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Higher octane

Discussion in '4 Cylinder' started by CometKat, Aug 7, 2008.

  1. Aug 7, 2008 at 7:06 AM
    #1
    CometKat

    CometKat [OP] Well-Known Member

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    Anyone run a higher octane than the recommended 87? Does it make a difference?
     
  2. Aug 7, 2008 at 7:08 AM
    #2
    mws4ua

    mws4ua I'll try being nicer if you try being smarter.

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    higher octane = waste of money
     
  3. Aug 7, 2008 at 7:14 AM
    #3
    beastlytaco

    beastlytaco This is TW. One never knows what is a joke anymore

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    yeah higher octane gasoline is only recommended for high compression engines. like ferrari, bmw, and so on. some people on here run it on tacomas. if your engine is giving you you some knocking, try running seafoam through it. itll make your truck smoke like hell if the injectors are dirty.
     
  4. Aug 7, 2008 at 7:20 AM
    #4
    Ridgerunner

    Ridgerunner Well-Known Member

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    Not really. There is a marginal yet factual difference in performance between 87 and 91. You have 'knock sensors' in your engine. When you run 87, your ecu will retard your timing to eliminate knock ("pinging" or "detonation" are other terms for it) thereby losing a small amount of power. when you use 91 (I wont use anything else) you are running full advance timing and are utilizing all the power your engine has. The price differential to me is small. IMO, and this is MY opinion only, if you run 87 and the timing is being retarded by the ecu resulting in slight loss of power, then you will tend to use more throttle to get to speed, hence mileage will go down slightly-hence more fuel burned. IMO, it is better to run 91 at the slightly higher cost because the benefit is the maximum timing:)
     
  5. Aug 7, 2008 at 7:21 AM
    #5
    beastlytaco

    beastlytaco This is TW. One never knows what is a joke anymore

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    wow. good info. i didnt know that. +1
     
  6. Aug 7, 2008 at 7:27 AM
    #6
    Ridgerunner

    Ridgerunner Well-Known Member

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    Whatsup buddy:) that is what I have learned both here and researching on the net. When Chris4x4 comes on later I will run this post by him and verify my accuracy because he IS the man on this stuff-but I'm confident in my post:) Besides, I noted an uncomfortable difference in "pickup" in my truck between the two octanes-which is what prompted me to research in the first place!
     
  7. Aug 7, 2008 at 7:33 AM
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    beastlytaco

    beastlytaco This is TW. One never knows what is a joke anymore

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    yeah thats mainly how i learn stuff. performance stuff that is. i just read posts and listen to you guys and i do some researching on my own.
     
  8. Aug 7, 2008 at 7:42 AM
    #8
    Brunes

    Brunes abides. Staff Member

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    When you run seafoam thru your engine do you use all three of the methods....or just a selection of Gas/Oil/Intake.

    I used it on my scion- Got it in the Oil and Gas....Not sure how to introduce it to the intake tho....Suggestions?
     
  9. Aug 7, 2008 at 9:37 AM
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    dually

    dually Low and slow

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    +1 on the seafoam, good stuff
     
  10. Aug 7, 2008 at 9:49 AM
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    klown

    klown Tacoma World Ring Leader

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    anybody have 0-60 and 1/4 mile times with 87 vs 91 octane?

    Or maybe dyno numbers?
     
  11. Aug 7, 2008 at 9:49 AM
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    eordonez

    eordonez Living vicariously through mjp2

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    That's a very good point there, im wondering if anybody has tried this with their scangauge, check consumption with a tank of 91 and another with 87.....
     
  12. Aug 7, 2008 at 9:57 AM
    #12
    CometKat

    CometKat [OP] Well-Known Member

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    I am going to try the 91 on the next fill up. I don’t detect any pinging (which I shouldn’t with the modern system) but I drive up mountain passes regularly and could use all the power I can get out of my 2.7.
     
  13. Aug 7, 2008 at 10:06 AM
    #13
    Janster

    Janster Old & Forgetful

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    I run 87..... and if I ever haul or tow anything long distance, I'd use midgrade. The cost of the hi-grade just isn't worth whatever benefits it'll give you unless you're hauling/towing/ or racing.

    If I'm gonna gain any *power* in anything worth putting 93 in....is in our corvette. It actually requires it. :D
     
  14. Aug 7, 2008 at 5:03 PM
    #14
    beastlytaco

    beastlytaco This is TW. One never knows what is a joke anymore

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    no i have mainly just poured it into the gas tank. for oil i use lucas oil treatment. it lubricates rings and it bonds more easily. it has a very thick consistency. we run it in all of aour cars. a matrix and the tacoma. i just use regular 87 octane. as for the intake im not sure either.
     
  15. Aug 7, 2008 at 5:12 PM
    #15
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    The Tacomas 4.0 has a compression ratio of 10 to 1. Thats pretty high for a truck. :)
    This is correct. Sometimes the cost of the more expensive fuel is a factor for the end user. FWIW, the newer 4.0 1GR-FE is rated at 236 h.p. 266 lb/ft. on 87 octain and 239 h.p. 278 lb/ft. on 91. a gain of 12 lb. ft. of tq for a few cents more per gallon. I have done some comparos with different Oct. of fuel. With my Tacoma, when towing my boat, useing 87 I get around 14.5 mpg.. 89 and towing the same trip I get 16.1 mpg. I havent tested 91 yet. I find the extra performance worth it. Not all vehicles respond this way. My Dodge got WORSE mpg when run on 91 oct. vs. 87, but higher Octain does seem to benafit the Tacomas. :)
     
  16. Aug 7, 2008 at 5:31 PM
    #16
    Ridgerunner

    Ridgerunner Well-Known Member

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    Thanks Chris:) well guys there you go-straight from the guy who actually puts claims and theories to the test! Now that gas prices have dropped a bit, it's a good time to do your own test:)
     
  17. Aug 8, 2008 at 9:37 PM
    #17
    blackonwhite

    blackonwhite Well-Known Member

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    i have an 06 4 banger regular cab manual and i can tell a big difference between the 87 and 93 octane....where i live its 93 not 91...that could be why.. but with 87 there is no acceleration wat so ever.. but if i put 93 in it its pulls like crazy... could be my imgaination but i am pretty sure its makes a difference in my truck and for 10 cents more why not
     
  18. Aug 9, 2008 at 3:39 PM
    #18
    Ridgerunner

    Ridgerunner Well-Known Member

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    I would LOVE a good tank of 93! I miss it! It's been 91 for quite a few yrs out here-those extra 2 points would be sweet:)
     
  19. Sep 3, 2008 at 1:36 PM
    #19
    CometKat

    CometKat [OP] Well-Known Member

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    I ran 91 for my last fill-up with some interesting results. Keep in mind I drive mostly city and mountain passes, so no easy highway cruising. With regular my last mileage was 19.10. With 91 my mileage jumped up to 21.11. If you plug the numbers into a spreadsheet it works out that it cost me $3.29 more to fill up with 91 but because of the better mileage I got an extra 33.2 miles out of the tank or $6.13 worth of gas. So my net savings was $2.84 for a tank of gas. Plus I think the truck runs stronger up the mountain passes.
     
  20. Sep 3, 2008 at 6:16 PM
    #20
    luk8272

    luk8272 Poodoo

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    ComeKat thats impressive. I haven't gotten my truck into the 20's in quite some time. Until this last fill up in Texas, all the had was super and I got 21.2 mpg.
     
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