First stab at adjusting fueling '95 LT1

[Dirtybob]

So I've finally swapped out my 2.56 open rear for 3.42/yukon posi and have begun to tune the car a little.
It's a stock '95 roadmaster with the only mods being "home plate" delete and 3" pvc running from the stock airbox to the elbow @ the throttle body.
Analysis of my first set of logs showed the car was running pretty lean and had a few knock events between 4300 and 4800 rpm at WOT.
Attachment 11012

Made some changes to the MAF tables and reset the target afr to 14.1 to reflect the el cheapo 10% ethanol gas I normally use. FWIW the knock events disappeared and the log anaysis looks like this.
Attachment 11013
Attachment 11014

I'm currently researching PE fueling and timing changes but am in no hurry (prefer to do this at the dragstrip since my butt dyno isn't well calibrated). Just looking for a little feedback, areas I could work on etc....
attaching the most recent log and bin file if anyone wants to have a look.
Edit: seems my log file is "invalid" as an attachment...

[steveo]

your fueling looks perfect

stock pe is rediculously rich from the factory especially on the b-bodies. a lot to be gained there

[Dirtybob]

I recall reading somewhere that 880 mV is an appropriate (narrowband o2) value for WOT operation. Any truth to this?
No plans for a WBO2 in the near future...

Decided this morning to copy the timing tables from a stock 95 impala ss bin (a bit more total advance and comes in quite a bit faster than the roady bin) and am seeing knock/kr again. Primarily above 4k rpm and 85+ kpa. Filled it with premium and it made no difference so am currently lowering the timing and logging the difference(s) in between the grandbaby tearing down the house and the dog being sick.
It definitely likes the more agressive advance curve, much more tirespin now.

[lionelhutz]

You really can't equate that voltage to the correct AFR for WOT. Every O2 is different and the same O2 even reads differently depending on it's element temperature.

[Dirtybob]

will just have to get it out to the dragstrip then.

[steveo]

wideband is ideal, dyno is better, but if your trims are near perfect even at high rpm/load (might have to disable pe to get enough data up there) you can dial an afr target for pe and probably get close. try to calculate about 12.5:1, should be safe. you'll usually hit peak power near 13:1 but the difference is small.

as far as spark goes, bbody spark tables are for load hauling. but iron heads don't need a lot of spark advance to hit peak power either. eehack's spark skew will help a lot in finding ideal timing...