$299.99
Engine RPM
Acoustic Tachometer
⭐️3.9 / 5
Rating
🙌27
Ratings
📼3 scs
Content
📦w/o updates
Updates frequency
🗣❌ unsupported
Your locale
- Versions
- Price History
- Description
- FAQ
All Versions of Engine RPM
2.5
September 13, 2023
* Optional Low-Pass Filtering to suppress high frequency interfering sounds.
* Optional signal rectification to transform high frequency percussive bursts into low frequencies that were otherwise too low to be detected by the microphone.
* Older unreliable modes of operation were removed (auto ranging and tracking) in favor of the more reliable Hint Band mode.
* Built-in help is greatly expanded.
More2.4.1
July 1, 2020
Fixed a problem with Settings visibility when Dark Mode is used in iOS 13.
More2.4
June 18, 2020
* Improved signal analysis calculations, making envelope detection unnecessary.
* Use of speaker in "Match RPM sound" mode is louder.
* Revised time-stamp in logging to reflect time of day.
* Configurable logging interval.
* Improved help files.
More2.3
May 27, 2016
1. Sample times up to 3 seconds for measuring lower RPM.
2. Envelope detection option.
3. Sound-generating option for manually matching to the engine sound.
4. More extensive help files for each setting option.
More2.2
November 17, 2015
iOS 9 compatibility issue fixed.
Added user-configurable sample lengths for faster-changing RPM.
Improved analysis algorithms for better sensitivity and noise rejection.
Added a logging function for saving RPM readings over time and sending them by e-mail.
More2.1
September 24, 2013
Fixed a crash in iOS 7 devices.
2.0
June 14, 2013
Improved analysis of the engine sound, using an autocorrelation algorithm that provides more reliable RPM readings.
Addition of an automatic mode option; no adjustments needed.
Compatibility with iPhone 5 (software utilizes all of the 4-inch screen).
More1.1
June 24, 2010
Spectrum analysis has been improved to better identify the harmonics of the engine sound.
A new Tracking mode has been added to track changing RPM over the entire 500-90,000 RPM range.
The range of harmonics used in analysis is now selectable, using harmonics 1-16.
The 4-cycle, 1-cylinder engine has been added to the list of stock engine configurations.
Detection of a missing microphone for the iPod Touch has been added.
More1.0
December 2, 2009
Price History of Engine RPM
Description of Engine RPM
Measure the RPM of an engine by analyzing the sound it makes. Engine RPM listens to the sound of a running engine and uses advanced signal processing algorithms to extract the frequency of that sound and calculate the RPM.
This app is primarily for setup and diagnostics of engines. After setting the the number of cylinders and whether the engine is a 2-stroke or 4-stroke engine, the app can work with any internal combustion engine, from diesel tractors to aircraft engines to motorcycles to chainsaws. To use the app you must set an expected RPM range to guide the analysis algorithms to the correct RPM. A real-time graph of the autocorrelation graph is displayed to help in troubleshooting and adjusting the expected RPM range.
The analysis requires a clear sound from the engine without excessive interference from extraneous sounds. Do not expect to read the RPM of an engine while other things are making too much noise at the same time. The analysis also requires that the RPM be stable. It cannot read the RPM of an engine that is rapidly accelerating. For this reason, and because of the need for adjusting the expected RPM range, this app should not be considered a drop-in replacement for an operational tachometer.
Setup options include update periods from 93 milliseconds to 1.5 seconds, one to 12 cylinders, 2-stroke or 4-stroke, low-pass filtering, and signal clipping. The overall RPM range is 400 to 90,000 RPM (although at any one time, the operational range is typically +/- 30% around a nominal expected RPM). Precision is usually about +/- 10 RPM.
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Engine RPM: FAQ
No, the Engine RPM app is not compatible with iPads.
The creator of Engine RPM is Real-Time Specialties, inc..
The minimum iOS requirement for the app is 12.0 or higher.
The overall rating of Engine RPM is 3.9 out of 5, which is okay but could be better.
The App Genre Of Engine Rpm Is Utilities.
2.5 is the most recent version of Engine RPM.
Engine RPM’s latest update was rolled out on July 1, 2024.
The app was launched on February 6, 2023.
Family-friendly content, no mature themes or violence.
The Engine RPM app is now available in American English.
Unfortunately, Engine RPM is not on Apple Arcade.
Unfortunately, in-app purchases are not available within Engine RPM.
Unfortunately, Engine RPM is not optimized for use with Apple Vision Pro.
