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Old 06-20-2007, 01:46 AM   #16 (permalink)
 
Registered: Feb 2004
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Adding a couple gallons of E-85 to a full tank of 91 will not require a full re-tune, but the benefits are un-documented. Nobody really knows what the octane rating of 12 gallons of 91 plus 2 gallons of E-85 is.... and I would not be the guy to experiment with it myself without a good knowledge of fuel properties, and at minimum good data logging to verify you are not leaning out your fuel mix due to the lower energy density of the E-85.

Later,

Keith
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Old 06-20-2007, 01:34 PM   #17 (permalink)
 
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doing 4 gallons e85 and 10 gallons 91 would put you at about 95-97 octane. You don't need a re-tune to run it but you will see more of a gain if you do. You can also add different paint thinners and things like that to change you octane. I will find the link and post it.
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Old 06-20-2007, 01:54 PM   #18 (permalink)
 
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Quote:
Originally Posted by Warrtalon View Post
Uh no, adding E85 to 91 does not raise your octane like that. E85 requires a COMPLETELY different tune - it cannot just be mixed with gas to raise octane. You can add higher octane gas with lower octane gas, but you can't just add E85 (ethanol) to gas. Anyone doing that is messing up unless they are tuned for it. Are you saying Evos in the RM area are doing that???
I have done this many times and I learned this from my father who raced stock cars and motorcycles for over 20 years. The biggest reason you would want to do this is to help stop detation. And no not everyone doing that is messing up. It is kind of like running methonal/water injection but not as much.. as my dad says "this is so old school you have know idea"
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Old 06-20-2007, 02:01 PM   #19 (permalink)
 
Registered: Apr 2007
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http://www.gnttype.org/techarea/misc/octanebooster.html
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