I'm of a particular generation. Well we all are, actually. But mine is the one whose auto shop teacher proclaimed that fuel injection would take over everything. And we found that patently comical. Fuel injection was more than just complex and costly back when Reagan was in office; it was entirely out of the realm of the garden-variety enthusiast. Sure, a few people whittled down OEM systems to work stand-alone; however, they were completely at the mercy of the few people in the country who could burn chips to make their systems work with relatively limited modified engines. So to us there was only one question: how on earth could fuel injection replace the simple and inexpensive carburetor? I mean, the idea sounded great and all but none of us were getting our hopes up about it coming true.
Well, brothers and sisters, we can officially say it happened: the day of simple and inexpensive fuel injection is here.
There was a sort of watershed moment at the 2015 SEMA Show. Three companies introduced 13 very affordable throttle body retrofit kits, many of which require no more than a couple of utterly simple programming entries. Though significant in its own right, the technology wasn't the big news (self-learning injection dates back about half a dozen years). No, what truly stood out was the tipping point that the moment represented. Those 13 new products represent a 325 percent increase over the prior year! As impressive as that was, it almost paled in comparison to one more thing: three self-learning port-injection and several throttle body kits came in below the $1,000 barrier. And as incredible as that seems, one of those kits costs about what a high-end performance carburetor runs these days.
Too good to be true?
There's real substance behind these claims. In a nutshell, most engines behave pretty consistently within a fairly broad spectrum of tune. It explains why a universal performance carburetor can make most engines run well enough on most engines to satisfy all but the pickiest of enthusiasts. In oversimplified terms, manifold pressure, engine speed, throttle input, and air/fuel ratio tell us what the engine really needs. So, in grossly oversimplified terms, the manufacturer has to create a generic fuel map to meet those parameters.
But this is where the right cross follows the left jab delivered by the generic tuning. The brains in this new generation of ECU constantly read the sensor parameters and—this is the technology that sounds as if it came straight from a rogue-robot film—learn the engine's needs. So the ECU makes a note of every hiccup and changes the parameters in that area so it doesn't happen again. Crazy, huh?
There are a few consistent elements among these systems. All of these systems control idle speed inasmuch as they maintain a user-set target speed. However, some of the advanced kits bump engine speed when the A/C clutch engages. Some systems are able to control a single cooling fan whereas others can control dual fans independently. The ones that control fans require external relays for fan operation. Some even control dual fans independently based on various parameters.
These aren't just oversimplified carburetor conversions; they're all incredibly sophisticated devices and some boast quite advanced features. For example, a number accommodate nitrous-oxide injection inasmuch as they alter timing and in some cases the fuel curve by user-set parameters. In fact, a few can control staged nitrous systems by numerous conditions like engine speed, manifold pressure, and throttle input. But all of the nitrous-friendly models require wet systems that inject their own fuel. Some systems have the capacity to drive the entire ignition system using the distributor only to send the spark to its intended plug; however, all are capable of operating as fuel controllers exclusively. The ones that control the ignition system can drive the coil directly or through an auxiliary ignition box like a multi-spark, capacitive-discharge system.
A few systems in this lineup boast Controller Area Network (CAN) technology. It's a busing standard that lets various controllers in a system communicate with each other by way of a simple cable in a daisy-chain network. These systems accommodate other CAN-enabled components in a company's catalog, most notably but certainly not limited to controllers for electronic transmissions like 4L60E gearboxes. They also communicate with other companies' devices like gauge packages. One goes so far as to communicate with a vast array of components that use CAN technology, be they aftermarket or OEM. And while some are E85 compatible, understand that it comes with the penalty of reduced power, an inevitable shortcoming that has nothing to do with the fuel-delivery system.
What follows are what we consider the 18 most significant fuel-injection conversion systems—13 of those coming from the 2015 SEMA Show—and a truly unique problem-solving fuel controller. We also put together a chart to explain the various features at a glance.
This is a significant step in our industry's evolution that puts enthusiasts at an entirely new crossroads, whether to keep one foot in the past or to take another step into the future. If only I had a time machine so I could go back and tell my teen-aged self. Well scratch that; I would've wasted decades wanting this day to come.
Edelbrock made an early entry into the EFI world in the 1990s, really not too long after it started manufacturing carburetors. For E-Street 2, its latest self-learning injection system, it called upon Magneti Marelli, one of the larger ignition and fuel-delivery vendors in the OEM world.
E-Street 2 boasts a number of premium features like A/C idle control and spark control. It offers one feature exclusive in the field: Bluetooth connectivity with Android-based devices. This lets Edelbrock offer each main kit in one of two ways: with or without a color touch screen programmer. Either the programmer or your own Android phone or tablet can be used to configure the system. The programmer or Android device displays a virtual dashboard of gauges and can be used to also alter various values for setup. Though entirely optional, a laptop can also alter the various settings.
We listed the main system (PN 3664) without the fuel-delivery system but Edelbrock offers E-Street kits with two fuel-delivery options. Part number 3665 includes the 3664 kit with a return-style fuel-delivery system. Part number 3667 includes the 3665 kit with a universal EFI sump fuel kit.
To call FAST one of the founders of the modern fuel-injection movement is a bit of an understatement. A second-generation ECU manufacturer, it initiated a revolution as significant as the stand-alone ECU was to the prior generation. Those systems may have given us injection but FAST gave us an altogether higher level of sophistication, power, and—most importantly—accessibility. They made tuners out of mere mortals.
FAST once again revolutionized the industry with a self-learning, plug-and-play ECU in 2009. More than the first on the market, it was the first to employ CAN technology. This technology lets FAST systems interface with other CAN-enabled components by a single plug, at which point they communicate seamlessly. Though the system is proprietary, FAST shared its CAN addresses with gauge manufacturers who offer CAN-enabled components. Most dyno manufacturers can also interface with these systems to record data straight from the ECU.
The company offers the kits seen here with single throttle bodies but offers duals as an option. Triggering a wet nitrous system initiates a user-set spark retard. Additionally, they can transform to accept E85 fuel by a simple change made in the handheld module. But the real news is the convertible nature of the ECUs; they will just as easily drive port injection systems, making system expansion much more affordable. In fact, FAST offers a multi-port variation of the plug-and-play design using the same EZ-EFI ECU.