Is there any feature that will automatically adjust fuel curves etc for % ethanol? There are several charts with an input for %ethanol but I have no idea what they change. Lower Limit of FA Ratio, Upper Limit of FA Ratio, and Stoich FA Ratio and a couple more under fuel have inputs for %ethanol.
Crank Fuel Surface Y2, Crank Fuel Y1, and Restart Fuel Multiplier have a chart with %ethanol as one of the axis.
There might even be more, I didn't go through it all..... Any one know where I would input my %ethanol, and what it will affect?
It's not working, yet, but I have been working with SCT to get all of the scalars that are needed put into the software to make it work. It is definitely all inside the NGC3 PCM, just need access to all of the tables to make it work properly. I have done many experiments with some success so far, but it is a long ways from prime time.
I have another question... the "value files" that prp came with.... how can I find a discription of them? Are they any good? I used some stuff off of an "srt4 base changes 93oct" file, and it was garbage.... set my solenoid duty to like 99% and I ran far too lean... maybe it's for larger than stg 2 injectors? I was interested because it changed many other things than just the basics. I can tune fuel and boost well, but there isn't too much info on ALOT of the tables that were in the files. I was hoping one would safely advance my timing from stock stg 2 but they looked to have the same timing tables, if anything retarded slightly in the higher boost range.
Turns out the tables I understood from the "value files" didn't really seem like they went well with stg 2.
It's not working, yet, but I have been working with SCT to get all of the scalars that are needed put into the software to make it work. It is definitely all inside the NGC3 PCM, just need access to all of the tables to make it work properly. I have done many experiments with some success so far, but it is a long ways from prime time.
Are you using a OE "Fuel Sensor" then to automatically detect the E%?
I've been kinda snooping arount the CMR to see if the proper switches and scaler are there.
I did see a hardware switch scalar "Sensorless FlexFuel equipped-NO" that looked interesting. I thought all flex fuel cars had a fuel sensor
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Last edited by duster360 : 10-01-2009 at 09:52 AM.
It's not working, yet, but I have been working with SCT to get all of the scalars that are needed put into the software to make it work. It is definitely all inside the NGC3 PCM, just need access to all of the tables to make it work properly. I have done many experiments with some success so far, but it is a long ways from prime time.
Nemiro keep up the hard work, and bring us what we want!!
There is no external ethanol sensor. Chrysler uses what is called "Sensorless FFV", which is basically a VERY carefully calibrated setup, and uses both O2 sensors to see that some percentage of fuel is having to be added to get to 1.0 lambda. If that percentage is consistent under various conditions, it assumes ethanol in the fuel (or lack of it) and adjusts fueling by that percentage, and changes timing to take advantage of the ethanol. All seamless to the driver. It is NOT as good a setup as the GM style sensored FFV, but it has been proven to work since 1993 in the Dodge Spirit FFV (which could run ethanol OR methanol).
The hardware 'switch' will change what the DRBIII displays on the PCM configuration screen, and that's pretty much it.
There is no external ethanol sensor. Chrysler uses what is called "Sensorless FFV", which is basically a VERY carefully calibrated setup, and uses both O2 sensors to see that some percentage of fuel is having to be added to get to 1.0 lambda. If that percentage is consistent under various conditions, it assumes ethanol in the fuel (or lack of it) and adjusts fueling by that percentage, and changes timing to take advantage of the ethanol. All seamless to the driver. It is NOT as good a setup as the GM style sensored FFV, but it has been proven to work since 1993 in the Dodge Spirit FFV (which could run ethanol OR methanol).
The hardware 'switch' will change what the DRBIII displays on the PCM configuration screen, and that's pretty much it.
Interesting.
I sold parts at the Dodge dealer from 95-2000, I could have sworn the NS minivans used a sensor on the 3.3 flex fuel. I remember seeing what I thought was a Ethanol sensor on one at least. I don't know what else it could have been, it was a small hunk of Al with 2 fuel lines and 2-3 wires running in and out of it.
It may have been, but ALL of the NGC3 and NGC4 cars use the existing O2 sensors to do the job. Ethanol sensor would be much, much better, IMO, but that is just not in the programming, hence Sensorless FFV.
It may have been, but ALL of the NGC3 and NGC4 cars use the existing O2 sensors to do the job. Ethanol sensor would be much, much better, IMO, but that is just not in the programming, hence Sensorless FFV.
Better at adapting to fuel changes but much, much more expensive too...
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PRP and Ethanol
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