Fox + Son Jetmax vs Mychron Telemetry

Precision jetting made easy — This app helps you calculate jetting for Rotax engines based on weather and altitude. Now every Rotax racer has access to the same jetting Fox + Son has used to power our engines to countless Rotax National wins and Grand Finals tickets. After many months of development and testing, we have successfully brought the same jetting algorithms we use on our dyno to a quick, easy-to-use app. We have also included all of our popular Rotax tuning tips that are found on our website, along with a handy interactive gear chart for your convenience. As we do with our website, we will continually update the app as we discover new tuning information. Anytime a new cylinder or part is introduced, all of the testing we do at the shop will flow directly to Jetmax. Jetmax will also calculate the relative horsepower for that atmospheric condition. The relative horsepower percentage is helpful information to have when selecting your gear ratio. In certain situations you can benefit from increasing your gear ratio when HP is low & decreasing your gear ratio when HP is high. Whether you're competing at the track or fine-tuning your kart for practice, Jetmax gives you accurate, reliable recommendations so you can focus on performance. Features: - Jetting calculator for Rotax engines - Calculates relative horsepower - Includes an interactive gearing chart Engineered by racers, for racers — Fox + Son Jetmax App delivers the tools you need to stay competitive on race day. *You must have a valid subscription in order to use this app.

Mychron Telemetry turns your phone into a lap timer and racing companion for karting, track days, and closed-circuit sessions—without a steep learning curve. Start a session in seconds, let GPS detect your start/finish, and focus on driving while the app counts laps, tracks your best time, and shows a clear delta against your session best. Why drivers choose it • Fast setup: One tap to begin; optional track sketch on the map when you need a defined circuit. • Automatic lap timing: Crossing the line starts the clock; your lap list, best lap, and sectors stay organized. • Live session view: Follow current lap, best lap, speed context, and a simple track map while you’re on track. • Leaderboards: Compare yourself on saved tracks with filters for kart, car, and bike—daily, weekly, or overall. • Progressive depth: Start with pure lap times and rankings; grow into comparisons and insights as you improve. Who it’s for Weekend karters, track-day enthusiasts, riders on technical circuits, and anyone who wants consistent lap data without carrying extra hardware first. Privacy & data Designed so your sessions stay useful to you first—share when you want, keep detail when you don’t. Requirements GPS works best with a clear view of the sky. Lap accuracy depends on GPS quality and how precisely your start/finish is defined. Download Mychron Telemetry, hit start, and turn every outing into measurable progress.