72redChally, you asked a lot of specific questions in your last post. You can feel free to contact me directly by email for responses to your more specific questions. On this message board, I try to post responses to questions that are a bit more general.
The components that you need for this EFI swap are divided into three main categories:
(1) Electronics (2) Fuel System (3) Air Intake.
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1.) Electronics
You need the following:
- 1989 to 1993 Ford 5.0L Mustang Computer
These years were mass-air computer equiped.
- The computer wiring harness for that vehicle.
The wiring harness has 3 parts - the main harness (that connects to the computer), the injector harness (that sits on top of the engine's intake manifold) and the O2 Sensor harness (that connects under the car to the O2 sensors.) All three parts of the harness clip together.
- A hybird distributor
This is a 1989 to 1993 Ford 5.0L Mustang distributor that has been machined to fit in a Mopar engine block.
I will probably end up selling them in the future because I get a lot of requests for this piece of the EFI conversion.
- All the Ford engine sensors
O2 sensors, TPI sensor (on the throttle-body), coolant temp sensor (in the coolant tube on the manifold), Mass air sensor, barametric pressure sensor (on the fire wall), Air temp sensor (in the intake manifold) and anything else that the computer wiring harness connects to on the firewall.
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2.) Fuel System
You need the following:
- Injectors
You may want to use Mustang 19lb injectors or you might want to get bigger sized injectors. This depends on the horsepower level of your engine.
- Fuel Pump
You don't need the Mustang's in-tank pump. It was barely big enough for the 225 HP Mustang after the engine was modified. Get an externally mounted aftermarket EFI pump that is big enough to satisfy the fuel requirements for your engine's horsepower level.
- Fuel Pressure Regulator and a return fuel line.
Carb vehicles have a fuel inlet line. Many EFI systems have an inlet and a return line back to the tank. the Fuel pressure regulator regulates/restricts the flow of fuel back to the gas tank which builds up the fuel pressure in the fuel rails for the injectors. (38 -44 psi)
- Fuel rails
Summitt sells them for about $26 bucks each. (They need to be machined for the injectors.)
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3.) Air Intake
You need the following:
- Intake manifold.
A single plane 4bbl style intake that has been machined for fuel injectors.
- A Throttle Elbow
This elbow connects the Ford throttlebody to the 4bbl intake manifold.
- Throttlebody and mass air sensor
You can use stock Mustang parts, but remember that the 5.0 Mustang engine only made 225 HP. If your engine makes significantly more HP, you might want to find an aftermarket mass air sensor and throttlebody that is big enough to allow all the air flow that your engine needs. You can always use the stock Mustang components to get the engine running and upgrade later.
- Throttle cable and Transmission Kick-down cable (for automatic trans owners)
Lokar sells these cables. The are adjustable and work extremely well.
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Note: The fuel injector size needs to be matched to the mass air sensor's calibration. For example, say that your engine's HP level requires you to get 30lb fuel injectors. Make sure that the mass air sensor is calibrated for these injectors. C&L Performance makes several different sizes of mass air sensors for the Mustang. These mass air sensors use exchangable flow tubes to calibrate for the correct injector size. With a C&L Performance mass air sensor, you can upgrade injector sizes and cost effectively re-calibrate your mass air sensor to match.
This post is a pretty good overview of what will be needed for the Mopar/Ford EFI conversion. This post is not intended to be a complete list of every part required. This basic information should be helpful as a general guide for folks that might be interested in considering this cost effective fuel injection option. There are many options for Mopar owners that want to consider fuel injection. The strengths of this EFI swap are:
1.) Lower costs than most other aftermarket EFI systems, and 2.) The computer system doesn't require programming from a laptop or other such device. Connect it properly, and the computer makes the adjustments that it needs to make for the engine to function optimally. Of course, this system was designed by Ford for a sports car that was intended for street use. More radical engine combinations that are intended for race applications might benefit from computer tweeking.
