MAF Info

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MAF Info

Postby yoda69 » Sun Aug 23, 2009 11:50 am

I've been having a bit of a look at trying to work at the MAF info from some BIN's.
Looking at several that have the 8 tables and the scalars I think the following maybe correct.
For each MAF Table there are 12 bytes of data, ie
02 C2 05 00 13 2A 44 61 81 A4 C9 F0 (MAF Table 1 from CNPF, $4D44-$4D4F)

The first 2 are MSB LSB, ie combine to $02C2 which converts to 674 Decimal.
This value is then divided by 256 which gives us 674/256=2.6328

The next one is a single byte, $05 which converts to 5 Decimal
This value is then divided by 256 which gives us 05/256=.019531

grams/ sec = (0.019531 * X) + 2.6328

While this didn't work with the delcowizzids $A6 MAF tables (which area a work inprogress, I think they may need updating), it does work with a $5B5.xdf and AZKT calibration.
Refer attached spreadsheet for calculations I used.

Would appreciate any feedback (good or bad) on this info.

Thanks,
Greg
Attachments
MAF Calculation Info.rar
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Last edited by yoda69 on Sun Aug 23, 2009 9:05 pm, edited 1 time in total.

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Re: MAF Info

Postby delcowizzid » Sun Aug 23, 2009 12:23 pm

nice info mate yeah never trust anything i come up with LOL maf tables could be way out in my xdf ive never had to use them to see if they even do anything or what they are supposed too do i based them off the VS xdf i had when i was making the vt xdf they ahve the same figures as the VS maf bins in there i know that much thats how i found them in the first place
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Posts: 1179
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Re: MAF Info

Postby yoda69 » Sun Aug 23, 2009 12:31 pm

That's alright, it pointed me in the right direction, I was trying to find them for the $A5 VT bin, in CJKU they start at $4FC0 for the first table value. Sorted out my problem with TunerPro, didn't have the size of the bin specified, ie.$20000. All appears OK, will just have to figure out a few more tables. Will update the file in the first post a little later with some additional info.

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Re: MAF Info

Postby yoda69 » Sun Aug 23, 2009 9:10 pm

OK,I've updated the file at the start of this thread, there are 2 sheets in an Excel spreadsheet.
The first one is my ramblings of trying to figure it out, and the second oone is populated with VT V6 MAF info from CJKU/CJKW.
At the bottom is a calculation showing the % difference between the end of one MAF Table and the start of the next, the highest difference was 0.17% so it looks good.
If people are playing around with the MAF values, it would be good to check this, as if the gap between tables is large I think most people can envisage the problems.

OK, of to bed for me and will have a look for some more VT $A5 tables during the week, well more defining the tables, I've found a lot, just don't know what they all are yet.

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Re: MAF Info

Postby antus » Sun Aug 23, 2009 11:10 pm

good to see someone working on the newer bins, keep up the good work! :thumbup:
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