Map interpolation using a flex fuel composition sensor?
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Evolving Member
Joined: Feb 2008
Posts: 254
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From: SoCal
Map interpolation using a flex fuel composition sensor?
In a previous thread regarding E85 and the alt-map switching harness, mrfred wrote:
Any idea if it is still planned to implement this feature?
Especially with the variation in ethanol content in the E85 available from E85 pumps, and with people switching back and forth between 91 & E85 leading to different composition mixes of 91 & E85, this feature would be pretty useful. Plus it would obviate the need to switch backwards and forwards between maps, accidentally running the wrong map etc.
It works great with the factory ECU, and its only going to get better. I found a spare ADC (0-5V signal) input on the factory ECU. A toggle switch is wired up so that this input sees either 0 V or 5 V. tephra has recoded the ECU so that the ECU will choose between two sets of maps depending on which voltage it reads at the this ADC input. The maps right now include timing, fuel, boost, and I believe injector scaling. We may expand this range of maps, and for sure we will eventually setup interpolation between the two maps based on input voltage so that a flex fuel composition sensor can be wired up the ECU to make the Evo a true flex fuel vehicle.
Especially with the variation in ethanol content in the E85 available from E85 pumps, and with people switching back and forth between 91 & E85 leading to different composition mixes of 91 & E85, this feature would be pretty useful. Plus it would obviate the need to switch backwards and forwards between maps, accidentally running the wrong map etc.
In a previous thread regarding E85 and the alt-map switching harness, mrfred wrote:
Any idea if it is still planned to implement this feature?
Especially with the variation in ethanol content in the E85 available from E85 pumps, and with people switching back and forth between 91 & E85 leading to different composition mixes of 91 & E85, this feature would be pretty useful. Plus it would obviate the need to switch backwards and forwards between maps, accidentally running the wrong map etc.
Any idea if it is still planned to implement this feature?
Especially with the variation in ethanol content in the E85 available from E85 pumps, and with people switching back and forth between 91 & E85 leading to different composition mixes of 91 & E85, this feature would be pretty useful. Plus it would obviate the need to switch backwards and forwards between maps, accidentally running the wrong map etc.
Thread Starter
Evolving Member
Joined: Feb 2008
Posts: 254
Likes: 1
From: SoCal
Not sure what / which thread you are referring to here.
'mrfred' post I quoted was taken out of a thread that is about 6 months old, and seemed more related to general E85 tuning rather than the specific question I am asking.
'mrfred' post I quoted was taken out of a thread that is about 6 months old, and seemed more related to general E85 tuning rather than the specific question I am asking.
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dudical26
ECU Flash
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Jan 10, 2020 08:21 AM
alt-map, composition, composition sensor, e85, ecu, flex, flex fuel, fuel, interpolation, locaition, map, sensor, stock, tephra, vehicle
