Nitrous has been used both successfully and unsuccessfully at Reno. The failed attempts can lay blame at insufficient fuel added or unequal amounts of nitrous/ fuel to each cylinder. Nitrous has been used for seconds there to pass or gain an advantage at the home pylon as well as continuously or nearly so throughout the race, obviously in smaller amounts. 100LL has been successfully run at up to 75 inches manifold pressure with proper fuel and spark control, plus ADI. Superchargers clearly don't make the power turbos do at Reno but after looking at the difficulty in installing turbos on this Rocket, Bill opted for the supercharger. Again, I'll reiterate, ultimate power was not the goal here. The airplane is also being used for fun and cross country trips after the week of Reno is over. BTW, too rich AFR simply causes a rich misfire, no damage done usually on direct drive engines like this 540. I tuned the Gold championship winning, 750+HP Conti in the Venture in 2010- no wideband used... Most serious folks have data logging and some even have telemetry.