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#3425429 - 07/15/14 11:42 AM CVT with shift sensation
wing0 Offline


Registered: 10/08/12
Posts: 232
Loc: Ontario, Canada
http://www.autoblog.com/2014/07/15/nissan-alters-all-cvt-act-less-like-stretched-rubberband/

Many new CVT out there have the shift sensation or shift logic built in to mimic automatics.

I am just wondering, would this generate more wear and tear on the CVT in the long run?

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#3425440 - 07/15/14 11:54 AM Re: CVT with shift sensation [Re: wing0]
sasilverbullet Offline


Registered: 08/22/04
Posts: 1248
Loc: San Antonio, Texas
Don't know, but my brand new 2014 Civic seems to have shift points.
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#3425452 - 07/15/14 12:10 PM Re: CVT with shift sensation [Re: wing0]
4wheeldog Offline


Registered: 04/23/12
Posts: 1454
Loc: East Mountains, NM
If the ECU is smart enough to vary the ratio shift points, it should not cause any odd wear. If it always shifts at the same ratio, I am thinking it will eventually "Notch" the cone.

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#3425465 - 07/15/14 12:22 PM Re: CVT with shift sensation [Re: wing0]
Miller88 Offline


Registered: 04/09/08
Posts: 12039
Loc: Onondaga County
I can understand the concept of a CVT.

But doesn't programming in gear ratios kind of defeat the purpose?
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#3425477 - 07/15/14 12:31 PM Re: CVT with shift sensation [Re: Miller88]
4wheeldog Offline


Registered: 04/23/12
Posts: 1454
Loc: East Mountains, NM
Originally Posted By: Miller88
I can understand the concept of a CVT.

But doesn't programming in gear ratios kind of defeat the purpose?


People are used to the feeling of torque from flywheel effect when the transmission shifts, so CVTs make it feel like there is less torque, and the "Rubber band effect" is the lack of that kick in the butt. It is a matter of perception, not an actual performance issue.

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#3425501 - 07/15/14 01:11 PM Re: CVT with shift sensation [Re: 4wheeldog]
leeharvey418 Offline


Registered: 08/05/11
Posts: 734
Loc: Southeast Michigan
Sooo....

Doesn't that kind of defeat the purpose of a CVT? crazy
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#3425507 - 07/15/14 01:16 PM Re: CVT with shift sensation [Re: wing0]
901Memphis Offline


Registered: 08/14/10
Posts: 12517
Loc: Northern Kentucky
We don't need CVTs. 9 speed automatics can handle everything.
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#3425508 - 07/15/14 01:19 PM Re: CVT with shift sensation [Re: leeharvey418]
d00df00d Offline


Registered: 10/20/05
Posts: 10659
Loc: PA
Originally Posted By: leeharvey418
Sooo....

Doesn't that kind of defeat the purpose of a CVT? crazy

Yes. Completely.

Discrete ratio programming on a CVT is one of the most blindingly stupid features I can think of. It blows my mind that people actually want it.
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#3425511 - 07/15/14 01:29 PM Re: CVT with shift sensation [Re: d00df00d]
JHZR2 Offline



Registered: 12/14/02
Posts: 39885
Loc: New Jersey
Originally Posted By: d00df00d
Originally Posted By: leeharvey418
Sooo....

Doesn't that kind of defeat the purpose of a CVT? crazy

Yes. Completely.

Discrete ratio programming on a CVT is one of the most blindingly stupid features I can think of. It blows my mind that people actually want it.


+1

Just plain stupid. For all the comments in the MT threads from the pro-AT folks, then technology moves on and we get this idiocy.

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#3425512 - 07/15/14 01:30 PM Re: CVT with shift sensation [Re: wing0]
badtlc Offline


Registered: 06/08/06
Posts: 5071
Loc: KC
shifting CVTs are have more of a slushbox feel than a torque converter based ATX. They are just terrible all around.
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#3425519 - 07/15/14 01:41 PM Re: CVT with shift sensation [Re: badtlc]
d00df00d Offline


Registered: 10/20/05
Posts: 10659
Loc: PA
When you buy an automatic transmission and demand shift shock, you're saying you don't want to be involved in gear selection, but you do want to be jolted every time it happens.

Think about what that means for a second. All the unsettling feedback, none of the control. It's tantamount to buying a machine the sole purpose of which is to poke you with a stick at random intervals while you're blindfolded.
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#3425532 - 07/15/14 02:03 PM Re: CVT with shift sensation [Re: wing0]
IndyIan Offline


Registered: 09/23/08
Posts: 8087
Loc: Ontario, Canada
Maybe they could do the BMW trick of aural engine enhancement, and use the sound system to simulate distinct ratios?
I wonder as well, if there is some wear reduction on some part of the CVT by having many small steps in ratio change vs. a truly continous ratio change?
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#3425534 - 07/15/14 02:07 PM Re: CVT with shift sensation [Re: wing0]
gregk24 Offline


Registered: 04/13/13
Posts: 5231
Loc: FL, USA
I think it's a neat feature to have for those who like the feeling of shift points. I really could care less either way, as long as it's reliable then that's all that matters, CVTs are not performance transmissions to begin with.
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#3425538 - 07/15/14 02:11 PM Re: CVT with shift sensation [Re: wing0]
Hokiefyd Offline


Registered: 06/24/04
Posts: 14505
Loc: Top of Virginia
Presuming that CVT reliability is good, and that they are perhaps lighter with fewer moving parts, etc, I think it's a great feature for those who want the sensation of gear changes. I like to feel the engine rev up through a gear, make a change, and then rev up again. It's part of how I'm programmed I guess.

But I don't feel the need to make those gear changes myself. My wife can't drive one anyway, and has no desire to, so why not give consumers like me a choice in how a CVT drives and feels? The great thing is it's ALL orchestrated with computer programming. You can have it feel like a CVT if you want to. I can have it feel like a traditional automatic if I want to. No change in parts.

More choice, more flexibility, more options...these are always good in my opinion.

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#3425548 - 07/15/14 02:20 PM Re: CVT with shift sensation [Re: 4wheeldog]
gregk24 Offline


Registered: 04/13/13
Posts: 5231
Loc: FL, USA
Originally Posted By: 4wheeldog
Originally Posted By: Miller88
I can understand the concept of a CVT.

But doesn't programming in gear ratios kind of defeat the purpose?


People are used to the feeling of torque from flywheel effect when the transmission shifts, so CVTs make it feel like there is less torque, and the "Rubber band effect" is the lack of that kick in the butt. It is a matter of perception, not an actual performance issue.


What is the flywheel effect?
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