Ride along with Tom Kristensen as he pilots the Audi R18 E-Tron Quattro for a night time qualifying lap for this year’s 24 hours of Le Mans. Two things of note: first is how crazy fast he’s going. Imagine having to concentrate hard enough to maintain that pace for hours at a time. Second, you can clearly hear the electric motors wind down the front wheel speed in the heavy braking zones. That energy is then stored by spinning up a magnetic flywheel that sits in the passenger seart. It’s the same system that Porsche has been running in their 911 GT3 RS Hybrid endurance car with a couple of upgrades. The flywheel housing is now carbon fiber to save weight. The housing’s job is to hold a vacuum so the flywheels can spin without air resistance which would have been significant at 40,000 rpm. The car in the video qualified fourth overall, but the other E-Tron Quattro was the first ever hybrid to take pole at Le Mans.