FreeFuel ECU patch - a flex fuel implementation to Evo ECU
#181
EvoM Guru
iTrader: (7)
My Futurlec order still hasn't arrived after three weeks so I've just reordered the components from Mouser. They should be here next week.
Went out to RadioShack to get a box to put the circuit board in to protect it. This is 3" x 1.5" x 1" and will fit neatly by the ECU.
I'm not sure of the best place to insert the FlexFuel sensor into the return line. The flex hose in the engine bay between FPR and hard return seems easy but I don't know if it drains out when the fuel pump is off. If it does drain, it would give a false reading on startup. Can anyone add their own experience of mounting it in this position?
More to follow when those components arrive.......
Went out to RadioShack to get a box to put the circuit board in to protect it. This is 3" x 1.5" x 1" and will fit neatly by the ECU.
I'm not sure of the best place to insert the FlexFuel sensor into the return line. The flex hose in the engine bay between FPR and hard return seems easy but I don't know if it drains out when the fuel pump is off. If it does drain, it would give a false reading on startup. Can anyone add their own experience of mounting it in this position?
More to follow when those components arrive.......
Last edited by CDrinkH2O; Jan 25, 2014 at 04:15 PM. Reason: Added pic
#183
This is a great idea for the evo community. also where do I get FreeFuel_v1.1_patch.jdf, I only see .asm files.
~~Edit~~
Nevermind saw that the jdf was posted in second post.
~~Edit~~
Nevermind saw that the jdf was posted in second post.
Last edited by kaganader2; Jan 26, 2014 at 10:13 AM.
#184
Evolving Member
iTrader: (12)
I'm not sure of the best place to insert the FlexFuel sensor into the return line. The flex hose in the engine bay between FPR and hard return seems easy but I don't know if it drains out when the fuel pump is off. If it does drain, it would give a false reading on startup. Can anyone add their own experience of mounting it in this position?
#185
EvoM Guru
iTrader: (7)
240Z TwinTurbo Mounted his on the firewall in line with the return line. R/T Ernie was talking about moving his further back toward's the fuel pump.
#187
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#189
Evolving Member
iTrader: (7)
Looking good man. Way to take the baton.
In the code, we need to implement a simple reporting mechanism (which may/may not require deleting one that exists lol). Just a thought with no real scientific premise.
After a little bit (5 minutes) of research, I would probably have to redesign the circuit or create an isolating splitter to report voltage to the ECU and a gauge. I don't want to mess with the current model by probing it due to it's simplicity, functionality, and accuracy.
Edit: "isolating splitter" / OPAMP lol
In the code, we need to implement a simple reporting mechanism (which may/may not require deleting one that exists lol). Just a thought with no real scientific premise.
After a little bit (5 minutes) of research, I would probably have to redesign the circuit or create an isolating splitter to report voltage to the ECU and a gauge. I don't want to mess with the current model by probing it due to it's simplicity, functionality, and accuracy.
Edit: "isolating splitter" / OPAMP lol
Last edited by evoredy; Jul 24, 2016 at 08:31 PM.
#194
EvoM Guru
iTrader: (7)
I got the circuit built and tested it with the sensor and some control fuel mixtures this weekend. Output voltages were a little higher then expected which I traced to an out of spec C1. It measured 10.4 nF , too far to the high end of the tolerance range. I found another capacitor which measured 9.8 nF, soldered it in, and it gave me the correct output range. I recalibrated using Air = E0 = 50Hz = 1.59V; E80 = 135Hz = 4.26V, and E100 = 158Hz = 4.98V. Here is the finished product.
Next up was to complete the loom for the sensor and finally the power and ground feed ready for installation next week. All set!
Next up was to complete the loom for the sensor and finally the power and ground feed ready for installation next week. All set!