As of 20-Feb-2022 all units with included harness connections will ship with standard size Micro-fit/3mm connections. If you would like the old high-current connectors that were used on previous units, please leave a note on your order. We have a few of these connectors left.

Why the change? Well, there are a few reasons. First, the high-current connectors are out of stock at all the suppliers. Second, the old connectors were often difficult to crimp properly with generic micro-fit hand crimp tools. Third, they were overkill, the standard connectors have ample current rating. Finally, by using the standard connectors we can provide pigtails. We did not provide these before because the standard and high-current connections did not fit well together, and the pigtails only come with the standard connections.

The UA4C uses SMD technology to make a 4 ignition/4 injection channel board smaller, with more features, and cheaper. It is a bottom mounted Arduino MEGA shield. The MEGA is placed upside down on top of it.* This makes the total package thickness less than 20mm. All of the outputs (except for stepper idle) include an LED for quick troubleshooting during setup. An externally accessible jumper blocks resetting of the system when a USB cable is connected. Wire housings and 50 (four extra) terminals are included to connect your wiring to the PCB. Will fit in the slim or standard height Hammond case. If you include soldering service the pins connectors will be soldered to the board. All SMD parts come solder no matter which option you choose. If you require special provisions you can leave a note on your order use the contact form on the help page.

Outputs

– 4 ignition channels, logic 5V, 330mA max pulse
– 4 injector channels, ground switching
– 4 high current outputs (idle, idle2, boost, vvt) ground switching
– 8 low current outputs (fuel pump, tachometer, fan, fan2, aux1-4) ground switching
– Stepper idle control (any version starting with C includes stepper control chip built in)

Inputs

– 2 triggers (crank, cam, etc, logic level with socket for conditioner modules)
– MAP 400kPa and separate barometer onboard
– Voltage correction
– Throttle position
– Coolant and incoming air temperature
– Oxygen
– Flex fuel (interrupt pin)
– Launch
– Knock (future code update) (interrupt pin)
– 2 spare inputs

Version vC5 White Fang changes include:

-Labeling improvements
-Still assembled in the USA 🙂

Version vC4 White Fang changes include:

-Changes for semiconductor shortages including:
-Swapping MOSFET and vReg footprints
-Option to use two models of stepper control IC
-Still assembled in the USA 🙂

Version vC3 White Fang changes include:

-Minor component/placement adjustments
-Further increased voltage spike tolerance and reverse polarity protection
-Still assembled in the USA 🙂

Version vC2 White Fang changes include:

-Integrated stepper idle controller
-Minor component/placement adjustments
-More labeling
-Easier use of external MAP sensor
-Through-holes adjusted for easier soldering of header pins
-Critical solder jumpers now have a default setting (12v tacho, standalone, internal MAP)
-Increased voltage spike tolerance
-Still assembled in the USA 🙂

Version vB3 Sea Fox changes include:

-All boards now ship with 400kPa MAP sensors for no limit boosting 🙂
-Minor component/placement adjustments
-Further improved labeling
-Assembled in the USA

Version vB2 Sea Fox changes include:

-All SMD components including the sensors are now soldered on from the factory
-5 volt output is protected from overload
-Corrected parallel install issue
-Harness connector footprint improved to better hold the connector while soldering
-Further improved labeling
-Assembled in the USA

A new version of the UA4C (vB1 Sea Fox) is available
Changes include:

– Rearranging the serial headers for better fitment in the slim case
– Upgrading the low current outputs, they now support larger loads and are self-protecting
– Changed tachometer circuit to allow 5V, 12V, and high voltage tachometers
– Added indicator LED for 5V power, and improved labeling

Communications

– Serial3 routed to external connector (optional CAN with extra controller)
– Bluetooth header with blocking diode to allow use of USB

Extra Stuff

NOTICE: This is an unofficial Speeduino board. Josh Stewart was very kind in adding a definition for this board to the Speeduino code. However, purchases of this board do not directly contribute to his upkeep and updates to the Speeduino software and website. PLEASE consider visiting Speeduino Forum and clicking Support Speeduino at the top.

*In order for the MEGA to fit the unused power jack must be removed. To do this use a pair of side cutters and cut the metal strap on the jack closest to the outside edge of the Arduino board. Then use a pair of slip-joint pliers to twist the jack back and forth while pulling it away from the PCB. It should come off fairly easily, but please take care when doing so. We will assume no responsibility for Arduino, bodily, or other harm. If you order an Arduino MEGA from us this will be done already.

Tools

NOTE: These are for the retired connectors, for the new connectors use something designed for Micro-Fit.
These are the part numbers of official harness tools. While not eBay cheap, they are not as costly as you might think.
EDIT: PRICE OF THESE TOOLS HAS GONE UP SUBSTANTIALLY. 🙁
Hand Crimp: 10129483-001LF
Terminal Extractor: 10129274-030LF

Awesome User Created Stuff

Cool 3D printed case: https://www.thingiverse.com/thing:4574403

Errata

vA3- No known.
vB1- The solder jumper on the bottom for parallel installation does not work as intended. Please contact me for additional steps if you wish to install in parallel with another ECU.

Ocelot Terminals

UA4C for Speeduino

UA4C Harness Plugs

UA4C Pigtail Harness

WTMtronics Short Sleeve T