So I went to start tuning the ecu and...

[futurevr4man]

yeah i changed fuel values and then reflashed. i have done it 3 times now, and the trims are still stuck at 12.5

on top of that, arent the values supposed to zero out and reset themselves everytime you do a reflash? because mine have not done that

[futurevr4man]

Also, it takes 16min for the long term trims to update. Make sure you're changing the MAF comp values with-in the correct HZ range of the trim you're trying to adjust.

are you referring to the VE table? do you recommend we tune off that still, or should we change the big fuel table like the evo guys?

[Greg E]

yeah i changed fuel values and then reflashed. i have done it 3 times now, and the trims are still stuck at 12.5

Adjust the MAF Comp (VE) tables to get your trims back with in spec.

on top of that, arent the values supposed to zero out and reset themselves everytime you do a reflash? because mine have not done that

No. Where did you read that? The only way to reset the trims is to reset the ECU. There might be a MUT command to reset them but I haven't figured that out yet.

[futurevr4man]

so i just need to make an adjustment, then go out for a long drive every time to let the ecu properly adjust everything then?

would you say that the VE table is for the big changes, and the fuel table is to get the fine tuning perfect?

[Greg E]

so i just need to make an adjustment, then go out for a long drive every time to let the ecu properly adjust everything then?

would you say that the VE table is for the big changes, and the fuel table is to get the fine tuning perfect?

The fuel table is more like your target AFR table. The MAF Scaling table is for fine tuning. The MAF Comp (VE) table is for big changes.

[futurevr4man]

The fuel table is more like your target AFR table. The MAF Scaling table is for fine tuning. The MAF Comp (VE) table is for big changes.

that makes perfect sense. the maf scaling table is what converts from hz to actual amount of air (grams/second) from what i can tell. i have never even looked at that table before.

the only thing that doesnt make sense to me is still why my fuel trims havent changed. i have gone up about 3% across the lower Hz area of the VE table, and then driven for at least 20 minutes and they didnt change a bit. not even .1%...

[Greg E]

Just curious. You didn't disable any of the bits in periphery 0 did you?

Are you trying to tune the low long term trim? That one only adjusted at idle.

[futurevr4man]

Nope, didn't disable any of those bits. And I know the low fuel trim is tuned out at idle by the oxygen sensor feedback.

My mid and low fuel trims are at 12.5 and my high is at zero. My afrs sit perfect sometimes then like hitting a button go real rich (high 12's) or lean (high 15's).

I am having a REALLY bad lean spike that happens as soon as boost is coming on. The lean spike is my biggest concern and I'm having a real hard time getting rid of it. The wideband usually hits about 18.0 then it more or less gets past a point (I can't seem to find a common denominator on what that point is) then it's fine and the car pulls either partial throttle or wot with no issue.

I know these are noob questions and I'm sorry :/

[Greg E]

Add more % to the Accel Enrichment TPS Delta Multiplier table. The white numbers on the left hand side correspond to the difference in your TPS % from how far you push the pedal. It won't fix the cause of your lean accel, but it'll help cover it up.

...remind me again. Are you running an open atmosphere BOV?

[futurevr4man]

Yes I am but I am also running a blow through setup. I also have the 3.75L engine so I expected a lean spike or two