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Low Fuel Level Better Performance

Discussion in '1st Gen. Tacomas (1995-2004)' started by mass266, Aug 6, 2011.

  1. Aug 6, 2011 at 1:20 PM
    #1
    mass266

    mass266 [OP] New Member

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    I have a 2002 V6 Tacoma TRD. I have noticed for some time that the performance of the truck improves significantly when the fuel level goes down to 1/4 of a tank of fuel or lower. I have asked others to test this out and my brother confirmed that I was not imagining this.

    Does anyone have any ideas on what might be causing this? Has anyone else experienced this?
     
  2. Aug 6, 2011 at 1:27 PM
    #2
    cummins6speed

    cummins6speed Well-Known Member

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    How was this confirmed? Dyno?
     
  3. Aug 6, 2011 at 1:35 PM
    #3
    MacGyvR

    MacGyvR Well-Known Member

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    define performance.

    Off the top of my head, that is a significant amount of weight missing when you're low on fuel. I think it weighs 8 or 9 pounds per gallon.
     
  4. Aug 6, 2011 at 1:42 PM
    #4
    beefcake

    beefcake J-rob

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    A gallon of gas is just over 6 pounds IIRC so a full tank would weigh about 108 pounds, not enough to make a significant difference or even a noticeable difference in performance which has yet to be defined by OP and remember its not good to run your fuel low especially for performance because that is how the pump stays cool
     
  5. Aug 6, 2011 at 2:39 PM
    #5
    MacGyvR

    MacGyvR Well-Known Member

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    Sounds about right. I thought the pump was cooled by the gasoline moving through it, and not around it.
     
  6. Aug 6, 2011 at 7:01 PM
    #6
    mass266

    mass266 [OP] New Member

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    The performance difference and the operation of the engine is distinctly noticeable. Also weight can be factored out since I have driven it on a quarter tank with a load in the bed. The engine actually runs smoother.

    Fuel pump?
    Injectors?
     
  7. Aug 6, 2011 at 7:24 PM
    #7
    MacGyvR

    MacGyvR Well-Known Member

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    It doesn't intuitively make sense that anything performance related would change. The engine simply runs as long as it gets enough fuel. The second that stops happening, the engine cuts out and dies.

    Are you sure you're not just babying it or driving more carefully? My driving is nearly perfect when I"m running low on gas.
     
  8. Aug 6, 2011 at 7:34 PM
    #8
    TMW

    TMW Well-Known Member

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    Maybe it's a weak fuel pump. Just keep it at 1/4 tank or less and you'll be OK.
     
  9. Aug 6, 2011 at 8:29 PM
    #9
    x2468

    x2468 Well-Known Member

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    I noticed it too. It must be weight. I feel like my last car did the same thing. Just didn't feel as snappy or a:mads quick at overtaking other vehicles right after filling up at the station. But when the empty light comes on it feels a bit quicker.
     
  10. Aug 6, 2011 at 8:35 PM
    #10
    rcbs204

    rcbs204 Well-Known Member Vendor

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    Sounds like simple physics to me.
    Why the hell do you think drag cars only carry enough fuel to get a 1/4 mile?
    Answer = Because its heavy.
     
  11. Aug 6, 2011 at 8:41 PM
    #11
    rcbs204

    rcbs204 Well-Known Member Vendor

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    No dude, neither.
    Regardless of the full load in you truck as you say, just because you have less fuel in your truck does not magically give you more horse power. This is a placebo effect.
     
  12. Aug 6, 2011 at 9:04 PM
    #12
    packfan88

    packfan88 Very Nice !

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    while it doesnt give you more horsepower, it makes the horse power you have more efficient. its easier to move around 3840 vs 3940 (just a #).

    The 100lbs works out to be somewhere around 1hp. those guys in racing forums are always looking to shave weight by removing things like the passengers seats and carpeting. a general rule is if you can get 100lbs lighter you will gain around 1hp. some say it will gain .1 in a quarter but im not sold on that one.

    does that mean if he has 1hp more it will "seem" faster? prolly not. im leaning more towards a feeling of the truck's body roll and the lack of fluid moving thru the tank.
    with a full tank the truck may sway and slosh a little more. if youre running around with a six pack in the tank, its not going to wave back and forth inside the tank like some sort of wave ride at the theme park. i think that would give the "feeling" of beign lighter and quicker. a full tank would be a heavier and fuller feeling. think of a full stomach after a thanksgiving meal and a long day with out much to eat at all. you will feel lighter and it will seem easier to get your fat ass going. jmo
     
  13. Aug 6, 2011 at 9:07 PM
    #13
    whippersnapper02

    whippersnapper02 Well-Known Member

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    Lol. Everyone fill their tanks with foam so you can only fill up 1/4 tank at a time. Max performance 24/7.:burnrubber:
     
  14. Aug 6, 2011 at 9:38 PM
    #14
    rcbs204

    rcbs204 Well-Known Member Vendor

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    lol, I say we all just go for a 5 gallon gas tank, then we would be set!! :D
     
  15. Aug 6, 2011 at 9:41 PM
    #15
    whippersnapper02

    whippersnapper02 Well-Known Member

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    Just use a 20 coke bottle. Screw carrying more than a gallon around. Now let's go beat some Veyron ass!
     
  16. Aug 6, 2011 at 9:52 PM
    #16
    chris4x4

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

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    Pfff....Been doing this for a while now...'cept I filled my tank with golf balls. Coke bottles are hard to jam in the filler....
     
  17. Aug 6, 2011 at 9:55 PM
    #17
    chris4x4

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

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    OP, the only reason you may feel more performance would be because of the less weight. Gas (6.1#/gal.) would be about 95# at 1/4 tank......+/-.
     
  18. Aug 6, 2011 at 10:03 PM
    #18
    whippersnapper02

    whippersnapper02 Well-Known Member

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  19. Aug 6, 2011 at 10:04 PM
    #19
    VirginiaBound

    VirginiaBound Whyareyoureadingthis?

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