O2 windows, specifically on the 16197427 $0D

[EagleMark]

Back to topic!!!

So if you have your tune close would there be any benifit to closing the gap of swing points?

[PJG1173]

you can use them to essentially change the target O2 mV where the ECM considers the rich/lean transition to be, i.e. Stoich.

some masks don't use single values though and use tables based on airflow/etc.

yeah thats what the article said i just couldn't get my fingers to type what I was thinking. What I'm thinking is I can use these tables to basically recalibrate the O2 to compensate for the long tube hedders, or was I reading that article wrong?

[RobertISaar]

yeah thats what the article said i just couldn't get my fingers to type what I was thinking. What I'm thinking is I can use these tables to basically recalibrate the O2 to compensate for the long tube hedders, or was I reading that article wrong?

that's entirely possible.

There's a WOT locker program in the $EE information thread that locks BLM/INT to 128 during PE like your talking about. Way cool! I added 20% fuel to PE table and O2 right and O2 left stay around .900 during WOT!

yeah, but what happens when you get a bad batch of gas(high ethanol) and to compensate for it the PCM has to drive the BLM up to 140 or so to maintain stoich in closed loop? that's 10% more fuel than what a BLM of 128 would deliver. then you go PE, it resets and instead of the 20% fuel added via the PE table, you only get 10%. now you're at a target AFR of ~13.2:1 instead of ~11.8.

[EagleMark]

Glad I set that up with the 93 non ethanol! I was actually trying to get some things worked out for last day at track to get a time but rained out last day of season... Now I've been just daily driving with no other changes to those type settings, I wonder what the O2 sensors would read with 10% ethanol enhanced fuel? Great, now I have to go do a WOT test! But I can't it's snowing...

You also got me thinking cause I ran a tank of 87 10% ethanol fuel and had to take out the four degrees timing I had added in there. I blamed it purely on octane, but it may have been stioch of fuel? Stock LT1 timing showed 1 degree retard from knock in a couple places, add 4 degrees and 93 non ethanol and no retard from knock.

Was going to add 4:56 gears and Nitrous too!

But I may be pulling engine and trans for project or my Suburban and parting out the car. Dealer I got it from can't come up with title, filed complaint, he went out of business... got registration though? Don't know if I will ever own it? Can't sell it?

[RobertISaar]

could have been the E10's lower stoich ratio, could have been the lower octane, hard to tell without running E0 87 back to back with E10 87.

NORMALLY, you won't run into retard issues after the O2 sensor accounts for the fueling discrepency, since you'll then be running stoich at the same octane, but with that BLM locker stuff? hard to tell.