RacecapturePro MK3 hardware install

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Mounting Orientation

The default and recommended mounting orientation is flat with indicators facing aft for driver visibility (if mounted forward of the driver).

RaceCapturePro MK3 installation orientation.png

  • Mount as flat as possible for best performance from the built-in accelerometer / gyro.

Alternative Mounting

You can mount the system in other orientations. For best accelerometer and gyro performance, it's recommended you mount in an orientation that's square to the orientation of the car.

  • Example:
    • Upside down
    • Vertical / on edge

If an alternate mounting orientation is chosen, you should re-map the accelerometer and gyro channels to reflect this change.

Mounting Dimensions

RaceCapturePro MK3 dimensions.png

(Click to zoom)


RaceCapturePro MK3 Rear Diagram.png

Main Connector

The main connector provides access to all power, sensor and communications for the RaceCapture/Pro system.

RaceCapturePro MK3 Molex pinout.png

RaceCapture/Pro MK3 connector pinout
Connection Color
12v Red
Ground Black
Frequency / RPM sensor inputs
Blue Frequency / RPM input 1
Blue / White stripe Frequency / RPM input 2
Blue / Green Stripe Frequency / RPM input 3
Blue / Orange Stripe Frequency / RPM input 4
Voltage Reference
Yellow +5v reference
Analog Sensor Inputs
White Analog Input 1
White / Black Stripe Analog Input 2
White / Orange Stripe Analog Input 3
White / Blue Stripe Analog Input 4
White / Gray Stripe Analog Input 5
White / Green Stripe Analog Input 6
White / Red Stripe Analog Input 7
White / Brown Stripe Analog Input 8
General Purpose Input / Output (GPIO)
Gray GPIO 1
Gray / White Stripe GPIO 2
Gray / Blue Stripe GPIO 3
Auxiliary Serial Input
Purple / White Stripe Auxiliary RS232 Serial TX
Purple Auxiliary RS232 Serial RX
Orange / Blue Stripe CAN 1 High
Orange CAN 1 Low
Orange / Green Stripe CAN 2 High
Orange / White Stripe CAN 1 Low

Plug Connector Type

The connector is a standard 24 pin Molex Mini Fit Jr.

  • Plug Housing: Molex Mini Fit Jr. 39012240
  • Compatible Pins: Molex 39000039

Other connector sources

A 24 pin Molex harness from a computer power supply can also work as a secondary wiring harness.


Connect the included GPS antenna to this port.

  • Note: Tighten this connection to 5-6 inch/lbs (just beyond finger tight). Do not over torque

Cellular Telemetry

If optioned with the 3.5G real-time cellular telemetry module, connect the cellular antenna to this port.

  • Note: Tighten this connection to 5-6 inch/lbs (just beyond finger tight). Do not over torque

Antenna Placement Guide


For optimal GPS reception, install GPS antenna with a clear 360 degree view of the sky, such as on the roof of the vehicle.

Cellular antenna

For optimal cellular performance, install the cellular antenna on the roof of the vehicle, using the roof as a ground plane.

Antenna separation

It's recommended you separate the GPS and cellular antennas as reasonably far apart as possible, such as mounting at opposite ends of the roof. RaceCapture Pro MK3 antenna install.png

  • Note: - about 3 foot / 1 meter separation is ideal.

RJ45 CAN + Power connection

The RJ45 port provides connections for power and both CAN channels.

RaceCapturePro MK3 RJ45 pinout.png

(Orientation is looking into the RJ45 port)


The RJ45 port is normally provided for the OBDII CAN cable accessory for a convenient plug and play OBDII connection

CAN OBD2 cable.jpg

Custom Cable

You can also use a common RJ45 ethernet cable to provide power, ground and CAN bus data for a custom application.


RJ45 power and CAN connection pinout
Connection CAT5 EIA-T568B RJ45 cable
+12v Brown
Ground Orange/White
CAN 1 High Orange
CAN 1 Low Green/White
CAN 2 High Blue
CAN 2 Low Blue/White

Note: These color codes assume EIA-T568B RJ45 cable (check printing on the cable to confirm)


Connect RaceCapture/Pro to a 12v source, ideally switched with main power or via ignition power.

