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Thread: Manual says 87 octane recommended.

  1. #41
    I spend too much of my life on FST! waltermitty's Avatar
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    Quote Originally Posted by Unfitproduct View Post
    no knocking or pinging?
    Nope, not even when using it hard. Probably would get a little more power using 93 and I have used 93 in the past.

  2. #42
    FST Member Yar987's Avatar
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    Quote Originally Posted by Unfitproduct View Post
    no knocking or pinging?

    The ECU will vary the timing based on the fuel. It'll run whatever fine.


    From the Focus St Supplemental manual:

    "OCTANE RECOMMENDATIONS
    Regular unleaded gasoline with a
    pump (R+M)/2 octane rating of 87 is
    recommended.
    Some stations offer
    fuels posted as Regular with an
    octane rating below 87, particularly
    in high altitude areas. Fuels with octane levels below 87 are not
    recommended. Premium fuel with an octane rating of 93 or higher will
    provide improved performance and is recommended for severe duty or
    high performance usage."



    Meaning when the engine heats up all the way, your timing will vary to avoid potential detonation/pre-ignition when not running higher octanes
    Last edited by Yar987; 01-31-2014 at 07:02 AM.
    Airwolf79 likes this.

 

 
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