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Assuming that the stock map sensor's maximum reading is 1764 Mbar, the formula to convert MAP byte value is ((1764 / 255) * [[OBD1]] _8bitMBar / 2). When the rom's map value has been [[uncorked]], simply remove the last division which results in the formula ((1764 / 255) * [[OBD1]] _8bitMbar).
New Page 1
OBD1 Honda Map Sensor Information
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Stock Map:5/255*((Raw/2)+Fuel Cut)
Boost Map: volts=(5/255)*(Raw+fuelcut)
**Fuel cut stock is 24 and editable at 0x4dcc** |
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2.85 V=0
"1.0V=20"
(20-0)/(2.85-1)=m
(y-0)=20/1.85(x-2.85)
inHG=20(volts)/1.85-30.81 |
2.85V=1013mbar
"1.0 V=336mbar"
(1013-336)/(2.85-1)=m
(y-1013)=365.9(x-2.85)
mbar=365.9(volts)-29.9 |
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Raw |
0 |
24 |
48 |
80 |
128 |
176 |
208 |
224 |
240 |
256 |
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Volt |
0.471 |
0.706 |
0.941 |
1.255 |
1.725 |
2.196 |
2.51 |
2.667 |
2.824 |
2.98 |
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mbar |
142.3 |
228.4 |
314.5 |
429.3 |
601.5 |
773.6 |
888.4 |
945.8 |
1003 |
1061 |
|
Raw |
0 |
12 |
24 |
40 |
64 |
88 |
104 |
112 |
120 |
128 |
|
Volt |
0.471 |
0.706 |
0.941 |
1.255 |
1.725 |
2.196 |
2.51 |
2.667 |
2.824 |
2.98 |
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mbar |
142.3 |
228.4 |
314.5 |
429.3 |
601.5 |
773.6 |
888.4 |
945.8 |
1003 |
1061 |
Raw values shown above are for a P72/75. Most if not all OBD1 ECU's follow this rule though so its just a matter of plugging in different raw values. Feel free to edit anything that is deemed incorrect.
-- bigwig - 21 May 2005
| Attachment?: | Modify: | Size: | Date: | Who: | Comment: |
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 mapsensor.jpg | mod | 10674 | 21 May 2005 - 03:46 | bigwig | |
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