Edelbrock Pro-Flo Multi Point EFI System #3509 for Dodge 440

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We're slowly becoming experts on electronic fuel injection systems. This project is about installing an Edelbrock Pro-Flo Multi Point EFI system in our old bus. Edelbrock has been producing this system for time, but only recently came out with a version for the Dodge 440. This project took place in July 2004. This will be the third EFI system installed in this vehicle. With this install, we have now sampled all three basic types of EFI systems: alpha-N, MAF and speed density.
  • alpha-N: this type uses only throttle position, engine speed and engine temperature to determine the fuel delivery (Holley ProJection).
  • MAF (mass air flow): this type uses an air mass sensor to calculate the fuel required (AirSensors START).
  • speed density: this type uses a manifold absolute pressure (MAP) sensor, along with sensors for throttle position, engine speed, ambient air and coolant temperatures, and an exhaust oxygen sensor to determine the ideal air:fuel ratio (Edelbrock Pro-Flo).
Below are links to the various pages documenting the installation:

Part I: Opening the Box, Looking it Over

Part II: Our Exhausting Saga Continues

Part III: Out With the Old...

Part IV: ...In With the New

The results:

Between the new EFI and exhaust systems, we've seen a big improvment in the running and reliability of our coach:

  • better acceleration
  • lots more power
  • better fuel economy (when I can keep my foot out of it ;-)
  • no low speed stumbles
  • no reliability problems so far
Our cruising fuel mileage went from a typical 6 MPG to nearly 8 MPG on level roads. The FMC Transit will never get as good mileage as a "regular" FMC coach due to the increased weight and frontal area - not to mention all the wind-fighting claptrap on the roof. Still, a roughly 30% improvement is significant.

I still need to do something to arrange cool air induction to the air cleaner. That should improve both power and economy some more. As it is now, the engine heats up the air about 30 deg F before it gets to the air cleaner.

Actually, I have rigged up a cool (I wouldn't call it exactly "cold") air induction system. It consists of two galvanized round oil drip pans bolted together lip-to-lip surrounding the air cleaner, with flexible aluminum tubes running to near the grille doors on either side. I need to modify the system to use something like PVC pipe instead of the corrugated aluminum tubing, for both better airflow and less heat transfer.

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