MR12 or U4.4?

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MR12 or U4.4?

This is a discussion about MR12 or U4.4? within the Tuning Performance section, where you will Engine mods-Tuning talk for all Sport Bikes Every little bit helps!; Looked on here couldn't find a answer. What fuel makes better power ? Money isn't a problem to put it up front as far as the difference in price on the two. Set up would

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    Default MR12 or U4.4?

    Looked on here couldn't find a answer. What fuel makes better power ? Money isn't a problem to put it up front as far as the difference in price on the two.
    Set up would be n/a motor, ported and decked head, thinned head gasket, with cams. So what fuel is best for this set up? Bike will be dyno tuned. Thanks in advance
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    MR12 period
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    Any major pros/cons to either also
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    if runnin stock bottom end as sounds like from listed work done
    mr12 will be best power at 87 oct,
    for a faster burn for the less comp motor
    mr12 same oxy content but higher 98 oct
    u4 even more oct,,less oxy

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    I tried u4.4 last year and it ran the same as pump fuel in my bike, the mr12 picked me up .10 in the 1/4 mile
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    Quote Originally Posted by johnmiffco View Post
    if runnin stock bottom end as sounds like from listed work done
    mr12 will be best power at 87 oct,
    for a faster burn for the less comp motor
    mr12 same oxy content but higher 98 oct
    u4 even more oct,,less oxy
    oooppps
    meant to say mrxo1 was same oxy content but higher 98 oct
    far better than u4

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    flush tank and system after use with pump gas
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    dont leave it in your tank

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    Quote Originally Posted by BATTMAN View Post
    dont leave it in your tank
    Heard that.....don't feel like replace fuel pump or anything like that lol
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    Quote Originally Posted by BATTMAN View Post
    dont leave it in your tank
    Heard that.....don't feel like replace fuel pump or anything like that lol
    THE BIRD IS THE WORD

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    Quote Originally Posted by BATTMAN View Post
    dont leave it in your tank
    Heard that .....don't feel like replace fuel pump or anything like that lol
    THE BIRD IS THE WORD

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