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Old 10-20-2003, 09:13 AM   #18
chuglobal
Scooby Specialist
 
Member#: 10041
Join Date: Sep 2001
Location: Marietta, Ga.
Vehicle:
2015 WRX Limited CVT
ISM

Default Yo

1. The MAF sensor does NOT detect outside temperature. I checked weather channel and it's 70F+/- however the IAT was 42C+/- thus 107F which is a 37F+/- difference. I assume this is caused by the heat soak or other engine energy functions?

2. I changed my parameter for IAT correction at 45C w/ timing correction at +1 ... this should basically tell the UTEC to pull 1 degree of timing across the whole board once IAT is 45C+. My goal is to pull timing when outside temperature is 85+ which I'll need to figure what the IAT would be, I'll need to look at the dashboard one day in the future.

3. I have also copied the 50% column in the timing to the 10% column, I'll need to do some aggressive driving and see what happens. I just think it's weird to have the ECU @ 0% > UTEC @ 10% > ECU @ 20%-30% > UTEC @ 40%-100%. I would think it would be more rough to switch between ECU > UTEC > ECU > UTEC?


* 4. I upgraded from version 2.5B to 3.1 last Friday and reloaded my current map; everything went as planned according to the manual instructions. However after the upgrade the stock ECU is using a "safer" map thus richer. I suddenly got knock again where it use to be fine. I'm testing the theory that my knocks are due to "extra" fuel because I always get worse gas mileage after a ECU reset and knock started to occur again. The only variable change is the extra fuel being "dumped" into the engine. Why did the ECu switch to a safer map? I didn't disconnect the battery at first but I did later, it shouldn't have switched maps right? Has anyone else seen the extra fuel problem causing knock?
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