EFIDynoTuning Forum

nope never had this problem that wasnt a simple fix

I can only divide the existing value 2 more times. I can either use .13 or .25. Anything .07 or less goes to 0. I tried this last year and dividing it from 4 to 2, to 1, then to .50 and there has been 0 improvement.

As I expected, Setting it to .13 or .25 made no improvement. In fact, the issue seems worse at .13 than it does at .25.

Should I maybe look at transfering all of my data to a fresh t4m2 tune? This has been going on for 3 years with 0 progress made.

Go the other direction with it. Increase manifold volume and dial in the bottom of the maf til you get it ironed out.

Is there a way to view the log as a linear graph like BE instead of watching it play back? Is the MAF history running average an accurate way to look at the LTFT? mine seems to vary from what the LTST displays in the gauge view during playback. As an example, my idle LTFT is between 1 and 1.02 while watching it play back but the running average shows .97. Im thinking I dont know how to use the histograms correctly

it also factors in the short term fuel trim as it shows the fuel error

I notice differences like that as well. Are we maybe paying too close attention to the fuel error at all times instead of the LTFT?

Here is a short log of what my car is doing. I pulled out of the driveway shifted up to 3rd to my corner, made the turn and then went up to 4th and stopped the log. There was only a very short hardly noticeable stumble shifting into the 3rd after the turn. I could live with this but would love to get it dialed in better. When I got to work I held the throttle sitting in neutral at 200 and 225 IMAF counts to double check as I've always had trouble trying to dial these points in and it looks like it was off by 10% and 7% KAMs and FE were 1.10 and 1.07. I made those adjustments to the MAF transfer.

perfect example why you should never have negative fuel trims

You need to go to fn1303 the accel enrichment table and kick up accel enrichment at that 100 ect

the car is cold though, once it warms up the trims are really close to 1, I actually brought them down some recently due to the recent conversations we've been having here on that subject. Are you saying this issue has something to due with negative trims? I have dialed and re-dialed the MAF again and again trying to fix this issue and it doesnt really seem to effect it.

Ok will do, should I multiply that entire row? and by how much double? I've never really understood the x axis of that table.