Next time at a spot, if you want to run for money, put an envelope under a wiper (or where they should be). Many just come to watch anyways.

Those looking to race will recognize it and ask if you want to run from a roll or a dig -- the other person gets to choose approximate distance to run. Anything you got you can run with (nitrous, turbo, supercharger, naturally aspirated, etc) and the opponent (and not his friends) may look under the hood.

Once this has been agreed upon, put some money into the envelope and give to a 3rd party to hold. The 3rd party person rolls behind and signals when to go with a high beam flash (no count) to make it fair and prevent someone jumping early. There must be a definite ending point along the roadway as a finish line so there is no argument.

Sound good?