The problem it solves
In a traditionally wired race car, every powered device has its own path: a fuse, maybe a relay, maybe a circuit breaker, all spread across one or more panels. Add a few more devices and the wiring grows into a rat's nest that's heavy, hard to trace and full of connections that can loosen.
The Racepak SmartWire takes a different approach. It's a programmable power control module that becomes the central hub for the car's electrical system. The battery feeds the SmartWire directly, and every circuit is run from the module instead of through separate fuses and relays.
How it works
- Solid-state switching. There are no mechanical relay contacts to wear or bounce, so outputs react faster, and fewer components mean less weight.
- Software-defined channels. Each input and output is set up from a PC over USB: what it does, how much current it's meant to draw, and at what current it should shut off. That replaces the fuse, the relay and the breaker for that circuit in one step.
- Feedback. It reports voltage, current and state for each channel, so you can see a failing pump drawing more than it should before it quits.
Switch panels
For driver controls, an optional eight-switch panel or a 16-channel switch module connects to the SmartWire through one small cable, rather than a thick loom of switch wires. If you need more switches, a jumper cable adds a second panel.
Specifications at a glance
| Item | Spec |
|---|---|
| Output channels | 30 total: 8 rated up to 20 A, 22 rated up to 10 A |
| Hardwired switch inputs | 12 |
| Total capacity | 125 A |
| Data output | Volts, amps and state |
| Response time | 3.0 ms |
| Programming | USB |
| Size | 6 x 5.5 x 1.5 in |
| In the kit | SmartWire module (P/N 500-KT-SW30), software, connector kit and USB programming cable |
Where Haltech fits in
The SmartWire has a CAN port and works with a range of Haltech devices, so it can share information with Haltech ECUs, dashes and I/O expanders. Racepak also describes compatibility through its VNet system. In practice that means the ECU stays in charge of engine control, the SmartWire handles power distribution, and the two can see each other's data on the network. It suits circuit and road race cars as well as drag cars, where fast, reliable switching and fewer failure points matter most.
Planning a power system
Whether you use a SmartWire or conventional fuses and relays, the same rules apply:
- List every powered device and its real current draw, including start-up current for pumps and fans.
- Keep high-current loads off ECU outputs. Our relay guide explains why.
- Get grounding right from day one. See ECU grounding dos and don'ts.
- Plan your CAN network before you start routing wires, so every device has a sensible home.
More wiring tips live in Dave's wiring vlog. If you're planning a full race car electrical system around a Haltech ECU, book a free consultation and we'll help you map it out.
FAQ
Does a SmartWire replace my ECU?
No. It manages power to devices; the ECU still runs the engine. They work together over CAN.
Do I still need fuses?
Each channel has its own programmable current limit, which takes the place of a fuse for that circuit. For the main battery feed, follow Racepak's installation instructions.
