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diesel_john · 12-05-2011, 11:50 PM

Rigged up a heavy duty switch on the fuel injectors power wire. Also have a heavy duty rheostat in that circuit to vary the voltage to all the injectors.
The resistor value is about 0 to 50 ohms. Have to turn it to 0 ohms to start it cold then can turn it up towards 50 ohms after its warmed up to lean it out. I know it's brute force but i've gotten 19 MPG on the highway by doing this, and putting a check valve in the vacuum line to the fuel pressure regulator. This is OBD-I stuff. OBD-II might be too smart for this to work.

I keep engine braking to a minimum because it's still braking.

12-05-2011, 11:50 PM	#5 (permalink)
diesel_john MP$ Join Date: Jan 2008 Location: SW Ohio Posts: 595 Thanks: 5 Thanked 19 Times in 14 Posts	1991 F-250 fuel cut off 302 5-speed Rigged up a heavy duty switch on the fuel injectors power wire. Also have a heavy duty rheostat in that circuit to vary the voltage to all the injectors. The resistor value is about 0 to 50 ohms. Have to turn it to 0 ohms to start it cold then can turn it up towards 50 ohms after its warmed up to lean it out. I know it's brute force but i've gotten 19 MPG on the highway by doing this, and putting a check valve in the vacuum line to the fuel pressure regulator. This is OBD-I stuff. OBD-II might be too smart for this to work. I keep engine braking to a minimum because it's still braking. Last edited by diesel_john; 12-05-2011 at 11:58 PM..