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The shift defuel is what's others often call " Torque Management".
It's that function in the ECM that does not allow more than 20 Psi boost without wheelspeed detected and defuels during the shifts of the tranny ( Automatic!)
Now they call it " Torque Management" but in reality it's just a trigger of the torque management. The shift defuel ( sorry for the lack of a better term ) is the trigger that's pulled when you boost launch and you can't build more than 20 Psi without wheelspeed.
The " shift defuel " in " OFF " disables that trigger but the downside is ( for now, have to do more R&D) that the shift light indicator on the dash is turned off also. Maybe after all that's not a bad thing, remainds you that your tranny is on borrowed time... I would not use it for daily driving not even with a buit tranny.
If you have ears....listen!
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