RaceCapture Pro MK3 Molex pinout power.png

Power requirements

Power requirements
Voltage 12-24v
Fused circuit 5A max

Powering Notes

  • You can also power via the RJ45 connector, useful when plugging in to OBDII.
  • Power can not be passed between RJ45 and the main connector, to prevent backfeeding of circuits in the vehicle.


Analog Sensor inputs

9 analog sensor input channels are provided: 8 are available for dedicated sensors, plus a 9th internal channel assigned to battery voltage.

Analog channel specifications
Voltage Range 0-5v
Input Impedance Greater than 1M ohm
Voltage protection 400v (intermittent)
ADC precision 12 bit SAR
Maximum Sample Rate 1000Hz (logging to SD card)
Mapping supported Raw voltage / linear formula / interpolated map

Connecting Sensors

Connect each analog sensor to the respective analog sensor input on the main connector.

RaceCapture Pro MK3 Molex analog inputs.png


Frequency / RPM sensor input

You can connect RPM, wheel speed and other pulse-type sensors to RaceCapture/Pro frequency input pins.

Frequency channel specifications
Voltage Range 0-12v
Input Impedance Greater than 1M ohm
Voltage protection 400v (intermittent)
Maximum Sample Rate 1000Hz (logging to SD card)
Mapping supported RPM / Frequency / Period

Signal input quality

Verify the source provides a relatively clean, pulse signal that transitions between 0 and 5-12 volts.

Special note about RPM inputs

For best performance and reliability, it's preferred to obtain a clean RPM signal from the engine's ECU.

  • Verify if the signal you're tapping is driving the ignition coil directly, or if it's feeding into an igniter. If it's powering the coil directly, use the CoilX module to buffer / filter the high voltage signal.
  • If uncertain, visualize the RPM signal using an oscilloscope - you should see a relatively clean square wave as the source.
  • If your only source for RPM is the trigger wire driving the ignition coil primary winding, then you will need the CoilX module to buffer / filter the noisy, high-voltage component.

Connecting Sensors

Connect each sensor connection to the respective frequency sensor input on the main connector.

RaceCapture Pro MK3 Molex pinout freq inputs.png

See our RPM connection guide for more information connecting and calibrating these frequency / RPM channels.


RaceCapture/Pro provides 3 General Purpose Input Output (GPIO) ports which you can use to control devices (Output mode) or read switches or high / low states of electrical signals.


GPIO channel specifications
Output mode type Open Drain (connects ground when activated)
Output current capacity 1A, inductively clamped
Input mode voltage range 0-12v
Input voltage protection 0-40v - inductive protection up to 1A

Input Mode

When configured for input mode, the RaceCapture/Pro sensor input will register a '1' when the input passes a voltage threshold of approximately 3v, and '0' when the input is low (close to 0 volts).

Important Note: when sensing large inductive loads, such as sensing brake light state or sensing the on/off state of a motor, connect a 10K 1/4 watt resistor in-line with the GPIO input to protect RaceCapture/Pro from a large inductive spike.

Output Mode

When configured for output mode, RaceCapture can sink a 1A load per port, suitable for driving indicators, relays, sending signals to other systems and driving small devices.

Output Behaviour

  • When the port is active, the port will connect to ground.
  • When the port is inactive, the port will be an open circuit.

GPIO Connections

RaceCapture Pro MK3 Molex GPIO.png

Controlling GPIO Ports

GPIO channels in output mode are controlled by the logic you create with the on-board Lua scripting capability.


CAN Channels 1 / 2

Two CAN channels are provided on the main connector as well as on the RJ45 connector.

See the CAN bus / ECU integration guide for information on integrating CAN bus communications and CAN channel mapping

CAN channel specifications
CAN channels 2
CAN Baud Rate 125K, 250K, 500K, 1M Baud
CAN Filters 14 per channel
CAN bus compatibility CAN 2.0 compatible, 1M baud
CAN termination Software controlled


RaceCapture Pro MK3 Molex CAN pinout.png

Auxiliary Serial

One Auxiliary RS232 compatible serial port is available on the main connector. You can use this to communicate with external devices that uses standard RS232 signaling for communications.

RaceCapture Pro MK3 Molex pinout aux serial.png

Control and communication of this Auxiliary serial port is provided through Lua Scripting, where you can control and receive data from external systems and map received data to virtual channels that can be provided in the telemetry stream.