Motor Control Code change axis system

Hi
I want to rebuild my printer so and don’t need to you belt drift any more and use m8 axis instead
so I wonder if this are that code to change the speed of X Y axis so it similar to Z

// default settings

#define DEFAULT_AXIS_STEPS_PER_UNIT {134.74,134.74,4266.66,200} //
#define DEFAULT_MAX_FEEDRATE {160, 160, 10, 10000} // (mm/sec)800
#define DEFAULT_MAX_ACCELERATION {9000,9000,100,10000} // X, Y, Z, E maximum start speed for accelerated moves. E default values are good for skeinforge 40+, for older versions raise them a lot.8000

#define DEFAULT_ACCELERATION 6000 // X, Y, Z and E max acceleration in mm/s^2 for printing moves
#define DEFAULT_RETRACT_ACCELERATION 6000 // X, Y, Z and E max acceleration in mm/s^2 for r retracts