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Has anyone been able to run a 2BAR MAP with the ECM in SD mode for a 96 vette (ODBII)? Attempting to tune the idle but can't get the trims to kick, in closed-loop mode. In MAF mode the trims work. I assume the ECM is ignoring the 2BAR MAP.
I have the injector constant @ 50% of the injector size. and I halved the VE MAP table up to 55kpa. The car runs an idle of 12.5 AFR with no trimming in closed loop.
It appears there is some sort of threshold before the trims kick in. I just can't figure it out. Any thoughts? The 2BAR MAP idles @ ~0.6v vs the 1BAR idles @ 1.2V....
How do I tune BLM cell 16 the "Fuel Trim Cell" reserved for idle?
For Speed Density Mode: Under SWITCHES: Calibration Options: you need to enable "speed Density Mode
"How do I tune BLM cell 16 the "Fuel Trim Cell" reserved for idle?"
Once `you are in SD Mode you will use your VE table to adjust this cell. Just log where your Idle Map and RPM values are and adjust the VE in that region
Also, Under Fuel Tables - Look for " BLM Cell MAP Boundaries" Check to see if your MAP values are relevant since you went to 2 Bar. May also want to check your values in " BLM Cell RPM Boundaries" to see if they will be adequate to meet your driving ranges
Good starting values for the BLM Boundary Tables would be as shown:
Yes, I have the "speed Density Mode" flag enabled.
Curious: Are you seeing short term & long term trims at idle or at 750RPM with the 2BAR MAP? Or are you honed in on the VE table?
Trying to determine if I am chasing my tail.
Yes, have also toyed with the
BLM Cell RPM Boundaries / I have tried to cut them in 1/2 and other ranges. I am able to affect the AFR - BUT I just don't see the ECM doing any trims at idle. I am only able to get the trims to fire if I do a hack with a potentiometer and get to 32kpa..
I believe your current setting of "BLM Update Enable MAP 20 kPa" is too high for Idle, since you halved your MAP for 2BAR SD Mode.
Try decreasing this value to 5 Kpa
96 Vette 2BAR MAP in SD mode
