Making Connections

Project T-top Coupe: We install a Terminator X Max for big power.

- KJ JONES

Since its initial build in 2007, Project T-top Coupe's Paxton Novi 2000 supercharged, 350ci small-block Ford engine has been electronically fuel injected and operated by a then state-of-the-art, stand-alone engine-control unit and the tuning wizardry of Brian Macy of Horsepower Connection in Lake Havasu, Arizona.

Since those early years, companies have made notable advancements in high-performance fuel injection. Holley is one of those brands, and at this point, its top-of-the-line Dominator EFI is recognized as one of the leading multiport fuel-injection systems in the space. It's a veritable do-everything setup that is most notably used on the outlaw small- and big-tire rides that are wildly popular right now. Naturally, as the big dog in Holley's EFI ranks, Dominator is the most expensive unit.

Holley's HP EFI slots in the product lineup just below Dominator. Although they use the same software and main wiring harness and can support low-or high-impedance fuel injectors, only the Dominator has two oxygen-sensor inputs and the ability to control certain drive-by-wire throttle-body applications. Holley Dominator EFI also can control certain electronic transmissions (GM 4L60E/4L80E, Ford AODE/4R70W) that the HP does not support. Finally, Dominator has 18 more high-side 12-volt inputs than HP, 14 more low-side 12-volt inputs, 9 more multi inputs, 6 speed inputs, and 30 0-5V sensor inputs. That's a lot of scramble buttons, bump boxes, and any other tricks and gadgets that can be added to a race car.

As Holley EFI systems go, Dominator is exactly that-dominant. The HP is less expensive, but is a great alternative for applications that don't require as many accessory inputs.