link to free air density tuning info for IHRA 1/4 mile drag racing at US 131 Motorsports Park Summit Sportsman Spectacular Event, Martin, Mi, USA, July 12-14: map location, track elevation, air density, density altitude, grains, forecast, historic, & metric data for “good spark plug readings”:
https://airdensityonline.com/track-r...orsports_Park/