on e85 how lean do you guys go on cruise?
#5
Money talks-mine says bye
iTrader: (18)
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.
#7
talking head
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..
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..
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#8
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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.
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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