Scanner MAPs?

[Rich Z]

OK, I'm a newb so I can ask dumb questions like this. Actually I hope I never get beyond the point of not feeling embarrassed to ask basic questions of this nature.

I've been reading over what I can find on the map files used in scanning, and honestly I feel like I'm the dumb kid on the block because I don't think I quite grasp what these are and what they do.

The "Scan Tool Getting Started" tutorial has a half page blurb about them, but doesn't really explain much about the utilitity of their usage. From what I THINK I can gather from this, a map file is a two dimensional grid displaying one value on the X-axis, and another value on the Y-axis. The data that is actually captured via scanning is plugged into the cell intersection of those two axis to show the values in relation to that grid. So if I wanted to scan for something like AFR, I would set up a map with RPM on one axis and perhaps intake manifold vacuum/pressure (for boost) and have the scanner plug the AFR data into the relevant cells in that display. Does that sound close to being right?

Granted, I'm still not finished reading the Scanning Tutorial, and maybe MAPs are explained fully there, but in case it is not, is there any other resource that would help me to better understand this concept? Oh, I did find some threads with links to external resources, but they were old threads with dead links, which is quite frustrating.

Thanks.

[tokymon]

you want to build youre maps with the same data and units as what youre trying to tune ( ie. ve table , timing table)

[joecar]

Hey Rich,

Don't feel embarrassed or anything... please do feel free to ask questions



A map displays data on an X-Y grid (like you said)...

the data displayed can be AFR or SPARKADV or KR, or it can be a calculated value (e.g. CALC.VET), or it can be a correction factor (WO2BEN), like toymon said;


correction factor is the ratio of PCM-commanded fueling to wideband-measured fueling, for example:

WO2BEN = {GM.EQIVRATIO}*{EXT.WO2LAM1} = {EXT.WO2AFR1}/{GM.AFR}

correction factor is used to multiply a table (to correct it), for example the B0101 VE table or the B5001 MAF table;


so you want to make you map to look exactly like the table you want to apply the map to; to easily create a map do this:
- in tunetool goto the table of interest (e.g. B0101),
- click in empty tile in upper left (highlights whole table),
- on that empty tile do rightclick->Copy with labels,
- in scantool goto the Maps tab, goto a letter tab (e.g. A),
- click the map properties button,
- on each of the Row and Col tabs click Paste Labels (very handy),
- on the Data tab select the pid you want to display (make sure you choose the one with the correct units),
- on Data, Row, Col tabs click Show Units,
- save the map with a suitable filename and exit the map properties.

[Rich Z]

Thanks. I'm getting a glimmer of what you can do with these. I'm assuming that you can cut and paste in the other direction, then? From scan map to tune table? Or at least be able to figure out some sort of correction value from what you see in the scan map to tell the tune to "make it so, Mr. Zulu"?

[joecar]

Yes, after you create a map and populate it with data from a log, you can apply a filter and you can copy the map and either paste it or paste-multiply it into a table.

Have a read thru the Calc.VET thread, it builds and applies two maps (WO2BEN for MAF and CALC.VET for VE):
A-New-Twist-on-CALC-VE-Table-Computing-the-Entire-VE-Table


You might want to have a read of the scantool/tunetool user manual pdf's, these contain very useful info:
EFILiveV75Scan.pdf
EFILiveV75Tune.pdf

( some of the sections are outdated (the software keeps changing), but the info is still useful )

[Rich Z]

Yes, after you create a map and populate it with data from a log, you can apply a filter and you can copy the map and either paste it or paste-multiply it into a table.

Have a read thru the Calc.VET thread, it builds and applies two maps (WO2BEN for MAF and CALC.VET for VE):
A-New-Twist-on-CALC-VE-Table-Computing-the-Entire-VE-Table


You might want to have a read of the scantool/tunetool user manual pdf's, these contain very useful info:
EFILiveV75Scan.pdf
EFILiveV75Tune.pdf

( some of the sections are outdated (the software keeps changing), but the info is still useful )

I'm actually going through the scan tutorial now as I figure it's best to get that under my belt (relatively speaking) before worrying about the actual tuning part yet. My car is driveable, with some relatively minor driveability issues, so I'm not in any real hurry to absorb this stuff. This would be nearly impossible to do to just buy this software with no knowledge with the intent of FIXING a pressing problem immediately. I'm guessing you could make things worse in a real big hurry.

"Fire - Ready - Aim" doesn't normally work too well with anything I have ever tried.