CES eth content sensor installed, flex fuel patch coming soon
May 15, 2009, 07:12 AM
#1
CES eth content sensor installed, flex fuel patch coming soon
I finally got around to installing my ethanol content sensor and CES ethanol content display. It took three evenings, but it turned out really well. The F-V converter is mounted behind the glove box, and the display rests freely in the glove box. I just have to open the glove box to see the display. Nice stealth installation.
I've also got the analog output wired into ADC_0F, so everything is in place to make use of a flex fuel patch. As soon as tephra releases an 88590715 for testing, I'll begin work on a flex fuel patch for that ROM (and then other v7 ROMs as requested). If anyone wants to use the flex fuel patch, you'll need to do two things:
1) You'll need to have an ethanol content system that has a 0-5 V analog output. Wire the analog output into ADC_0F.
2) Make sure your ethanol content analyzer is wired into an IG1 power source. This is needed so that the analyzer continues to function while the engine is starting. Fuses 1-4 in the cabin fuse box are all IG1. I used a mini-add a circuit from Autozone to tap into fuse #4.
I've also got the analog output wired into ADC_0F, so everything is in place to make use of a flex fuel patch. As soon as tephra releases an 88590715 for testing, I'll begin work on a flex fuel patch for that ROM (and then other v7 ROMs as requested). If anyone wants to use the flex fuel patch, you'll need to do two things:
1) You'll need to have an ethanol content system that has a 0-5 V analog output. Wire the analog output into ADC_0F.
2) Make sure your ethanol content analyzer is wired into an IG1 power source. This is needed so that the analyzer continues to function while the engine is starting. Fuses 1-4 in the cabin fuse box are all IG1. I used a mini-add a circuit from Autozone to tap into fuse #4.
May 15, 2009, 09:14 AM
#2
Just wanted to mention that the E85 in my area is 75% ethanol according to my ethanol content analyzer. Accounting for approx 5% denaturing of the ethanol, it seems that my local distributor is targeting about 80% denatured ethanol content when they do their mixing with gasoline.
I also want to thank merkzu for sporting me the freq to voltage converter. :-)
I also want to thank merkzu for sporting me the freq to voltage converter. :-)
Last edited by mrfred; May 15, 2009 at 09:19 AM.
May 15, 2009, 09:34 AM
#5
Also, if you are not using a tephra ROM, ADC_0F can be read on EvoScan with MUT request ID "83". The scaling is 100*x/255 to get ethanol content in percent. I'd have to look at one of tephra's ROMs to see what request ID he's using for his ROMs.
Last edited by mrfred; May 15, 2009 at 09:36 AM.
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May 29, 2009, 09:47 AM
#8
I'm just waiting for tephra to release an 88590015 v7 ROM, and I will get started with the patch.
May 29, 2009, 11:20 AM
#10
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Yes, it will tie the eth% into the tune. The way it will work is that there will be a set of 100% gasoline maps and a set of maximum ethanol content maps. There will be interpolation tables based on ethanol content that will interpolate between the two tunes. The interpolation line will be adjustable.
I'm just waiting for tephra to release an 88590015 v7 ROM, and I will get started with the patch.
I'm just waiting for tephra to release an 88590015 v7 ROM, and I will get started with the patch.
May I suggest something? It might be a better idea to utilize an existing hi/lo map tune by creating additional tables asking what the e% content is of both maps, ie low map for gas could be 10% and e85 could be 85% or if the ECA was installed during tuning those numbers can be used for more accurate results. Then depending on the current readout of the ECA, the interpolation will work off either between 0-10% for the lo map, 10-85% for lo to high map, or 85-100% for the hi map. This way existing tunes can be utilized without needing to convert an entire map over to what amounts to be e0 and e100 maps which I don't think can be done unless one knows what e% it was tuned on to begin with.
Last edited by silex; May 29, 2009 at 11:29 AM.
May 29, 2009, 11:30 AM
#11
Can't wait to for this! You rock mrfred!
May I suggest something? It might be a better idea to utilize an existing hi/lo map tune by creating additional tables asking what the e% content is of both maps, ie low map for gas could be 10% and e85 could be 85% or if the ECA was installed during tuning those numbers can be used for more accurate results. Then depending on the current readout of the ECA, the interpolation will work off either between 0-10% for the lo map, 10-85% for lo to high map, or 85-100% for the hi map. This way existing tunes can be utilized without needing to convert an entire map over to what amounts to be e0 and e100 maps.
May I suggest something? It might be a better idea to utilize an existing hi/lo map tune by creating additional tables asking what the e% content is of both maps, ie low map for gas could be 10% and e85 could be 85% or if the ECA was installed during tuning those numbers can be used for more accurate results. Then depending on the current readout of the ECA, the interpolation will work off either between 0-10% for the lo map, 10-85% for lo to high map, or 85-100% for the hi map. This way existing tunes can be utilized without needing to convert an entire map over to what amounts to be e0 and e100 maps.
May 29, 2009, 11:53 AM
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This would truely be one of the most amazing advances I've seen in the Evo world. Best of luck with the patch! Don't forget about us Evo X guys someday too! Having the capability to fill up on wither fuel at anytime would be crazy.
May 29, 2009, 11:57 AM
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You think getting fuel from a boating area might have pump gas with no ethanol in it? From my understanding, marine engines do not like ethanol mixed into it.