5 Bar MAP sensor
5 Bar MAP sensor
For a 5 Bar MAP sensor use a scalar of 1250 and offset of 625
This works for the AEM and Motec 5 bar MAP sensors (0.5V = zero absolute pressure, 4.5V = 5 bar absolute pressure).
This works for the AEM and Motec 5 bar MAP sensors (0.5V = zero absolute pressure, 4.5V = 5 bar absolute pressure).
Hondata
Would it be possible for you to provide the same info for the Motorola 2.5 bar, based on this graph from their data sheet (bottom of page 3 on here: http://rocky.digikey.com/WebLib/Motorol ... SERIES.pdf )? I used 521.6 for a scalar, but have no idea what to use for an offset (if I even need one).
MOTEC 3 BAR MAP P/N
Is the MOTEC 3 BAR MAP's Part number M 160749 (page 38 of the MOTEC catalog)?
http://www.motec.com/catalog.htm
http://www.motec.com/catalog.htm
Re: MOTEC 3 BAR MAP P/N
Yes.90ludetsi wrote:Is the MOTEC 3 BAR MAP's Part number M 160749 (page 38 of the MOTEC catalog)?
Hondata

 Posts: 9
 Joined: Thu Sep 04, 2003 11:36 am
Here is how to calculate the scalar and offset.
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.
So:
1. For the AEM 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
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 exterpolate the lines until they cross the pressure axis.
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.
So:
1. For the AEM 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
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 exterpolate the lines until they cross the pressure axis.
Hondata
Thank you
Thanks for the lesson. I appreciate it.
Thank you
Thanks for the lesson. I appreciate it.

 Posts: 3
 Joined: Sat Dec 31, 2005 6:25 pm
i have to buy a map
now i have to buy my map for my s300 and i think i seen it on the hondata website that the 3bar map goes up to 29 psi but accel have a 3 bar map that goes up to 44psi and i want to know what is the true psi of the 3bar map. also i wanted to know if i could use the aem map. would it make sence just to buy a five bar even if i don't boost crazy hi. just to have it for when i do AEM rates there's a 75 psi for there 5bar map