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View Full Version : Quick question about my MAF Cal logs


MZR87
11-05-2012, 06:57 PM
In the middle of doing a maf cal, but I've noticed on my most recent log the LTFT's usually go to 0 around the 30g/s breakpoint, as if the car has entered open loop at that point. isn't that a little early??
loki
11-05-2012, 07:09 PM
In the middle of doing a maf cal, but I've noticed on my most recent log the LTFT's usually go to 0 around the 30g/s breakpoint, as if the car has entered open loop at that point. isn't that a little early??

are you pushing pretty had on the gas that you're causing the car to enter open loop?

also, maybe it's calibrated fine for that range already

post up a log for the MAF calibration, though you might need 60 more posts to do so..
MZR87
11-05-2012, 07:26 PM
http://www.filehosting.org/file/details/391037/mafcal1.xls

Try that, the log starts around cell 140 as I started logging at idle
Fobio
11-06-2012, 11:05 PM
http://www.filehosting.org/file/details/391037/mafcal1.xls

Try that, the log starts around cell 140 as I started logging at idle

I'm not posting my email address to download your log. TM3 can accept .csv file for uploading...maybe even .xls.

The breakpoints are to be to observed as guidelines rather than strict limits or cutoffs for a particular range. 30g/s is hardly open loop...
MZR87
11-06-2012, 11:38 PM
I'm not posting my email address to download your log. TM3 can accept .csv file for uploading...maybe even .xls.

The breakpoints are to be to observed as guidelines rather than strict limits or cutoffs for a particular range. 30g/s is hardly open loop...

Yes, I'm well aware 30g/s is not open loop, that's why I'm wondering why the ltft's have already gone to 0 at that point. Maybe the last adjustment I made zeroed in that breakpoint well enough? Sorry about the attachment, I cant post any at the moment untill I'm past 60 posts or so I've been told
Fobio
11-06-2012, 11:41 PM
Yes, I'm well aware 30g/s is not open loop, that's why I'm wondering why the ltft's have already gone to 0 at that point. Maybe the last adjustment I made zeroed in that breakpoint well enough? Sorry about the attachment, I cant post any at the moment untill I'm past 60 posts or so I've been told

You are tuning a MAF curve. A cell or a row is just a point on that curve. Don't get hung up on single points...look at the big picture.