
PerfExpert 17+
Dyno and acceleration test
Claude JOSEPH ANGELIQUE
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- $12.99
- Offers In-App Purchases
Screenshots
Description
New external GPS devices supported + improved internal sensors mode. Test your car with even greater accuracy — no extra hardware needed!
Turn your smartphone into a powerful onboard dyno!
Measure your car’s real engine power and torque with 2% accuracy — all by performing a simple acceleration!
Verify the effectiveness of your tuning, remaps, or upgrades with an independent, objective, and affordable solution.
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What is PerfExpert?
PerfExpert – Car Onboard Dyno & Timer is a professional-grade app that lets you measure your car’s real performance:
• Engine power & torque curves
• 0–60 mph / 0–100 km/h acceleration times
• Quarter mile / 400 m times, and more.
All tests are performed using just your phone — no connection to your car required. Results come in detailed reports with interactive charts.
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How does the dyno work?
1. Create your car profile
Enter key specs like curb weight, tire size, and displacement. If you’re unsure, the app helps you find them.
2. Mount your phone securely
No need for OBD or external sensors. PerfExpert uses your phone’s internal sensors to capture acceleration accurately.
3. Perform a full-throttle pull
On a flat, straight road, accelerate from low revs to redline in one gear — done!
Note: Dyno tests are not compatible with automatic gearboxes that lack a manual mode.
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What can you do with PerfExpert?
• Evaluate ECU remaps, chip tuning, and intake/exhaust mods
• Track changes after hardware upgrades or chassis setup changes
• Share dyno reports with your tuner or friends
• Export your runs as interactive charts and raw data
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Sample reports & FAQ
• Featured results: https://www.perfexpert-network.com/results/featured
• FAQ: https://www.perfexpert-app.com/faq
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Join the community
• Facebook page: https://www.facebook.com/PerfExpert
• User group & support: https://www.facebook.com/groups/perfexpert/
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Key features
• Dyno Test:
Accurately measure horsepower and torque. Includes rev limiter detection and power loss modeling.
• Correction standards:
Apply standard corrections (DIN, SAE, ISO, JIS, CEE) using real-time ambient conditions (pressure, temperature, humidity).
• Timed Run Test:
Measure acceleration and distance milestones: 0–60 mph, 0–1/4 mile, 0–100 km/h, and more.
• High-frequency sensor use:
Maximum precision thanks to high-rate accelerometer sampling and advanced smoothing.
• Connect to external GPS devices like RaceBox Mini, Mini S, Micro, RaceBox.ru, or VBox Sport for even higher accuracy and features like rolling start dyno runs (requires PerfExpert Pro su).
• Share results online with a public web link, viewable on the PerfExpert Network
• Custom units:
Supports a wide range of units: Hp, Ch, Nm, Ft.lb, m/s², °C, psi, km/h, mph, m, ft, etc.
• Results can be exported as TSV data file or PNG image.
Privacy Policy: https://www.perfexpert-app.com/privacy-policy
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
What’s New
Version 2.3.1
New in 2.3.1:
• Fixed an issue where sensor rate and smoothing were incorrectly calculated when opening results created before version 2.3.0
New in 2.3.0:
• Added support for external GPS devices: Racebox.ru, RaceBox Mini, Mini S, and Micro (PerfExpert Pro subscription required)
• Added the ability to make a support request about a result
• Improvements to internal sensors mode:
• Removed mandatory calibration
• Prevented START button if the car is not fully stopped
• Improved accuracy
• Bug fixes and stability improvements
Ratings and Reviews
Need a little help
Trying to put all the numbers in properly to dunk the car but I have a 2017 civic lx hatch that is a CVT transmission. I have full bolt ons and running full e85. In the fuel option it only lets me choose between gasoline or diesel and the second problem I have is that I don’t really have any defined gear ratios besides my first gear final drive and reverse. Would the app still be accurate missing those parameters?
Developer Response ,
Hi Justin, thank you for your feedback! Currently the Dyno mode in the app needs that the gearbox used can be locked to a fixed ratio during the measurement. This is well mentioned in the app description, as well as in our FAQ here : https://www.perfexpert-app.com/faq#8
This allows the app to calculate engine rpm without the need for a OBD connection. CVT gearboxes doesn't have fixed ratio, but instead the ratio is variable during car acceleration and this will make the current Dyno measurement mode inaccurate (specifically for the torque).
We plan to add a Dyno mode compatible with this kind of gearbox, to provide the wheel horsepower of CVT equipped cars, instead of the engine horsepower as it's the case in the current Dyno mode.
However your can use the Timed Mode with any kind of gearbox.
Very accurate, useful and stable
I have tested numerous apps which some where OBD2 connected and some like this one, independent of OBD2 being a stand alone one.
I was surprised to find out how accurate this app in comparison to a standard dyno. In fact, I feel that this app gives me a more reliable reading in comparison to commercial dyno where parameters can be adjusted by the operators which may not be in line with the proper characteristic of my car.
One improvement that I would suggest is: to allow the user to choose the 2 or 3 results that will show up as the “average “ and allow to present this “average “ in a graph.
Great app.
Calibration
Once I go through the calibration routine, it gives me no choice to move onto a test-only a “back” button that takes me back to the “calibration” button, forcing me to start over, in a circle. What may I be doing wrong?
App Privacy
The developer, Claude JOSEPH ANGELIQUE, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.
Data Linked to You
The following data may be collected and linked to your identity:
- Contact Info
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Information
- Seller
- Claude JOSEPH ANGELIQUE
- Size
- 26 MB
- Category
- Sports
- Compatibility
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- iPhone
- Requires iOS 15.0 or later.
- iPad
- Requires iPadOS 15.0 or later.
- iPod touch
- Requires iOS 15.0 or later.
- Apple Vision
- Requires visionOS 1.0 or later.
- Languages
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English, Bulgarian, French, German, Hebrew, Italian, Norwegian Bokmål, Polish, Portuguese, Russian, Spanish, Swedish
- Age Rating
- 17+
- Copyright
- © 2025 PerfExpert SAS
- Price
- $12.99
- In-App Purchases
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- Pro for one month $9.99
- Pro for one year $79.99