AFC cap ?
 

if i was to play with the smoke screw or whatever you want to call it ... do I have to take the AFC cap off , or can I just do it without removing anything besides the cap that covers the torx screw

Remove the cap with a sharp object carefully, like with a knife, stainless preferably, a big one with a sharp tip or a pick and hook set, the cap is made out of tin and is easily punctured and there is a locking nut with a torx screw in the middle. Adjust as desired. Retighten locking nut carefully. :rock:

okay , i accidently destroyed my cap lol ( is it a big deal ? ) ... and do i have to take the nut off then adjust it or just loosen the nut ?

Just loosen the nut and adjust the screw then tighten the nut back up but don't go crazy with it unless you have gauges because this can make your EGTs go up pretty fast. Oh and pay close attention to how far you turn the screw so if you don't like the results you'll know how to get it back to the original depth

okay , thanks !
I was worried about a (runaway) engine because of this mod , but i guess it is unlikely....
do you think that half a turn would do the trick ?....and what are EGT's?

I did mine a half turn and liked the results but I stopped at that till I get my gauges ordered and installed. I also turned my stock fuel pin and adjusted my star wheel a little.

so half a turn was noticeable without playing with the other stuff ?

I did the fuel screw after the other stuff. And it took some fine tuning. Get on YouTube and watch "how to tune VE cummins" or something like that, helped me a lot!