Hey Im tuning my 6E lately and I don't fully understand the relationships between the MAF table and their scalar values. If I change the end point of one of the tables I would assume that I also need to adjust the adjacent table that picks up where the first leaves off so they match. But I seem to recall that each of these tables also gets divided or multiplied by the MAF scalar value (unless its the last).

Question is - do I have to adjust the scalars to ensure the tables form one continuous curve at their boundaries when changes are made?

 

The tables all overlap as they define the flowrate of the maf in terms of the A/D counts. Change the end of one and the beginning of the next table must be changed as well in order to have a smooth transition. The scalar provides a way to store teh airflow values without having loss of resolution from the hex values in the table becoming too small. If your MAF values in a table get to 255 and you need more room to adjust, then you can adjust teh scalar to not scale teh table up so much. Theres no need to adjust teh scalar when other tables are being worked on, it only pertains to the table its associated with.

 

so what is the equation that relates total airflow used to calculate PW that uses the table entries as well as the scalar for that table. In other words you are saying that the scalars multiply the numbers in the table? and that if the table entry times the scalar is > 255 then I need to lower the scalar?

so do i need to match the first and last values in the tables only or the values in the tables times the scalar? and you are saying that the highest value in any table times the scalar for that table should be < 255 (FF?).

 

Maybe this will help

Table one with a scaler of 255
1, 2, 3, 4, 5, 6
Table two with a scaler of 255
6, 7, 8, 9, 10, 11
Table three with a scaller of 355
11, 12, 13, 14, 15, 16

******************
is the same as,

Table one with a scaler of 64
4, 8, 12, 16, 20, 24
Table two with a scaler of 128
12, 14, 16. 18 20, 22
Table 3 with a scaler of 255
11, 12, 13, 14, 15, 16

last and first numbers need to be equvilante.

Scaler * table entry = a given number representing a given airflow.

HTH

 

Youll only need to change teh scalar if the values in teh table aproach 255 and you still need to add more represented airflow. 256 / scalar value is what all teh actual airflow values are multiplied by to obtain the raw values you actually see in the tables.

Also, if teh values in the tables get too small, you can change teh scalar to increase the magnitude of the values stored in teh table. If you had an airflow of 3.5 grams/sec and put it in the table with no scalar, youd only be able to represent it as 0x03. Youd loose the .5 grams/sec. By having a scalar, you can increase teh resolution of teh stored 8 bit values in teh table.

 

BINGO -- thank you.

I now understand better. I will have much better instincts for how to change these tables now that I know what Im doing.

I use tunerpro and I now understand that the tables you bring up are already multiplied by the scalar for you.

Incidentally this information is lacking in all the previous reading I did. Hopefully someone is including it in the new prom intro article.

BTW dimented I LOVE your avtar...

 

Now explain it back to me
It almost gets second hand with a lil use.

It's around here somewhere, I've posted about the same thing several times. I'm sure it will be.

 

Hehe... Thanks. That things pretty good.

I aggree with grumpy, all the info's here somewhere in the old threads, jsut that sometimes you have to dig a bit to bring it back up.

 

well thanks for not shooing me away at asking a repeated question. (no sarcasm intended)

 

NP, sometimes that old stuff is hard to find.