I got some good starting points from Bryan, but I've got some work to do. I realized I don't totally understand the process and the data - as my last set of injectors were too easy to scale

This is on pump gas.

Scaling:1624

Latencies:
5.424
4.032
2.232
1.464
1.176
0.864
0.600

The car starts and idles great.

My long term trims LOW - just stay pegged at 12.5
My long term trims MID have done the following. With the 1624 scaling they are shown in 1st Cruise. Because everthing looked very high I knocked down the scaling to 1535, and the trims are then shown in 2nd cruise.



So I have a couple of questions.

1. Which area of the plot on the MID trims do I use? They change alot. After 16 mins they still jump around???

2. Why are my LOW trims pegged at 12.5, this is with both scaling numbers?

 

What are your STFT at idle?

I would knock down the scaling a little bit more and see if you get closer to zero.

 

How long do I need to log the short term trims to have them stable? I'll do that when I get home.

What about my MID's what area of the plot contains the valid info?

 

STFT are the real-time fuel trims

LTFT are the learned values from STFT.

STFT move into LTFT and then STFT resets and trims as necessary. Rinse, lather and repeat.

It's good to look at STFT as well as that will tell you what it is doing at that very minute to compensate fueling.

Remember you have to reset the ECU on the Evo 8 after every scaling and/or latency change.

 

OK, getting better.

Scaling: 1329

Latencies: Same as above.

LTFT Low: 7
LTFT Mid: I'm not sure. After 4 cycles they were -4, but then jumped up to 1 by the 6th cycle... still don't know what area is considered valid.



Do I need to adjust latencies to balance things out or just try one lower step in the scaling?

 

I would bring up the scaling just a tad (high 13XX if possible) and add some latency at 14v and around.

Still not showing us your STFT's.

 

Bryan when should we look at LTFT low versus mid versus high? I never really understood that. I know low is idle. I apologize to jid2 for the OT question

 

Low is idle and around
Mid is cruise, etc

Scaling changes have much more effect on global fueling and WOT than latency changes.

 

Yeah that is what i thought. Thanks!

 

hid2: Are you running E85?

 

Not yet. I will be.

I dropped the scaling down one notch (1271) this morning for my commute and it made the trims widen.

Low:+8
Mid: -8

So I'm going to go back up and adjust the 14V setting like Bryan suggested.

Here's the plot from this morning.

 

Put the scaling up to 1392.

Latencies:
5.424
4.032
2.232
1.512
1.2
0.864
0.6

Still not there.

Low = 12
Mid = -4 to -5 ish

I guess I'll raise latencies some more in the 10-12V range?

 

how is it going? were u able to properly scale this injectors on pump gas?

 

More latency at 14v and a touch more scaling

 

F' me. I'm going around in 16 min circles.

I went out for a few hours and didn't make any progress. I got some stuff screwed up in my head regarding latency and I believe I made some poor adjustments and I'm about back to where I started.

I made myself a cheat sheet regarding scaling, and latencies with respect to A/F's, fuel, and trim percentage. No more getting mixed up and making the wrong adjustment.