Link to free air density tuning info for drag racing at NHRA drag racing:
Texas Motorplex, Oct 16-20, Ennis (Dallas), Texas, 972-878-2641
Map location, air density, density altitude, grains, forecast, historic, & metric data "for good spark plug readings":
https://airdensityonline.com/track-r...xas_Motorplex/
https://airdensityonline.com/track-r...otor_Speedway/
forecast:
https://airdensityonline.com/track-f...xas_Motorplex/
historical (you can go back several years):
https://airdensityonline.com/track-h...ex/2019-10-14/
current metric:
https://airdensityonline.com/track-r...xas_Motorplex/
racingjunk article:
https://www.racingjunk.com/news/2019...all-nationals/