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So you either have hardware under way, or are considering getting rusEFI hardware. This manual is intended for those that are using purchased hardware. If you are not, don't worry, we also encourage DIY and like hearing back from those that have. We also encourage people to use the purchased boards as a starting point for a DIY effort, feel free to modify the board we'll likely make suggestions on how to make your effort better.

Hardware requirements

Plan the engine

The engine will need wires that connect to various sensors and devices. You will need crimp tools, soldering tools, and certain electrical and mechanical skills.

We suggest that before you purchase hardware, that you create a plan with a schematic. Even if the schematic is on a napkin, I suggest you take picture of it with your phone or scan it in and get feedback from members in the forum. We can help steer you to a successful build.

Start ordering components

Once you have a plan, you can start making a bill of materials. You'll likely be purchasing harnesses, wires, connectors, and all sorts of things. You may have to do junk yard runs to get certain hard to obtain items, ect. If you have your rough schematic at arms length, it will really help you know what you need and when you'll need it.

Assembling components

We should offer some notes about crimps, how to verify a good crimp, things like that.


Preparing your engine

Physically locating the controller

Place some place that is away from hot items like the exhaust. Mount on a piece of steal that can function as a heat sink. Preferably in a dry well ventilated location, were the wires can be easily routed to and from.

Route the wires and harnesses

It is recommended you route your wires in two different groups, analog and digital/high power. This helps ensure good signals make it to and from the ECU.

Testing the wiring

Once connected you should test the wires. Especially the power wires like coil wires and injector wires. A poor connection with a slight resistance like .1 ohms can cause an electrical fire, which I'm sure you do not want. Once everything is connected measure both the voltage drop and current from the ECU connector, or where ever is applicably appropriate. Using your voltage and current readings, calculate the ohms, if it's above about .1 ohms fix the issue. Take note that .1 ohms at 1A is about .1watt that that connection will have to dissipate. If you have a 12 cyl, and 12 .1 ohm connections, the connector will have to dissipate 1.2 watts.

Diagnostics and trouble shooting of your engine

Basic tests

List basic tests here, like is LED on, are jumpers installed correctly if applicable, find hot components and do basic visual checks for burn things and such.

Test equipment tests

List tests that can be done with O-Scopes, multimeters, scan tools, and other such options for diagnosing a problem.

Get help from a local

We provide much more info than most OEM options. If you are stuck, you may be able to get help from a local mechanic or someone local. Try asking for help in the forums there may be a member or a club meeting that's near by. It's common you can find local people who are willing to help.

On board hardware diagnostics

Don't have a scope, no problem, the IO board has basic scope built inside. You can connect pin blah to nearly any point on the board and you can measure a variety of points synchronized with the logging software.