I have Tuner Pro RT and the Autoprom. I have been datalogging, reading, studying etc for some time to get a feel for minor programming changes to my 89 L98. I am using the stock APYN chip with minor modifications to idle and base timing set to 8 instead of 6. I installed a cam with 214/220 duration@.050. 452/462 lift, an AFPR, K&N filters.
After much scanning I have found that the engine ran lean BLMs in the upper 130s/140 even at idle.
I carefully started modifying the MAF tables to correct this. I started with Table 1 by moving the scaler and then aligning the last row with the first row in table 2. All seems to work fine. Now why when I start to modify 2 or 3 by either scaler or individual cell I develop terrific cutouts/surges? The BLMs also all drop to very rich throughout the airflow I'm attempting to change. The integrator also swings wildly and spends it's time in 112 to 120mv range when under 20 grams per second and in the double digit numbers on the freeway. I lose all stability in it like it doesn't know what to do. Neither do I
I've tried to modify table 2 and 3 a few times now with same results even though I have tried different approaches (scalar or individual entries). The scalars change things too drastically.
What do you think might cause the cutout when I modify 2 &3? I'm trying to keep each entry smooth to the next but I must be missing something. It doesn't happen with modifications on table 1. Sorry for the length but I'm new and . I've read, searched and tried but I'm not gettin r dun.

 

I changed all of the MAF tables back to stock except for table 1. It ran fine for about 10-15 minutes then went rich and began to cutout again. This is probably because I used the scalar. When I moved just an entry or two I don't get the cutting out. Table 1 only though. The cutting out occurs at idle or at cruise. Accelerating slightly might bring a stumble though not often.
Are they MAF tables extremely sensitive perhaps I am adjusting them too much? Is there a curve that I need to maintain precisely.

Just looking for a little pointer here so I don't spine my wheels. I'm not expecting anything definitive just maybe a tip or two. I can't find this problem in the search.
GWW

 

Up in the sticky's is a tuning guide book. There are several articles on how the MAF tables work. Other then that it almost sounds like you BIN definition file is wrong. You may not be editing what you think you are.

RBob.

 

That's why I'm confused, I've been studying all of the material here and other places I could find long before I purchased any hardware. I've started slow and I'm not seeing what I'm doing different from what I've learned. The issue may be the bin, though I have downloaded it from the Moates site multiple times. I recently (yesterday) burned an AUJM bin and I will see how this goes. Thanks for the idea!
Perhaps you can provide a little clarity onto what I may be not understanding about the MAF tables or the scalar tables. They seem pretty straight forward. Increase gms/sec at a given MAF voltage richens and visa versa. Keep the ends of the tables overlapping, close together in grams/sec, if not exact, if I change one individual entry I may need to change entries on either side of it if I create a sag in throttle response. The MAF tables and scalars apply to both close and open loop. I am just wondering as I have not been able to decipher hardly any of the hac yet if my small adjustments are affecting something else adversly(timing perhaps)?
Maybe it is just a bin problem.
Thanks