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Thread: 98 fuel change to 95

  1. 05-05-2013, 04:56 AM #1
    frankmar
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    98 fuel change to 95

    I've been running 98 octane fuel in my 69s MFI and now changed to 95 octane. I think I see idle go down by ablu 100 rpm and maybe a bit of a loss of power. Is this just psicological or real? do I have to change the air or fuel mixture?
    Early 911S Registry #2590
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  2. 05-05-2013, 10:42 AM #2
    Flieger
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    If it is only gasoline in both cases it is just your imagination and no mechanical changes are necessary. If the lower octane has more alcohol in it than the higher octane, then the effect could be real and you might want to slightly tweak the mixture.
    1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
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