Isn't that like cheating?? IE; forcing the ECM to run the injectors at specific pulse width regardless of load. I realize that 128/128 is the goal, but if you lock the BLM at 128, aren't you preventing that parameter from making the adjustment to the injector pulse width??!! I believe the BLM is used for major adjustments, and the integrator for finer changes. Seems like you would want the BLMs to be fine tuned first, then work on the integrator??

I just got the ability to set the BLM min/max limits via TC's new TDF. The defaults were 108 and 160. I set mine to 110 and 140, just to start with. I have been working on the MAF tables to bring the BLM numbers close to 128. I think the tables should be tuned up first, before locking the BLMs to 128. That way your MAF will be calibrated correctly. I am not sure how the integrator changes with airflow. It seems impossible to get the MAF numbers perfect!!

IE, what to do when you have different BLM numbers at the same airflow? I think a realistic goal would be to have the BLM vary from 126-130, throughout all loads/rpms/airflow/etc. That is kind of what I am shooting for, but I can allways make a tweak here or there, since there is no limit to the number of chips I can burn. Just takes some serious time!!!

Thanks for any discussion.

------------------
Best ET 14.413 @95.57 without
pulling valve covers or manifolds.
Also with stock 2.77 rear end!!!

 

 

Grumpy is right. Locking the BLM Max/Min is for "fine" tuning after you have made changes to get it witin +/- 10 on the BLM.

If you BLM is too far out (ie, very close to 108 or 160), then you will trigger an O2 SES code (rich or lean as the case may be).

Also, I have noticed that after a lot of testing and getting almost all of my values very close to 128/128 (there are limitations just due to the precision of using a 255 byte field), I still find that my BLM may change dramatically when I "open up" my BLM values again. This is generally after I just turn on the engine and after a few minutes of driving it stablizes very close to 128.

Lastly, Grumpy is very correct about constantly making changes. My eprom has been very close for a long time. Most guys would have called it quits a long time ago.

But, I am constantly looking for new things to play with, along with seeing if there is something else that can be tweaked. Right now, I am increasing the accuracy of my MAT Inverse Look Up Table now that the weather is warming up. I began at -20*C and I am constantly modifying it as we get closer to hotter summer weather. Its all in the quest of better knowledge and finding something new to play with.

 

Thanks for your opinions, fellas. I always like to hear what others have to say abo9ut my ideas, since I still think I am an amateur at car tuning.

With my latest chip, my BLMs are running in the range of 124-134, which isn't too bad considering what you said above. I am going to do some more tweaking to the MAF tables and try another chip tonight. I have never gotten any O2 codes with my car. When I started, the BLMS were low, 108-115. I raised the injector constant to 24, and that brought them up quite a bit. Now focusing on the MAF tables.

I suppose I will slow down on the tables, once I get the BLMs a little better, then maybe lock the min/max BLM constant to 128, and see what happens.

 

With BLM values that you are currently getting, you should not encounter any problems with getting O2 rich/lean SES codes if you set the BLM Max/Min to 128/128.

In fact, the "finer" INT setting will help you dial it in better. Just remember that 5 INTs = 1 BLM. So you need to make smaller adjustments to make a change to 1 INT.