SetVehicleVelocity()

if (IsPlayerInAnyVehicle(playerid) && GetPlayerState(playerid) == PLAYER_STATE_DRIVER)
{
        if(newkeys & KEY_FIRE)
        {
             if(EnableBoast[playerid] == 1)
             {
                  new Float:vx,Float:vy,Float:vz;
                  if(getPlayerSpeed(playerid) > 400)return 1;
                  GetVehicleVelocity(GetPlayerVehicleID(playerid),vx,vy,vz);
                  SetVehicleVelocity(GetPlayerVehicleID(playerid), vx * 1.8, vy *1.8, vz * 1.8);

             }
        }
}
stock getPlayerSpeed(playerid)
{
	new Float:x, Float:y, Float:z, Float:rtn;
	if(IsPlayerInAnyVehicle(playerid))
	{
	    GetVehicleVelocity(GetPlayerVehicleID(playerid), x, y, z);
 	}
 	else
 	{
		GetPlayerVelocity(playerid, x, y, z);
 	}
 	rtn = floatsqroot(x*x + y*y + z*z);
	return floatround(rtn * 100 * 1.61);
}