without internal mods you can advance timing and thats about it. E85 is BOOSTJUICE. I run 9lbs more on a turbo bike and it develops 140 extra hp (380 total at wheel from 1liter) when on e85 vs 91 octane. also a couple guys run it in hondas around here in albuquerque and are rocking 14.5-1.There is one B18A1 is running 16 to 1 but he says when it gets around 200 degrees it diesels and he has to turn it off with the clutch
from raceone85.com
Q: Why should I switch to E85?
A: E85 is a renewable fuel source that is also environmentally friendly. Its performance is comparable to race gas at a fraction of the cost. Your engine will run cooler and your ETs will be less affected by atmospheric changes. E85 is not corrosive like methanol and does not leave carbon deposits like gas so maintenance is reduced across the board. With the proper tune-up your oil stays looking like new.
Q: What is the difference in ethanol and methanol?
A: Both fuels have an excellent intake air charge cooling effect. Ethanol (grain or ethyl alcohol) is a biofuel made through the distillation of renewable resources like corn, sugar cane and switch grass. Yes, this is the same process they use to make alcoholic beverages like liquor. Fuel ethanol is 180 proof when produced. 15% regular 87 octane gasoline is added to E100 to add a little lubricant as well as ease the initial cold startup. Methanol (wood alcohol) is produced through a chemical process. By its nature methanol is more corrosive and provides 35% less energy then E85 so you have to burn 35% more of it to make comparable power. E85 cost the same or less then regular unleaded gasoline, methanol cost $4.00 - $5.00 a gallon.
Q: What type of performance can I expect from making the switch to E85?
A: It has been our experience that E85 with its 105 octane rating and high tolerance to detonation is superior to premium pump gas and equal to and in most cases better than 110 octane race gas. We picked up a tenth of a second and 2 to 3 miles per hour in the eighth mile after switching to E85 from 110 race gas and our engine runs 20 degrees cooler.
Q: Dont I have to replace all the rubber in my fuel system so it want be eaten up by the alcohol in E85?
A: NO!!! We started out on this journey with a complete gasoline system. We upped the flow 30% to compensate for the lower heat energy output of ethanol and left everything else the same just to see the effects. We switched to E85 at the end of the 2006 racing season and to date we have found zero deterioration or corrosion anywhere in our fuel system. We leave it in the system all the time. We dont drain anything between races or use any type of fuel lube.
Q: How much compression can I run with E85 fuel just the way it comes out of the pump at my local station?
A: This is one question I don't have a concrete answer for. We are running it in engines up to 14.5:1 naturally aspirated and some fairly high boost forced induction applications with great results. I have seen charts that draw the line at 16:1 but there again I just dont have the data yet of a failure directly due to the compression limit of pump grade E85 being reached.
Q: Where can I find E85 in this area?
A: You can find E85 in any area by logging onto www.e85fuel.com and just click on your state for a list of stations that carry it.