MAF help

[v86]

So' I been using VGI's tool to try and get my LTFT down to about 3% with an Injen Intake.

Howerver, this has been my results thus far...
Each of these logs were an attempt at lower the LTFT, and are therefore with different MAF Volts and G/S values.


Log 1:
http://www.datazap.me/u/jokie/injen-1?log=0&data=1

Log 2:
http://www.datazap.me/u/jokie/injen-2?log=0&data=1

Log 3:
http://www.datazap.me/u/jokie/injen-3?log=0&data=1

Thanks

[BuBlake]

Originally Posted by v86

So' I been using VGI's tool to try and get my LTFT down to about 3% with an Injen Intake.

Howerver, this has been my results thus far...
Each of these logs were an attempt at lower the LTFT, and are therefore with different MAF Volts and G/S values.


Log 1:
http://www.datazap.me/u/jokie/injen-1?log=0&data=1

Log 2:
http://www.datazap.me/u/jokie/injen-2?log=0&data=1

Log 3:
http://www.datazap.me/u/jokie/injen-3?log=0&data=1

Thanks

I don't see a problem. I think your fuel trims look great. AFR is right on target. Are you doing 3rd gear pulls?

[steve99]

Originally Posted by v86

So' I been using VGI's tool to try and get my LTFT down to about 3% with an Injen Intake.

Howerver, this has been my results thus far...
Each of these logs were an attempt at lower the LTFT, and are therefore with different MAF Volts and G/S values.


Log 1:
http://www.datazap.me/u/jokie/injen-1?log=0&data=1

Log 2:
http://www.datazap.me/u/jokie/injen-2?log=0&data=1

Log 3:
http://www.datazap.me/u/jokie/injen-3?log=0&data=1

Thanks

as per bubake,s post it look prety good just a high bit in the 1500-2500 rpm area. its sometimes hard to get good data in that area, for maf scaling you need to drive smooth and steady with slow or steady throttle. if you can find a quiet area and gt some data fo steady driving in that rpm/flow range.

[v86]

Please, help me understand. How is this a good log.

Isn't my LTFT at the ~7%?

What am I looking to when it comes to an healthy log?
What is a good afr, STFT, LTFT, multiplier, etc..?

[Kodename47]

A "good" AFR is dependent on how your driving, cruising AFRs are different to partial and full throttle. STFT will vary and its STFT that create the LTFT. So long as its not pegged too far from nominal, some say +/-10% then don't worry.

Advance multiplier should be 1 but if its not dropping below 0.9/0.85 then it's not the end of the world.

[v86]

So' when looking at a log you first lay your eyes on the following:

Both STFT and LTFT should not be above 10%
Advance multiplier should not be below .87 on full throttle?

What else am I looking for?

[Kodename47]

Look though the links in @steve99's Sig. Lots of info and you'll learn from reading rather than spoon feeding as its all there in greater detail.

Just remember the advance multiplier only drops if there's enough knock and will rise once over a load threshold and it learns that the knock is no longer there.

[v86]

That was not my intention.

Both @BuBlake @steve99

Said that those were good logs and I'm simply asking why if LTFT is Obviously above 5%.

I'm trying to figure out how.

[Kodename47]

Originally Posted by v86

That was not my intention.

Both @BuBlake @steve99

Said that those were good logs and I'm simply asking why if LTFT is Obviously above 5%.

I'm trying to figure out how.

Because you have STFT averaging that. However the LTFT is set in regions rather than a flat trim across the range. It's because the MAF is out somewhere, however if the AFR isn't totally out of whack or producing lean ratios then I wouldn't worry.

[BuBlake]

Originally Posted by v86

That was not my intention.

Both @BuBlake @steve99

Said that those were good logs and I'm simply asking why if LTFT is Obviously above 5%.

I'm trying to figure out how.

What I looked at was Advance multiplier, command AFR and measured AFR(Which is simply called, "AFR" in the logs) zoomed in on a few of your 2k - 7k runs and found that your command AFR closely resembled your measured AFR. Any differences I saw between your AFR and commanded AFR were, in my opinion, probably within the margin of error of the stock 02 sensor.

Advance multiplier was also 1 across the board so your car is likely not pulling timing unless it's out of "KC Learned". If KC learned in the logs matches your advance multiplier(must be 1 or it's retarding timing due to knock correction) multiplied by "knock correction max advance A" in the active cell, then you're running full timing.