I have been reading the sticky article on tuning the VE tables.

I just want to say that I tuned my 1st chip the other day and have fairly close 128 BLM's values across the board. I am roughly + / - 8 from 128 and most of the time like right on 128.

But what I don't understand and am hoping for someone to clear it up a little is this.

My BLM at a certain stage is 128 yet my INT is like 90! I was under the impression if you have 128blm's then the INT should also be 128.

I read that Glenn says to use the INT to fine tune the BLM. With every difference in INT from 128 that an adjustment of .2 to .3 gets him on the money.

In most of my tables the INT and BLM value are either the same or pretty close to each other. Yet in somce cases I have a BLM of 128 and an INT value in the 90's.

So for example if my INT value is 90 and my BLM value is 130 for a given KPA and RPM. I would adjust the VE like this:

90 - 128 = -38 x .2 = -7.6

So I deduct 7.6 from the VE value in that cell? Is that correct?

It just seems to me that is a very big change to get the BLM down from 130 to 128 by reducing the VE by almost 8.

Am I on the right track here?

But by doing that does not make much sense cause I have other cells that have a BLM value of 128 yet the INT is like 120. So deducting from the VE would through me away from 128 blm when I was there already.

Maybe I just don't get it. Or maybe the problem is that I did not have my BLM's locked.

BTW where do you lock the BLM is it setting the max and minimum BLM values both to 128 from 108&160?

 

Did you reset the ECM before putting the
new chip in? How long did you drive and
how long were you in that troublesum cell?

You need to look at the "learn" flag of the
ALDL data to find out if the ECM was tracking
INTs to adjust the BLMs in that cell or not
and you may have to drive in the cell for a
number of minutes before the changes affect
the BLM value..

Setting the BLM min/max values to 128 will
lock it, then you tune all by the INTs..

mike

 

Mike, I did not reset the ECM (meaning disconnecting power right)

I drove the car for about 20 mins with the new chip in. When the INT is like at 90 and the BLM is at 128 it was there for a very short time. The length of the time it was like that was around a sec. I have my data logging set to capture 10 scenes per second.

Might have to lock the BLM and then try to use the INT to tune. Tuning with the INT is like I described above or do you do it diferently?

 

Anytime a major chip change is done, you should
reset the ECM (power) to clear the BLMs which
are stored in RAM in the ECM

1 sec was probably not enough time to start the
BLMs to start reacting to the INTs.. And again,
check the LEARN flag to see if updates had even
begun in that cell..

Same way, you just don't have the long-term
saved ajustments of the BLMs.. It's kinda
the same thing as tuning the BLMs and resetting
the ECM after each chip.. (Thats the way I
tune..)

The math you describe doesn't really sink in
with me though? Tuning BLMs (INTs) is done
on a percentage bases.. If your BLM is 90%
of 128, you need to take away 10% of the VE
in that cell to compensate.. (VE tuning is
covered in the stickies unless I'm missing
the question?)

mike

 

I know how to calculate the VE value suing BLM values but to really fine tune the chip you use the INT values. This is also mentioned in the sticky I just wanted to make sure the way I want to do it is correct.

No worries I will reset the ECM and see what happens.

 

BTW How do I know if the LEARN flag??

What do I look for when I use my Moates cable and software??

Thanks,
Mike

 

In my copy of Moats, the column is labled
"Learn Control Enable Flag" and is column
HJ when the .csv was loaded into excel..
The Learn flag should be a 1 when the BLM
is capable of being updated..

HTH
mike

 

I just had a look at the csv files i have and I have no such column. Maybe you have a different version of software?

I have the 8.52 version