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Fuel Injection Kits to Replace Your Carb

Posted in How To: Engine on October 25, 2016
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The carburetor was invented well over a century ago and served the internal combustion engine well. Later, electronic control was married to carburetors with so-so results. Okay, the results were actually horrible. Then, when electrically actuated fuel injectors took the place of the traditional venturi carb, performance improved immensely. The ability to more precisely control fuel mixture over temperature, atmospheric pressure, and rough terrain was a huge boon to four wheelers.

These days, new vehicles come from the factory with some form of electronic fuel injection (EFI). Luckily, if you drive an older carbureted rig or are building up your own engine, you have a wide array of aftermarket choices of EFI. The majority of systems listed here are targeted towards V-8 engines, with some four- and six-cylinder options for a few applications. Approximate street prices are listed. Note: Not all systems are street emissions legal.

Almost all systems include an electronic control unit (ECU) or electronic control module (ECM), which is the brain of the system. The most common system types are Throttle-Body Injection (TBI) or Multi-Point Injection (MPI). We've tried to describe what is and isn't included in each system, but know you'll often have to source some additional parts such as an air cleaner, throttle linkage, or transmission interface when making the swap from a carburetor to an EFI system.

Affordable Fuel Injection (AFI) TBI System

Overview: TBI conversions have been AFI's mainstay product line, using a repurposed GM TBI unit and ECM for most applications. Their setup allows full fuel and spark advance control for most engine combinations. This offers an economical alternative to a troublesome four-barrel carburetor using a relatively simple, reliable EFI system. This is essentially GM's well-proven OEM TBI system.
Includes: Rebuilt GM TBI unit & ECM, sensors, harness, manifold adapter, distributor, fuel pump
Additional Parts Required: Fuel lines
Fuel Pressure: 9 to 13 psi
Special Considerations: Adapter plates can also mate to two- and one-barrel intakes
Price: $900-up (approx.)
Source: Affordable Fuel Injection, 248/393-1621, affordable-fuel-injection.com

Affordable Fuel Injection (AFI) MPI System

Overview: Multi-Point Fuel Injection conversions are a step up from the TBI systems AFI offers. It provides the components needed to run a closed-loop GM-style system. Electrical installation requires only three wire connections (ignition, battery, and ground). A replacement intake manifold is provided, along with a two- or four-barrel throttle body based on engine application. The systems will soon be upgraded to operate with GM LS electronics.
Includes: Intake manifold, throttle body, fuel pump, fuel rails, injectors, regulator, ECM, sensors, harness, distributor
Additional Parts Required: Fuel lines
Fuel Pressure: 40 to 47 psi
Special Considerations: Can add heated O2 sensor or electric fan control
Price: $1,900-up
Source: Affordable Fuel Injection, 248/393-1621, affordable-fuel-injection.com

Chevrolet Performance Ram Jet Fuel Injection

Overview: Multi-point fuel-injection speed-density system. Designed for small-block Chevy applications with Vortec cylinder heads. Must be combined with an aftermarket wiring harness and programmed engine computer.
Includes: Intake manifold, throttle body, fuel rails, injectors, fuel regulator, distributor, ignition coil/wires
Additional Parts Required: Programmed ECM, aftermarket harness, fuel system, O2 sensors
Price: $1,900 (approx.)
Source: Chevrolet Performance, chevrolet.com/performance

Edelbrock E-Street EFI System

Overview: TBI-style fuel injection kit that uses a pre-installed interface on a supplied touchscreen tablet PC. Allows the user to fine tune, make adjustments, and monitor system performance without a laptop. Supports up to 600 hp. Utilizes a wide-band O2 sensor and is self-learning as vehicle is driven. Compatible with popular ignition systems and distributors. ECU can control two fans, and tablet can display monitoring gauges.
Includes: TBI unit, ECU, touch screen tablet PC, harness, sensors
Additional Parts Required: Fuel supply system of choice
Fuel Pressure: 49 to 58 psi
Price: $2,200 to $2,700 (approx.)
Source: Edelbrock, 310/781-2222, edelbrock.com

Edelbrock Pro-Flo 2 EFI System

Overview: Sequential EFI system available for a wide range of applications, including small-block and big-block engines. Uses a flash-programmable ECU and a graphic user interface on a handheld calibration module to program with or without a laptop. Offers two tuning strategies: speed density (engine speed versus manifold absolute pressure) and alpha-N (engine speed versus throttle position). Can work with a narrow-band (included) or wide-band O2 sensor.
Includes: Intake manifold, throttle body, fuel rails, injectors, ECU, harness, sensors, handheld calibration module
Additional Parts Required: Fuel supply system (included in some kits)
Fuel Pressure: 50 psi (approx.)
Special Considerations: Includes Mallory distributor for some applications
Price: $3,500 to $4,200 (approx.)
Source: Edelbrock, 310/781-2222, edelbrock.com

Edelbrock Pro-Flo XT EFI System

Overview: Multi-port fuel injection system available for small-block and big-block Chevy and big-block Chrysler engines. Has forward facing throttle body assembly. The system uses the speed-density method of electronic engine management and is highly tunable.
Includes: Complete intake manifold with injectors, fuel rails, throttle body, ECU, harness, handheld calibration module, Mallory distributor
Additional Parts Required: Fuel supply system (included in some kits)
Fuel Pressure: 50 psi (approx.)
Special Considerations: Offered in various stages with increasingly larger injectors to support high horsepower applications
Price: $3,900 to $4,300 (approx.)
Source: Edelbrock, 310/781-2222, edelbrock.com

