I posted this last night in another thread...
http://forums.stangnet.com/showthread.php?t=688872
I was hoping some of you guys who have relocated the ACT could offer some feedback.
Who knows, maybe something listed below will shed some light on a chronic problem you are having?
http://forums.stangnet.com/showthread.php?t=688872
I was hoping some of you guys who have relocated the ACT could offer some feedback.
Who knows, maybe something listed below will shed some light on a chronic problem you are having?
Since this has come up before, I decided to do a little research using the tweecer to check how the computer might react to lower than expected ACT temps/readings.
Here is my new writeup...
Hope it helps,
jason
How will the Fox computer react to the ACT being moved from the lower intake to the Intake Airbox?
Thumbing through the TwEECer (CalEdit) this is what can be seen...
In the X3Z Calibration
FN 825B - ACT will increase the engine idle rpm after about 192F, maxing out at 64rpm by 208F
FN 220 - EGR Multiplier is 0 until 58F, maxes out at 1 by 60F
FN 126 - Spark advance starts to retard at 160F maxing out at -2* by 190F
FN 135 - WOT spark advance is retarded starting at 150F, maxing out at -6* by 240F
FN 300 - Open Loop Fuel Multiplier is unaffected by ACT (always 1)
SCALAR - ACT MUST be between 100F and 200F for the Adaptive Strategy to start learning
In the A9L Calibration
FN 825B - ACT will increase the engine rpm by 48rpm at 200F, and a max of 72rpm at 226F
EGR Multiplier is .8 until 0F, then rises to a max of 1 by 56F
FN 126 - Spark advance starts to retard at 160F maxing out at -2* at 190F
FN 135 - WOT spark advance is retarded starting at 150F, maxing out at -6* by 240F
FN 300 - Open Loop Fuel Multiplier is .64 until -40F, .81 by 0F, and maxes out at 1 by 76F
SCALAR - ACT MUST be between 100F and 200F for the Adaptive Strategy to start learning
So what does this mean?
Idle speed – Obviously for both calibrations the affect is going to be minimal, assuming all other idle contributors are working properly. Moving the ACT to a cooler location should not have a major impact on idle speed.
EGR – Moving the ACT to a cooler location will affect the function of the EGR. It would not be recommended to try and pass an emissions test with the ACT in the airbox on a cold day (below 60F).
Spark – The Spark Advance is RETARDED with higher temps. Moving the ACT to the airbox can help to keep ignition timing higher. However, keep in mind that Ford used the ACT as a ‘Safety Factor’ for preventing high temp detonation. False information to the EEC-IV will make detonation more likely when the engine is warm/hot.
Fuel Multiplier – The Fuel Multiplier increases with higher ACT temps. Due to the low temps at which the ACT will impact the Fuel Multiplier this is not likely to cause an issue.
Adaptive Strategy – This may be the most critical one for most daily driver Mustangs. Not allowing the Adaptive Control to function (because the ACT never sees 100F in the airbox), could hurt fuel economy and could cause drivability issues.