[SixCyl]

Originally Posted by hapisok

i had blacked out tips with my trifecta tune as well. the AFR you see, should generally be set for 14.7:1 during cruising and only drop between 12-13's during WOT.

a rich condition is what causes the excess build up of carbon on the tips. it is from fuel that has not completed the combustion process. in conjunction with the amount of oil that the LLT consumes...good luck avoiding it. if you look, you will notice the stock camaro trashcans that hang below the bumper drain out carbon buildup through a weep hole (or something like that) which causes the black stripe on the bottom side. like was mentioned earlier, they come that way (rich/safe) from the factory.

the more you get into the peddle and go WOT, the quicker carbon will build up. not achieving complete combustion could also be an indication of timing being off, even with a richer AFR. just something to think about.

Ashley from BNR told me that soot buildup was normal after a tune, I just couldn't believe the buildup occurred in one day with no heavy driving. That didn't seem right to me. I'll have to see how I'm doing now, haven't cleaned my tips again.

Either way, it's not the buildup that bothered me it was my mpg. I went from 18-20 (21 if I really really tried) depending on driving habit to 16.5 doing my absolute best to granny it, coast to a red light, etc. Right now my car says 20.8 and I haven't really gone hard on the throttle yet so I suspect around 19-20 with normal driving habits.

Oh, I'm on my laptop so I attached the original data log for a pre and post tune neighborhood lap and an excel version if someone wants to stare at a million numbers.

Edit: upload files invalid, so I did a print screen. Let me know if I'm using the right log function.