link to free air density tuning info for drag racing at NHRA Divisionals: Aug 9-11; NHRA Nationals: Aug 15-18;
Brainerd Raceway, Brainerd, MN; 1-866-444-4455. Map location, air density, density altitude, grains, forecast, historic, & metric data "for good spark plug readings":
https://airdensityonline.com/track-r...ional_Raceway/