Gas Prices too high - time for FFV mods?
Sep 13, 2005, 11:17 AM
#106
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Originally Posted by RFH
not true as E85 is 33 % 02 by weight, so the extra air is in the fuel, also as E85 evaporates it cools, meaning denser air entering the combustion chamber.
the fuel with the most o2 and heat of evaporation will make the most power.
to map for E85 you start by adding 27% to the entire map. then with a wide band then tune fuel by A/F (different than gas with stoich at 9.96)
then once A/f is correct for max hp, egt limit, etc
then tune spark for MBT , presto E85 map.
the fuel with the most o2 and heat of evaporation will make the most power.
to map for E85 you start by adding 27% to the entire map. then with a wide band then tune fuel by A/F (different than gas with stoich at 9.96)
then once A/f is correct for max hp, egt limit, etc
then tune spark for MBT , presto E85 map.
Who has a wideband that reads below 10:1?
forced induction running e85 *may* produce equal/more power.
But in NA applications it will produce less power. When you inject 27% more fuel That takes up room that would have been air.its not gonna produce 27% more air as well from evaporation.
Fuel without air is useless.
Now when you can compress more air into the intake track, that is a different storry.. Do you or anyone have any information/dyno sheets from a boosted car?
Sep 13, 2005, 11:45 AM
#108
Evolving Member
Originally Posted by zyounker
Who has a wideband that reads below 10:1?
But in NA applications it will produce less power. When you inject 27% more fuel That takes up room that would have been air.its not gonna produce 27% more air as well from evaporation.
Dave
Sep 13, 2005, 01:13 PM
#109
Originally Posted by djh
Making a WB that reads below 10:1 is easy. Making it accurate is impossible with a Bosch LSU.
d
Sep 13, 2005, 03:10 PM
#110
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yes the process is the same for E95
also the WBo2 will read AF correctly, however you need to realize that stoich for E85 is 9.96 so the voltage the sensor out puts at 14.7 on gas will = 9.96 on E85, you need to adjust the scale of the out put
as far as NA making more power. Infact at school I converted an engine to run on E85 and dynoed 2.5% more hp from the fuel change alone(turbo will be much higher with increased boost and timing).
It is possible becasue E85 is actually 33% oxygen by weight, thus providing enough air for combustion.
This is because of the increased latent heat of evaporation, denser charge and higher resultant IMEP. If you still question me look up a SAE paper on this done by FORD, they claim 5% NA from the switch.
unfortuatly I cannot provide any graphs.
also the WBo2 will read AF correctly, however you need to realize that stoich for E85 is 9.96 so the voltage the sensor out puts at 14.7 on gas will = 9.96 on E85, you need to adjust the scale of the out put
as far as NA making more power. Infact at school I converted an engine to run on E85 and dynoed 2.5% more hp from the fuel change alone(turbo will be much higher with increased boost and timing).
It is possible becasue E85 is actually 33% oxygen by weight, thus providing enough air for combustion.
This is because of the increased latent heat of evaporation, denser charge and higher resultant IMEP. If you still question me look up a SAE paper on this done by FORD, they claim 5% NA from the switch.
unfortuatly I cannot provide any graphs.
Last edited by RFH; Sep 13, 2005 at 03:31 PM.
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