InjectedSS
10-30-2003, 06:54 AM
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
DOOM Master
10-30-2003, 07:35 AM
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.
InjectedSS
10-30-2003, 02:34 PM
Originally posted by DOOM Master
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?
DOOM Master
10-30-2003, 05:20 PM
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.
TwEaKeDSS
03-27-2007, 03:32 AM
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?
2xLS1
03-27-2007, 01:28 PM
(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.
Paul94Z
03-27-2007, 05:23 PM
(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..