I see the problem. The 3-lane
spreadsheet is setup for 3, 5, 6, 7 .. 15 cars. But not
4. I don't remember why 4 is
missing.
As a workaround, you could add "pace car" so you
have 5 cars. Maybe use one of last year's cars, or a car that a dad
built. But the agreement is the pace car can't win. It would be
skipped/ignored in the results.
Another option would be to use the 8-car
spreadsheet but put each racer in twice. This would be more
complicated to score.
Chris