTeC 3 bar map sensors with the s300 units.

 

gay ill have to buy a 5bar now

 

200 mbar is ~24" HG - the only time you'll see that is when you decel from moderate-high rpm with zero throttle, and at that point, the ecu is already cutting the injectors. Idle shouldn't be below that under normal circumstances. The other motorola sensors supposedly don't read below that, and they work fine.

 

yeah i used this map sensor no problem with crome.

 

so much for not using it. its been working pretty well so far. idles great too.