I see there are three tables that control the output for "off idle"upper and lower thresholds, and the fast R/L threshold tables.The R/L offset vs. Coolant table is looked up and the value stored at L00F6.This is Subtracted from the values in the 3 tables to allow some leaning to occurr at different temps if needed.Currently the offset table is zero'd out (in stock bin)Rather than individually changing the table values to get where I want to go, I'm looking at doing a code change.The code ONLY has a SubA function for all of these routines, and can only allow leaner readings. If these were changed to reflect "AddA" op codes I think the adder would allow tweaking to a richer mixture in CL. This would allow you to change all the values across the board with a single entry.I realize the NB is not going to perform well at higher values but wanted to try it anyway. Trying to get a feel how far anyone pushed the values to get results.Anybody have any numbers?

 

Well JP for me I have had idle issues and I set the offset to lean out the idle but I have still not tackled the entire problem. Problem is I was not necessarily getting what I wanted. My direction is to use the WB and tune in open loop to get my actual AFR's to follow my commanded AFR's. Once I have an OL tune that I know is what I want I am going to go CL and see where the big BLM differences are then tune accordingly. I think this is back to try this then change that as opposed to using the WB to get my tune to follow my commanded AFR's.

 

I've had the same idle issue and tweaked the idle constants leaner but as soon as you are off idle... right back to the 14's in cruise.
Idle is a bit better but not solved in my view. Still a bit rough below 850 not in gear. In gear I have just enough trans resistance to smooth the idle.
I hope I get some time to try it this week and see if its a worthwhile venture.
I just don't want to be in OL all the time to get what I want.
Will probably make a straight OL bin to really go full out but for everyday cruising it would be nice to have a little better AFR. (No cat to worry about)
The tables have about 88mV window span until you get into the upper end and it opens up to 160 mV. At the very end the numbers don't make sense to me. The span comes back to 60 IIRC and the R/L threshold is way below the window values (0.44 ??)

Could be because of inherent overshoot at that range or it just never comes into play because of PE being engaged at high MAP.
Unless someone has already BTDT and can share I'll just have to experiment.

 

My direction is to go full OL to get what I want and then run the bin in CL to see where I am off then try to correct the O2 parameters, etc to get my BLMs to say what my OL tune likes. I am also thinking that I want to be in CL only when I am at a steady state condition so I that when I gas it the system almost instantly goes into a OL condition. When I am cruising then it goes CL.

 

Are you planning to accomplish that by setting the PE threshhold to a low percentage throttle setting?

 

Probably a bit more than that but I need to go over all the tables. I definately want it to be in PE mode though without having to punch it all the time. I have 2 main issues and I am not sure if it is my cam with my 1.6RR's that is causing it. I had the same cam on TPI with siamesed runners and World S/R heads and it idled perfectly. I put some AFR 195's on along with a LT1 intake and 1.6RR's with the same cam. Since then I have had some idle problems and WOT lean conditions above 4k when the heads really wake up. I am working on getting my actual AFR's to match my commanded AFR's throughout the entire RPM range while in OL. I then want to go CL and get my BLM's in line with my AFR and PW settings by NOT using the VE tables or at least doing minimal changes to them. I instead intend on concentrating on working on PW adder and O2 constants tables, etc. to bring the BLM's towards 128 based on the OL tune. My expectation then is that future engine mods will be more in line based on the current setup.