Ive been working on my own self tune for the past few weeks. Its been based off of the Stg2AEM_104 OTS map. After getting my 3-port dialed in, I can see Im at a consistent +5% LTFT. Meaning after reflashing new maps a bunch of times and resetting FTs, it continues to go back to +5%. This is causing my WOT AFRs to drop ~10.2-11. I know +5% is "acceptable" but its also making it more difficult to smooth at AFRs. Before adding a more linear boost curve with the 3-port, LTFTs were ~1-3% with a decent AFRs, 11.2-11.5. Im trying to get that back down to around 2% and after reading the small blurb Cobb put in the Help pdf theres not a whole lot to grasp onto. From what Ive read, if you adjust Cylinder FT A/B/C/D tables from 0 to 1, it should bring things closer to 0%? Anyone have any advise on trying to bring that percentage closer to 0%. Thanks

Pasted from Cobb's ATR guide:
Cylinder Fuel Trim A
Cylinder Fuel Trim B
Cylinder Fuel Trim C
Cylinder Fuel Trim D

Table Description –
These tables are fuel trim tables which use engine RPM for the X-axis breakpoints

and calculated load for the Y-axis breakpoints. The lower the value, the more fuel that is added for the given conditions on that particular cylinder.

I'd do it by MAF scaling and not touch the per cyl tables.

Yea I figured it would have to be way more complicated than just adjusting 4 tables one integer.

If both idle and cruise LTFT are high, just pop your injector scaler up 1 notch.

But I wouldn't worry about 5% that much. Mine are usually around 0%, but some days I see -5% and others 5%. But 80% of the time they are right at 0%.

FYI: Cobb's LTFT logs the "Active Trim", so when you are at cruise, it will log cruise, and when you are idling, it will log idling. If you swap from cruise to idle, you will see the trims jump or drop by a large amount. You can see this if you graph your trims against time. It will see mile it jumps between 2 different levels.

Why not just turn off WOT LTFT compensation?

Idle is fine at 0%. So its usually either at 0% idling, or ~5% at any given throttle position.

So you think I should just look to tune out the rich areas under the normal fuel map?

Why not just turn off WOT LTFT compensation?

How do you do that?

I'd do it by MAF scaling and not touch the per cyl tables.

Very few ever do it with the cylinder tables. I agree with Bryan.

Why not just turn off WOT LTFT compensation?

I don't think they can with AP can they?

You can't.. Or I should say that we can't. I know HB Speed can.

You can't.. Or I should say that we can't. I know HB Speed can.

Is that something that an authorized tuner is able to do with the Pro version of ATR?

That I'm not sure of. Bryan has mentioned that he can... that's all I know.

I just came across this thread:
http://www.evoxforums.com/forums/showpost.php?p=287623&postcount=6

And it made me think I just saw some new fuel tables in the updated ATR:


http://i284.photobucket.com/albums/ll22/kirk212/atr.png

So should I adjust the 3mid to high and 4high to mid from 1587.5 to 300 and 293.75?

I just came across this thread:
http://www.evoxforums.com/forums/showpost.php?p=287623&postcount=6

And it made me think I just saw some new fuel tables in the updated ATR:


http://i284.photobucket.com/albums/ll22/kirk212/atr.png

So should I adjust the 3mid to high and 4high to mid from 1587.5 to 300 and 293.75?

Hijacked from elsewhere...

http://img200.imageshack.us/img200/1251/closedloopctl.png

So anyone know if these are the tables that need to be changed to stop affecting LTFT at WOT as per explained by Clipse3GT?

I know the values are slightly different than what is shown from Ecuflash but it seems to be the same thing....:confused:

So anyone know if these are the tables that need to be changed to stop affecting LTFT at WOT as per explained by Clipse3GT?

I know the values are slightly different than what is shown from Ecuflash but it seems to be the same thing....:confused:

I posted them one post above yours...Change the values as outlined and shazaam!

I posted them one post above yours...Change the values as outlined and shazaam!

Alright cool thanks. I just changed it so Ill see how it goes in the morning. Ill post up how it goes.

It would be nice if someone from Cobb could verify that these are the same tables. It looks obvious but it would still be nice for a definitive answer. Its nice to see that Cobb is making an effort to improve their products for us Mitsu guys.

Im happy to say that it worked. Thanks all for the info. Now finally us guys who use ATR can eliminate the headache of LTFTs when at WOT. :yay:

well i am having the same problem you are having but with dw 1000cc on my car how can i fix the problem ???? also i am waiting for my AP to get back here cause the screen when all black lol! i am planinng on making a trip to plano cobb

well i am having the same problem you are having but with dw 1000cc on my car how can i fix the problem ???? also i am waiting for my AP to get back here cause the screen when all black lol! i am planinng on making a trip to plano cobb

I wouldnt neccessarly call it a problem, just more of a pain in the ass. So heres how to fix it.
First thing, read this:
http://www.evoxforums.com/forums/showpost.php?p=287623&postcount=6

Second: Request the new ATR software from Cobb:
http://accessecu.com/register/cobb.php

Once you have that, you will see there are a handful of new tables. The ones you need to alter are "Closed Loop Fuel Trim", the Mid to High and High to Mid. Should look like this:
http://i284.photobucket.com/albums/ll22/kirk212/atr.png

All you need to do is change those two tables (mid to high & high to mid) as shown below

http://img200.imageshack.us/img200/1251/closedloopctl.png

After that, your LTFT will be 0% at anything above 30-40% throttle.

thanks bro !!! i will try it out when i get my AP back from Cobb

Great info guys. I have yet to see the latest ATR software, so I had no idea that they added this.

I guess I need to update my software. :nerd:

You can't.. Or I should say that we can't. I know HB Speed can.
You can turn it off in ATR now. The exact same way as ecu flash, by adjusting the hertz value.

You can turn it off in ATR now. The exact same way as ecu flash, by adjusting the hertz value.

Late to the game but they still made it! Good job Cobb!