I got a tune for my lightning swap from Justin@vmp and the truck is not running right (sputtering under load ). I was wondering if one of you guys has any tuning advise while I wait a few days for Justin to get back from me. Please PM. me for the datalog and I used a xcal 3 with live link.

Thanks for the help.... Dave

 

Did you return it to stock? If so did the sputter go away? If it did call Justin and tell him you want this fixed.

 

Cant return it to stock because it goes to the stock 5.4 n/a tune which is way ruff due to there is a lightning motor in the truck now.

 

Sounds like it will run ruff no matter what.

 

lose tb spacer for starters,looks like you will have to wait for justine

 

Ah forgot to ditch that from the n/a motor in my sig...thanks

 

It appears that the truck is not making the transition into open loop fueling. Don't get on it again until that is fixed. It is dangerously lean.

You should see a/fs in the 11.?? when you are on the gas.

 

Ok thanks any idea why it would not transition into open loop fueling?

 

I don't know. It is easy to see that there is a fuel problem from the datalog, but without the tune file it is not possible to see why.
Justin will sort it out.
In the mean time no wot.

 

Wow I guess no more datalogging until Justin fixes it but I am shocked that he would send me a tune like that. Could of done some damage to the motor. Why not start rich and work your way up to it? Only thing that is crappy now is that he wont get back to me for a few days. Oh well I will give you guys an update soon....thanks again!

 

after sending him 2 datalogs and him sending me 2 revised tunes after the initial one and told me if it still seemed lean(by sound and feel didnt have a a/f at the time) to add fuel through the fine tuning on the programmer, so i richened it up 4% i was still at 13.8 a/f had to richen it up another 6% to get it down to 13.1......my business will go elsewhere next time i want a new tune

 

Cant say as I blame you.

 

Great well that was the last of the money I had to finish the project so he had better fix this. It will be days of leaving messages and emails before I get a responce so my fingers are crossed.

 

Contrary to what has been posted in this thread, that file is actually going to open loop. I do start rich and with timing out, but due to the complexity of some swaps, you don't always know where they will start out.

David, as soon as i have an email back from you with the info I need I will send you an adjusted file.

 

Thanks Justin, This tune was better on fuel and makes me feel better and I cant wait for the next update!