Version 2.4 • Track mode: with weather station data, while it is open it checks the station again every 15 minutes. The density no longer freezes just because the screen stays on. • Temperature, pressure, humidity and altitude in track mode and in the track day on the lock screen, so you can see where the density change comes from. • E15 fuel. In the United States, each fuel with its octane: octane rating does not change the jetting; ethanol does. • "Sync with iCloud" in plain sight in the Logbook, and changes from your other devices arrive without opening the app. • Conditions typed in by hand are no longer replaced by the station's when you return to the app. IN EARLIER VERSIONS • 2.3: Apple Watch app, widgets and Live Activity; track mode and dark mode; alerts when the weather changes; fuel in the calculation; carburettor icing warning; track detection; logbook synced through iCloud and your jetting shared with your mechanic. • 2.2: fuel and oil mix calculator. • 2.1: 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. • 2.0: TM KZ-R2 (CIK-FIA 2023 homologation) and KZ-R3 (2026) engines.

Version 2.3 • 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. 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, ethanol-free, CIK-FIA or race fuel, and the jetting is corrected for it. • Carburettor icing warning, using the criterion of civil aviation. • When you fetch the weather, the app detects the track you are at. 144 tracks, 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. IN EARLIER VERSIONS • 2.2: fuel and oil mix calculator. • 2.1: 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. • 2.0: TM KZ-R2 (CIK-FIA 2023 homologation) and KZ-R3 (2026) engines.

Version 2.2 FUEL MIX CALCULATOR • New. You choose what to work out — the oil, the fuel or the ratio — set the other two with your finger, and the answer is shown large. • In litres, millilitres, US and UK gallons and fluid ounces, with the ratio shown as a percentage and as 1:n at once. • One button sets it in Engine, and from there it goes into the calculation. SETUP LOGBOOK • A new tab. Save every run with its conditions and the recommended jetting, then note what you actually fitted. • The rating is given separately for low, mid and high: a setup can be lean at the top and rich at the bottom at the same time, and each is corrected with a different part. • Laps, best lap and maximum RPM too, so you can compare two runs. • Export to CSV, backup, and import from another phone. CONDITIONS • GPS is no longer a separate tab: querying the weather station now sits at the top of Conditions, next to the values you type in. They were two screens for the same job. TRACKS • 112 KZ tracks with their altitude, taken from the track itself rather than the town. Picking one fills in the altitude and the track type. Search by the track name or by the town. SHARING • Jetting can be shared as an image card, with the track and the date. ALSO • A new option to report a problem from the help screen, with your app details already filled in and shown before you send them. • The help has been rewritten from scratch. • New launch screen. • Fixes a display problem on the first screen.

Version 2.1 SETUP LOGBOOK • A new tab. Save every run with its conditions and the recommended jetting, then note what you actually fitted. • The rating is given separately for low, mid and high: a setup can be lean at the top and rich at the bottom at the same time, and each is corrected with a different part. • Laps, best lap and maximum RPM too, so you can compare two runs. • Export to CSV, backup, and import from another phone. CONDITIONS • GPS is no longer a separate tab: querying the weather station now sits at the top of Conditions, next to the values you type in. They were two screens for the same job. TRACKS • 112 KZ tracks with their altitude, taken from the track itself rather than the town. Picking one fills in the altitude and the track type. Search by the track name or by the town. SHARING • Jetting can be shared as an image card, with the track and the date. ALSO • A new option to report a problem from the help screen, with your app details already filled in and shown before you send them. • The help has been rewritten from scratch. • New launch screen.

Version 2.0 New engines • TM KZ-R2, CIK-FIA 2023 homologation, with its own jetting correction. • TM KZ-R3, CIK-FIA 2026 homologation. Its changes are to the clutch and primary ratio, so it shares jetting with the KZ-R2. • The KZ-R2 is now the engine selected by default. Fixes • The GPS tab works again. On recent iOS versions it never got a position and always ended in an error. Interface • Fits today's iPhone and iPad screens: no more right-hand margin and no more clipped values. • The help screen is native and respects the system text size. Under the hood • Removed the obsolete components that were blocking updates. • The app no longer sends any usage data to third parties.

Improved service for obtaining weather information. Minor changes in user interface. Performance optimizations.

Added new KZ-R1 engines. Fixes some minor user interface bugs.

Added new KZ-R1 engines. Fixes some minor user interface bugs.

Added new KZ-R1 engines.

Changes in texts and images

Added KZ10C engine

Includes KZ10C engine. Improved service for obtaining weather information. Minor changes in user interface.

Adjusts the calculations for configurations 1 and 3 (enriches the mixture) Fixed display bug and network access error in iOS9.

Fixed issue in GPS functionality.

Bug fixes. New icon & images.

Solved bugs in iOS 8 Density altitude and relative horsepower are calculated and shown in the first screen.

Modified setup 1 to enrich the main jet. Solved bug in engine type selection. Modified default float height to 11mm.