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Wireless freedom with bluetooth connectivity to your MegaSquirt. It is great to just connect right up to your ECU without and cables, especially if you have an adapter that provides some range, you don't have to be in, or in some cases even very near the vehicle! now with Android support via Shadow Logger and Shadow Dash, some for of bluetooth support on your ECU is more important than ever. However there are some key features you will want to see in an RS232 Bluetooth adapter for easy operation and some limitations you should be aware of before throwing away the RS232 cable completely.

Power from PIN 9 - Many of the better RS232 Adapter, but not all offer the option to power off of pin 9. This lets you just plug the Adapter into your v3.0 or v3.57 MegaSquirt and the BT adapter will be powered by the MS with no extra power line. This is much more convenient and automatically powers on the Adapter when you power on the ECU. However this can be troublesome if you are trying to diagnose an issue while cranking your vehicle; each time you power cycle the Adapter, The PC or Android device will need to re-pair with the adapter and recreate the virtual com port. This will cause a delay and you will not be able to communicate with your ECU for 15-30 seconds. This is likely not a big deal for normal operation, but if you are diagnosing a cranking issue you will either want a cable or a separate power source for your BT adapter.

Data Rate / Throughput - The read rate capability is an attribute in which we have witnessed a large variance between different BT Adapters. You typically will NOT get as fast a read rate for run time data with a BT adapter. With a carefully selected Adapter you will get a very acceptable or even close to cable performance. Although the capable data rate of bluetooth is well above typical RS232, it seems there is additional ping latency between send and receive that will lower potential read rate. I don't know if there is a way to know what sort of through an Adapter is capable of without testing it. In testing we have found that the Class 1 adapter we offer can provide TWICE the data rate of a GBS 301 in many conditions.

Male DB9 connector - The DB9 must either be able to connect as a male pin out with proper RX & TX polarity, or you will need a gender changer. In general you will need some for of gender change no matter what adapter you need because while you are connected to the controller you need a male pin out, but when configuring from your PC you will need a female pin out. Some adapters use a null modem adapter to satisfy the gender change with proper polarity, others have switchable RXTX polarity. If you have one with a null modem adapter, it often does not pass power through PIN 9.

Range - Additional Range does come in handy. While you will doubtfully be able to leave your laptop running in the pits while out making a pass, you can easily move around the garage or much further while maintaining a sold connection. A good class 1 adapter will give you a realistic practical range to tune from a few rooms away or nearly a block away in an open area. in addition the class 1 signal can help insure you do not experience interference from surrounding EM noise.


Configuration and trouble shooting.

If you are experiencing difficulty communicating with your controller via bluetooth and your adapter meets the above criteria, these are some common key settings that will cause the adapter to pair fine, but fail to pass back data from your ECU. The focus of these settings is on the Adapter, not the PC. These must be configured correctly on your RS232 Bluetooth Adapter. The default settings vary by adapter, so you must refer to the manufacturers documentation. The Class 1 Bluetooth Adapter offered by EFI Analytics come pre-configured and we offer a utility program to configure it for proper ECU communication with a single click.

Baud - Make sure the baud is set correctly on the adapter. The default speed varies between manufacturers, but is commonly 19200 or 9600 baud. There for the default settings typically will not work with an MS2 or MS3 and must be configured properly according to the instructions included with your adapter.

Hardware Flow Control - This must be turned off.

Echo - On many adapters you must make sure Echo is turned off.

RX TX Polarity - This will vary according to adapter and gender changers. On the EFI Analytics Class 1 Bluetooth Adapter, it is switchable. The small switch near the DB9 must be away from the DB9 during normal operation when using the included gender changed.



Logger Status Screen

Version 1.21

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Notice: Shadow Logger is still available as a free download, however in most instances you will want to use the much more current Shadow Dash MS


About Shadow Logger:

  • Supports All MegaSquirt Firmwares

Shadow Logger MS can capture data logs (FRD Format) without a laptop using your Android 2.1 or higher Phone or Tablet via Bluetooth. It will work with all MS1, MS2 and MS3 controllers with any firmware variant, actually you can capture data from any device that TunerStudio supports. The majority of basic run-time values are displayed while connected and also fields from your phone such as Accelerometer data. You can then set it to automatically upload to where it is transformed into a standard msl file for use with MegaLogViewer, and yes the Accelerometer Data will be in the log file too. This lets you log on the way to work, when you get there, just log into and your log from the drive home will be waiting for you. By placing the more complex Class 1 RS 232 Blue Tooth Adapter
Tested Class 1 Bluetooth Adapter
work on a server, it allows for the broadest device  support and better battery life.



The focus of this initial release is to make it as simple as possible to manage your log files while providing the broadest possible support. This includes a significant testing various BluetoothShadow Logger Readouts

adapters to find the best performing and simplest to set up. This testing led to the discovery of this Class 1 RS232 Bluetooth Adapter that demonstrated the fastest connect time, and greatest throughput at 115200 baud of any device tested. However even with the device selected, configuration of most of them can get confusing as well. You must be sure to set the proper baud rate, set echo off, proper RX and TX polarity, HW flow control off, etc. So we offer these pre-configured for your MS1, MS2 or MS3 to help make it as straight forward as possible to get your Android up an going. is a new EFI Analytics site to simplify your log file management, with much more to come. Soon will allow you to share log files with friends giving you one place to share log files.

For those of you waiting for Full tuning and the cool dashboards, no fear, they are coming. I first want to be sure we have stability and reliability for the majority of current devices.

To download Shadow Logger MS, go to the downloads page.






Shadow Logger MS is completely free, but not in the Android Play store. You will need to download it here and install it locally. Once the beta period expires there will likely still be a free version and a full features pay version.

Enable Unknown Sources

Before attempting a manual installation of apps using the .apk files, you must first allow your phone to install from “Unknown Sources” (i.e. non-Market apps).

To do this, navigate to Menu -> Settings -> Applications and check the box marked “Unknown Sources“.

You can then run the .apk file from any file manager and you will have the Shadow Logger MS icon available with your applications.



Android Device:

  • Android 2.1 or Higher
  • Bluetooth capability

Additional Requirements

  • Bluetooth to RS232 Adapter

Optional feature support:

  • Accelerometer on Android (most 2.1 or higher Android devices will have this)
  • GPS sensor

Having the Accelerometer and GPS allows you to capture this additional data.