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  1. #21
    Registered onesickpantera's Avatar
    My Boats:
    1999 Pantera 24 Sport
    Join Date
    Feb 2005
    Quote Originally Posted by Turbojack View Post
    I may have the wrong motor. I think this motor runs slower with 93 then 87. The ecm would run the motor just before detonation. With 93 the ecm would not see any sign of detonation from the knock sensor and would think the knock sensor was bad, and run with reduce timing, thus giving less performance that 87 octane.
    So you're saying when there is no knock the ECM pulls timing because it thinks the sensor is faulty???

  2. #22
    Gold Member Gold Member Turbojack's Avatar
    My Boats:
    2003 Eliminator 30' Daytona
    Join Date
    Sep 2001
    Houston, TX, USA
    Quote Originally Posted by onesickpantera View Post
    So you're saying when there is no knock the ECM pulls timing because it thinks the sensor is faulty???
    Motor was a 454, not sure what year this was a problem but yes. ECM ran the timing on the verge of detonation. When it thought it should see detonation and did not, it backed the timing way up.

  3. #23
    My Boats:
    2008 32 SSR; 1999 26 PQ Legend
    Join Date
    Feb 2006
    Woodbury, NJ
    87 octane for those engines.

  4. #24
    Charter Member # 55 Charter Member Griff's Avatar
    My Boats:
    ..........32........... Active Thunder
    Join Date
    Oct 2000
    Quote Originally Posted by JMS322 View Post
    There is NO advantage to running premium 93 octane fuel in an engine that calls for 87 octane. In fact it is proven that it may even produce less hp than the 87 octane, therefore may be a tad slower. It does on the other hand smell a lot better.

    All higher octane will do is make your transom sooty from not burning as completely.

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