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#1
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How Many Is Too Many?
Lexus and Hyundai currently have 8. Dodge will soon have 9. Now
seems Hyundai is upping the ante and developing a 10-speed automatic transmission. Good god, where does this end? Soon cars will be sporting enough gears to make a trucker blush. Patrick |
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#2
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How Many Is Too Many?
" > wrote in message ... > Lexus and Hyundai currently have 8. Dodge will soon have 9. Now > seems Hyundai is upping the ante and developing a 10-speed automatic > transmission. Good god, where does this end? Soon cars will be > sporting enough gears to make a trucker blush. > > Patrick > three is enough .....hate a lot of auto gears |
#3
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How Many Is Too Many?
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#4
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How Many Is Too Many?
On Jan 21, 12:11*pm, Dickr > wrote:
> On 1/20/2012 7:47 AM, wrote:> Lexus and Hyundai currently have 8. *Dodge will soon have 9. *Now > > seems Hyundai is upping the ante and developing a 10-speed automatic > > transmission. *Good god, where does this end? *Soon cars will be > > sporting enough gears to make a trucker blush. > > > Patrick > > A friend of mine had a 1957 Chev with a 283 V8, loud dual exhaust and a > Turboglide > transmission. Very different steady tune from the exhaust while the car > increased > in speed but the engine RPM didn't change that much. > Because of its unique operating characteristics, Turboglide did not > require large changes > in engine RPM even with very large differences in car speed or desired > engine output. In fact, > accelerating from rest, the engine speed would remain nearly > constant(with no movement of > the accelerator), even as the vehicle accelerated. Dick, Are you speaking of GM's old 2-speed Powerglide? I had one of those 2-speeds in a 60's Impala I used to own. Patrick |
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How Many Is Too Many?
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#7
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How Many Is Too Many?
On Fri, 20 Jan 2012 05:47:04 -0800 (PST), "
> wrote: >Lexus and Hyundai currently have 8. Dodge will soon have 9. Now >seems Hyundai is upping the ante and developing a 10-speed automatic >transmission. Good god, where does this end? Soon cars will be >sporting enough gears to make a trucker blush. > >Patrick I suspect a lot of it is marketing. Once you add a third planetary gear set you have all sorts of possible ratios. Now that most transmissions are controlled electronically rather then by simple hydraulic valves, it's almost trivial to add another "gear". I read some years back that in many of these transmissions they often "skipped" one or more of the possible ratios depending on how hard you were accelerating since most of the time you don't need all of them to move things along. It would be interesting to talk to a car makers autobox engineer about this. |
#8
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How Many Is Too Many?
On Jan 24, 2:33*pm, Ashton Crusher > wrote:
> On Fri, 20 Jan 2012 05:47:04 -0800 (PST), " > > > wrote: > >Lexus and Hyundai currently have 8. *Dodge will soon have 9. *Now > >seems Hyundai is upping the ante and developing a 10-speed automatic > >transmission. *Good god, where does this end? *Soon cars will be > >sporting enough gears to make a trucker blush. > I suspect a lot of it is marketing. *Once you add a third planetary > gear set you have all sorts of possible ratios. *Now that most > transmissions are controlled electronically rather then by simple > hydraulic valves, it's almost trivial to add another "gear". *I read > some years back that in many of these transmissions they often > "skipped" one or more of the possible ratios depending on how hard you > were accelerating since most of the time you don't need all of them to > move things along. *It would be interesting to talk to a car makers > autobox engineer about this. I'm sure skipping would have to happen quite often. If you're putting your foot in it, you're not concerned about economy, you want acceleration, so it would make little sense to hit all the gears. But if you're cruising, the trans should then act to keep the engine in it's sweet spot for best MPG. Or so it seems. Patrick |
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