PerfExpert - Car Onboard Dyno

In-app purchases
810 reviews
Content rating
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image

About this app

Unlock the true potential of your car with PerfExpert!

Measure engine power, torque, and acceleration accurately within 2% using just your smartphone.

Say goodbye to expensive dyno tests and get objective, independent results instantly.

★ ★ ★ ★ ★

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 vehicle's specifications, including curb weight, tire sizes, and engine displacement. If you're unsure about these details, we'll guide you through the process.
2. Mount your phone in your car => No need for complicated connections. Simply secure your phone in the car, and PerfExpert will utilize its internal sensors to measure accurate acceleration.
3. Accelerate through the entire engine rev range => Choose a flat, straight, and horizontal road. Accelerate from low revs to the maximum revs while maintaining the same gear. It's that simple!

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 PerfExpert Users community on Facebook:

***** Features *****

- 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, PNG and as a web link on the PerfExpert Network

- Compatible with most tablets (Galaxy Tab, Nexus...) and high-resolution screen phone (Galaxy, Redmi Note, Pixel, Nexus...)
Updated on
Jul 2, 2023

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

Ratings and reviews

792 reviews
Steven Hickerson
September 4, 2023
Wildly inconsistent and inaccurate results. Hp values jump around 120 hp doing a pass at the spot under the same conditions. Phone is very secure and calibrated. All car settings completed correctly. Simply not trustworthy even as a relative gains because it's so inconsistent. EDIT: yeah you are FOR SURE wrong. All instructions were carefully followed to the t. Typical greedy behavior, won't admit flaws, probably why you don't offer a trial version of the app. You know no one will buy it then.
1 person found this review helpful
Did you find this helpful?
September 4, 2023
We invite you to follow the in-app dyno tutorial instructions carefully to obtain consistent and reliable results, within 2% margin. If you got inconsistent results while performing tests in the same conditions (same road portion, same direction), this means FOR SURE you did NOT follow the procedure properly. This has been demonstrated many times.
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.
5 people found this review helpful
Did you find this helpful?
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 :
April 27, 2023
Nope! After paying for the app and requesting customer support (twice which never materialized), I finally was able to download the app. I carefully followed calibration instructions, put in the gear ratios, vehicle weight including passengers, fuel level and "cargo", weather conditions, etc. Estimated 3rd and 4th gear Torque #'s were way off (much too high) for my stock BMW M240iX. Pushing to red line in higher gears should only be attempted on a closed course and there aren't any in my area.
Did you find this helpful?
April 28, 2023
Hi, we do our best to reply to all customer support requests and we have no track of yours: no pending request from any BMW owner. It's not necessary to perform the test in higher gear than 4th gear. When torque is too high, this is often due to S-Tronic kick-down triggered. Please contact us at so we can help you.

What's new

This update fixes some bugs introduced in the previous release:
- You can now add new setups
- The infinite loading of car profiles in the home screen is solved