I plan to run at least 28lbs. The green shines w/ the higher boost so the more the merrier me. Now the question is will I need a double pumper?

 

You wont need to run a second walbro but you will need some pretty beefy injectors. On my IX that we tested on E85 we need 880cc injectors and one walbro pump. the car made decent power but not as much as what regular 100 octane would of made. Dont get me wrong, I loved the car but If I had to do it all over again I would wait a little while. Right now E85 is still relatively new, not every station carries it and not ever station carries the same kind. The fact that you live in a cold climate makes it even worse as you now have to worry "Am I getting E85, or am I getting E70 (winter Blend)?" I think until it becomes more widely available at the reputable stations I would either steer clear or be very cautious. GET A WIDEBAND and always look at it while you are at WOT.

Eric

 

Yes you will. That's not to say you can't run it with one, you absolutely can, but to maximize the potential and be safe you need a dual unit.

 

You can get unleaded 100 and leaded 110 in LI NY , I've being running a mix of 100/110 when racing. There's a gas station on Rt 112 north of the LIE but they only sell 100 and there is another Cam 2 pump in West Hempstead exit 17 south of the Southern State they carry both 100 and 110.

 

E85 has better cooling because of the alcohol. This allows you to run higher boost and more advanced timing. Stoich for E85 is about 9.7 as opposed to 14.5 for regular gas. Gas has more energy per unit but because of the lower stoich number, you can and need to run more E85 to get to that stoichiometric level. This means that the amount of energy per charge is basically equal. However you typically get cooler intake temps and a much less tendancy to knock (hence the higher equivalent octane rating). I would go with E85 not because you can get more power necesarrily but because you can get safer power (IMO).

 

according to this official web site http://www.e85fuel.com/ E85 is 105 oct.

 

not exactly for sure but i think e85 has like 76,000 btu's where gasoline is like 125,000 btu's not total accuract....'ill have to get and old report i did in college though

 

True, but you have to run at least 40% more fuel on boost with E85 to match straight gas. So 76,000 x 1.4 = 106400 btu's. Plus from the additional fuel being burned, the cylinder temps are way colder which allow for more boost without pre-ignition. Last but not least, the extra fuel means more cylinder pressure, better spool, and more torque vs. gas.

 

Ethanol has ~ 76,000 BTU's per gallon
E85 has ~ 83,000
Gasoline has 114,000

You will mix that gallon with air, at stoich 14.7 parts of air for gas and only 9.8 parts of air for E85, therefore your gallon will be good for:
E85: 83,000 / 9.8 = 8,469 BTU's
Gas: 114,000 / 14.7 = 7,755 BTU's

E85 contains more energy in a mix than gas. It's quite simple.

Important thing to remember it doesn't matter how much energy a certain fuel contains - you can't burn just fuel, it has to be "diluted" with air. Think about nitromethane, it has what - 32,000 BTU's per gallon, so who would use that ****, right? Wrong - it only needs 2 parts of air to burn, making 32,000/2 = 16,000 BTU's in the mixture.