With the complexity of factory OEM fuel injection systems, Custom Chrome in partnership with Techlusion felt it was important to provide owners with a product that is easy to operate, install and understand while not upsetting the stock fuel curve, or timing. This new DFO Box (Digital Fuel Optimizer) is just that animal. By attaching itself to the injector trigger wires and controlling fuel delivery as the signal travels to each injector the DFO box allows all the stock sensors and inputs to function just as the factory designed, whether it faces late or early fuel injection systems.

The DFO box operates like jet kits for carbureted engines, which normally change ranges of fuel at the main jet, needle or idle mixture. It allows you to make low rpm/cruise fuel changes as well as high rpm/ acceleration demand adjustments. The difference is that now an electrical signal changes the demand for fuel and not vacuum or pressure. The DFO Box also affords the rider quick and simple adjustments with the turn of a screwdriver.

In addition the DFO Box allows for accelerator pump adjustments electronically to enhance throttle response. We watched as this unit was installed at the Joker Machine Dyno facility and tested. In addition a shop owner, Mike Ingle from Grease Lightening was there to witness the product being applied and tuned. He was in the process of installing Power Commander units and immediately put the DFO unit to work on a customer's bike. Since then he has installed two more units.

"There's a couple of basic differences between the Power Commander units and the DFO box," Mike said. The DFO unit is easy to install and inexpensive. It basically adds fuel to the mixture. The average guy can install this to a bike with basic modifications and tune it readily. It's designed for any builder who changes pipes, air cleaners or makes minor mods to his engine. It does not mess with the timing."

"The Power commander units modify the timing and will add or subtract fuel for heavier modified bikes and massive-inch engines. They are more costly and require more time, equipment and expertise to install. You must have a current dyno and an exhaust gas analyzer to set up a Power Commander properly, said Mike."

Mike pointed out that the three maps supplied with the power commanders rarely work because the motorcycle must be modified exactly to fit the mapping. "The first DFO Box I installed was on a '95-inch Twin Cam unit with stock compression. We were able to get 90 horses out of it with 105 pounds of torque. That's not bad."

The DFO box has four simple adjustments and can be readily adjusted by the rider with test rides. Custom Chrome is the exclusive distributor of this unit which has become the RevTech answer to fuel injection mods.

In the near future the past editor of Hot Rod Bikes, Frank Kaisler, will post his findings on this unit at the Joke Machine facility. Stay tuned for more info.

--Wrench