Here’s the stock 307 motor as it appeared when I originally picked up the truck a few mont
Given the current price for a gallon of gas in Southern California ($4.55 as this goes to print!) and elsewhere in the good ol’ US of A, there’s no better time than now to make that old gas guzzling pickup truck a little more efficient. And let’s face it, given our truck’s size, weight, and overall lack of anything reflecting aerodynamics, we can use all we can get. Enter the world of computer-controlled throttle body fuel injection or TBI.
While it’s true that TBI setups have been around for over twenty years, the technology that it takes to make a truly plug-and-play system that can be transplanted to any old V-8 is fairly new. Even more recent is the development of electronic control units or ECUs that have a self-learning capability. Just a few years ago, if one wanted to upgrade to a fuel injected system, it meant hooking up a laptop to the ECU in order to program it to fit the particular application. This required either a fairly competent understanding of the fuel system on the part of the end user or their ECU be ‘flashed’ by a third-party. For us carb guys, that was like speaking Greek in a Cajun accent.
Well, remember those videos in your science class where the guys in the white lab coats dithered away in front of trailer-sized computers? Years late, all that tweaking resulted in computer systems that can figure out the program needed by taking parameters from a given set of sensors on an engine, and make changes to the fuel program on the fly. Simply put, the geeks figured out how to tune an engine better than the gearheads! No offense to any self-professed geeks of course.
This is the 700-cfm TBI Avenger assembly with 65 lb/hr injectors. Those two black plastic
That’s great news to any of us old die hards who tune a carburetor using instincts and a screwdriver but are sick of the poor gas mileage usually associated with the old fuel dumpers. And I fall into that category to be sure. I’ve always been a stalwart supporter of a mechanical carburetor and the ability to diagnose a problem when it reared its head. Then I got to thinking; My wife’s Toyota is completely computer controlled, as was my Ranger pickup and neither of them had ever left us stranded. They fired right up when it was cold and got pretty good gas mileage to boot. I never had to adjust the floats, change the jets, or the accelerator pump settings either come to think of it. So, why not give that technology a try on our project ’68 C10? I couldn’t think of a good reason not to.
And so, with that optimism on my mind, I tore into the induction system with furious abandon, swapping out the 650-cfm carb with Holley’s Avenger EFI system.
The brains of the whole EFI operation is Holley’s Avenger EFI ECU and hand held controller
The installation of a throttle body injection system on an engine that’s already equipped with a four barrel carb is pretty straight forward since the TBI simply takes the place of the carb. There are, however, a few things necessary for an EFI setup that isn’t for a standard carb system. For one, a return line must be used with Holley’s Avenger EFI kit. This is pretty straight forward however and the ease of this addition really comes down to each particular application. If you’re building a truck from the ground up, it’s easy to order a tank with a bung already built into it for such a purpose. For those of us who are retrofitting an old tank however, it’s a little more involved. I found that a later model sending unit could be easily manipulated to take a return line and in a matter of an hour or so, had the tank up and ready to accept a return line without having to remove it from the cab.
The ECU then ‘learns’ the proper fuel curve determined by a number of sensors on the engin
Here’s the wiring harness for the EFI system. While it looks like a lot at first glance, o
In addition to the EFI wiring harness, the main power harness will need to be installed to
The fuel system requirements are extremely simple and consist of an inline fuel pump and a
The Holley Avenger kit provides all the sensors and external gadgets necessary save for an
Pictured here are the coolant temperature, wide band O2, and MAP sensor, along with a plat