Having attended both F1 and IMSA races, I found some distinct differences, and you might be surprised at what I discovered.

Courtesy of IMSA The International Motor Sports Association ... the class in which Acura, BMW, Cadillac, Lamborghini and Porsche currently compete. Aston Martin will join midway through this ...

IMSA “Win the Weekend” presented by Michelin is back for its third season. Episode 1 of season 3 is now available to stream ...

See, in both IMSA and WEC, Cadillac is the only manufacturer that opted to mate a V8 combustion engine to its hybrid powertrain. Everyone else opted for smaller engines — but it was critical ...

Then, Cadillac has to prove it can beat them. The Cadillac V-Series.R, the LMDh machine competing in both IMSA and WEC, is the first step in that direction. With wins at races like Long Beach ...

The first 60 minutes and last two hours will air on NBC. USA, IMSA.TV and YouTube will share the middle portions. After that, IMSA, NASCAR’s sports-car cousin, will hibernate for six weeks.

Those opportunities are part of the rising tide created by the convergence of hybrid prototype rules between IMSA and the World Endurance Championship. Earl Bamber, who will compete in a Cadillac ...