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89 octane gas in supercharged taco

Discussion in '2nd Gen. Tacomas (2005-2015)' started by YayAreaTaco0311, May 24, 2010.

  1. May 24, 2010 at 11:04 AM
    #1
    YayAreaTaco0311

    YayAreaTaco0311 [OP] Motivator

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    Hey,

    I have a supercharged Taco and the fuel door says to use premium fuel only. Just curious, what would happen if I used 89 octane? premium fuel is getting expensive here! =(

    Thanks.
     
  2. May 24, 2010 at 12:33 PM
    #2
    Krazie Sj

    Krazie Sj Resident Jackass

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    Engine knock.

    Don't want to pay for premium? I pay shipping for your Supercharger then you can throw 89 in there all day long.
     
  3. May 24, 2010 at 12:36 PM
    #3
    T0LLPHR33

    T0LLPHR33 Well-Known Member

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    you took the words right out of my mouth...

    send me the s/c...i'll give you $1.01 more then he will...lol
     
  4. May 24, 2010 at 12:57 PM
    #4
    Krazie Sj

    Krazie Sj Resident Jackass

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    Respect your elders sonny.

    Or I'll break my hip on your face.
     
  5. May 24, 2010 at 1:52 PM
    #5
    c0astie31

    c0astie31 TACO SUPREME

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    i have run them all, i see no reason why, i run 89 in mine every tank, i have run 87 to with a bottle of lucas, no problems here
     
  6. May 24, 2010 at 1:54 PM
    #6
    MOT

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    i run 91 with no sc it helps the truck and it will last longer!
     
  7. May 24, 2010 at 1:55 PM
    #7
    tvbd56

    tvbd56 Epic Member

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    X2
     
  8. May 24, 2010 at 1:57 PM
    #8
    Zombie Runner

    Zombie Runner Are these black helicopters for me?

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    thats an old "wise" mans tale...:rolleyes:
     
  9. May 24, 2010 at 1:59 PM
    #9
    MOT

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    You get what you pay for i get better gas mileage when i run 91!
     
  10. May 24, 2010 at 1:59 PM
    #10
    High-Gear

    High-Gear Zombie Killer

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    Here 91 just dropped back to $2.79 from $3.15! I have to run Premium in three of my vehicles so I know the pain of paying for 91.

    In reality the .20 more per gallon on a 21 gallon fill up is only $4.20. If you burn through a tank a week, is it worth a few bucks to possibly damage your engine? Have one less Caramel Frapachino half-caf, mocha swirl a week and save your engine!
     
  11. May 24, 2010 at 3:01 PM
    #11
    LBtaco

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    now thats fucking funny!!:D
     
  12. May 24, 2010 at 3:05 PM
    #12
    ktmrider

    ktmrider Senior Member

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    I run 91 octane in my supercharged taco, do it. Just do it.

    [​IMG]
     
  13. May 24, 2010 at 3:07 PM
    #13
    98_Mud_bug

    98_Mud_bug 98_mud_bug

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    yea it says premium only for a reason.. you get engine knock, you lose performance and get worse gas mileage..
     
  14. May 24, 2010 at 3:16 PM
    #14
    Brunes

    Brunes abides.

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    This is one of those "pay to play" things- It's really not a good idea to test out if 89 will work.
    It might be just fine for a while- Find the right combination of weather and gas- and you might be paying for an engine rebuild...Just that fast.

    @ 2-3 bucks more a tank (max)- You'd have to fill up about 1000 times or more before you'd save enuf money to pay for an engine rebuild....
     
  15. May 24, 2010 at 3:20 PM
    #15
    yosh2000

    yosh2000 Well-Known Member

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    really...helps the truck and make it last longer huh...do you even know what the octane readings mean?!!

    there is absolutely no reason to run anything more than 87 in our NA trucks. forced induction trucks need the higher octane to prevent knock (ie. predetonation).

    as as to your "better mileage" theory, there is no change in the energy content between 87 and 91 octane fuel...its simply a measure of the fuels tendency to burn in a controlled manor.

    in conclusion, OP, as others have stated, your running the higher octane fuel to control the burn in the cylinders and not knock...this will extend the life of your engine when you run the SC...
     
  16. May 24, 2010 at 3:42 PM
    #16
    ASE_MasterTech

    ASE_MasterTech Well-Known Member

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    Regular (87 octane rating) fuel is fine (IMHO) in stock Toyota engines.
    However;
    To prevent uncontrolled detonation (pre-ignition), higher octane ratings are required whenever you increase cylinder pressure, whether it's via supercharging, turbocharging, higher compression pistons, reducing head deck height, etc...
    I believe the matter of "octane" requirements & the associated reasons have been discussed extensively in previous threads.
    Do a search for "octane"..
     
  17. May 24, 2010 at 8:00 PM
    #17
    CtTaco

    CtTaco Well-Known Member

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    the trd website claims you can run lower than 91 octane in a supercharged application, but "performance will be reduced" also as a side note, the VVT-i system in our trucks DOES perform better with higher octane fuels ( not just better gas mileage, but better performace) but you can run any octane in a NA engine (ive had both...)
     
  18. May 25, 2010 at 6:53 AM
    #18
    Zombie Runner

    Zombie Runner Are these black helicopters for me?

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    Do you really get better gas mileage or are your driving habits a little different when running different fuels?

    I filled up yesterday with 87octane for 2.65 a gallon for a total of 45.05.
    For 91octane it would have cost 50.15 to fill up. Would 10 more miles a tank make up that 5 bucks? I fill up once a week usually and that would be an extra 20 bucks a month...I just dont really know if it would be worth it
     
  19. May 25, 2010 at 1:52 PM
    #19
    ASE_MasterTech

    ASE_MasterTech Well-Known Member

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    I am sorry, but I disagree with this statement.
    Simply put, VVT (Variable Valve Timing) systems are meant to increase efficiency in engines via managing 'pumping losses' while maintaining 'normal' engine performance values, not to increase performance.
    This is done by decreasing 'cylinder pressure' (ie-shortening the compression cycle) via 'valve open' durations during periods of low load (where most vehicles are normally operated) & returning to the 'normal valve duration cycle' of an engine, when under load.
    The trade-off for the 'efficiency state' of VVT is a loss of engine torque, as that is what occurs with reduced cylinder pressures. However, this operation is managed electronically & happens so quickly that any torque loss is 'transparent' to the vehicle operator.
    The only performance gains that VVT technology provides is that the Manufacterers did not have to completely dog down engines to meet Government C.A.F.E standards for efficiency for the vehicles they sell.

    As I have stated previously, the only time you would REQUIRE premium fuel is when you INCREASE cylinder pressure one way or another (supercharger, turbocharger, high compression pistons, etc...)
     
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