8, 9, 10 speed automatics.....

Discussion in 'General Automotive Discussion' started by Driver72, Aug 21, 2015.

  1. Driver72

    Driver72 Gold Member

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    Seems like with power ratings, there is a race to have the "most gears" in an automatic gearbox.

    Has it become silly?
    8 speed autos to me seem like the pinnacle.

    I mean really at what point does having more gears work against you.
    The 9 speed auto in Chrysler's cars seem pointless. In one report I read, you can't even get the car to go into 9th gear unless you are going like 80+ mph and the ground practically has to be going downhill, as any little grade and it's gearing is so tall it can't keep the car going 80 mph.

    Now 10 speeds are coming.

    Help me understand:
    If you have a 6th gear that's 1:1
    7th gear is like .85 to 1
    8th gear is like .70 to 1

    What's left? Anything taller and it can't move the car/truck along at freeway speeds.
    More gears before the 1 to 1 gear?

    Well again, at some point the additional shifts and complexity of it has to work against acceleration right?
    Do you really want or need 7-8 gears before you even get to an overdrive gear?
    In some smaller displacement engines now it requires 3rd gear just to get to 60 mph. With a 10 speed it would probably require 4th gear....to get to 60.
    1/4 mile runs will finish in what 6th or even 7th gear???

    Am I the only one who doesn't seem to understand the need or desire to go above 8 speed autos.
    Granted I'll admit when we had 5 speed autos, I often wished for an additional highway gear, especially on 4 bangers where at 70 mph cruising you'd be at 3500 rpms. But when 7 and 8 speed autos started showing up a few years ago, I felt, that's perfect.
    Now 9 and 10 speeds, have the quest for more gears gone too far?
     
  2. B5 Blue

    B5 Blue Platinum Member

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    POS 4 banger can have lower final drive to move out of it's way
     
  3. Dak59RT

    Dak59RT Gold Member

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    If it keeps going then everything will probably go to CVT. More speeds means more time spent at higher rpms near red line. That seems like the most logical progression, doesn't it? Now that would be a fast ride while taking away a lot of the driving experience!
     
  4. B5 Blue

    B5 Blue Platinum Member

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    CVT can't handle lots of torque
     
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  5. rw99

    rw99 Silver Member

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    To me, for a big torque performance car, 5-6 gears is enough. Run a mid-3 rear end and put 1:1 at fourth gear.

    I find my A8 to be a bit weird: 6th is the new 4th. And 3rd is kinda the new 2nd...

    Caveat: it's only weird if you're shifting it yourself. Stick it in Sport or Track and it's pretty good.


    Rich
     
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  6. fnkychkn

    fnkychkn swollen member Gold Supporting Member

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    it's not all about speed and acceleration. pretty sure it's driven by fuel economy and emissions.
     
  7. huggytree

    huggytree Gold Member

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    give it 20 years.....10hp a20 egg that drives itself......and gets 200 mpg

    in 20 years see what happens and remember where you heard it first
     
  8. Dak59RT

    Dak59RT Gold Member

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    Couldn't that change after SRT R&D further develops the technology? It wasn't that long ago that automatic transmissions in general were second best to manual transmissions. Now they're banging away shifts faster than we can blink. ;)
     
  9. CubeMan

    CubeMan Tri-State Overlord

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    7-8th-9th gear are for emission purposes to make the mpg crazy high, Corvettes 7th gear is so tall but reduced the emissions so much.
     

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