Embark the efficiency of a true dyno inside your car!

Measure your real engine power and torque within a 2% margin by performing a simple acceleration with your car!

Make sure your tunings are effective using a completely objective and independent way, without any excessive expense!


PerfExpert - Car Onboard Dyno & Timer is an application allowing you to measure the performances of your car, such as its real power, torque, and acceleration times. It doesn’t require any connection to your car. Results are provided as detailed reports featuring interactive charts.

How does PerfExpert dyno works ? It's simple :
1. Create your car profile => Describe your car to PerfExpert by providing information such as curb weight, tire sizes or engine displacement. If you don't know how to find your car's specifications, we help you to do so.
2. Mount your phone in your car => No need to connect your phone to your car. With your phone firmly mounted inside your car, PerfExpert can rely on its internal sensors to measure the real acceleration of your car.
3. Accelerate through the entire engine rev range => On a flat, straight and horizontal road, perform an acceleration from low rev to the maximum rev, keeping the same gear : that's it!

IMPORTANT : dyno test is not compatible with automatic gearboxes that doesn't have a manual mode.

With such a tool, you can check the efficiency of your various tunings, ECU mapping, chiptuning, and even your chassis settings.

Using the specification of the tested car and your device’s accelerometer, the application runs our algorithms and dynamic power loss calculations to provide the performances of your car with high accuracy.

Skeptical? Here is a selection of comparison tests between “PerfExpert - Car Onboard Dyno” and real chassis dynos, performed by some of our users :

For further information, you can find our FAQ at

Here are sample dyno and timed run reports created using the application :

Join now the growing PerfExpert community:
- Facebook:
- Google+ :

- Dyno test : measure the power and torque of your engine with advanced loss calculation model. Detection of the engine rev limiter. Detailed reports featuring interactive charts of wheel and engine horsepower and torque / engine speed, just like a regular chassis dynamometer.

- Compute corrected power and torque using the correction norm of your choice (atmospheric pressure, ambient temperature and air humidity are taken into account). Available standards: DIN (Europe), SAE (America), JIS (Japan), CEE (Europe) and ISO (International).

- Timed Run test to measure your 0-60mph, 0-60ft, 0-1/8mi, 0-1/4mi, 0-100km/h, 0-20m, 0-200m, 0-400m, and much more.

- Use of your phone accelerometer at its maximum frequency and advanced signal processing for smoothed curves.

- Custom choice of units from a large choice: Hp, Ch, Cv, Kw, Nm, Ft.Lb, mKg, Mph, Km/h, m, ft, G, m/s², psi, inHg, mBar, °C, °F

- Export reports in Tab Separated Value format and PNG

What's New

Version 2.1.1

- Fixed the calibration screen guide and countdown wasn't appearing on some devices.

- User interface improvements to manage iPhone 6 screens and above
- Fixed Dyno and Timed Run graphs smoothing levels that was slightly too high due to a previous modification of measurement algorithm : this will cause little changes on some of your existing results.
- Fixed the car avatar crop feature
- Fixed the web link sharing for Timed Run results

Customer Reviews

Great car performance information


I wasn't ready to go spend hundreds of dollars on a Dyno run. So I went looking for a Dyno for my iPhone and I came across a PerfExpert.

PerfExpert was the first performance app I tried. Their website has the information that was not included in the app for how to set it up and make it work. It works so well for me that I didn't even go look for any other dynamometer apps.

I recommend this app for anyone that's interested.

Developer Response

Thanks for your feedback. We have included many documentation inside the app, that are accessible via the top right 'help' button of most app screen. Can you contact us to tell us which information of the website helped you to set up the app and that should be included in it? Thanks.
Feel free to join our community to interact with other users, share your results, ask us questions and send us your suggestions :

Pretty impressed!


I can plug the info that this app gave me into a 1/4 mile calculator, and the trap speed (which is the more accurate way to calculate power) is only off by 2.5mph from what my car actually ran at the track. I'm impressed! You need two things, a phone with a good g sensor, and you have to be able to plug in all the info the app asks for. The less accurate your car statistics are, the less accurate this app will be.
Happy I spent the money.


Lp schools III

I have contacted the creator numerous times and he has helped me everytime!!
I recommend this app. With the instruction and information on the forum you can see muy progress that can very well help you. The creator is very responsive just as the app. Thanks!


42.4 MB
Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, French, Italian, Portuguese
Age Rating
Rated 4+
© 2017 PerfExpert SAS


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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