VE tables and LTFT histograms?

**Firebirdjones** · 04-04-2007, 10:45 AM

Ah ha,,,,I found it. Interesting stuff. It says the higher the number the more decay it has. My graph peaks at 1.0 but the car has to be moving at I think 18 mph or more to reach this,,,,of course the table is for park or Neutral,,,,which doesn't make much sense,,,lol. Anyway at 0 mph the number is very low. Guess I could try increasing this number and see what happens.
Have you had luck playing with this at all? Any tips? Larry.

**Firebirdjones** · 04-04-2007, 10:46 AM

10-4 on the DFCO now, it is enabled on my car. I won't mess with it though, don't know understand much about it.

**12secSS** · 04-04-2007, 11:55 AM

Those tables pretty much define how much spark to remove once the pedal or MAP has reach a threshold. Once the timing has been reduced, it will basically turn off the injectors. It also controls how fast it should come back in line once the MAP or TPS is increased. Some have claimed around 3 mpg increase with DFCO enable, versus not having it.

**Firebirdjones** · 04-04-2007, 12:12 PM

Okay that helps a bit. Thanks for that bit of info. I think I will play with the throttle follower tonight and see what I come up with. Thanks again,,,Larry.

**mrr23** · 04-04-2007, 01:35 PM

Originally Posted by Firebirdjones

Hey Mrr23,,,are you logging your LTFT's for your VE table with the MAF disabled? I seemed to have forgotten this minor detail when I started and had to do it all over again,,,lol. Larry.

yes, MAF has to be disabled to do the VE table.

on a side note, i figured out how i got so lucky and hit 0% on aall of my cells after the first try. i, inadvertantly, set the closed loop enable temp tp 284*. so, i logged in open loop the entire time. oh well, at least it wasn't a complete waste of time, as i was logging on my way to work and home. will be logging later on to see where i'm really at.

**12secSS** · 04-05-2007, 07:54 AM

Originally Posted by mrr23

yes, MAF has to be disabled to do the VE table.

on a side note, i figured out how i got so lucky and hit 0% on aall of my cells after the first try. i, inadvertantly, set the closed loop enable temp tp 284*. so, i logged in open loop the entire time. oh well, at least it wasn't a complete waste of time, as i was logging on my way to work and home. will be logging later on to see where i'm really at.

Hmm, may want to give the ECM about 50-100 miles to learn the fuel trims.