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      01-19-2013, 06:21 PM   #1
greensto
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e85 Question

I currently am running Map 5 on my JB4 and have been doing a 30/70 e85 mix with pretty good results, spiking approximately 17.5 psi. If Map 7 targets 16.5 psi with a 50/50 mix, do I have any reason to increase my e85 mix if boost levels are "already there?"

Also, Terry recommends "no more than 45%" e85 ratio on Map 7. If e85 is 105 octane and I do a mix of 45/55 with 93 octane, then the combined octane would be 98.4. If Map 7 is for 100 octane, why would the recommended octane be slightly less?... e85 would have to be over 108 octane for that ratio to break 100 octane.

Last edited by greensto; 01-19-2013 at 07:32 PM..
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      01-19-2013, 08:13 PM   #2
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I don't run the JB4 so I can't speak to the changes between map 5 and 7.

However for part 2: e85 effectively isn't 105 octane, e85 will usually(depending on actual ethanol percentage) tune like its closer to c116 than 105. The downside is that it requires ~30% more fuel volume than 93. That's why terry recommends a 45% mix. It will, more than likely, max out the LPFP at any higher concentrations.

Long story short, if your logs look good than you are good.
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      01-20-2013, 12:18 PM   #3
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Are you spiking at 17.5 or are you actually hitting 17.5 for a length of time?
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      01-20-2013, 01:09 PM   #4
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