Help with LTFT & STFT Stage 2 E85 OFT
 

So I’m currently running OFT Stage 2 E85 and My LTFT levels At Idle seem to be fairly decent my LTFT sits at 6.8% and my STFT at 0% but then once I step on the throttle just a tad bit and do normal driving, many times my LTFT Goes up to 8-9% and my STFT Go to around 5-6% sometimes even higher but then when I go WOT or around 70%+ throttle my LTFT Goes to 7.81% and STFT 0% which I know is decent but I don’t understand why sometimes when I normal drive my car is running lean? I’ve checked for exhaust leaks and I can’t find one. At first when I got the headers I heard like a hissy sound at the connection point from the header to the OP But a lot of ppl told me that it was the thinner metal of the aftermarket header that caused the sound because of the airflow. Also recently cleaned my MAF sensor and intake. So I was just wondering any ideas what it could be and how to fix it to run as close to 0% LTFT And STFT. I’m really new to some of this running stuff so I’m still learning. I also plan going FF soon maybe that will help? Thanks ahead of time guys!

Read here


http://www.ft86club.com/forums/showthread.php?t=64790




Pretty well ignore stft.


Ltft is average of stft over time period, its measured in several flow bands.


Fuel trims dobt mean you car is running rich or lean, fuel trim is the amount of correction the ecu is applying to attempt to hit its afr target at a load rpm range.


If you want to know if your rich or lean look at AFR and commanded afr


As your on E85 without flex senspr differing ethanol contents will see ltft change as ecu alters this to hit its fuel targets



Also read here


http://www.ft86club.com/forums/showthread.php?t=69871


Then if your still kean look through the coloured links below

The LTFT will change with E85 content. Don't try to make it perfect, you're only going to damage something. Plus once you make it perfect on this tank, the next tank will change and you'll be off again.

Read all the stuff Steve99 said to.

Ahhh I see thank you, And so range of AFR’s that are running too lean is higher then the targeted range and if it’s rich the. It’s less then the targeted range? Sorry I’m just trying learn a little bit here. Also do I shouldn’t be worried about my LTFT and STFT Going above 10% at times when I normal drive to mid range? I have a k&N drop in filter but idk if I would have to rescale that and maybe that’s why my fuel trims are kinda high at times?

Hey Steve I took 3 datalogs(Cruising, Daily Driving, and Daily Driving w/ WOT at the end) to show you and see your opinion if something is off, I noticed my LTFT are getting worse possibly... Thank you again man i appreciate your knowledge on this stuff.

https://datazap.me/u/juniorrr23/dail...t?log=1&data=1

The afr looks ok
No knock or flkc


Fuel trims a little on the high side, could jist be high ethanol content e85 like over 80%


Is your intake stock ?

My intake is stock but it has a K&N Drop in Filter and also a Mishimoto Inlet Hose. I wonder if that could be the issue. Aside from Intake or Exhaust leaks what else would cause such high LTFT? So according the AFR's then im not running necessarily lean then?

afr looks fine


high positive ltft could osle mean high ethanol e85 ie over 75% or dirty maf sensor from over oiled air filters if its oiled

Stg-2-Plus-E85 With K&N intake
 

I just got this tune on my car with a K&N typhoon intake and EL tomei headers and a invidia n1 catback, my ltft and stft seem high to me and I have some knock correction and flkc, should I be worried about this? I havent done any MAF sensor scaling, I am waiting until I get my front pipe and over pipe to get an E-tune, Is my intake causing these problems or could it be an exhaust leak or intake leak? I don't believe I have any.



https://datazap.me/u/collinlong/stg-...og=0&data=1-13