Holley HP EFI in a miata

[nine lives johnny]

over the last few weeks i installed the system in ls1 miata. got the harness and ecu from holley. we did a wright up on it on the teams web sight.

During the 2011 season, I had raced my LS1-swapped Miata with a stock ECU from a Camaro and an aftermarket wiring harness. Although competitive, this setup proved challenging. My little car was plagued with driveability issues that, at times, kept it off the street. The main issue was that my tune was locked. Any time I needed to get small issues fixed, I paid to unlock my tune and ate up an hour drive out to the shop. On hot track days, I was unable to change the tune, which made me worry about my motor taking the heat. But that worry has now vanished faster then the rear tires on a 16-year-old's Mustang.

I received Holley's HP EFI system with a new LS1 harness. While intimidating at first (as all wiring jobs are), the install was incredibly simple. Holley's claim to fame is that the EFI system "self tunes". They say the ECU is preset with settings that allow it to learn your motor for the best horsepower and gas mileage. I decided to test their claims on the LS1 Miata.