RevHeadz Engine Sounds

OBD-II connection instructions for iOS

The following instructions are for the iOS version of RevHeadz Engine Sounds. Note that we currently don't support Bluetooth OBD-II adapters on iOS as most are not Apple certified and are unable to be connected to without jailbraking your phone.

1. Wifi OBD-II Adapter

Connect the adapter to the OBD-II connection port in your vehicles (Usually found near the drivers position, the exact location will vary from car to car.) Shown here is a cheap ELM327 Wifi clone adapter from eBay.

Start the engine of your car.


2. Wifi Connect

You will need to connect to the OBD-II adapter's Wifi prior to running the app on your phone. From the settings on your phone click on the Wi-Fi item. Look for the OBD-II adapter in the list of networks and select it.


If this is the first time connecting to this device you'll probably be prompted for the password. Enter the password supplied by the manufacturer of the device. In our example the password is 12345678


3. Connect Screen

Run the RevHeadz app and navigate to the Connect Screen by clicking the OBD-II button from the main menu. Then click the Connect (Wifi) button.

4. Choose Wifi Address and Port

Specify the Host and Port Number supplied by the manufacturer of your adapter. In our example it is and 35000. Then click the Connect button.




If everything works you should now see the connection showing some data reported by your car. Specify your vehicle's redline RPM using the scroll buttons. This is so the app can map the RPM range of your vehicle to the RPM range of other vehicles that may have different rev ranges than your car. Optionally you can set this value slightly lower to achieve higher revving engine sounds from lower revs. Leave the Optimize Communication setting to On unless you experience issues. Navigate back to the main menu by clicking the Back button in the top left. On the main menu the OBD-II button light will be green when there is an active connection and entering the Drive mode for any of the engines will use OBD-II data to drive the sound simulation.




Make sure no other apps are trying to communicate with the OBD-II adapter while trying to connect with the RevHeadz app as they may prevent it from connecting. Note that some of these apps will maintain an OBD-II connection with your adapter even after closing the app. If you experience issues getting OBD-II to work then click the Diagnostics button after you have tried to connect. The diagnostics screen will contain information that can be saved to a log file on your phone. Click the Copy To Clipboard to save the information so it can be emailed to us.


Navigate to the email program on your phone and create a new email message. Press and hold in the body of the email message and select "Paste" this will copy the stored diagnostics into the email. Send the email to:




The OBD-II feature of RevHeadz is still relatively new so there may be bugs or incompatibilities that we're unaware of yet so please be patient while we work on bringing future updates and improvements.


Some cheap OBD-II adapters don't use a low power mode so should be disconnected from your car's OBD-II port when not in use to avoid draining your car battery.