PFC MAP Sensor Scale and Offset Settings needed

[Rich]

As the title says im looking for the Scale and Offset settings for a Haltech 3BAR MAP sensor to use with a PFC. Part number 12223861. I have had a look on the net and found the following settings neither of which are correct.

Scale: 44442 Offset: 260

Scale: 41800 Offset: 0

Is anyone else using one of these sensors, or know where I can find the settings needed?

Thank you.

[Fryman]

hmm ill find it for you

[Rich]

cheers

[Fryman]

ok couldnt find the exact 2 figures.. but if you want to do it correctly

some info from a tuning master in the US....

use these spreadsheets to help you... its not a simple process but you will know your map is calibarated correctly. god knows how many tuners leave these values on default or are incorrect and there for p vs n rows are all over the shop

http://www.charitymods.org/MapSensor/


The higher your boost goes the more inaccurate (low) the calculated PIM ABS values are. These values determine the P row which is used for fuel and timing. Depending on your map sensor, boost range you want to run, and turbo capacity; change these rows as needed. The stock rows above P16 increase by a calculated value of about 2.9 PSI. Stock turbos can not safely boost above P18 for long, and the P-FC under calculates boost which renders rows 19 and 20 useless.

You can calibrate your map sensor to correct relative pressures, and use the results to enhance the table's resolution. Using the same accurate gauge; 2 psi at sea level is 2 psi at 6000 ft. But measuring your vacuum reading will be more difficult.

You will need an air compressor or compressed air source; mini-vac for vacuum, and an air pressure regulator with accurate pressure gauge, and a DATALOGIT.

Attach the map sensor hose to the source of vacuum/boost with a long extension that will reach into the car where you will be operating the DL. You can also attach to your boost gauge. You can use my “Calibrate Map Sensor Work Table.xls” to record your vacuum and pressure values, and use Brian Davies' “Calibrate Map Sensor Pgm.xls” to correct the map sensor scale and offset so that the PFC and DL will show and log ABS and boost correctly. To do this requires a good knowledge of how the map sensor and Map Reference works.

From my test results on the next page, I used my PIM ABS pressure values for 6, 8, 10, 12, 14, 16, and 17.5 PSI for my P rows 14 - 20. When the DL displays a boost value such as 80, it really is equal to .80 BAR.
Most critical step is updating your fuel and timing for the new P rows. If this is incorrectly done, you may destroy the motor. Look at the timing and fuel from your old map and adjust the fuel and timing for the new P rows accordingly. You may have to average two old rows to get your new row.

This is the results of calibrating the stock map sensor with the stock SCALE/OFFSET
to an accurate relative boost.





Stock Setup My Modified Setup From Above test




After the above calibration and using the ABS values in Davies' software, it gave me the correct SCALE/OFFSET to properly setup the PIM scale/offset in the PFC. Then I reran the calibration to get the new corrected ABS values. These were then put into the MAP REFERENCE table. PFC pressure (in kg/m2) = scale * PIMV + offset - 10332.





Totally Corrected Setup For Stock Map Sensor







An example: My P Row 17 is suppose to be 12PSI boost and now has an ABS of 18750.
Converting this to psi we have:

18750/10000 = 1.875
1.875 X 14.22 = 26.6625 psi absolute
26.6625 - 14.7 = 11.9625 psi relative

Now the PFC and DL boost and ABS values match the real world!

PIM Scale, Offset

The DL UNIVERSAL version shows PIM Scale differently than the FD3S version. FD3S value divided by 6.66 equals the UNIVERSAL version.

Calibrated GM 3 bar setting; 43500/0 for FD3S or 6525/0 for Universal.

CALIBRATED direct plug in APEXI DENSO DPS-310-2000A (949940-6270) 3 bar map sensor:
45200/3300 for FD3S or 6780/3300 for Universal.