Fuel System Solutions
Each of the EFI systems in this roundup is available with standard or optional high-pressure fuel systems directly from each manufacturer. They feature either in-tank or inline pumps designed to work with your tank, but if you're planning on installing a new fuel cell or have the ability to modify your current tank, Aeromotive offers several appealing options. The most complete solution is Aeromotive's Stealth fuel cell, which is available in 6-, 15-, and 20-gallon configurations. These aluminum tanks have high-volume pumps and baffles built right in, so all you have to do is hook up two fuel lines and the power and ground wires. Aeromotive also offers these same pumps along with universal baffles that can be mounted inside just about any gas tank—no welding required. For those who want a more factory appearance, Aeromotive has recently launched a brand-new line of muscle car fuel tanks that are direct replacements for applications such as first-gen Camaros, Tri-Five Chevys, and '64-72 GM A-bodies. They feature a high-volume Stealth pump mounted in the tank, and can support up to 1,000 hp.
Just like carburetors, throttle-body EFI systems start the fuel atomization process right below the throttle blades. Multipoint EFI, on the other hand, injects fuel into all eight intake runners. Doubling the number of fuel injectors also doubles horsepower capacity. Fortunately, should you ever outgrow the horsepower limit of your self-learning TBI-style fuel-injection system, it's easy to upgrade to a multipoint setup. FAST and Holley both offer conversion kits that include a new intake manifold, throttle-body, fuel rails, injectors, and wiring harness. This allows the multipoint hardware to interface with the same self-learning ECU and handheld controller as used in the base TBI systems for a seamless transition. Of course, for those who know that their engine combination will exceed the horsepower capacity of a throttle-body EFI system from the get-go, both companies offer turnkey multipoint systems bundled together with their self-tuning ECU and supporting hardware.
EZ Eight Stack
Individual-runner induction systems don't just look sweet, but thanks to their arrow-straight runners and ability to reduce reversion with big cams, they also yield phenomenal performance gains over common-plenum intake manifolds. The problem is that the eight Weber carbs attached to them have always been little demons to tune, but with FAST's EZ-EFI, all that's changed. Inglése already offers eight-stack induction systems for small- and big-block Chevys and Fords, and since Inglése and FAST are both part of the COMP Cams family, it was only natural to combine individual-runner intakes with EZ-EFI. To facilitate this harmonious match, Inglése offers wiring harnesses that connect the injectors and engine sensors to the EZ-EFI computer and handheld controller. Check out www.Inglese.com for more details.
Faster Processors, Faster Cars
To put the scope of self-learning EFI technology into perspective, we only need to look back at the severe limitations of factory fuel-injection systems from just a few years ago. Since these computers were too slow to react in real time at wide-open throttle, they simply ignored pertinent engine load and air/fuel ratio data from the engine sensors. Instead, they relied on a static, preprogrammed fuel map and could make only minor corrections to the overall air/fuel mixture. In contrast, modern self-learning EFI systems are so fast that they can instantaneously change the base fuel map at idle, part-throttle, and WOT. "Today's ECU processors are substantially faster than those from just a few years ago. Their speed combined with their processing power enable them to make quick and precise closed-loop fueling changes for robust self-learning functionality," Bill Tichenor of Holley explains.