on e85 how lean do you guys go on cruise?
how lean are you guys going? under vacuum im at 14.x
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Is your wideband tuned for reading e85 ? 14.anything with e85 is really really lean. You should be somewhere more around 11-12
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^^^ wrong. Tune to same AFR's as you would on Gas.
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Originally Posted by 4pistonkiller
(Post 11803899)
Is your wideband tuned for reading e85 ? 14.anything with e85 is really really lean. You should be somewhere more around 11-12
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Originally Posted by jacobcartmill
(Post 11804233)
yeah please try to be informed on the topic before responding to questions.
If by cruise you mean under 0 psi then you can go to at least 16-17 eqAFR with E85 since detonation risk is only a concern at high boost (and temp) levels. Just ensure that your ignition is strong enough to avoid a lean miss. |
I am doing 14.0-14.3 AFR cruising after my last tune.. Drives great..
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E85 Stoic is 9.765 :1
petrol stoic is 14.7 : 1 if your petrol /gasoline mode AFR is reading 14:1 and you are running with petrol in the tank then 14/14.7 = lambda of 0.95 if your petrol AFR gauge is reading 14 and you have e85 in the tank then the wideband is still reading a 0.95 lambda but is using the factor of 14.7 to the lambda value to produce the number on the ( petrol/gasoline ) AFR scale if it was flipped in its program to display as E85 AFR instead ( some do ) then it would scale it thus 0.95 lambda x 9.765 = 9.3:1 E85 though it may be best to stick your gauges instead to a lambda display and learn to tune from that if there is any variance in your e85 pump blends // im using LPG, and my equivalence is 15.5 :1 .. and mine idles at 1.00 lambda and cruises at 0.95 - 1.00.. |
Originally Posted by cone_crushr
(Post 11805745)
A bit harsh JC. Not many people understand this AFR vs Lambda issue. Recognize that the better term is "gasoline equivalent" AFR since all O2 gages read in Lambda times a fuel correction factor.
If by cruise you mean under 0 psi then you can go to at least 16-17 eqAFR with E85 since detonation risk is only a concern at high boost (and temp) levels. Just ensure that your ignition is strong enough to avoid a lean miss. Is anyone doing a "lean cruise" on e85 under light boost? |
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