PerfExpert - Car Onboard Dyno

791 reviews
Content rating
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About this app

Embark the efficiency of a true dyno inside your car!

Measure your real engine power and torque within 2% 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 allows 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 PerfExpert community:
- Facebook:
- Google+ :
- Support :

- 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

- Compatible with most tablets (GalaxyTab 10.1, 8.9, Nexus 7, Nexus 10 ...) and high-resolution screen phone (Nexus 4, Nexus 5, Nexus 5X, Galaxy S3/S4/S5/S6/Edge, Galaxy Note, Galaxy Nexus, HTC One X, LG G2...)
Updated on
Jul 14, 2020

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Location, Personal info and 4 others
Data is encrypted in transit
You can request that data be deleted
791 reviews
Brian Neimoyer
May 23, 2020
Had high hope for this app. It is very detailed and the configuration for you car is very technical and specific which I like alot. After I went through the calibration and car set up I could not dyno my car even on a smooth road because my sport springs are to stiff and the app gives an error message because of this. I will not change my race suspension for this to work properly. I will request a refund. It is a good app for a Lincoln Town Car.
4 people found this review helpful
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May 31, 2020
Hi Brian, PerfExpert is compatible with very race car stiff suspensions. From what you wrote, we would say that you tried to start the test while the car was still rolling. Before pressing the START button to initiate a test, you should make sure you stopped completely the car, please check the tutorial :
Dawid Harasim (TDI-Dave)
June 15, 2020
It's simple. Calibration may take couple tries if you do it wrong. I guess calibration pictures in the app could benefit from written words what's up and down, front and back. One of the pictures can be a bit of a guess. After that? You put the data, ACCURATELY. Stop the car, have the phone secure at acceptable position. Which is easiest thing in the world to do. You get green light, you drive. And results shown are very accurate, I've tested it on plenty of cars. Great app.
13 people found this review helpful
Did you find this helpful?
June 27, 2020
Thank you for your great feedback!
A Google user
October 6, 2018
Tried several times and just can't get it to complete a session. There's allot of good features, and it should be quite accurate, but with the calibration taking a good 4 or 5 tries to complete, and the barrage of steps you have to go through before you can start a logging run (most of which can and should be automated) When you finally get to test it. You get successive error messages, phone in bad position, or phone at wrong angle, or travels distance less than 18m I've tried several times in multiple positions, and watched all the tutorials, but it's just too temperamental. It could be so good, but with the gauge error messages you get, I don't know how it wants to be positioned or what's wrong. Of a good 6 or 7 times testing on the asphalt, I've had 0 success in even getting it complete 1 run. It could be good, but it is just too temperamental, and too long winded to use.
17 people found this review helpful
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February 4, 2019
Hi, calibration of the device sensors is a mandatory step to get reliable results, we can't do another way. But we understand that we must improve the calibration process. For the measurement process, all instructions are available in-app, it's very simple. Also we invite you to check our new dyno tutorial :

What's new

Fixed weather data retrieving.