It is simple but needs saying... To catch a vehicle in front you Must be traveling faster than it. If you are both accelerating, you need to accelerate faster. If everything is equal it depends on retraction time and gear change speed. Fall behind 20 meters then apply the above rules.
Only hope for a gs to win a drag against another more powerful bike is to invoke three heathen god Visue. He will then smite them with wheel slin, or a sudden case of the runs...