Start with the in car video from Romain Dumas, who was the overall winner, using a Honda race engine and a chassis of his own design (Norma M20 RD Limited ). Do turn up the sound and use the video full screen. His time up the mountain was 8:51.445. By the way, Romain is a very, very competitive driver, and a week before he won Pikes Peak, he won the 24 hours of LeMans. He is a factory Porsche driver, born in France, currently living in Switzerland.
https://youtu.be/h-nON1H6I2wRhys Millen wasn't far behind with his electric "eO PP100" with a time of 8:57.118 about 5+ seconds back. It should not surprise you that three of the top five cars were EVs. See the overall results at:
http://www.ppihc.com/wp-content/uploads/2016-Overall-Results.pdf Rhys run (complete with a squealing brake noise) is at
https://www.youtube.com/watch?v=Fk7eCsWaLXw Again, full screen, sound up.