What is Tefzel wire and why is it used in motorsport wiring?

Tefzel is a brand name for ETFE (Ethylene Tetrafluoroethylene) fluoropolymer wire. It is the go-to wire for professional motorsport and aerospace wiring because it is rated to 150C, 600V, and has exceptional resistance to fuels, oils and chemicals. It is also significantly lighter and more flexible than standard automotive wire at the same gauge, making it ideal for weight-sensitive race car applications.

What AWG wire should I use for my engine management wiring?

For most ECU signal wiring including sensors, triggers and outputs, 20 or 22 AWG Tefzel is standard. For injector and coil wiring, 18 AWG is commonly used. For power feeds, fuel pumps and high current circuits, 16 AWG or heavier is recommended.

What is the difference between Deutsch DTM, DT and DTP connectors?

The DTM series is a miniature waterproof connector rated to 7.5A per pin, ideal for ECU signal wiring and sensors. The DT series is larger, rated to 13A per pin, and is the most widely used connector in motorsport wiring harnesses. The DTP series is a high current connector rated to 25A per pin, used for fuel pumps, fans and other high draw applications.

What is Raychem DR-25 and why is it used instead of standard heatshrink?

Raychem DR-25 is a military specification heatshrink tubing rated to 150C with a 2:1 shrink ratio. Unlike standard heatshrink, DR-25 is flame retardant and resistant to fuels, hydraulic fluids, lubricating oils and aviation fuels. It is the industry standard for motorsport and aerospace wiring harness sleeving.

Should I solder or crimp my motorsport wiring connections?

Crimp every time. Soldering is actively discouraged in professional motorsport wiring because solder creates a hard point in the wire that can crack and fail under the constant vibration of a race car. A correctly executed crimp with the proper tool creates a gas-tight cold weld between the wire strands and the terminal.

What is a PDM and do I need one?

A PDM (Power Distribution Module) replaces traditional fuse boxes and relay panels with a single programmable device. It controls all switched outputs in the vehicle, provides overcurrent protection, and integrates with your ECU for data logging and diagnostics. PDMs save weight, reduce wiring complexity and make fault finding much easier.

How long does a full vehicle rewire take?

A full vehicle rewire at 12Volt Motorsports typically takes between 2 and 6 weeks depending on the complexity of the build, the number of systems involved and the level of finish required. Simple engine bay rewires with a new ECU can be completed faster. Contact us early to discuss your project and timeline.

Do you ship parts Australia wide?

Yes. We ship all products Australia wide. Most in-stock orders are dispatched within 1-3 business days. We stock genuine Haltech, Deutsch, Raychem and Tefzel products so what you see on the website is what we use in our own builds.

Does an aftermarket ECU make my car more powerful?

Not by itself. An ECU is not a power adder. What it does is give a professional tuner the ability to precisely calibrate your engine's fuel delivery, ignition timing, boost control and cam timing to extract the full potential from your existing setup. The power gains come from the quality of the tune, not from the ECU alone.

Which ECU brand should I choose for my build?

Haltech is our primary recommendation for most Australian performance builds. Motec suits professional motorsport at the highest level. Emtron is an Australian-made ECU sitting between Haltech and Motec. Holley EFI suits American V8 applications. FuelTech is the preferred choice for serious drag racing. Contact us on 0458 102 134 to discuss which suits your specific build.

What is flex fuel and can my ECU run it?

Flex fuel means the ECU can automatically adjust fuelling and ignition timing on the fly depending on how much ethanol is in the fuel, so you can run anywhere from standard 98 octane petrol to E85 or any blend without re-tuning. All current Haltech, Emtron, Motec, Holley and FuelTech ECUs support flex fuel with the addition of an ethanol content sensor.

Can you install an aftermarket ECU on any car?

Most wire-in ECUs from Haltech, Motec, Emtron, Holley and FuelTech can be fitted to any vehicle with a custom wiring harness. Haltech also makes plug-in ECUs for popular platforms including Nissan Skyline R32/R33/R34, Mazda RX-8 and GM LS engines. We build custom harnesses for all makes and models.

GM Connectors

Vendor:12Volt Motorsports

GM Starter Connector

OEM replacement 2 pin connector for the GM starter solenoid signal wire. Used on LS series and Holden V8 engines to connect the ECU or ignition switch trigger wire to the starter solenoid. Commonly needed on engine swap builds where the factory harness has...

