Weekend schedule for VIR (Virginia International Raceway) August 21-23 2015 Oak Tree Grand Prix Event Schedule 21 Aug Practice 1 - Porsche GT3 Cup USA 08:00 AM - 08:30 AM ET Practice 1 - Lamborghini 08:45 AM - 09:25 AM ET Practice 1 - Continental Tire Challenge 09:40 AM - 10:25 AM ET Practice 1 - TUDOR Championship 11:45 AM - 12:45 PM ET Practice 2 - Porsche GT3 Cup USA 01:05 PM - 01:45 PM ET Practice 2 - Lamborghini 02:00 PM - 02:40 PM ET Practice 2 - Continental Tire Challenge 02:55 PM - 03:40 PM ET Practice 2 - TUDOR Championship 04:00 PM - 05:00 PM ET Qualifying - Porsche GT3 Cup USA 05:20 PM - 05:40 PM ET Qualifying - Continental Tire Challenge (ST) 05:55 PM - 06:10 PM ET Qualifying - Continental Tire Challenge (GS) 06:25 PM - 06:40 PM ET 22 Aug Qualifying - Lamborghini 08:00 AM - 08:30 AM ET Race 1 - Porsche GT3 Cup USA 08:50 AM - 09:35 AM ET Practice 3 - TUDOR Championship 09:55 AM - 10:55 AM ET Race 1 - Lamborghini 11:20 AM - 12:10 PM ET Race - Continental Tire Challenge 01:25 PM - 03:55 PM ET Qualifying - TUDOR Championship (GTD) 04:40 PM - 04:55 PM ET Qualifying - TUDOR Championship (GTLM) 05:05 PM - 05:20 PM ET Race 2 - Lamborghini 06:40 PM - 07:30 PM ET 23 Aug Warm Up - TUDOR Championship 08:35 AM - 08:55 AM ET Race 2 - Porsche GT3 Cup USA 09:20 AM - 10:05 AM ET Race 3 - Lamborghini 10:30 AM - 11:20 AM ET Race - Oak Tree Grand Prix at VIR 01:05 PM - 03:45 PM ET Race 3 - Porsche GT3 Cup USA 04:30 PM - 05:15 PM ET ...- See more at: http://www.imsa.com/races/virginia-international-raceway…