wideband logging

[EagleMark]

i figured a good trick for open air calib, though, since this wideband is in a really hard spot to access now... just hook a vacuum cleaner up to the exhaust and disable the injectors while cranking for a bit. purges the living hell out of it for open air calib. in a short amount of time, the calibration reads just like it did in totally free air.

Using a vacuum cleaner really sucks...

[steveo]

....

[steveo]

i'm definitely making progress, and realizing how super useless the narrowbands were.

my ve tables are starting to look like what i'd naturally expect for this cam, i have my maf tables closer (the stock curve was rich on the bottom and lean on the top), and i managed to get idle to 14:1, way less disgusting than the 15:1 that closed loop forced on me.

i got closed loop running again, and tuned PE to what i figure should be 13.0:1 (stock bin is ~11.1:1), and took a drive to see how close to target i was

but i couldn't get it into PE. it was a bit damp, and it wouldn't hook up on the highway anymore, even from an 80kph roll it almost broke loose into oncoming traffic.

i think that's a good sign. or maybe i need new tires.

[EagleMark]

i think that's a good sign. or maybe i need new tires.

To much HP is a good sign and even tires won't help on wet roads...

I don't know why the LT1 $EE is so much harder to do with NB, but it is way easier with others ECM/PCM/Masks. With aftermarket cams the idle and low RPM are usually more human work then data in all to get it right, following the slope of accurate mid range data into your 3d graph.

[steveo]

im not really sure why it's such a pain, but with a wideband behind it, i can see how screwy CL really was...

[steveo]

thing is, even with my o2 median voltages set at 500mv, once the trims stabilize, it's still ~15.0:1 long average on the wideband in most operating ranges.

this sucks because when i was running pure open loop at 13.5:1 to get a good reference point for scaling tables, it was running so smoothly, and now you can feel it's just not quite in the right territory...

i think i might just make sure PE is always active when the thing isn't cruising, and tune PE to get my targets.

or should i try cranking the o2 voltages up a bit more? i bet it'll get pretty unstable if i push it too far. i at least want to get it closer to 14.7 under light accel..

or, maybe there are more parameters hidden somewhere that could be leveraged to force it into open loop during some ranges?

[EagleMark]

Did you ever find the Stoich AFR parameter? This could be the issue running E10 fuel? They are all set to 14.68 to 1 AFR. The first thing I do in a tune is set to 14.1 for E fuel and usually fuel trims go away.

The Stoich AFR Parameter is the first thing the fueling calculation looks at!