# Rotax Jet Tune > Automated kart engine jetting based on local weather conditions. (iPhone/iPad app by Lachlan Taylor.) - Source: https://appshunter.io/ios/app/rotax-jet-tune/id645197187 (this page in markdown: same URL + `.md`) - Developer: [Lachlan Taylor](https://appshunter.io/developer/645197310) - Category: Sports, Lifestyle - Price: $1.99 - Rating: 4.00/5 from 2 App Store ratings · 4 written reviews indexed - Age rating: 4+ - Requires: iOS 6.0 · 1 MB - Languages: American English - Released: 2013-05-26 - Data updated: 2026-08-25 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/rotax-jet-tune/id645197187/reviews.md ## What is Rotax Jet Tune? Rotax Jet Tune makes jetting your kart engine to the weather conditions easy. This one click application automatically retrieves the current local weather conditions from the nearest weather station and quickly informs you of the best jet to use at that time. Often between races is a hectic busy time getting ready for the next race or worse, fixing mechanical problems. Rotax Jet Tune takes the hassle out of jetting your Kart quickly and easily so that you can focus your attention on other things in preparation for the next heat/race. Using the data from the familiar Rotax Jetting chart, the apps provides the most accurate jetting setting for your engine. The app has many great features including the ability to fine tune the calculations to you particular engine using the TRIM function, thus allowing the perfect jet everytime. Rotax Jet Tune Features include: - Retrieval of current weather conditions from nearest weather station - Calculation of the best jet for the conditions based on the Rotax Jetting Chart formulas. - Granular Single digit jet numbers given - even more accurate than the Rotax Jet Chart. - Absolute Pressure and Air Density Calculations based on altitude for greater accuracy - Customisable display values: - Celsius or Fahrenheit - Hpa or inHG - Metres or Feet - TRIM function allowing fine tuning of the app to your particular engine. - Own weather data can be used if you have your own weather station Rotax Jet Tune is the easiest way to Jet your Kart engine. PLEASE NOTE: This product is for traditional Rotax 125 engines only and is not compatible with the new Rotax EVO engines. Once further information is provided by Rotax of the new EVO engines, an updated version will be forthcoming. ## Key features - Automatic weather data retrieval - Optimal jet calculation - Rotax Jetting Chart formulas - Absolute pressure and air density calculations - Customizable display values - TRIM function for fine-tuning - Use own weather data ## Recent user reviews (4 of 4) All indexed reviews: https://appshunter.io/ios/app/rotax-jet-tune/id645197187/reviews.md ### 1/5 — No location *2015-07-06* This app fails to get the current location. I have turned on the location services to always allow. This turns off when you open the app. Not happy wouldn't recommend this one. ### 4/5 — Good, simple app! *2014-12-22* Seems pretty accurate, may have to adjust trim slightly. Would like to see a needle clip position as well. ### 4/5 — Working fine - wish it included needle settings *2014-07-19* I've been using this app for a while now over the course of a few track sessions, and it seems to be working correctly - the suggested jet settings all seems reasonable and have worked well for me. My only suggestion would be the addition of needle clip settings - I'm never sure when to move the clip from 2 to 3 or 4. Other than that well worth the purchase. Thanks! ### 5/5 — Good little app! *2013-06-13* Does exactly as it says on the can. Has so far worked perfectly giving me the right jet each time. Going to start to trim to my engine next. ## Frequently asked questions about Rotax Jet Tune ### What is Rotax Jet Tune? Rotax Jet Tune is a paid application designed to help kart racers automatically determine the best engine jetting based on current local weather conditions. It uses formulas from the Rotax Jetting Chart for accurate calculations. ### How does Rotax Jet Tune calculate jet settings? The app automatically retrieves local weather data from the nearest weather station and uses this information, along with altitude, to calculate absolute pressure and air density. These factors are then used with Rotax Jetting Chart formulas to determine the optimal jet. ### Can I customize the settings in Rotax Jet Tune? Yes, Rotax Jet Tune offers a TRIM function to fine-tune calculations for your specific engine. You can also customize display values for temperature (Celsius/Fahrenheit) and pressure (Hpa/inHG). ### Does Rotax Jet Tune have ads? No, Rotax Jet Tune does not contain advertisements. It is a paid application that provides an ad-free experience for users. ### What devices does Rotax Jet Tune support? Rotax Jet Tune is available for iPhone and iPod devices. It was last updated on July 8, 2015, with version 1.2. ### What is the price of Rotax Jet Tune? Rotax Jet Tune is a paid application, priced at $1.99. There are no in-app purchases or subscription fees associated with its use. ### How accurate are the jet numbers provided by Rotax Jet Tune? The app provides granular single-digit jet numbers, which are stated to be even more accurate than the standard Rotax Jet Chart. The TRIM function further enhances accuracy by allowing fine-tuning to your particular engine. ### What is the age rating for Rotax Jet Tune? Rotax Jet Tune has an age rating of 4+, making it suitable for a wide range of users. The app was first released on May 26, 2013. ## Version history (last 3 releases) ### 1.2 — 2015-07-08 This update from Apple will improve the functionality of this app. No new features are included. Bug fixes ### 1.1 — 2015-06-29 Updated terms and conditions and bug fixes. ### 1.0 — 2013-05-10 No release notes. ## Related topics [ignite rotary](https://appshunter.io/ios/topics/ignite-rotary) · [jettison](https://appshunter.io/ios/topics/jettison) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*