Reviews of PerfExpert - Car Dyno HP Test

By: PerfExpert App

List of user reviews and ratings for PerfExpert - Car Dyno HP Test

Total ratings

2.48 (Rating count: 856)

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Review summary

Users appreciate the app's detailed configuration options and potential for accurate dyno measurements when correctly calibrated. However, common issues include frequent crashes, difficulty completing calibration and runs, and inconsistent or inaccurate results especially at higher power levels. Many users report poor or no customer support and frustrations with app complexity and missing vehicle support. While some find it functional after effort, the overall experience is marred by technical instability and usability challenges.

Pros

The app provides very detailed and technical configuration options for various car models, which some users find attractive.
When calibration and settings are done correctly, the app can deliver accurate horsepower and torque measurements comparable to a real dyno.
Manual entry of weather data is available, helping to reduce unnecessary automatic updates.
The calibration process, although sometimes requiring multiple attempts, is considered manageable by some users.
The app supports custom gear ratios and vehicle parameters, offering a comprehensive dyno simulation experience.

Cons

The app frequently crashes and often fails to complete calibration or dyno runs, causing user frustration.
Results are reported as wildly inconsistent and inaccurate, especially when measuring horsepower over 400bhp, with values jumping significantly between runs.
Customer support is largely unresponsive, sometimes taking months to reply or failing to reply at all, leading to poor user assistance.
The app lacks support for certain cars or drivetrain configurations, such as automatic transmissions or specific gear inputs (e.g., 5th gear), limiting usability.
The calibration instructions and app interface lack clarity, making it difficult for users to perform correct setup; the app is described as temperamental and overly complicated for first-time users.

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User Reviews

Recent rating average: 2.20

All time rating average: 2.48

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62% (13)

Date	Author	Comment
2024-12-08	za*****	App is horrible doesn't work correctly at all waste 15$ . Wish get refund tryed over 10 times get work never worked correctly
App is horrible doesn't work correctly at all waste 15$ . Wish get refund tryed over 10 times get work never worked correctly
2023-09-04	St*****	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.
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.
2023-07-17	Da*****	My car, a 2003 BMW 325i doesn't show up even though every other BMW from that year does. And when you do the Dyno you can't have an Automatic transmission. My car is automatic but you can select the gears it is in. I'm confused about what the gear minimum RPM us and the starting speed even though you start from a standstill. And my biggest confusion is: based on the formula for HP (HP=torque*rpm/5252) HP and Torque will always be the same at 5252 RPM, but the graphs never cross at 5252 RPM
My car, a 2003 BMW 325i doesn't show up even though every other BMW from that year does. And when you do the Dyno you can't have an Automatic transmission. My car is automatic but you can select the gears it is in. I'm confused about what the gear minimum RPM us and the starting speed even though you start from a standstill. And my biggest confusion is: based on the formula for HP (HP=torque*rpm/5252) HP and Torque will always be the same at 5252 RPM, but the graphs never cross at 5252 RPM
2023-04-27	R *****	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.
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.
2022-12-17	Da*****	Absolutely useless as soon as you go over 400bhp, a different result every single time... And not by 5-10bhp precisely ...
Absolutely useless as soon as you go over 400bhp, a different result every single time... And not by 5-10bhp precisely ...
2022-05-17	Ke*****	Seriously worst dyno app I have ever tried. It is so hard to do anything on the app. Save your time and effort and do not waste money
Seriously worst dyno app I have ever tried. It is so hard to do anything on the app. Save your time and effort and do not waste money
2021-01-07	Bo*****	Works as a charm, only issue I'm having is with the time update unable to get the weather.
Works as a charm, only issue I'm having is with the time update unable to get the weather.
2020-09-12	Ne*****	I'll adjust my rating when this app is updated to support 5th gear inputs. The Gen2 F150 has the 10-speed automatic transmission and dyno pulls are done in 5th gear. Please add this ASAP.
I'll adjust my rating when this app is updated to support 5th gear inputs. The Gen2 F150 has the 10-speed automatic transmission and dyno pulls are done in 5th gear. Please add this ASAP.
2020-07-28	Ja*****	Tried this app because of the developers efforts. Wanted to see gearing and rpm calculation applied to an HP app. So far so good. The option for entering weather manually is good for stopping extra weather updates.
Tried this app because of the developers efforts. Wanted to see gearing and rpm calculation applied to an HP app. So far so good. The option for entering weather manually is good for stopping extra weather updates.
2020-06-15	Da*****	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.
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.