We have never tapped so I can't help you there, although I believe that this was discussed quite a while back on this forum. Look through the backlog of posts for info on this.
You also might find some info on high-nosed car designs as well. Easiest would be a wing or piece of wire shaped so that it contacts the starting pin as high up as you can. This has also been called a "Cheater bar", a term I do not like as it isn't cheating - it is just good strategy. We also have not done this as neither of my sons wanted to build a car with one. A high-nosed design will not help where there is a 'power-assisted' starting gate. They drop too fast for this to give an advantage.
At this year's Pack race, we did have a high-nosed car but it was not designed this way to give an advantage. It was "The Black Pearl" (a ship) from "Pirates of the Carribbean" movie. Hard to have a ship looking car without the high front end. Yes it did have sails but they were removed along with the masts for weigh-in and racing.