LNF LTFTs

I know its late, and im more than likely over looking it...

But previous tuner disabled LTFTs on car im looking at.

How can i reenable... Flying by Short terms isnt helping very much

deleted- wrong vehicle.. my bad

who's car are they shut off on?

Stephen kenney

New guy, some dyno shop tried to tune DI like a PI car

Plug the evap connector back in, right on the front of the IM.

If anything I delete maf sensors because they can get to twitchy but that forces lt mode on by itself.

so which tab in hpt enables/disables the LTFTs?

Their isn't a table to disable it. You disconnect the Evap Purge Solenoid to disable LTFTs.

...or log the sum of (LTFT+STFT) without disabling anything.

Iambroke he said they were already disabled. You do not have to disable them for tuning. I find it better to disable them though when you have cat warmup disabled. That's my preference though.

I disable LTFT's on most of the cars I tune, even 750hp LSA's with E67's!

You should definitely disable LTFT's during and after you've nailed down the tune. LTFT's are a safety net for mismatched or broken hardware, big fuel quality swings, big altitude and weather changes. Obviously you wouldn't want to build a factory tune without LTFT protection. If your tune is dialed in though and you don't have any climate or hardware changes, LTFT's will just do more harm than good, ESPECIALLY on an LNF. Most ECM's have many different LTFT cells for rpm and load. The E69 has ONE LTFT cell! How ret@rded is that? So if your maf cal is off at idle and you're running rich, when you go WOT that negative LTFT is just gonna confuse the WOT mixtures.

Get your tune so that the mixtures are close in all conditions and running on STFT's will be perfectly fine and actually result in more consistent fueling.

^Nailed it. I was too lazy to type that. =)

Haha same here. In fact I almost responded to GMTechs post and was to lazy to do that. Lol.