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What is the highest percentage of Ethanol

Discussion in 'Gen 2 Prius Main Forum' started by madams, Mar 22, 2005.

  1. madams

    madams New Member

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    Anyone know exactly how much ethanol that the Prius can burn without messing things up. It appears that the state of IL is going to start really pushing that stuff.
     
    #1 madams, Mar 22, 2005
  2. D'Tan

    D'Tan New Member

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    Well, from what I've seen at john1701a's website, it'll do E10 (10%) without any trouble. And according to this website, http://www.creedproject.org/stream_v7n2.pdf , it'll run on E85 (85% ethanol), BUT they don't know about the long term effects on the engine. And the check engine light was on during the testing.
     
    #2 D'Tan, Mar 23, 2005
  3. DaveinOlyWA

    DaveinOlyWA 3rd Time was Solariffic!!

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    my area of WA state has used E10 for over 15 years now. i still get EPA in the summer time so your car will be fine with that.
     
    #3 DaveinOlyWA, Mar 23, 2005
  4. madams

    madams New Member

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    THanks for the post on the E85 fuel, it appears there are some issues with it and the Prius. Currently the state of IL allows 10% ethanol in the fuel and neither of my Prii appear to be affected with that blend. I know there are some car and small trucks (ford I believe) that have that little green leaf on the outside of their cars that signifies that they can burn E85 fuel. I was just wondering if the Prius was a problem . . . it appears it can't with out some modifications.
     
    #4 madams, Mar 23, 2005
  5. jayman

    jayman Senior Member

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    Good article. I think if Toyota applied a bit of their R&D, they could easily develop fuel/ignition and Mode maps to compensate for E85. Since both the short-term trim and long-term trim appeared to indicate too lean, that's why the cold start emissions were more: the computer was enriching too much.

    Overall, without modification, E85 vehicles can be hard to start especially 0 F or colder. You usually have to "overfuel" on startup to minimize or eliminate this problem.

    I believe a compensated PCM map, utilizing a sensor input from the tank to detect n-heptane, could easily trigger a transistion from the stock map to the E85 map.

    More info at:

    http://www.westbioenergy.org/reports/55032.../55032final.htm
     
    #5 jayman, Mar 23, 2005
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