Stepper Motor Spinning Slow

First thanks all, at the end I could drive it normally. Here is my code

var step = 0;
var steps = [0b0001,0b0011,0b0010,0b0110,0b0100,0b11­00,0b1000,0b1001];
var stepperPins = [E13,E11,E9,E7]; // Change these to pins for your motor driver
function doStep() {
 step++;
 digitalWrite(stepperPins, steps[step % steps.length]);
}

function stop(){
  digitalWrite(stepperPins[0],LOW);
  digitalWrite(stepperPins[1],LOW);
  digitalWrite(stepperPins[2],LOW);
  digitalWrite(stepperPins[3],LOW);
}

function go(f) {
  for (i=0;i<f;i++) {
    x=0;
    while (x<10) x++;//Delaying needed I don't know why.
    doStep();
  }
  stop();
}

Can you explain me please how much degrees does the motor moves for each doStep() call?
I think it must move 5.625° for each doStep() but it is not, may be it is 32 time less than 5.625°.

Also, I have tried both 5V and 9V , 9V has a great torque. 5V some times unable to start spinning, torque is not hight.