Quote:
Originally Posted by jamesm
if you're on pump gas and the only thing you've changed is related to the intake (the filter and trimmed snorkel) then it would be reasonable to adjust the maf, it just doesn't make sense that it would require an across-the-board correction like that unless the diameter changed, which i don't believe it has given your description. typically any changes introduced by something like a filter or altering the airbox would look more like turbulence, less like global correction.
you are on pump gas, correct? i'd recommend going back to stock maf scaling and creating a proper fueling error chart from at least 30k rows of data, just to see where you really are now. there is very little to learn from looking at trims in the log without applying some math and making the data more reasonable to interpret. in fact you can be led very far in the wrong direction by just looking at raw logs without filtering and processing.
once you have good reliable data to go on, you'll see if changes are necessary and know (pretty much) exactly what to do to fix it.
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You totally lost me at "30k rows." If you have a link or source on how to do this and what's required I would greatly appreciate it.
Here is an earlier log I took with the unmodified v1.42b tune:
http://www.datazap.me/u/solidone/91-...2-3-4-7-8-9-10
If you zoom in on the first spike in rpm to red line you will see the LTFT at +12.5%~17.19%
Here's after I modified the MAF scale:
http://www.datazap.me/u/solidone/maf...2-3-9-10-11-12
I understand that looking at fuel trims and adjusting one parameter is probably not the best way or the right way, but it produced good result. Stays on the target AFR's without much or any correction by the ECU. I've worked on cars for a while, but am an total noob when it comes to electronic engine management. Closest to "tuning" fuel and ignition I've done is rejetting carbs and installing woodruff key to advance timing or making a car pass CA smog test. I need to get schooled in this stuff. It's all mumbo jumbo to me right now.