fsx aircraft takeoff speed

I have an airbus a340-300 in my fsx, but the problem is that the minimum speed for vrotate is lmost 230 KNOTS!!!!! and the runway is not long enough for the aircraft to takeoff.

I compared with another a340 that I had but that one was ok in the vrotate speed (about 160 knots)

I tried to change the aircraft.cfg code but I dont know how.

Need some help please