Flex fuel
Tourer
Joined: Jan 2014
Posts: 282
Likes: 62
From: Wilson, NC
Yeah, the fuel quality sensor method has been used by a lot of car manufacturers, mostly with quite poor result. The SAAB system used lambda sensor signal to monitor afr and interpolated between maps for gas and E85. It worked really well, but unfortunately the business model did not.. 
Road Warrior
Joined: Dec 2015
Posts: 1,826
Likes: 1,047
From: Southwest Desert
I look for non-ethanol gas when it is available and would not use gasoline that is more than 10 percent ethanol. Regularly ridden bikes do better than bike that are stored with ethanol fuel in it. The ethanol attracts water from the air and it pools at the bottom of tanks and carb bowls and turns to gel, and eventually corrosion. Fuel stabilizers don't really work, and the best option is to ride daily and keep fresh fuel in your tanks. As stated earlier, ethanol gas is hard on rubber parts and hoses, so keep an eye on them and make sure you use compatible fuel lines when you do replace them. There are plenty of threads on this topic on HD forums 
Banned
Joined: Jun 2022
Posts: 673
Likes: 409
What you are referring to is called infered method of reading ethanol using your 02 sensors and tuning to lambda 1. This is currently used alot on newer mopar vehicles for flex tune purposes. I have a hellcat motor in my Ram truck with a flex fuel tune and can watch the 02 readings change depending on the fuel I'm running.
Tourer
Joined: Jan 2014
Posts: 282
Likes: 62
From: Wilson, NC
Yep, with just a pulley swap, some 1000cc injectors, e85 and tune it makes around 937hp according to my tuner. Makes the big truck move on out!
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,071
Likes: 1,006
honda had great success with the PGM-FI. the BIG issue with the saab systems and such is that the more you can tell the ECU the better the outcome. one thing you have to remember is the common on the road is a compromise and is generic in results, sort alike mfg says use this gap but a tuner tweak's it and index's it and whalla, make an improvement. ironic is, you would figure load would make the swings more radical but the opposite is true when pulling a load.
my wranger dyno cannot tell any diff but i am sure it is there good or bad. i can tell you this is running alky in a system not ready to handle it produces not many desirable results.
my wranger dyno cannot tell any diff but i am sure it is there good or bad. i can tell you this is running alky in a system not ready to handle it produces not many desirable results.
Banned
Joined: Jun 2022
Posts: 673
Likes: 409
honda had great success with the PGM-FI. the BIG issue with the saab systems and such is that the more you can tell the ECU the better the outcome. one thing you have to remember is the common on the road is a compromise and is generic in results, sort alike mfg says use this gap but a tuner tweak's it and index's it and whalla, make an improvement. ironic is, you would figure load would make the swings more radical but the opposite is true when pulling a load.
my wranger dyno cannot tell any diff but i am sure it is there good or bad. i can tell you this is running alky in a system not ready to handle it produces not many desirable results.
my wranger dyno cannot tell any diff but i am sure it is there good or bad. i can tell you this is running alky in a system not ready to handle it produces not many desirable results.
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,071
Likes: 1,006
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