My car is currently being tuned and was hoping the experts on here could give me some insight. It is a Gen1 Coyote Crate motor with Ford Racing Control pack version A manual transmission. The car has been tuned NA for 7 years and has run flawlessly. I finally got around to adding a turbo I needed a new tune.
Issues my car was having with new tune.
-Stalling when coming to a stop
On Rev9 the tuner gave up and blamed my combo (which ran perfectly on previous tune with turbo installed and boost set at 0)
After he quit I figured out how to look at a DL myself and immediately noticed a MPH discrepancy. Logs showed my car at 0 mph until actually going 25mph and when at 7k rpm in 3rd showed 35mph in the log. Back in the early days of GEN 1 Coyote swaps stalling was a common issue. Ford Racing discovered it was the lack of a speed input so they would send you two pins to input speed to the ECM and the problem was solved. Knowing this but not wanting to ruffle feathers I asked the Tuner if the mph being off could be the cause of the stalling issue. The tuner quickly sent me a change so mph now matched. Lo and behold the car no longer stalled once mph was correct.
Now, I discovered this myself after Rev 9 and suspect all the changes that were made chasing issues were because of the MPH and are still in the current tune. I would expect that after the realization of the speed issue the tuner would have started over with a clean slate but I don't know exactly what would have been affected and if this would be necessary? I am wondering what changes may have been made, if they could be the cause of the current issue and what other areas would be affected.
The current issue is, after a cold start any throttle input around 1500-2000 rpm to normally accelerate results in lean popping and bucking. Timing goes below zero and STFT shows 35% fuel added with Lambda around 1.5. i.e. it's lean.
Thanks for any help.