Edelbrock Pro-Flo Multi Point EFI System #3509 for Dodge 440
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.
Below are links to the various pages documenting the installation:
- 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).
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
Between the new EFI and exhaust systems, we've seen a big improvment in the running
and reliability of our coach:
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.
- 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
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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