Fuel Air Spark Technology - EZ-EFI

I can't stress enough there's no need for a laptop computer for tuning. This little doodad here is what they call the user interface, and it's loaded with some software that basically asks you a few easy to answer questions that set the system's baseline, and from there EZ-EFI just tunes itself as you drive.

This is one of the ancillary accessory packages. It's the electric fuel pump kit, complete with a pump, pre-filter, regulator and gauge, mounting hardware, wiring, high-pressure hose, and fittings.

Another available option package is a high-pressure fuel line and fitting kit. This will give you what ya need to plumb in a fuel return line setup. I was at first concerned with the whole return line requirement, thinking that it'd be a hassle modifying the gas tank. Brian from FAST told me all one needs to do is run a return line back to a spot behind the fuel pump and add a T fitting in the line from the tank to the pump. As long as the returned fuel is behind the pump it'll just take that returned fuel and push it back up to the throttle body-no tank mods required!

The only setback in the whole installation that I could see the average home installer running into might be welding the O2 sensor bung into the exhaust pipe. The kit includes a bung assembly that has a thread-in plug that goes along with it. So, those that don't have a welder can swing by the local muffler shop and have them drill and install the bung. Once installed ya just thread the cap in for the drive home and then replace the cap with the sensor included in the kit.

Heck, they even supply a diagram showing the installation angle required for the O2 sensor too.

Now the guys at Westech tag-teamed this install and start to finish had the system installed and ready to fire in about 20 minutes or so. But, as you can see, that was with three guys and an engine on a dyno stand. That said, I'd guess that even a carbman like me working under the hood in my own garage could do the job and have the car up and running in a weekend, without a problem.

One thing the EZ-EFI system does require is an engine speed input, but that's not a problem either 'cuz there's two ways to accomplish this. First, if you're running an aftermarket CD ignition box all ya do is plug in the wire marked "TACH IN/RPM MODULE" from the EZ-EFI harness into the tach output of the CD box. If you're running traditional OEM style ignition there's a FAST rpm module (shown here) that connects to the negative side of the coil and outputs a signal to the ECU.Note: HEI distributors (and possibly others) do have a terminal labeled "TACH." But, that's not a clean, processed tach signal like an aftermarket ignition box would supply. Instead, it's simply another terminal connected to the negative side of the coil. Do NOT connect that terminal directly to the "TACH IN/RPM MODULE" wire in the wiring harness. The ECU may be damaged. In a case like that, Option 2, using the RPM module, is required since what you are really doing is connecting to the negative side of a dwell-controlled coil.

Another thing I like about the EZ-EFI system is the 4150-style throttle body, it's got an unassuming carburetor look that'd even be pretty much at home in a moderately traditional style engine, especially when paired with a carb-style standard air filter assembly. The wiring harness isn't outlandishly large or complicated either. The few hookups are plainly labeled and the ends terminate in OEM-style weather-tight plugs.

As I said earlier, the basic kit includes the sensors (like the O2 sensor I mentioned and the temp sensor shown here) but nothin' exotic or complicated.

The handheld interface is not much larger than a pack of smokes. Luckily for me it has only three buttons and the Setup Wizard software it contains just asks ya to punch in some simple info and to answer a few easy questions. If it didn't confuse me then it ought to be a piece of cake for the rest of earth's inhabitants.

Since this installation took place in the dyno lab rather than the driveway the guys just had me follow the prompts on the interface and we fired the engine up. They ran the test in break-in mode allowing the engine to come up to temp and then run through some various rpm ranges. As the engine ran the ECU monitored the input from the sensors and in a minute or two began to self tune. After a little while it was all memorized and the engine ran like a clock through many a pull, and started almost instantly at the touch of the ignition.Like I've said, until now I'd have never thought I'd entertain the thought of equipping any of my hot rods with EFI, but now I'm not so sure. After watching (and being involved in) this demo I'm seriously thinking of going the injection route in the near future. Hey, the good drivability, performance, and better gas mileage fuel injection offers was always something I'd wanted in a hot rod.