99 C2500 5.7L Vortec Long Tube Headers

[computerfriedbrains]

Hey, guys! I'm sure this has been asked a million and a half times, but I searched the Repository, and didn't find anything. I was just wondering what a good base would be after installing LTH. Or, if there isn't one, where should I start on the base tune to begin tuning for the LTH? Any help would be greatly appreciated!!! TIA!!!

[5FDP]

Start with the stock file or what you've already created, that is your base.

If the converters can been removed, then do what you need to for turning off cat over temp and the rear o2 codes.

Stick a wideband oxygen sensor in the exhaust and start tuning. Dial in the air fuel ratio's first and then work on engine timing to see if it helps any.

[computerfriedbrains]

Start with the stock file or what you've already created, that is your base.

If the converters can been removed, then do what you need to for turning off cat over temp and the rear o2 codes.

Stick a wideband oxygen sensor in the exhaust and start tuning. Dial in the air fuel ratio's first and then work on engine timing to see if it helps any.

I have turned off the post cats. I also adjusted Stoich too. The tune file has what I've done so far, and the log is from my attempt at fixing my CEL for the cam correlation. (I just had a new engine put in.)