Jetting for Rotax Max EVO Kart

The mix calculator, and a refreshed icon. • Mix calculator: converts between fuel, oil and ratio. You pick at the top which of the three you want to know — that one is shown in large type — and adjust the other two below, so the screen only ever has two controls and both are data. • Fuel and oil each have their own independent unit: litres, millilitres, US gallons, imperial gallons and US or imperial ounces. Changing the unit does not change the mix, only the number it is written with. • The ratio is shown both ways at once, as a percentage and as 1:n, because they are the same number seen from the other side: 4 % is 1:25. • It lives on the engine screen, right below the oil percentage, and one button leaves the ratio set in the jetting calculation. If you pick one outside the range the app calculates with, it tells you and offers the nearest, instead of trimming it without a word. • The minus and plus on each slider jump to the next round figure, so you can hit an exact value without fighting your finger. • The percentage is oil against fuel, not against the total mix: at 4 %, five litres of fuel take 200 ml of oil. The app says so on the screen itself, because it is the most common confusion of all. • The calculator has its own help, in all thirteen languages of the app. • Refreshed icon: the kart and the driver are the same as ever, the treatment is what changed. WHAT 2.4 BROUGHT, WHICH NEVER SHIPPED If you are coming from 2.3, this version also brings you all of this: • Track logbook: save every session with the circuit, the conditions, the jet you actually fitted, how it felt, the laps and the best time. Exports to CSV. • Auto calibration: with several sessions saved, the app spots whether your engine systematically asks for more or less than the recommendation, and offers to set it as your default fine tuning. • Micro MAX and Mini MAX are picked by specification, not by year. The MY20 kit can be retrofitted, so a 2018 engine that has been updated is MY20; up to 2.3 there was no way to tell the app, and it calculated it as pre-MY20 — nearly eleven jet points out. • The recommended jet shows both neighbours, in green when the choice is clear and in amber when the real value sits halfway between two. • Fine tuning works in steps of 0.5 and tells you what each step achieves, instead of moving an abstract number. • Oil type: XPS Castor, synthetic or something else, stored with your setup and in every logbook session. • Share the setup as an image, to send it to the team group. • Weather and GPS were the same task split across two screens: they are now a single Conditions screen, showing when the reading was taken and warning you if it is more than 30 minutes old. • The interface has been rebuilt: dark mode, system text size, VoiceOver, rotation and a proper iPad layout. • Six new languages: Catalan, Danish, Dutch, Norwegian, Swedish and Traditional Chinese. The app is now available in thirteen languages. Not one coefficient of the calculation has been touched in either version, and updating changes no result. What changes is that you can now tell the app your Micro or Mini has the MY20 kit. Oil type does not drive the calculation either, because what drives it is the percentage, not the base of the lubricant.