In an EFI system, we find...
In an EFI system, we find a throttle body in the location normally occupied by the carburetor. The throttle body only meters the air flow into the engine, and handles none of the fuel.
Is there EFI in the future of your seasoned Vette? It's pretty hard to ignore the drivability of modern systems that continually adjust the fuel and spark to their optimal settings as you drive. Equipped with modern controls, you're practically rolling down the road with an ace tune-up man wrenching away under the hood at all times. An expertly calibrated fuel-injection system can eliminate the temperamental nature that some carbureted installations can exhibit, and make driving the pleasure it was intended to be. Everything you need is readily available from EFI specialty companies such as FAST, so what are you waiting for?
Serving as the "brains" of...
Serving as the "brains" of an EFI system is the electronic control unit. The new FAST XFI box is a state-of-the-art aftermarket engine control system with greater flexibility and more user-friendliness than ever before. Changes to the hardware and accompanying software expanded the capabilities of the system, allowing control over the full spectrum of engine fuel and timing functions, as well as auxiliary outputs to control a variety of additional devices, including everything from torque converter lock-up to fan actuation. Multiple LED's on the FAST XFI box confirm inputs from crank, cam (if applicable), ignition trigger, and power, while a second series shows cylinder firing output.
| Difficulty Index ::: |
| ANYONE’S PROJECT |no tools required | 1 |
| BEGINNER |basic tools | 11 |
| EXPERIENCED | special tools | 111 |
| ACCOMPLISHED | special tools and outside help | 1111 |
| PROFESSIONALS ONLY | send this work out | 11111 |
Dyno Results
Carb vs. EFISuperflow 901 Engine Dyno Tested at Westech Performance Group STP Correction Factor
Any electronic brain needs...
Any electronic brain needs information on what is going on at the engine to decide what output parameters to send to the ignition and fuel systems. the engine sensors accomplish this. At the throttle body, we have the throttle position sensor, which simply informs the XFI box how deep you've stabbed the go pedal. Hook-up to all the sensors is simplicity in itself-it just plugs in and is clearly labeled.
Another temperature sensor...
Another temperature sensor is the inlet air temperature sensor (IAT), which makes the XFI control unit aware of the temperature of the air entering the engine. Air density changes with temperature, and the IAT sensor lets the ECU know the conditions at all times. Typically, this sensor is put into the air cleaner or elsewhere in the air inlet stream to the engine.
Another one of the key sensors...
Another one of the key sensors is the coolant temperature sensor. It simply screws into the water jacket at a convenient point (in this case, the intake manifold) and provides the engine temperature information to the XFI control box.