i would still preload, just not go full throttle immediately when letting off the brake. start lower and ease into full throttle. an auto car doesnt need to worry as much about preloading though... your not dumping a clutch from higher rpm. You are either brake torque launching which is already full preloaded or doing your throttle mash which isnt going to shock the drivetrain like dropping a racing clutch. ultimately it doesnt sound like you dont need to worry about your drivetrain much at all since your 7AT, i dont really imagine anything breaking from occasional drag use.
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