FreeFuel ECU patch - a flex fuel implementation to Evo ECU
#346
EvoM Guru
iTrader: (7)
Changes in battery supply voltage are smoothed by the voltage regulator (LM317) in the circuit you built. A fluctuation of +/- 2.5% in your output voltage (=E%) is within the tolerance expected for the output side of your circuit.
An input variation of +/- 2.5% is easily good enough to drive the FlexFuel routines in the patched ECU without adding risk. Don't you think it's time to turn it on and start tuning?
#347
EvoM Guru
iTrader: (7)
Just connect your gauge output to the ECU pin that is used normally for map switching:
- Evo 8 4-plug ECU: pin 42
- Evo 8 3-plug ECU: pin 64
Follow the steps in the first few posts to patch your ROM and start tuning!
The following users liked this post:
dr_latino999 (Oct 19, 2016)
#348
Evolving Member
iTrader: (5)
If you already have a 0-5V analog output from your Innovate ethanol content gauge, you don't need to build the converter circuit. All the circuit does is to convert the frequency output from your ethanol sensor into a voltage that can be read by the ECU.
Just connect your gauge output to the ECU pin that is used normally for map switching:
- Evo 8 4-plug ECU: pin 42
- Evo 8 3-plug ECU: pin 64
Follow the steps in the first few posts to patch your ROM and start tuning!
Just connect your gauge output to the ECU pin that is used normally for map switching:
- Evo 8 4-plug ECU: pin 42
- Evo 8 3-plug ECU: pin 64
Follow the steps in the first few posts to patch your ROM and start tuning!
#349
Evolved Member
iTrader: (2)
Congrats on the progress you have made Wreckleford - about time too
Changes in battery supply voltage are smoothed by the voltage regulator (LM317) in the circuit you built. A fluctuation of +/- 2.5% in your output voltage (=E%) is within the tolerance expected for the output side of your circuit.
An input variation of +/- 2.5% is easily good enough to drive the FlexFuel routines in the patched ECU without adding risk. Don't you think it's time to turn it on and start tuning?
Changes in battery supply voltage are smoothed by the voltage regulator (LM317) in the circuit you built. A fluctuation of +/- 2.5% in your output voltage (=E%) is within the tolerance expected for the output side of your circuit.
An input variation of +/- 2.5% is easily good enough to drive the FlexFuel routines in the patched ECU without adding risk. Don't you think it's time to turn it on and start tuning?
#350
Evolved Member
iTrader: (2)
If you already have a 0-5V analog output from your Innovate ethanol content gauge, you don't need to build the converter circuit. All the circuit does is to convert the frequency output from your ethanol sensor into a voltage that can be read by the ECU.
Just connect your gauge output to the ECU pin that is used normally for map switching:
- Evo 8 4-plug ECU: pin 42
- Evo 8 3-plug ECU: pin 64
Follow the steps in the first few posts to patch your ROM and start tuning!
Just connect your gauge output to the ECU pin that is used normally for map switching:
- Evo 8 4-plug ECU: pin 42
- Evo 8 3-plug ECU: pin 64
Follow the steps in the first few posts to patch your ROM and start tuning!
#351
Evolved Member
iTrader: (2)
After many many months I finally started my car with the converter circuit and ethanol content sensor connected. I put a couple gallons of pump fuel in the tank to start with. I measured this with my ethanol tester beforehand and found it to be E07. This showed as E06.9 with the voltage to ethanol percent scaling I used in Evoscan. Threw a half gallon of E98 into the tank and got E22 registered which is roughly correct for the amount I added to the original pump gas. I intend to drain a little bit and check it in the tester also but haven't done so yet.
At this point I am not making use of the free fuel patch rom, just logging ethanol content. The 02 feedback is adjusting for the additional ethanol currently. What I found though is that the ethanol content reported fluctuates a little bit, jumping down to 17% momentarily and back up to 22%. I'm wondering if this is corresponding to changes in my battery voltage (it fluctuates somewhat) or if this is to be expected.
I will update further when I actually implement the patch. At the rate i am going it might be several more months.
At this point I am not making use of the free fuel patch rom, just logging ethanol content. The 02 feedback is adjusting for the additional ethanol currently. What I found though is that the ethanol content reported fluctuates a little bit, jumping down to 17% momentarily and back up to 22%. I'm wondering if this is corresponding to changes in my battery voltage (it fluctuates somewhat) or if this is to be expected.
I will update further when I actually implement the patch. At the rate i am going it might be several more months.
#352
Which sensor would this work with?
Nice to see that some people are using FreeFuel in the US and are happy with it.
I wonder if anybody in the US would be interested in adapter / converter designed for FreeFuel to convert sensor signal to ECU analog input. It's a fully digital adapter designed by me. Unlike analog solutions output voltage range is optimized to allow using safety features built into the FreeFuel patch and maximum ethanol content resolution. Output is also very stable is much faster to react to sensor signal change than analog designs. It is currently in use in some cars in Finland with good feedback. Installation is made as simple as possible: just pull one wire through firewall to engine bay, push pins to sensor connector frame and solder three wires to ECU.
Price would be around 100 USD shipped to US from Finland. Not sure if you have to pay taxes on top of that.
I have attached a spec sheet to this message.
I would appreciate if the discussion of the other FlexFuel solution, apparently called FiTronic, would be kept outside this thread. As far as I know it has nothing to do with this patch and it can be extremely confusing to mix the discussion about it here. Thank you.
I wonder if anybody in the US would be interested in adapter / converter designed for FreeFuel to convert sensor signal to ECU analog input. It's a fully digital adapter designed by me. Unlike analog solutions output voltage range is optimized to allow using safety features built into the FreeFuel patch and maximum ethanol content resolution. Output is also very stable is much faster to react to sensor signal change than analog designs. It is currently in use in some cars in Finland with good feedback. Installation is made as simple as possible: just pull one wire through firewall to engine bay, push pins to sensor connector frame and solder three wires to ECU.
Price would be around 100 USD shipped to US from Finland. Not sure if you have to pay taxes on top of that.
I have attached a spec sheet to this message.
I would appreciate if the discussion of the other FlexFuel solution, apparently called FiTronic, would be kept outside this thread. As far as I know it has nothing to do with this patch and it can be extremely confusing to mix the discussion about it here. Thank you.
#354
After many many months I finally started my car with the converter circuit and ethanol content sensor connected. I put a couple gallons of pump fuel in the tank to start with. I measured this with my ethanol tester beforehand and found it to be E07. This showed as E06.9 with the voltage to ethanol percent scaling I used in Evoscan. Threw a half gallon of E98 into the tank and got E22 registered which is roughly correct for the amount I added to the original pump gas. I intend to drain a little bit and check it in the tester also but haven't done so yet.
At this point I am not making use of the free fuel patch rom, just logging ethanol content. The 02 feedback is adjusting for the additional ethanol currently. What I found though is that the ethanol content reported fluctuates a little bit, jumping down to 17% momentarily and back up to 22%. I'm wondering if this is corresponding to changes in my battery voltage (it fluctuates somewhat) or if this is to be expected.
I will update further when I actually implement the patch. At the rate i am going it might be several more months.
At this point I am not making use of the free fuel patch rom, just logging ethanol content. The 02 feedback is adjusting for the additional ethanol currently. What I found though is that the ethanol content reported fluctuates a little bit, jumping down to 17% momentarily and back up to 22%. I'm wondering if this is corresponding to changes in my battery voltage (it fluctuates somewhat) or if this is to be expected.
I will update further when I actually implement the patch. At the rate i am going it might be several more months.