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91 octane?

Discussion in '5 Lug' started by adam2180, Jan 8, 2012.

  1. Jan 8, 2012 at 4:53 PM
    #1
    adam2180

    adam2180 [OP] Well-Known Member

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    Is it worth while using 91 octane gas in my 5 lug?
     
  2. Jan 8, 2012 at 7:29 PM
    #2
    Joels98taco

    Joels98taco Well-Known Member

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    i doubt it will make much of a diference with such a small engine with no upgrades. but try it if you want? :confused:
     
  3. Jan 8, 2012 at 7:31 PM
    #3
    whippersnapper02

    whippersnapper02 Well-Known Member

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  4. Jan 8, 2012 at 7:32 PM
    #4
    humanoid

    humanoid bite me

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    It wouldn't hurt, at least your wallet will be a bit lighter.
     
  5. Jan 9, 2012 at 12:00 PM
    #5
    adam2180

    adam2180 [OP] Well-Known Member

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    I have always used it because I have been told its cleaner gas.
     
  6. Jan 9, 2012 at 12:01 PM
    #6
    98tacoma27

    98tacoma27 :POOPCORN: Thor

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  7. Jan 9, 2012 at 12:01 PM
    #7
    whippersnapper02

    whippersnapper02 Well-Known Member

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    It isn't cleaner.
     
  8. Jan 9, 2012 at 2:21 PM
    #8
    adam2180

    adam2180 [OP] Well-Known Member

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    I'm listening.......
     
  9. Jan 15, 2012 at 4:48 PM
    #9
    adam2180

    adam2180 [OP] Well-Known Member

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    I filled it up with regular and didn't notice any difference.
     
  10. Jan 16, 2012 at 1:11 PM
    #10
    JDCPA

    JDCPA Well-Known Member

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    The computer on the 4.0 engine differentiates between octane and adjusts its performance accordingly. THe 2.7's computer does not. Any octane in excess of 87 is wasted money.
     
  11. Jan 16, 2012 at 1:40 PM
    #11
    adam2180

    adam2180 [OP] Well-Known Member

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    Yup, I'm a believer... Or a non-believer, you know what I mean.
     
  12. Jan 22, 2012 at 8:06 PM
    #12
    emt49126

    emt49126 Member

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    Thank you. I put high octane in the other day. Needless to say, I complain that it costed me 30.00 for less then 9 gallons. What is your thoughts on gas additives?:confused:
     
  13. Jan 22, 2012 at 8:35 PM
    #13
    whippersnapper02

    whippersnapper02 Well-Known Member

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    Only flex fuel vehicles have an octane sensor. All others rely on knock sensors or nothing but base maps. The 4.0 has knock sensors and it adjusts ignition timing according to how much knock is present. If your engine is excessively knocking on 87 then you have other issues.
     
  14. Jan 22, 2012 at 10:19 PM
    #14
    the.sight.picture

    the.sight.picture .45%er

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    im pretty sure its 89 octane if u are running the v6. I can tell the differance when driving...much less torque
     
  15. Jan 22, 2012 at 10:59 PM
    #15
    whippersnapper02

    whippersnapper02 Well-Known Member

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    Sorry but butt dynos are not accurate.
     
  16. Jan 22, 2012 at 11:09 PM
    #16
    VanCity4x

    VanCity4x Out fer a Rip eh Bud

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    I get 3+ mpg better using 91 on my 4.0. Ive been told the same thing. Wouldnt make a difference in 2.7L
     
  17. Jan 22, 2012 at 11:27 PM
    #17
    Desert Rat

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    Interesting...
     
  18. Jan 22, 2012 at 11:30 PM
    #18
    Warhorseforever

    Warhorseforever Will The Thrill

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    No. Search for the other threads present on the subject and read for days.
     
  19. Feb 18, 2012 at 11:53 AM
    #19
    lmikk12

    lmikk12 Active Member

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    Sorry if i am a little late on this but octane ratings on fuel is how they stand up to pressure and heat before igniting themselves,with a higher compression ratio you have to run higher octane fuel so there is no detonation. higher octane fuel will not give you any more power if that is what you are looking for.However using a lower octane fuel can cause preignition or detonation or "knocking" that is small enough that you won't feel it but enough for your motor to retard the timing to save itself, this results in lower mpg's and less power. all it takes is one very small ping, so 89 or 91 would be more of a preventative measure than anything else. This can happen in any motor high compression or low even with higher octane fuel, but its what 3 bucks a fill up, why not.
     
  20. Feb 18, 2012 at 12:37 PM
    #20
    whippersnapper02

    whippersnapper02 Well-Known Member

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    In some cases it can cause a power loss that's why not. Back in 2000ish when I used to subscribe to Sport Compact Car they tested a new Honda Accord V6 on 91 octane and they lost an average of 10 horsepower on the dyno runs. The car only called for 87 octane.
     
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