I know this is like my 2nd post, I spend most of my time here lurking and searching, this method usually works for me but man do I need some help!
I have been working on my tune for some time, but it seems like I get too far from what I started with and the car starts doing weird things. I finally decided to load a very early tune from my car and change only what I knew would need to be changed to suit the new cams and keep the timing where it makes power.
This proved to be the right idea and now my AFR at WOT is much improved as well as around town drive-ability. The main issue I have at the moment is the car wanting to nearly die as I roll to a stop. It does not die, but the RPM drops enough to dim my headlights and cause the car to surge sometimes.
The data log attached is taken right after I flashed the tune so I imagine there is some learning going on in the beginning, I'm not 100% sure how that part works. I say this because the STFT maxes out for a short while near the start of the log.
Any help or pointers would be amazing! I have an idea where to start with the idle as I coast to a stop, but I'm not sure how much to change or exactly which part of the dashpot to mess with.
Car is a 2008 Mustang GT 4.6
Mods:
127020 Comp Mutha Thumpr cams with phase limiters
BBK 62mm throttle body
IMRC delete plates
1 3/4 ceramic coated long-tube headers, no cats, 3" header back exhaust with straight thru mufflers
JLT Series III intake
-8AN fuel line from the pump to the rail with AEM 50-1000 320LPH pump and wiring upgrade
4.30 gears
Original manual trans swapped out for a 4R70W using the US Shift controller (not sure if this matters)
Tune up was done with the cams, HT1 plugs and new coil boots. o2 sensors are brand new Motorcraft replacement, the car is ALWAYS on 93 octane fuel.