Jetting for Modena KZ Kart

Version 1.6 • Apple Watch, widgets and Live Activity: your main jet for right now on your wrist, on the lock screen and in the Dynamic Island throughout your track day. • Track mode: your jetting large and high contrast, to read it in full sun with your helmet on, with the conditions it is worked out from. And dark mode throughout. • Alerts when the weather changes enough to change the main jet: "Air density has dropped by 1.8 % since your last calculation". • Fuel: 98 E5, E10, E15, ethanol-free, CIK-FIA or race fuel, and the jetting is corrected for it. • Carburettor icing warning, using the criterion of civil aviation. • Fuel and oil mix calculator. • When you fetch the weather, the app detects the track you are at. 144 tracks in 22 countries, now including the United States. • Logbook synced through iCloud, and your jetting shared with your mechanic as a link or a QR code. • Location also works on iPad without GPS and indoors. • Report a problem and rate the app, from Results and from Help. IN EARLIER VERSIONS • 1.5: KK3 engine (2023-2025 homologation); setup logbook with ratings for low, mid and high; track database with the altitude of the track itself; the weather station inside Conditions; your jetting as an image card. • 1.4: KK1R calculation model adjusted after dyno testing.

The only Modena KZ app with the KK3. It works out the jetting for Modena kart engines with the Dell'Orto VHSH 30 carburettor, from the real temperature, humidity, pressure and altitude, and from the fuel you use. WHY THIS APP • The only Modena KZ app with the KK3 (2023-2025 homologation). • Apple Watch app, widgets and Live Activity: your main jet for right now on your wrist, on the lock screen and in the Dynamic Island. • Track mode: your jetting large and high contrast, to read it in full sun with your helmet on. • It alerts you when the weather changes enough to change the main jet, using the hourly forecast too. • It takes your fuel into account: E10, E15, ethanol-free, CIK-FIA or race fuel. • Carburettor icing warning, using the criterion of civil aviation. • 144 tracks in 22 countries with the altitude of the track itself, and it detects which one you are at. • A run logbook synced through iCloud, and your jetting shared with your mechanic as a link or a QR code, with no accounts. ENGINES KK1, KK1R, MKZ, KK2 and KK3. For KZ1, KZ2 and ICC karts. The KK3 is Modena's current flagship in KZ: it shares neither top end nor crankcase with the KK2, so it has its own jetting. RESULTS The recommended jetting for your conditions and your engine: main jet, emulsion tube, needle and clip, idle diffuser and idle jet, plus air density, density altitude and relative horsepower. Two ±10 % fine adjustments, high and mid, to match it to your engine. FUEL 98 E5, E10, E15, ethanol-free, CIK-FIA, leaded race fuel, race E10, oxygenated, or your own with its stoichiometric ratio and density. With E10 the main jet goes up by about 1 % compared with 98 E5. CARBURETTOR ICING From temperature, humidity and the chart civil aviation uses for carburettor engines, the app warns you when there is a risk at full throttle, and Conditions tells you whether there is one at idle and on the grid. TRACK MODE AND TRACK DAY Your jetting full screen at maximum brightness, how much the density has changed since what you fitted, the conditions and how old the data is. When you start a track day, for 12 hours the main jet is on the lock screen, in the Dynamic Island and on your Apple Watch, and the app keeps an eye on the weather for you. Dark mode throughout. CONDITIONS From the nearest weather station or typed in by hand; it works the same without coverage. If you are at a track in the list, the app detects it and asks you whether that is the one. ENGINE AND FUEL MIX Engine type, floats and their height, oil and track type. Fuel and oil calculator: choose what you want to know, the oil, the fuel or the ratio, and the answer is shown large, in litres, millilitres, US or UK gallons and ounces, as a percentage and as 1:n. LOGBOOK Each run with its conditions and its jetting, then what you actually fitted and how it went, lean, right or rich, in low, mid and high, with laps, best lap and maximum RPM. It syncs through iCloud across your devices and exports to CSV. TRACKS 144 tracks with their altitude, taken from the track itself rather than the town, which are usually different. Choosing one sets the altitude and the track type. Search by the track name or by the town. SHARING As an image card, as a link or as a QR code: your mechanic opens it in their app or, if they don't have it, in the browser. UNITS °C and °F, metres and feet, mb, hPa, mmHg and inHg.