Different Map questions

[silentshout]

Greetings All

I have a few questions about some maps ive been finding while disassembling the bin from my car.

I found what I first believed to be a 2d map that seems to be a 256x1 map with no headders or anything before or after as the decimal numbers start at 0 and rise linierly up to a set number (33400 from memory but im not too sure), However after asking around people have told me it looks like a possible 16x16 MAF conversion map.

My question is what exactly is a MAF conversion map used for by the car? I tried google however all that comes up is a bunch of forum posts about people converting their cars to bigger MAF units so maybe its called something else.

My other question is in relation to factors, offsets and conversions.

is there a list of common conversions etc around somewhere? as my ecu is practically untouched and theres no disassembly, damos or al2 files available for the car its making it hard to discover what certain maps are for.

I have finally grasped the concept of discovering maps and have found a large amount of maps both 16bit and 8bit that the winols auto detect failed to discover (not that I would trust it) however finding out what those maps are is difficult as the numbers dont match anything im used to (with the exception to the 2d RPM maps both 12x1 and 16x1, they were easy)


Lastly is a question that im finding difficult to find the answer to, and that is are there any techniques for finding the corrilation between 2d axis maps and the z axis data?

The siemens simtec ecu has the axis data at the start of the cal file and the maps in the second half of the file and finding the relationship between the two is prooving difficult.

Im hoping that if i can find out what the z axis data (map data) is through the conversions etc, it will hint towards what the x and y axis data will be.

you can find my progress on this forum here: https://pcmhacking.net/forums/viewto ... =17&t=3929

In there you will find my .bin file and a very very raw .xdf im working on,

And heres the link to the Project more in depth on the OA forums (forums for my car) : http://www.opelaus.com/forums/showthrea ... ck-Project

Im pretty sure you dont need to be a member to view so feel free to have a look and any experiance is greatly appreciated.

[The1]

MAF conversion is either 0-5volt or 0-12000hz or whatever the freqency scale of the MAF is, there is those two different types, then the ecu will typically have a lookup table to convert it into grams/sec of airflow.

Many people have different ways of reversing code, for me and the early systems we look at here the easiest method ive found is finding out what the Processor and what the syntax is for it, then you can start to map things out.

[antus]

That was good read on the opel forum. Great to see the story end to end and the new maps as you find them.

MAF stuff can be tricky, in GM its not just a plain table, as it has bunch of banks with offset or multiplier data to get it accurate across a large range without costing more bits in the cal area. I suspect the siemens wont be like that, so you should base your logic on whats found in some other siemens pcm. For reference, our spreadsheet for calculating the tables for delco enhanced are here under tuning aides. Its good theory, but in practice its quite unlikely that yours is set up the same. http://pcmhacking.net/forums/viewtopic.php?f=27&t=2518