87 octane in tiburon gt v6

Discussion in 'Hyundai Coupe / Tiburon' started by Jeff Hodges, Jul 23, 2004.

  1. Jeff Hodges

    Jeff Hodges Guest

    anybody here using the 87 octane gas in their tibby? I have been using
    93 only, but with the prices and the manual saying 87 will work I am
    thinking about it.


    2003 GT-V6
     
    Jeff Hodges, Jul 23, 2004
    #1
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  2. The Tiburon's engine is not a high-compression engine and is designed to
    run on 87-octane gas. There is no reason to use 93-octane gas unless
    you really like paying more money to fill the tank. I've been using
    87-octane gas in my 2003 V6 Tiburon for 1.5 years; no knocks, pings, or
    other signs of premature combustion.

    --
    Matt G|There is no Darkness in eternity/But only Light too dim for us to see
    "We should have a policy against using personal resources for company
    business." "The Company didn't pay for these pants, so I'm taking them
    off at the door!" --J. Moore and A. DeBoer, the Monastery
    Hire me! http://crow202.dyndns.org/~mhgraham/resume/
     
    Dances With Crows, Jul 23, 2004
    #2
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  3. Jeff Hodges

    Jason Guest

    The compression ratio is kinda of high and any other manufacturer
    would have recommended 89 instead of 87. Hyundai is getting around
    the problem of knocking by keeping the engine flooded with gasoline
    all of the time. My 2.7L Sonata runs an A:F around 10.5:1. I've been
    thinking about retuning the fuel maps and running 89. More power and
    better mileage at the cost of an extra $1.50 per fillup is fine by me.

    I'll agree though, 93 octane is a waste of money.
     
    Jason, Jul 23, 2004
    #3
  4. Jeff Hodges

    hyundaitech Guest

    If you were running 10.5:1, your check engine lamp would be on because the
    oxygen sensors were reading rich all the time. The car's oxygen sensor
    allows the computer to adjust fuel to minimize harmful emissions.
     
    hyundaitech, Jul 23, 2004
    #4
  5. Jeff Hodges

    hyundaitech Guest

    Use 87 octane. All the time. Every piece of information I have from
    Hyundai is that higher octanes will actually cause the car to run WORSE.
     
    hyundaitech, Jul 23, 2004
    #5
  6. Jeff Hodges

    Shane M Ryan Guest

    I use 93. I tried 87, no knocks, but definitely calculated less gas mileage
    and less peppiness.
     
    Shane M Ryan, Jul 23, 2004
    #6
  7. Practically everything I've heard indicates that Hyundai engines run
    really rich. hyundaitech, is what Jason said true, and the high fuel
    content is there only to reduce knocking, or are there other reasons for
    it?
    Maybe there's a flaw in how Jason measured the ratio, or he made a typo,
    or something. Jason, how'd you get the 10.5:1 numbers?
     
    Dances With Crows, Jul 23, 2004
    #7
  8. I ask you again: Got hard numbers for this claimed increase in
    "peppiness"? The first time you made this claim, on March 31, 2004, I
    asked you for hard data in Message-ID
    202.dyndns.org .
    You never responded. It's not difficult; fill the tank with 87-octane,
    measure 5 or 6 0-60 or 1/4-mile times, record. Repeat with 93-octane.
    If there's a stastically significant difference in the times, one grade
    of gas is better than the other for acceleration. If there's *not* a
    statistically significant difference, you're talking rubbish and/or
    experiencing the placebo effect.

    Measurement accuracy and precision are vital here, since the differences
    are going to be miniscule. I have plenty of time slips from the times
    I've been to the dragstrip. Next time I go, I'll put 93-octane gas in
    the tank, see what the time slips say, and post the results to this
    newsgroup. I don't think there'll be a statistically significant
    difference, but I'm willing to conduct the experiment and have my data
    publically reviewed. Are you willing to do the same? The more data
    points, the better, after all....
     
    Dances With Crows, Jul 23, 2004
    #8
  9. Jeff Hodges

    Shane M Ryan Guest

    It's fine if you don't believe me. If you don't know what a spongy gas
    petal feels like, you won't know the difference. I lost 2 miles per gallon
    with 87 octane.
     
    Shane M Ryan, Jul 24, 2004
    #9
  10. How could that be? I can understand that using fuel with higher than
    necessary octane provides no benefit and is a waste of money, but how
    could it make an engine run worse?
     
    Brian Nystrom, Jul 24, 2004
    #10
  11. Jeff Hodges

    hyundaitech Guest

    Sorry about the lack of context in some of my posts. I don't have the
    ability (that I know of) to cut and paste previous posts into mine.
     
    hyundaitech, Jul 24, 2004
    #11
  12. Jeff Hodges

    hyundaitech Guest

    It doesn't burn as fast. If the engine's compression is low enough it can
    have issues with properly igniting the fuel. If you have a little bit of
    carbon on the valves (an older car), it gets held as a liquid in the
    carbon, and plays having with the cold operation logic worse than 87.
    About 10 years ago, Hyundai had a cold start problems with Elantras,
    carboned valves, bad hesitation for a minute or so. If the customer was
    running premium, it REALLY got bad.
     
    hyundaitech, Jul 24, 2004
    #12
  13. Jeff Hodges

    hyundaitech Guest

    I'd be interested in seeing your comparison. Despite oil company claims,
    everything of repute I've heard indicates there's no performance
    difference with 93 vs. 87 if the engine was designed to run on 87.
     
    hyundaitech, Jul 24, 2004
    #13
  14. It's your Usenet client's fault. Nobody (not even Google) has managed
    to make a web-based Usenet frontend that doesn't suck. So, for a better
    Usenet-reading and posting experience, get a good client. There are
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    you're stuck on Windoze, Forte Free Agent is probably the best
    free-as-in-beer client though you can use Mozilla as well. Good clients
    include "killfile" functions that allow you to filter out any messages
    posted by trolls/idiots. These functions are a must for reading many
    groups--not necessarily this one, since it's pretty low-traffic and
    there are fewer idiots here than on Usenet in general.

    Most ISPs have their own newsswervers, and the name of the server is
    usually "news.$ISP", so you'd use "news.comcast.net" if your ISP is
    Comcast. ISP newsswervers are usually not well-maintained and
    propagation can be iffy. news.individual.net is a free newsswerver
    that allows posting and is fairly well-maintained. It only carries text
    newsgroups like this one, so you'll have to get your
    alt.binaries.pictures.erotica.redheads fix elsewhere :) . Get an
    account by going to http://news.individual.net/ and signing up. HTH,
     
    Dances With Crows, Jul 25, 2004
    #14
  15. Jeff Hodges

    Steve W. Guest

    Not very likely in a stock engine. Unless you have a LOT of problems in
    that engine.
     
    Steve W., Jul 25, 2004
    #15
  16. Very interesting; thanks for the explanation. I'm too cheap to run
    higher octane fuel than necessary, so I guess I'm safe. ;-)
     
    Brian Nystrom, Jul 28, 2004
    #16
  17. Unless he's got a problem with pre-ignition and the ECU is retarding the
    timing to compensate, I can't see how one could possibly get better
    performance or mileage with premium fuel. I'd suspect this is a case of
    the "placebo effect". If he actually IS getting better performance, it
    would indicate a problem with the engine or engine management system.
     
    Brian Nystrom, Jul 28, 2004
    #17
  18. Jeff Hodges

    Car Enthusiast

    Joined:
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    You never posted your results.....
    Left me in a 15 year cliffhanger.
     
    Car Enthusiast, Jun 1, 2019
    #18
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