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Time to update the Project 4-Link wiring

This is the Digital Delay Mega Switch panel kit we will be installing. It is built to handle the necessary amps and stand up to the severe vibrations of today's race cars.

The Project 4-Link dragster is probably the most read about project car in history. We have shown hundreds of thousands of readers every aspect of building a dragster: the engine, the transmission and every other phase of racing with a dragster and a Mopar engine.

After two Best Engineered Awards at IHRA Division ET Finals the seven race seasons have brought us to a point where it is time to replace the wiring on the chassis. We have had no real issues but we have added items, removed items, changed from electrical gauges to mechanical, and went from throttle-stop racing to Top Dragster racing. We reached a point where some wires were not needed and we installed a lot of new wires. The end result is that it is getting pretty messy and the wires are not very easy to trace anymore.

Digital Delay’s Charlie Hamma and I discussed this project last summer. He said his company was about to introduce a complete wiring kit, from switch panel, wire, relay and circuit board, delay box and even an LED dial-in board. This was a great opportunity to show a very easy and professional way to wire your race car. Before we get into some pictures and what you can do to prepare for the rewiring let’s go over some basics.

Today’s race cars require a lot of electrical power; can your wiring handle it?

In our own race cars we have tried two 12-volt batteries and, while they worked, they weighed over 65 pounds. We have used a single 16-volt Powermaster battery for two years with great results. For round after round consistency you must have reliable wiring that is up to the task. Digital Delay’s Mega Dial Switch panel is capable of handling 80 amps continuously with peak currents of 100 amps. The Digital Delay Switch Panel is rated at 50 amps continuous with peak currents in excess of 70 amps. Compare this capability to the competition’s switch panels.

If you rate their switch panels the same way here are the results: Painless’s largest switch panel, part #50303, is rated for 14 amps continuous with peak currents of 24 amps. Even the K&R top level Super Duty Switch Panel is rated at 45 amps continuous with peak current of 60 amps.
The wiring has held up pretty well for seven seasons but it is starting to show its age. It has been sprayed with Brake Kleaner so many times I am surprised it is still there.

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