That sounds about perfect for a throttle servo. Most pro's use Aritronics 737 servos for gas truck throttle at .15 sec and around 70oz of torque. The little slower reaction on the throttle helps keep the motor controlable. Super fast servo's do nothing for gas trucks as the engine has a hard time reacting to very quick inputs. Also if the break is setup right you do not need a lot of power to lock up the breaks on a 2wd car.
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