I'm not sure whether this topic has been discussed and resolved before, but it definitely baffles me quite a lot for some time. As the title says, IXEG 737 taxis too fast when on ground even though the throttle is at idle. If I just let the aircraft go without braking quite a lot, the taxi speed could easily exceed 20, it just keeps going up and up. I need to brake when trying slow the speed. By the way, I don't have any flying equipment , just mouse and keyboard. All I hope to do is control the speed on ground. But it usually goes like this, Ground speed goes up to 20or more when I loose the brake. I believe when the throttle is at idle, the aircraft should stay where it is. When I push the throttle lever a little bit forward, the aircraft move forward. That should be logical and reasonable.