Thought i'd post this here in-case anyone is interested in giving this a try, taken from my build thread in my sig. Applies to OBD2 only
Fairly simple implementation:
1. Cut the grey wire going to the IAT
2. Relay wiring
Pin 30 - connect to the grey IAT wire that is still connected to the ECU.
Pin 87a - connect to the grey IAT wire that is still connected to the IAT sensor.
Pin 85 - connect to a ground wire with a switch in it.
Pin 86 - connect to any red/white wire for 12v.
Pin 87 - connect a 60k ohm resistor and then wire tap this into the grey/brown IAT sensor wire.
What this will do is intercept the IAT sensor reading and send a -25c temperature reading to the ECU.
Then you just need to adjust the flash so that your correction tables will retard timing when the IAT sensor is -25c. I like to aim for -10 degrees of timing. The values in the attachment should target that for a stock ms41.2 rom (obviously this will be different once you're boosted).
I haven't tested this on a running car, however was testing in the garage while logging and on ACC and confirmed that i didn't throw any CELs.
Fairly simple implementation:
1. Cut the grey wire going to the IAT
2. Relay wiring
Pin 30 - connect to the grey IAT wire that is still connected to the ECU.
Pin 87a - connect to the grey IAT wire that is still connected to the IAT sensor.
Pin 85 - connect to a ground wire with a switch in it.
Pin 86 - connect to any red/white wire for 12v.
Pin 87 - connect a 60k ohm resistor and then wire tap this into the grey/brown IAT sensor wire.
What this will do is intercept the IAT sensor reading and send a -25c temperature reading to the ECU.
Then you just need to adjust the flash so that your correction tables will retard timing when the IAT sensor is -25c. I like to aim for -10 degrees of timing. The values in the attachment should target that for a stock ms41.2 rom (obviously this will be different once you're boosted).
I haven't tested this on a running car, however was testing in the garage while logging and on ACC and confirmed that i didn't throw any CELs.
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