liquidh8

Ok, So I am running the EBL classic, BBC TB, 90pph injectors, 22 PSi max w/VAFPR. While datalogging, with the EBL or my snap-on scanner, my WB would read 14.0-14.1 AFR, and the EBL displayes 128-132 BLM. Commanded AFR in Closed loop is 14.7. Is there a way to get this right, i.e., make the computer see 14.7 AFR as 128 BLM, because it is off right now. The NBo2 is reletively new, but no matter, because it was the same for the previous o2's. O, they are heated also. I think if I can get this closer to 14.7 stichio, I may even pick up some fuel mileage.

Thanks guys for any and all advice.

RBob

iTrader: (1)

To bracket stoich set these tables:

# INT - Lean O2 (Lower)
# INT - Mean R/L
# INT - Rich O2 (Upper)

As. . .

Lean to 425 mV
Mean R/L to 450 mV
Rich to 475 mV

And the same for these values:

# INT - Idle O2 window Terms

In the tuning guide sticky under the '8063/'8746/'7747 section is a write up on fueling. This explains the use of the O2 window.

RBob.

liquidh8

thank you rbob, I forget about those write-ups sometimes and go right to the search. lol

Thanks again, I'll have to try it out.

liquidh8

Question: In the process of changing the o2 swing points to get the BLMs to read 128 at the commanded afr as read by the WB, will I have to change ve VE tables to get the BLM back to 128? Since I am at 14.1 AFR with a 128 BLM, (the int o2 tables were the EBL.bin tables), I am thinking I will have to lean out the VE tables some to get it to read 128 again. Is this correct?

RBob

iTrader: (1)

Yes, to get the BLMs back to 128 the VE will most likely need to be changed.

RBob.

liquidh8

I may have to cough up the dough and get a new o2. This one is swinging and all, doesn't seem lazy, but I lowered the thresholds, and raised them even. by 150 each way. And the ECM keeps displaying lean to me , the BLMS are 138 or so at cruise, steady state, and it is adding fuel. The WB is showing 14.1. Now at Idle in closed loop itis reading fine? 128 with a 14.7 +/- .1. Do you remeber the P/N for the delco 3 wire o2?

JP86SS

iTrader: (1)

Pretty sure it was AFS-74
The 4 wire is AFS-75.

liquidh8

Thanks for the reply JP, I was just gonna kill some time this morning and search to find it. lol. I'll try and order one from Rock auto, so my o2 swing point tuning will have to wait a few days.