Disassembly: Manifold Pressure Differential Sensor

[Greg E]

It's late and I'm very tired so I'm not going to get into too much detail about this.

The stock MDP sensor is a simple 1bar sensor on top of the plenum in OBD2 cars to monitor if there's positive pressure in the plenum so the ECU knows when to shut the purge and EGR valves.

For a while now, I've been testing the EVO X map sensor in my car. The idea is to datalog boost pressure using EVOScan and the flashable ECU. The EVO 10 uses a 3.25 bar MAP sensor that can measure up to 32 psi of boost. This sensor is nearly identical in appearance to the stock sensor, so it can be easily swapped in for some plug and play fun.

If you pop off the stock sensor, you'll see a space with a small hole. I believe this cavern is just an area to keep air turbulence away from the sensor so the readings are more accurate.



Here are the 2 sensors side by side. Note: the EVO 10 sensor is the one with the yellow cap on it.





No one would have a clue...


Part number for this sensor is 1865A052 and it's available for $145.16 plus shipping thru MitsubishiParts.net - Your #1 Source for OEM Parts and Accessories

Anyone who is running or planning to run the EVOX MAP sensor, you will need this information in order to keep the periphery bit enabled and pass emissions. Go ahead and add this to your V1 Chromed ROM.

V2 update! Since I've figured out how the emissions tests work, most of these values do not need to be updated. Only the EGR Offset table. I've also eliminated the second EGR table (both tables were the same values anyway).



Change the EGR MAP Offset table to the following values:

750 84
1000 84
1250 73
1500 65
1750 60
2000 55
2500 48
3000 43
3500 23



In V2 you need to set the sensor scaling in order for EVOScan to show accurate numbers. Here are the settings!



These values are ONLY for the EVO 10 MAP sensor! I have no clue how to make any of the other sensors out there work with the emissions.