Increasing the speed of a stepper motor using the A4988 and

Support Motor controllers/drivers and motors
3

Hello Ben. Thanks for responding. The speed of rotation and to have around 120 RPM. I do not know how much until I increase, however would like more, something in 1000 or 2000 RPM. I know that when I lose the speed increase torque, but has no problem because the torque does not interest me. Already tried setting the MS1, MS2 and MS3 according to the table on page 6 of the A4988 datasheet, already made ​​several modifications in the arduino code shown below, already used a font adjustable to provide a higher voltage, but not getting success. I am currently using a source of 12V, 3A.
–Link to the stepper motorhttp://www.robocore.net/modules.php?name=GR_LojaVirtual&prod=362
–Code of arduino

void setup() 
{ 
  pinMode(9, OUTPUT);       // Motor Dir
  pinMode(10, OUTPUT);     // Motor Step
  }
void loop() 
{
  Pololu_A4988_Example();
}

void Pololu_A4988_Example()
{  
  delay(500);   // delay for Controller startup
  digitalWrite(9, HIGH);     // Turn left
  for(double i = 0; i < 5000; i++)  //5000 steps in one direction
  {   
    digitalWrite(10, HIGH);
    delay(1);
    digitalWrite(10, LOW);
    delay(1);
  } 
  delay(500);   // delay for Controller startup
  digitalWrite(9, LOW);     // Turn left
  for(double i = 0; i < 5000; i++)  //5000 steps in one direction
  {   
    digitalWrite(10, HIGH);
    delay(1);
    digitalWrite(10, LOW);
    delay(1);
  } 
  delay(1000);
}