Originally Posted by BlUEMDsrt6
Reason I wanted to inject before the iat sensor was if I inject after the iat the ecu will still pull timing because its still reading the warmer aircharge after the intercooler (if my theory is wrong please enlighten me). I figure the intercooler system in these cars is too small and insufficient to really cool down the aircharge under heavy load anyway.
If you inject nitrous oxide before the IAT or on some cars the MAF was OK to do as long as it was only nitrous and not fuel. Now with water/methanol you have an atomized mist of liquid that can and will coat the sensor possibly giving it an incorrect reading. What you need to be doing is data logging your cars IAT values during runs or under severe loads where you "believe" it to be pulling timing and verify first hand that it is indeed doing that at a certain IAT temp. It does pull timing but the question is at what temp and by how much. Coating the sensor is just bad news and creates for to many variables. Use a dashkawk or some other stlye of datalogger that will give you KR,IAT,Timing Retard, and Actual Timing. You can also put resistors on the signal wire going out to the ecu to condition the signal back to the ecu.