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Octane and performance

Discussion in 'General Explorations!!' started by Peter Westling, December 7, 2004.

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    1. Peter Westling

      Peter Westling Active Member

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      City, State:
      Rosersberg, Sweden
      Year, Model & Trim Level:
      '93 XLT
      Hi all.
      I think the normal gas in US is 87 - 89 octanes, right? We have unleaded 95 96 and 98 here in Swe. How does that affect the engine in a hp view? Is it noticable? Can I adjust the computer for a specific octane and make the engine more efficient?
       
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    3. glfredrick

      glfredrick Well-Known Member

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      Typically, unless you have one of the Crane adjustable plug in jobs, there is no other way to adjust your computer except to change the chip.

      There isn't really a HP difference from running higher octane gas, except that you can run a bit more advance on the timing without detonation. Your Ex should have a knock sensor that automatically backs off the timing if it hears detonation (pre-igniton of the gasoline mixture while the piston is still on the upstroke), which will cut a tad of the hp out of an engine, but nothing really serious.

      BTW, You can get a higher grade of gasoline at most stations - you just have to pay for it... Most pumps feature 3 grades - 87 - 89 - 93 or some combination like that. Some even have more - but they are sort of hard to find while traveling - sort of luck of the draw. You can also run an octane booster if needed... I do that when I wheel my truck so that it has what it needs when it gets lugged sometimes. I want all the power I can get in certain circumstances.
       
    4. Maniak

      Maniak Moderator-Stock 91-94 Staff Member Moderator Elite Explorer

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      Don't forget.. Octane is measured (displayed at the pump) differently in different countries... I haven't been able to find a good link explaining it..

      It the states we use the average of the 2 types of octane measurements (RON + MON)/2 The way I understand it, some countries only show one of the octane numbers ( I can't remember which)...

      ~Mark
       

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