Modified Mustangs & FordsHow To Engine
Holley Avenger EFI - Fuelish Fantasy
Can upgrading to a bolt-on EFI system really be this easy?
This was the perfect system for our subject’s ’66 Mustang convertible. The 289ci V-8 was dolled up with a chrome air cleaner and valve covers, but performance wise it was sporting nothing more than an upgraded distributor and ignition coil. It was stock right down to the iron exhaust manifolds, iron intake manifold, and Autolite 2100 2-V carburetor. The owner was tired of the extended cranking and pedal pumping to get the car going after sitting more than five days. Not to mention it has had four different rebuilt carburetors on the engine in the last few years just trying to get one decent enough to go down the road. Finally, there was the dismal 14.7 mpg he was getting. We felt this was the perfect opportunity to see how well the Avenger system lived up to its sales brochure claims. Check it out in the photos that follow.
|Autolite 2-V Carburetor||Avenger 2-V TBI Fuel Injection|
As mentioned before, this ’66 Mustang got just 14.7 mpg using a 60-mile test run on AFM’s Dynojet dyno. After setting up the EFI and answering the basic yes/no questions on the controller, the Mustang started right up on the first try and after a minute settled into a perfect 750-rpm idle. Some cruising at different throttle positions and different gear selections were performed, and then the Mustang was strapped back down to AFM’s dyno for another fuel economy test. This time the Mustang’s 60-mile testdrive netted 20.8 mpg and this was at 12.6 to 13.2 AFR. Furthermore, we had AFM dyno test the Mustang before and after the EFI conversion just to see if the 289 might improve in the horsepower department and we weren’t disappointed here either, with a gain of nearly 30 rwhp. At wide open throttle, the carb registered 10:1 AFR, while the more accurate EFI was making more power while using less fuel with its indicated 12:2-12:6 AFR.