Hi, we had 2 6R80 tranys at a Transmission builder.
Hardware as to my knowlege:
Higher friction clutchpacks (non Exedy stage2)
Billet intermidate shaft.
Plus he did some, with his words "secret job" to the valve body and maybe different valves.
Logged the car with a stock 2017 Mustang Auto calibration.
trying to level up and down the shift pressure for 1-2nd did not help.
Increasing the clutch Filltimes seems to help a bit, but still way from satisfying.
I see a spike to 39psi when Sol. C kicks in before it then goes to the 79psi.
I assume this is the harshness in the shift, but dont know how to remedy this.
Attached are two logs with shiftpressure up and down testing on the oncoming (ECM41110),
but seems to make no difference.
Layout I am using: 6R80TrannyBuildLayout.Layout.xml
1st2nd_1A2M_pressX1,5.hpl
1st2nd_1A2M_pressX0,75.hpl