E85 in the 2.7t

[aLifeQuixotic]

What the consenus on running E85 in the 2.7t? It's a higher octane, so it wouldn't hurt to switch the car over to it, would it? I'm formulating how I want to build my car, and am now considering the engine build being E85 centric. -Brian

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[2k S4]

You should be ok, it is higher octane, but lower thermal reactivity, so less power. If you are going to run it a lot, & drive the car hard, I would Lemi it & add 5% more fuel.

[Fier Ringe]

Good luck with that. You need to research how turbochargers are effected by E85.

[Flip]

It's a higher octane so turbochargers react well to it. Less knock ftw!

[turbo kraut]

e85 would not be good in your turbo motor, becuase of this statement

The horsepower a given engine has when using E85 is comparable (or slightly higher in some instances) to gasoline. Depending on composition and source, E85 has an octane rating of 100 to 105 [3] compared to regular gasoline's typical rating of 87 for regular and 93 for premium. This allows it to be used in higher compression engines, which can lower emissions.
E85 gets approximately 25% fewer miles per gallon. In order to save money at the pump the price differentiation between gasoline and e85 would need to exceed 25%. Currently E85 is about 5-10% less expensive in most areas.[4] More than 20 fueling stations across the Midwest are selling e85 25%-40% cheaper than gasoline.[5]

[1972beast]

We run bio diesel in one of our company trucks and its always in the shop with some sort of problem. I dont think its worth it until the motor is 100% only bio not both. And me being in MT its really really hard to find E85 or bio.

[smdrcr_9]

no you cannot .. you need to compensate and run 30% more fuel at all times no matter what so you have to tune your ecu for it . yes it allows for more hp b/c of the higher octane but u have to compensate the fuel or u will kill ur car

[Superdug]

E85 is Ethanol right? at 85%? I have run straight methanol in my car before and that shit is fun as hell. i lags below 2000 rpm because the jets aren't big enough but once you get going it's a whole nother animal. and it is very cold so it keeps the motor cooler as well..

[turbo kraut]

E85 is an alcohol fuel mixture that typically contains a mixture of up to 85% denatured fuel ethanol and gasoline or other hydrocarbon by volume. On an undenatured basis, the ethanol component ranges from 70% to 83%. E85 as a fuel is widely used in Sweden and is becoming increasingly common in the United States, mainly in the Midwest where corn is a major crop and is the primary source material for ethanol fuel production; however as yet, there are still only about 800 filling stations selling E85 to the public in the US, and only one in Canada

[Burzum]

E85 is also more corrosive than Gasoline. I think there is a reason that manufactures specifically say a car is E85 compatible. I wouldn't risk it in my S4 especially with the stock MAF.