Supra Wiring Overhaul and Tune

Tuning and engine building are two specialties that we pride ourselves in, but wiring is an important factor of any heavily modified setup, and is often overlooked. Many of our projects, such as this customer’s Supra, involve cleaning up areas which may have been overlooked by other shops, or simply done incorrectly. This particular car has all of the right parts to go fast, including a 76mm turbo and TH400 3-speed automatic transmission, but could never complete a quality pass at the drag strip due to problems. Upon diagnosing what the car would need, we found an absolute monstrosity of wiring from the engine bay, interior, engine management, and into the trunk for the fuel system and nitrous.

The car’s owner requested that the entire electronics system of the car be re-wired. We started by cutting out the majority of wiring, including wires that were spliced, twisted, soldered and taped together more than 15 times in three feet.

The outdated Autronic EMS was removed in favor of the new Haltech Sport 2000 engine management system, paired with a M&W Pro Ignition box. A Mil-spec engine harness was fit to the car, and the remaining systems, such as nitrous, fuel, and fans, were also professionally wired in-house.

Shown is the dash layout nearing completion.

After a dyno session on low boost and one small stage of nitrous, the car was loaded into our trailer and off to the drag strip to be delivered to the customer, eagerly waiting to make a pass. We were only able to get in two passes before the track closed for the night, and the first was just a shake-down run to get a feel for the car. The second pass was a bit more aggressive, and the car crossed the quarter mile finish line in the 10-second range with ease.

Stay tuned as we turn this Supra up to it’s potential and see it dip deep into the single digits!