Alternative Fuels Discussion and Tech on using alternatives such as E85 or Hydrogen or other fuels and/or supplements to Gasoline in Rotary Engines

new to tuning e85. help me fill in the blanks

Old 09-08-13, 12:48 AM
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new to tuning e85. help me fill in the blanks

what are the AFR ratios i would like to stay around stoich for e85 is 9.76, how rich or lean can i safely go with out blowing the engine. could you guys help me fill in the blanks. ive looked for several days and i dont really see an average or safe AFR.

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Old 09-08-13, 12:52 AM
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also what about timing? i saw a couple that said that it wouldnt matter, any advice?
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Old 09-08-13, 07:49 AM
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Nice thing about E85 is it is VERY forgiving...
I keep my AFR's in the low 12's which produces gobs of power for me.
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Old 09-08-13, 08:27 AM
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AFR vs RPM doesn't have enough definition to tune for. You also need to base the tuning off of engine load (MAP). With that being said this table is what I'm using for E85. It's based on using a wideband that's setup for gasoline. Use this at your discretion, all engines are different and respond differently to different AFR's.

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To convert those numbers into numbers for a wideband that's been set to output for E85: divide by 14.7, that will give you Lambda. Then take that Lamba reading and multiply by 9.765. That will give you the AFR for a wideband that's outputing for E85. Here's a chart to show some comparison between Lambda / E85 / Gas:

Lambda E85 Gas
0.750 7.320 11.025
0.760 7.418 11.172
0.770 7.515 11.319
0.780 7.613 11.466
0.790 7.710 11.613
0.800 7.808 11.760
0.810 7.906 11.907
0.820 8.003 12.054
0.830 8.101 12.201
0.840 8.198 12.348
0.850 8.296 12.495
0.860 8.394 12.642
0.870 8.491 12.789
0.880 8.589 12.936
0.890 8.686 13.083
0.900 8.784 13.230
0.910 8.882 13.377
0.920 8.979 13.524
0.930 9.077 13.671
0.940 9.174 13.818
0.950 9.272 13.965
0.960 9.370 14.112
0.970 9.467 14.259
0.980 9.565 14.406
0.990 9.662 14.553
1.000 9.760 14.700
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Old 09-08-13, 11:07 AM
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Tune as you would for pump.
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Old 09-08-13, 10:17 PM
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Originally Posted by Wildman923 View Post
AFR vs RPM doesn't have enough definition to tune for. You also need to base the tuning off of engine load (MAP). With that being said this table is what I'm using for E85. It's based on using a wideband that's setup for gasoline. Use this at your discretion, all engines are different and respond differently to different AFR's.



To convert those numbers into numbers for a wideband that's been set to output for E85: divide by 14.7, that will give you Lambda. Then take that Lamba reading and multiply by 9.765. That will give you the AFR for a wideband that's outputing for E85. Here's a chart to show some comparison between Lambda / E85 / Gas:

Lambda E85 Gas
0.750 7.320 11.025
0.760 7.418 11.172
0.770 7.515 11.319
0.780 7.613 11.466
0.790 7.710 11.613
0.800 7.808 11.760
0.810 7.906 11.907
0.820 8.003 12.054
0.830 8.101 12.201
0.840 8.198 12.348
0.850 8.296 12.495
0.860 8.394 12.642
0.870 8.491 12.789
0.880 8.589 12.936
0.890 8.686 13.083
0.900 8.784 13.230
0.910 8.882 13.377
0.920 8.979 13.524
0.930 9.077 13.671
0.940 9.174 13.818
0.950 9.272 13.965
0.960 9.370 14.112
0.970 9.467 14.259
0.980 9.565 14.406
0.990 9.662 14.553
1.000 9.760 14.700
What's your current set up like?
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Old 09-09-13, 07:54 AM
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Most widebands, Lambda is Lambda...doesn't matter if it's gas or ethanol.
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