$20.00

$20.00

Unit price

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Vendor:12Volt Motorsports

Bosch EV1 Connector

Bosch EV1 style 2 pin fuel injector connector. The EV1 is the most widely used injector connector across GM and Holden LS series engines and is also compatible with a large range of aftermarket injectors from Bosch, Siemens Deka, RC Engineering and others. A...

$14.00

$14.00

Unit price

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Vendor:12Volt Motorsports

GM Coolant Temperature Sensor Connector

OEM replacement connector for the GM Engine Coolant Temperature (ECT) sensor. Uses the Delphi Metri-Pack 150.2 2 pin housing as fitted to LS series and many other GM and Holden production engines. Suited to harness repair, engine swap builds and any application where the...

$15.00

$15.00

Unit price

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Vendor:12Volt Motorsports

GM Intake Air Temperature Sensor Connector

OEM replacement connector for the GM Intake Air Temperature (IAT) sensor. This is the Delphi GT150 2 pin connector used across LS series engines including LS1, LS2, LS3 and related Holden variants. Suited to engine swap harness builds and replacement of damaged factory connectors....

$15.00

$15.00

Unit price

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Vendor:12Volt Motorsports

T56 Reverse Lockout Solenoid Connector

OEM replacement 2 pin connector for the GM T56 6 speed manual transmission reverse lockout solenoid. The reverse lockout solenoid prevents accidental engagement of reverse gear at speed and is controlled by the ECU or a dedicated speed-based relay. Commonly required on LS swap...

$17.00

$17.00

Unit price

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Vendor:12Volt Motorsports

GM Alternator Connector | Bosch (Late Model)

OEM replacement 2 pin connector for late model GM PWM controlled alternators. Suits Bosch alternators fitted to VZ, VE Commodore, Gen IV LS2, LS3 and related applications from approximately 2006 onwards. The 2 pin housing carries the L (command) and F (field duty cycle...

$17.00

$17.00

Unit price

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Vendor:12Volt Motorsports

GM LS1 Alternator Connector

OEM replacement 4 pin Delco connector for early GM LS series alternators. Suits the Delco CS130D, AD230 and AD244 series alternators as fitted to VX and VY Commodore, Gen III and early Gen IV LS engines. The 4 pin housing uses the P (pulse),...

$24.00

$24.00

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Vendor:12Volt Motorsports

GM Knock Sensor Connector

OEM replacement 2 pin connector for GM knock sensors. Suits the valley-mounted knock sensors used on LS1 and related Gen III engines as well as the LS2 and Gen IV knock sensor configuration. Also suits the GM reverse light switch connector 90482454. Knock sensor...

$15.00

$15.00

Unit price

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Vendor:12Volt Motorsports

GM Cam / Crank / MAP Sensor Connector | Multi Keyway

OEM replacement 3 pin Delphi Metri-Pack connector for GM camshaft position, crankshaft position and MAP sensors. The multi keyway design means this housing suits several different sensor applications across the LS and Gen III / Gen IV engine family depending on keyway orientation. An...

$17.00

$17.00

Unit price

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Vendor:12Volt Motorsports

Flex Fuel Sensor Connector

OEM replacement connector for the GM Continental flex fuel sensor. Suits Continental flex fuel sensor part numbers 13577394, 13577379 and 13577429 as used in GM and Holden flex fuel applications. The flex fuel sensor reads ethanol content and fuel temperature, providing the signal needed...

$18.00

$18.00

Unit price

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Vendor:12Volt Motorsports

GM Delco Stepper Motor Connector

OEM replacement connector for the GM Delco stepper motor Idle Air Control (IAC) valve. The stepper motor IAC was used on early LS1 and Gen III engines and requires a 4 pin connector for the two winding pairs that drive the stepper. Commonly needed...

$20.00

$20.00

Unit price

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Vendor:12Volt Motorsports

GM VE Throttle Pedal Connector

OEM replacement 6 pin Delphi connector for the GM VE Commodore accelerator pedal position sensor (APPS). The VE throttle pedal uses a dual-track redundant position sensor sending two signals to the ECU for drive by wire throttle control. Commonly used in LS swap builds...

$25.00

$25.00

Unit price

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Vendor:12Volt Motorsports

GM VE DBW Throttle Body Connector

OEM replacement 6 pin Delphi GT150 connector for GM drive by wire (DBW) throttle bodies. Suits the VE Commodore Alloytec and LS series DBW throttle bodies and is also compatible with a range of late model Ford and GM throttle body applications. Widely used...

$23.00

$23.00

Unit price

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