OK I think i've got the closed loop's figured out it's just these damn open loop tables that im really unsure of.Someone else please fill in the other blanks.

OPEN LOOP & MAF -
WOT -
PART THROTTLE -
IDLE -

OPEN LOOP & SPEED DENSITY -
WOT -
PART THROTTLE -
IDLE -

CLOSED LOOP & MAF -
WOT - PE Tables
PART THROTTLE - MAF Tables
IDLE - MAF Tables

CLOSED LOOP & SPEED DENSITY -
WOT - PE Tables
PART THROTTLE - VE Tables
IDLE - VE Tables

 

Open loop uses the table Open Loop A/F ratio x 10 (not exactly that, but it's something like that) for when the car is in open loop. I believe that is both MAF and speed density.

 

So it use's the afr x 10 open loop table for everything then? part throttle, wot, and idle?

 

No, just for idle and part throttle. WOT ignores the input from the O2s and uses the %Change VS RPM WOT and %Change VS Coolant Temp WOT regardless of open or closed loop.

 

I have a question, what is this value being based off of? You said it uses the %Change Tables but isn't the ECM calculating off of another table as well?

 

(1 - ([# in Temp Table] + [# in RPM Table])/100)*14.7
or
14.7/(1+Number in the Cool temp table/100+ number in the RPM table /100)

Either formula will compute the 'commanded' WOT A/F. That may not be what the 'actual' WOT A/F is as measured by a wideband O2 sensor.

 

Thats good information. Regarding MAF or SD... Need an accurately calibrated MAF for correct commanded A/F or accurate VE tables for SD. I gave up trying to recalibrate the MAF the previous owner hacked up.. no sense in trying to adjust around an unknown variable. I recently decided to try my luck on calibrating the VE tables for an SD tune and so far so good..