Quote:
Originally Posted by XfireZ51
Scott,
Funny you should mention the MAT/IAT relocate. Something else I have been toying with looking at in terms of making sure the ECM is accurately interpreting the data its getting. The MAT v Compensation table assumes the temps the MAT will see are much higher than an IAT will report to the ECM. Air temp at the radiator will vary much less than at the airhorn. Then there's the issue of the MAT sensor heat soak.
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It should be noted here you are talking about closed loop situations and open loop situations as if they are the same, they are not.
Most of the above is talking about drivability issues but apply in open loop, once the engine goes closed loop (154 deg) the closed loop adjustments essentially render them moot. IE if the O2 sensor sees a rich mixture caused by inaccurate MAT it will adjust fuel to lean the mixture as long as it is closed loop.
The other thing to remember is when you go PE (pedal to the medal) none of the above apply as you go straight to PE tables that ignore any input from the various sensors.
Tyler