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Gas Octane

Discussion in '2nd Gen. Tacomas (2005-2015)' started by BreezyTaco, May 9, 2009.

?

Which fuel octane do you use?

  1. 87

    2,152 vote(s)
    64.5%
  2. 89

    453 vote(s)
    13.6%
  3. 91

    766 vote(s)
    23.0%
  4. Other fuel additives

    56 vote(s)
    1.7%
  1. Jun 19, 2013 at 4:37 AM
    #881
    kingston73

    kingston73 Well-Known Member

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    So nobody has any answer as to why the manual used to recommend high octane gas for better performance?
     
  2. Jun 19, 2013 at 4:39 AM
    #882
    J Gibson

    J Gibson Well-Known Member

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    At what point during the stroke is the piston in the cylinder programmed to be when the fuel is ignited on 87 octane? What does the program change when engine is operating on 93?

    Do the changes the programming makes change the effective compression ratio?
     
    Last edited: Jun 19, 2013
  3. Jun 19, 2013 at 5:56 AM
    #883
    gwos25

    gwos25 Well-Known Member

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    I think the debate here stems from the fact that Toyotas manual used recommend minimum of 87 octane, or 91 for increased performance. In this case, it has nothing to do with compression ratio, but ignition timing. Its possible the software was programed with more ignition advance to take advantage of 91 octane, with a "backup 87 octane" ignition map which it used when/if pinging or knock was detected. The new ford EcoBoost engines do the same. As a manufacture, it allows you to advertise great power/torque numbers, but still allow for the use of regular fuel. I have no idea if Toyota changed just the wording in the manual, or if they changed the tune as well. FWIW, the difference in mileage when using premium vs. regular could be attributed only to the fact that most regular (87) fuel is blended with ethanol and most top tier brands premium (91) is not. Being the ethanol blended fuel is less energy dense, you'll naturally get more mileage out of the premium.
     
    Last edited: Jun 19, 2013
  4. Jun 19, 2013 at 10:56 AM
    #884
    B11

    B11 Well-Known Member

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    You need to either go back to school or go back to the school you just graduated from with that 4.0 and get your money back because you obviously don't know the difference between Detonation and Pre-Ignition.

    Detonation always happens AFTER normal combustion. Pre-Ignition, just like its name, happens BEFORE the spark plug fires.

    Also, a Dynamometer uses a "Correction Factor" to adjust to a standard temperature.
     
  5. Jun 19, 2013 at 3:11 PM
    #885
    savedone

    savedone Well-Known Member

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  6. Jun 19, 2013 at 3:32 PM
    #886
    23dec2007

    23dec2007 Outlaw 525S member

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    87 when not towing/ around town...93 for towing and highways runs
     
  7. Jun 20, 2013 at 12:25 PM
    #887
    Dirtysouthmafia23

    Dirtysouthmafia23 Member

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    yes I know the difference. pre ignition melts parts detonation blows parts into pieces I know detonation happens after combustion I was trying to bring it down to lamence terms for the less mechanically inclined. I prolly used the wrong terms then I should have but no matter what terms you use the result is the same a higher compression engine can ignite with out a spark because it seperates the H from C in HC (hydrocarbon-also know as gas) with the compression. higher octane gas prevents this by making the H and C chemical bond stronger to where it requires a spark to combust. there it is in non lamence terms
     
  8. Jun 20, 2013 at 12:31 PM
    #888
    Dirtysouthmafia23

    Dirtysouthmafia23 Member

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    and what you are talking about is calculated horsepower. it is what the horsepower could be in perfect conditions but no one usually even looks at this numbe unless you are trying to sell an engine to someone across the country where there weather conditions are wrong.
    I do know we can dyno a nascar engine at 60 degrees F and get 900 hp (round numbers) and come back the next day at 50 degrees F and have 910 hp
    moral of the story no correction factor
     
  9. Jun 20, 2013 at 12:34 PM
    #889
    OZ-T

    OZ-T Thats what it is to be a slave ...

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    layman's terms
     
  10. Jun 20, 2013 at 1:21 PM
    #890
    worthywads

    worthywads Well-Known Member

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    Lamence :facepalm:

    NASCAR tech don't English.
     
  11. Jun 20, 2013 at 2:40 PM
    #891
    stump jumper

    stump jumper Well-Known Member

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    all has ethanol in town. When you get out of town you can find 87 without but higher has ethanol. Ethanol is used to increase the octane. It sucks because I like to run non-ethanol in boat but it takes 93. Some of the diffs that people see in MPGs could be dur to ethanol content
     
  12. Jun 20, 2013 at 6:11 PM
    #892
    stump jumper

    stump jumper Well-Known Member

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    you trying go blow that thing up? As far as the ethanol sticker placement on the pump it just happens to be near the 87 nozzle because that is where they put it. Since I own an older outboard running high compression I have done a lot of reading on ethanol and the impact on outboard motors. A lot of people around here who are serious about their boats use ethanol test kits. I can tell you most all premium has ethanol even at stations that sell ethanol free regular. Mid grade is a blend of the 2 at the pump.
     
  13. Jun 21, 2013 at 9:58 AM
    #893
    Dirtysouthmafia23

    Dirtysouthmafia23 Member

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    Lol so I can't spell "laymans"
    And yes NASCAR don't "teach" English
     
  14. Jun 21, 2013 at 10:01 AM
    #894
    Sandman614

    Sandman614 LRGRNR

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  15. Jun 21, 2013 at 3:50 PM
    #895
    B11

    B11 Well-Known Member

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    LMAO!!! That has to be one of the best excuses yet.

    Yeah, I always give incorrect information and contradict myself when I'm trying to make it easier for others to understand and I ALWAYS tell everyone how smart I am while I'm doing it. Mmhmm, sure you really knew the difference. ;);) Still LMAO!!!
     
  16. Jul 15, 2013 at 8:03 AM
    #896
    field76

    field76 Well-Known Member

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    Agree with Brunes, I'll through a tank of the 91/93 for road trips or what not.
     
  17. Jul 16, 2013 at 4:16 AM
    #897
    gocky

    gocky Well-Known Member

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    Minimum 91 octane is what's recommended by Toyota in my manual... I trust Toyota over a bunch of yahoo's and I own mine so I want it to last
     
  18. Jul 16, 2013 at 4:40 AM
    #898
    kingston73

    kingston73 Well-Known Member

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    I'm willing to bet money your manual does NOT say that, go back a page and look at my post. Research octane rating and octane rating aren't the same, yours has a recommended octane rating of 87. Nobody yet has answered my question about why the recommended octane changed after 06, but since 07 it looks like toyota has been saying you only need 87.
     
  19. Jul 16, 2013 at 6:08 AM
    #899
    tacomathom

    tacomathom Well-Known Member

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    Maybe Toyota stopped getting money under the table from the big oil companies. :confused:
     
  20. Jul 16, 2013 at 9:17 AM
    #900
    OZ-T

    OZ-T Thats what it is to be a slave ...

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    Mine says 87 and up

    Not 87
     
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