Beware of the Hollywood yuppies. They will steal your idea and you won't get a dime.
I would tell your friend to make it generic for all types of racing and patent it.
Even if you patent it a Hollywood type may take the idea and change it a little. Then they will market it themself.
The sport has been taken over by yuppies. People that don't even know how to change thier oil or spark plugs. But they know how to make money off of other people ideas. So watch out. Racing is a gold mine for that.
In the old days you would already have someone helping you market your product but not today because they do not want any competition.