AcceloVibe Support

We’re here to help you get the most out of AcceloVibe.

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Quick Start Video Guide

Watch this short video for a rapid walkthrough of setting up and running your first AcceloVibe test.

▶️ Watch Quick Start Guide on Instagram

User Manual

Below you’ll find the essential steps to make the most of AcceloVibe. For a full PDF guide, visit the documentation page.

  1. Install AcceloVibe from the App Store and launch the app.
  2. Enter your vehicle’s make, model, and year in the configuration screen.
  3. Start your car, ensure it’s idling on a flat surface with the parking brake engaged, then exit the vehicle.
  4. Tap Start Test and place your iPhone (with a non-slip case) on the center of the hood.
  5. Wait 30 seconds while AcceloVibe captures vibration data.
  6. Review the color-coded results, graphs, and detailed analytics directly on your phone.

For additional tips, troubleshooting, and advanced use cases, check our FAQ below or contact our support team.

Understanding AcceloVibe

AcceloVibe isn’t just a vibration visualizer. It’s an advanced diagnostic engine that uses your iPhone’s built-in sensors to assess engine health with the precision of a trained mechanic.

⚙️ How It Works
  • Vibration Data Collection: iPhone’s accelerometer captures engine vibration at idle and performs FFT to extract key frequencies.
  • Rotational Frequency (RF): The base engine vibration (used to calculate RPM).
  • Firing Frequency (FF): How often cylinders fire — often a multiple of RF.
  • Harmonic Detection: Identifies and scores expected vs. unexpected mechanical vibrations.
  • Idle Stability: Measured by frequency width (FWHM) to assess RPM fluctuations.
  • Engine RPM: Inferred from RF using the formula RF × 60.
🔬 Advanced Detection
  • Harmonic Ratio: Compares harmonic strength vs. FF. Low = healthy. High = imbalance.
  • Non-Harmonic Peaks: Detects unexpected mechanical anomalies like shaft misalignment or fan resonance.

🔍 Engine Analysis Panel Breakdown
  • Firing Frequency (FF): Cylinder fire rate — should stay stable.
  • Rotational Frequency (RF): Base engine vibration — used for RPM.
  • Engine Speed (RPM): Normal idle is 600–1000 RPM.
  • Engine Speed Fluctuation: Lower % = more stable.
  • Frequency Width: Reflects how “tight” or “messy” the idle frequency is.
  • Harmonic Balance: When enabled, shows vibration cleanliness.
📈 Interpreting Stability
Fluctuation %MeaningAction
< 0.5%ExcellentNo concern
0.5 – 1.5%NormalAcceptable
1.5 – 3%ModerateMonitor
3 – 5%UnstableCheck engine
> 5%Very UnstableNeeds inspection
🎯 Harmonic Health (When Enabled)
RatioStatusImplication
< 0.1GreenVery clean engine
0.1 – 0.3OrangeMild imbalance
> 0.3RedVibration issue likely
🚨 RPM Spikes Explained

If you see sharp RPM spikes in the graphs but don't observe them in real life, it's likely caused by:

  • Momentary sensor noise or phone movement
  • Transient interference from fans or pumps
  • FFT misdetection due to weak signal at low RPM

Solution: Re-test with the phone placed firmly and steadily on the hood. Ensure no movement or wind during test.

Contact Support

If you still need assistance, please email us directly:

📧 support@accelovibe.com