Stft: between -5.6 and 3.2

Ltft: -15.6

Are these bad fuel trims for a hptuned 08 lnf?

 

The long terms should be much closer to 0.

 

Like Matt said your ltft should be much closer to 0. What mods do you have?

 

My ltfts are like -20 now, tuner is working on it lol

 

Dejon cai. Zzp catless. Hptune

 

Your tune needs touched up for your dejon cai

 

Thanks Ecaulk.
What are the negatives to havind bad fuel trims? Im thinking of getting a k&n. I know I still need a retune.

 

You're constantly adding/subtracting fuel, when you go WOT your not fueling correctly (generally) and could spike lean or rich. If you have hptuners check out the hptuners forum for the how to on maf trim adjustment, really hard to screw them up if you follow the how to

 

If his LTFT is -15 he is running rich correct ...the majority of the time?

 

If ur negative its rich, positive is lean ..... Its real easy to fix and adjust with a few logs.

Mainly focus on ur cruise and idle ..... Wot u can look at ur afr and see what that reads

 

There is a good chance its off at WOT, but if he follows the how to on hptuners he'll get it cleaned up. Just save you files with different names so you can always revert back

 

Dont own hpt....

 

Then get retuned, who's your tuner?

 

Bought car with mods and tune in 2012. Just got an interceptor to monitor this a few weeks ago.

 

That's kinda what I was figuring.

 

wonder how many people were about to blame trifecta before they read the last line.

 

I thought the same thats why I stated it was hpt.

 

So does anyone know if I could just buy the k&n filter and if it will fit the dejon piping? Or should I just replace the whole sri with the k&n one?

I dont see the need to buy the pipe too. My dejon filter is probably as old as the car lol.

 

Buying a different intake wont solve all the problems, jus get hpt or go find someone to fix it for u

 

Changing in the intake wont help, you will need a retune no matter what intake you buy.

 

If your trims are that far off the ecm needs to make drastic swings to hit a commanded lamda. While this will effect drivability and possibly fuel economy in normal driving areas, this isn't where the danger lies. What the bigger issue here is when you go wot. If the trims are too far off the ecm will lose close loop control and default to open loop fueling. This is where potentially bad things can happen.

 

Whose car was it?

 

No idea. I called vince and he said the vin didnt come up that he tuned it. So I figured hpt because its not gms1 or trifecta, yet it hits 22#.

 

Guess im done going wot. What bad can happen though if I may ask?

 

Which intake tends to cause the least LTFT problems?
When I had a SRT4 we found the OEM intake was so good that a drop in air filter was all we needed...
Isn't there a OEM intake mod that increases the HP equivalently to a K&N intake and yet doesn't cause fuel trim issues?