Corvettes and fuel injection have long been associated with one another. From the early mechanical systems, continuing through the computer controlled electronic systems that followed; fuel injection and Vettes just seem to be made for each other.
Mechanical fuel injection has been around for a long time. It first appeared in the early 1900s on aircraft engines, but most of us are more familiar with the systems pioneered by Ed Winfield and Stu Hilborn as well as the legendary Rochester fuel injection that debuted on Corvettes in 1957.
Although mechanical systems worked well, a big improvement in fuel injection came with the introduction of electronic controls. But it took awhile to get it right. Chrysler introduced the Bendix Electrojector in 1957 with much fanfare and little success. Only 35 cars were so equipped and records indicate dealers replaced most of the trouble prone units with carburetors.
In the mid-’70s, GM introduced Electronic Fuel Injection (EFI) on the Cadillac Seville that used a rudimentary computer. By the ’80s, digital computer controls were introduced and a new era of EFI had begun and it continues to be improved to this day.
As the OEMs continued to refine EFI, the aftermarket responded in kind, and one of the leaders on that front was Ken Farrell. We first met Ken many years ago when he designed and brought to market a self-contained, self-learning throttle-body EFI system. Since then Farrell has joined forces with Jeremy Schmidt and their decades of experience in aftermarket and OEM fuel injection led to the formation of FiTech. Their company produces ECMs for industrial, marine and OE applications. Fortunately for us that lead to easy to install, affordable aftermarket fuel injection systems that use OEM level engineering and components.
FiTech began with basic throttle body kits but it wasn’t long before the product line grew to include systems that would support up to 1,200 horsepower. Systems for dual-quad throttle bodies, nitrous, boosted and even E85 applications are now available. That means there is a system for virtually every carbureted Corvette out there.
Swapping a carburetor for EFI brings with it a number of advantages. Quicker starts, cleaner emissions and better throttle response are often cited as benefits. But the big plus with FiTech’s self-learning system is the ability to establish exact air/fuel ratios for idle, cruise and wide open throttle and letting the ECU take care of the tune-up.
Installing a FiTech throttle body isn’t any more complicated than swapping carburetors. The included wiring harness is clearly labeled and only two sensors have to be installed, the CTS (coolant temperature sensor) in the intake manifold and the O2 sensor (oxygen sensor) in the exhaust system. The ECU (electronic control unit) and the other sensors, the IAC (idle air control) TPS (throttle position sensor) and the MAP (manifold absolute pressure sensor) are incorporated in the throttle body of all the systems.
For the initial setup, all FiTech EFI systems use a unique controller. After inputting a few simple values the Advanced Self Tuning feature makes any adjustments necessary. After initial setup the screen can be configured to display easy to read gauges for monitoring or advanced tuning.
When it comes to selecting a FiTech system here are a variety to chose from and while that may seem confusing at first, the premise is simple—select a system for the horsepower the engine produces and the use the car will see.
Go Street EFI 150-400 Horsepower
Not everyone needs or has 600 horsepower or a wild camshaft. This system is for original engines or crate replacements like the ZZ4. The Go Street EFI is a ready-to-run system that eliminates some tuning functions, such as timing control, while providing the same functions necessary to get the best performance. It uses four 56-lb injectors and the integrated ECU will also control one engine-cooling fan.
Easy Street EFI 150-600 Horsepower
This system is a step up for engines with a more aggressive cam and mild engine upgrades. It uses four 80-lb injectors.
Mean Street EFI 200-800 Horsepower
For high-performance street applications this system includes eight 62-lb injectors and AFR correction capability for use with nitrous systems. It comes with a color touch screen.
Go EFI 4 200-600 Horsepower
This system is perfect for an everyday driver, a weekend cruiser or bracket racer. It features ignition timing control and is equipped with four 80-lb injectors. This system is available in matte black and bright aluminum.
Go EFI 4PA 200-600 Horsepower
The PA stands for power adder, which means this system handles of 25 psi of boost right out of the box and can be used in a blow-through turbo or blower application or on a single roots style supercharger. It will also accommodate a single stage of wet nitrous and control A/F ratios as well as ignition timing. It uses four 80-lb injectors, the ECU will operate two fans and it offers the option to tune with a laptop computer.
Go EFI 8 Power Adder Plus 250-1200 Horsepower
Although this is the ultimate system for serious power builder it will work equally well on a 383-cubic-inch daily driver.
This system features eight 80-lb high-flow injectors, the annular discharge design is increased to 20 jet streams to handle the huge flow this unit is capable of and it comes with data logging and pro tuning software. It will handle 25 psi of boost right out of the box and can be used in a blow-through turbo or blower application or it can be mounted on a single roots style supercharger.
Go EFI 3×2 Tri Power 600HP – External ECU
Looking for something really cool for your restomod Vette? How about FiTech’s brand-new Go EFI 3×2 Tri Power. This system uses three 500-cfm throttle bodies with an external ECU that incorporates all the functions of the Go Street EFI series. The finish on the two-barrel throttle bodes is classic carburetor gold.
Go EFI 2×4 Dual Quad
Nothing says muscle like dual quads and FiTech offers them in several configurations. The EFI 2x4 625-horsepower kit uses one throttle body that handles all of the brains while the second holds four additional injectors and the IAC motor for idle stability. These can also be used in cross-ram and tunnel-ram configurations. This system is available in bright aluminum or matte black.
For 6-71 and 8-71 Roots superchargers or naturally aspirated applications that produce 1,200 hp there is the Go EFI 2X4 Power Adder kit. Boost A/F targets are simple to adjust while timing curves can be retarded according to boost through the touch screen controller. This system is only available in matte black finish.
Fuel Supply Systems
All popular FiTech EFI systems are now packaged with one of four different fuel delivery options: inline fuel pump, Fuel Command Center, Hy-Fuel or G-Surge.
While there are other external pump options as well as in-tank choices, one of the easiest to integrate systems is the FiTech Fuel Command Center. This self-contained unit consists of a fuel tank with a submerged 340-lph pump to supply the fuel injection system. The engine’s original carbureted fuel pump (or a TBI low pressure EFI pump) fills the tank and a float assembly like that found in a carburetor automatically shuts off the fuel flow when the correct fuel level is reached.
Fuel Injection For All Just because your Vette came with a carburetor that doesn’t mean you can’t have all the advantages the latest in electronic fuel injection has to offer. Thanks to FiTech and the array of retrofit fuel injection systems they offer it’s easy to toss that original mixer feed your Vette without carbs. Vette