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Question about RPMs

Discussion in 'Technical Chat' started by Cloud, Jun 1, 2011.

  1. Jun 1, 2011 at 9:47 PM
    #1
    Cloud

    Cloud [OP] Member

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    Hey everyone, just got a 2011 4x4, v6, double cab, 6sp tacoma. I've never owned one before, but so far I love it. However, I noticed when I took it on the interstate, that in 6th gear at about 70-80mph the tach is at 3000rpms. That seems pretty high to me, is that normal?
     
  2. Jun 1, 2011 at 9:58 PM
    #2
    iliketurtles

    iliketurtles Well-Known Member

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    Have the same engine and transmission and noticed the same thing with the high rpms. How's your mileage?
     
  3. Jun 1, 2011 at 10:12 PM
    #3
    Cloud

    Cloud [OP] Member

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    Thanks. I dont suppose there is anything that can be done to fix that? (sorry I know I'm showing my ignorance on the subject)
     
  4. Jun 1, 2011 at 10:14 PM
    #4
    KenLyns

    KenLyns Lord of War

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    The 5 spd auto would be about 2500 rpm at the same speed, thanks to a taller top gear (0.72 vs 0.85 for the manual). EPA highway milage is worse for the 6-spd manual probably for this reason.
     
  5. Jun 1, 2011 at 10:14 PM
    #5
    Cloud

    Cloud [OP] Member

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    Not really sure of the actual mileage yet. I just filled up for the first time, got about 300 miles on a full tank.
     
  6. Jun 1, 2011 at 10:14 PM
    #6
    especk

    especk Nothin' Special

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    bigger tires will help
     
  7. Jun 1, 2011 at 10:19 PM
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    97yota4wd

    97yota4wd Well-Known Member

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    x2, kind of like the gearing on a dirtbike. make the back sprocket bigger, the top speed raises with the ammunt of rpms
     
  8. Jun 1, 2011 at 10:21 PM
    #8
    steve o 77

    steve o 77 braaap

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    larger back sprocket actually reduces the top speed and gears it down but we get the idea:p
     
  9. Jun 1, 2011 at 10:26 PM
    #9
    especk

    especk Nothin' Special

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    haha true
     
  10. Jun 2, 2011 at 5:54 AM
    #10
    KenLyns

    KenLyns Lord of War

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    It will take a significant jump in tire size to make up for the 18% difference in gearing between the manual and auto, like going from 31" to 37" tires. Bigger tires are heavier, so they'll offset milage gains. Going to a taller axle ratio, equivalent to a smaller wheel sprocket on a bike, has fewer drawbacks (minimal weight gain, no speedo error), but acceleration will suffer. The proper solution for Toyota is to go with a taller 6th gear or add a 7th gear.
     
  11. Jun 3, 2011 at 11:01 PM
    #11
    x2468

    x2468 Well-Known Member

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    seems pretty stupid that 6th gear on the manual is lower than 5th on the auto. Sounds almost like it's a close ratio tranny in the 6 speed manual? Thing must accelerate like a beast.... But for practicality they should have put 5th slightly lower than the auto 5th and then made 6th higher. I mean when i consider getting a manual tran car, the first advantage i think of is better MPG...
     
  12. Jun 3, 2011 at 11:03 PM
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    x2468

    x2468 Well-Known Member

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    could the OP fix things by changing out the rear axle gears? or would it mess up the gaps in the lower gears?
     
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