Me and a friend are building a hand-held ECM scanner with WBO2 and 3-bar MAP inputs with logging capabilities.

We're having problems reading knock retard, though. The data line in Word "0" is supposed to be:

52 GP6ENOCK KNOCK RETARD
DEGREES = N/2

However, the output is around 20 degrees at idle, 30 degrees at full throttle, and 0 in the middle. Max in my TunerCAT file is 16 degrees, so these numbers can't be correct. I think it's odd that "degrees = n/2" allows a number up to 255/2, or 128 degrees when the knock retard stays under 20 degrees.

Anybody have any idea what I'm doing wrong? What's the correct formula?

Thanks,
Mike

 

Okay, we figured it out today. Get this, with manual cars, knock retard is N/2, but with automatics, it's N/16. My buddy set it up for a manual since I have my auto functions disabled (TH350).

Mike