FAST EZ-EFI System

Overview: Self-Tuning TBI kit capable of servicing engines up to 650 hp. Bolts to existing intake manifold. A setup wizard on a handheld unit guides user through start-up, and the kit tunes itself while being driven. Works with original carb-type distributor, Holley-style throttle linkage and four-barrel intake manifold. Utilizes common GM sensors and a wide-band O2 sensor. Jeep specific models available, plus dual-quad and multi-port EFI versions. Works with all ignition systems, including HEI.
Includes: TBI unit, ECU, harness, sensors, handheld unit
Additional Parts Required: Fuel supply system of choice
Fuel Pressure: 40-plus psi
Special Considerations: Intake manifold adapter supplied for Jeep CJ/YJ applications
Price: $1,700 to $2,400 (approx.)
Source: FAST, fuelairspark.com

FAST EZ-EFI 2.0 System

Overview: Self-Tuning TBI kit capable of servicing engines up to 1,200 hp. The updated Version 2.0 continues the practice of setup without the need for a laptop or tuning trial. The system uses eight injectors and includes ignition timing control. A color touchscreen handheld unit is included that provides on-board diagnostics. Works with return or non-return fuel feeds and most common ignition systems.
Includes: TBI unit, ECU, full harness, sensors, handheld color touchscreen
Additional Parts Required: Fuel supply system of choice
Fuel Pressure: 40-plus psi
Special Considerations: Greater precision when combined with a FAST distributor or crank trigger
Price: $2,300 to $3,600 (approx.)
Source: FAST, fuelairspark.com

Holley Terminator EFI System

Overview: This TBI system utilizes a four-barrel throttle body that flows up to 950 cfm to support engines from 250 to 600 hp. The system is fully self-tuning, with no laptop required. It provides ignition timing control on engines with small-cap GM HEI and Ford TFI distributors (with adapter). Fits all standard flange intake manifolds.
Includes: TBI unit, ECU, handheld controller, harness, sensors
Additional Parts Required: Fuel supply system of choice
Fuel Pressure: 45 psi (approx.)
Special Considerations: Terminator ECU can be easily updated to Holley HP ECU specs for use with LS, boosted, nitrous, and other applications.
Price: $2,000 (approx.)
Source: Holley, 866/464-6553, holley.com

Holley HP Multi-Port EFI System

Overview: A step up in the Holley line is their HP MPI four-barrel injection system. System has self-tuning capabilities and is programmable with a laptop or the optional color touch-screen unit. Kits are offered for GM LS applications, older small-block and big-block Ford, Chevy, Mopar, Mod Motor, and Ford Coyote, plus late-model Hemi engines.
Includes: Intake manifold, billet throttle body, fuel rails, ECU, harness
Additional Parts Required: Fuel supply system and injectors of choice
Fuel Pressure: 44 psi (approx.)
Special Considerations: System can support boost control, progressive nitrous, water/methanol injection, etc.
Price: $2,800 to $3,300 (approx.)
Source: Holley, 866/464-6553, holley.com

Megasquirt DIY EFI Components

Overview: For those that like to delve into building their own systems, Megasquirt EFI systems may meet that need affordably. DIYAutoTune offers the ability for customers to piece together their own EFI and ignition control systems, even assembling your own circuit boards, if you like to solder. The systems are highly programmable and can be a basic TBI setup or more complex MPI system with full engine management capabilities.
Includes: Varies by customer choices
Additional Parts Required: OEM or aftermarket intake, injectors, throttle body
Fuel Pressure: Depends on system
Special Considerations: Can provide progressive nitrous control, boost control, rev limiters, fan control
Price: Varies by customer choices
Source: DIYAutoTune, diyautotune.com

MSD Atomic EFI System

Overview: This TBI-based system was designed to be simple to install and set up. It is self-tuning and requires no laptop for interfacing. A hand-held controller provides the user interface to the system and can serve to monitor engine parameters in real time. The Atomic is capable of operating with a return or non-return fuel system.
Includes: Throttle body, power module, handheld controller, harness, sensors, standard fuel kit (some kits)
Additional Parts Required: Fuel supply system of choice (some kits)
Fuel Pressure: 42 psi (approx.)
Special Considerations: Boost and wet nitrous ready (blow-through or draw-through)
Price: $2,400 (approx.)
Source: MSD, msdperformance.com

Professional Products Powerjection III

Overview: Designed as a replacement system using throttle-body injection. Supports up to 550 hp. It has the adaptive-learning engine management system (EMS) built into the throttle body. Laptop programmable. System can control spark timing. Can be used with return or non-return fuel systems. Comes as a base kit or complete kit with fuel supply components.
Includes: TBI unit, EMS, harness, sensors, no-weld oxygen sensor bung
Additional Parts Required: Fuel supply system of choice (if not complete kit)
Fuel Pressure: 45 psi (approx.)
Special Considerations: Minimal external wiring and throttle body designed to look similar to a carburetor
Price: $1,700 to $2,200 (approx.)
Source: Professional Products, 323/306-5067, professional-products.com

Quick Fuel EFI System

Overview: The QFi fuel-injection comes in a base kit or master kit. The throttle body utilizes a unique 8-hole venturi said to provide superior fuel atomization when compared to traditional injector nozzles. Accommodates engines up to 575 hp. Uses adaptive learning. Programmable with provided handheld controller or laptop. Has on-board ignition driver and timing controlled by ECU. Utilizes common OEM sensors.
Includes: TBI unit, ECU, handheld controller, harness, sensors, laptop cable
Additional Parts Required: Fuel supply system of choice (if not master kit)
Fuel Pressure: 40 to 45 psi
Special Considerations: Compatible with wet-flow nitrous, superchargers, and turbochargers
Price: $1,900 to $2,200 (approx.)
Source: Quick Fuel, 270/793-0900, quickfueltechnology.com

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