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Old 05-23-2002, 11:06 AM   #1
mhoward1
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Default Subaru's and Audi's CVT

With all of the hoopla around Audi's CVT, it made me wonder what ever happened to Subaru's. I know that they only had it on the Justy (I think) for a production car, but they had several Concept vehicles and a few test mules running them on higher output applications in 1985. I guess they were too far ahead of their time.
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Old 05-23-2002, 01:20 PM   #2
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Honda made one too.
2 problems:
1) people don't like them because the engine revs similar to a clutch slipping-it's weird.
2) designs to date have not been able to handle much torque. Audi claims they have improved this and have bolted their 3.0 V6 to it. Time will tell.
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Old 05-23-2002, 03:49 PM   #3
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iirc the justy one was actually made by suziki
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Old 05-23-2002, 03:53 PM   #4
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I remember thay had a protype built behind the Xt6 engine, but I can not remember the name of it. It was at the 1984 or 1985 Detroit and Tokyo show.
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Old 05-23-2002, 03:55 PM   #5
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Hmm... what exactly is a CVT?
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Old 05-23-2002, 03:59 PM   #6
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Continuiously variable transmision (SP?). It has no gears so the ratio for the engine can remain the same.
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Old 05-23-2002, 04:10 PM   #7
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O.k got it... Would this be similar to Mazda's Rotary Engine on the older RX7's? Interesting stuf..
-Ells
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Old 05-23-2002, 04:40 PM   #8
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Like a John Deere Lawn Tractor....
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Old 05-23-2002, 10:38 PM   #9
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Quote:
Originally posted by ejicon
O.k got it... Would this be similar to Mazda's Rotary Engine on the older RX7's? Interesting stuf..
-Ells
Not like the mazda rotary...Like a snowmobile belt drive. As the speed of the engine changes, the belt pulleys change, thus changing the transmission drive ratio. Just smooth acceleration and decel. Not thumping gears felt.

The new Saturn Vue 4cyl has its own cvt. Very few moving parts. You'll never feel a shift.
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Old 05-23-2002, 11:19 PM   #10
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the upcoming Nissan SUV Murano has CVT

Quote:
Murano comes with either front wheel drive or an optional AWD system. Power comes from the 3.5L VQ V6, with “240-plus” horsepower. But the most interesting feature will be Nissan’s continuously variable transmission (CVT). The transmission eliminates the “steps” between gears for a smoother, more efficient operation. The SE models also come with a seven-speed manual shift mode.
more info...

http://www.freshalloy.com/site/cars/...ano/home.shtml
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Old 05-24-2002, 01:09 AM   #11
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Default nissan's extoroidal CVT is kinda fun...

The Skyline GT-8 (current shape a la G35) has the 3.5ltr 6 + CVT is pretty nice - but in general I think the car sucks (only coz I am a longtime Skyline owner, and the new "Skyline" is in no way, manner or form a REAL Skyline).

The GT-8 has an 8 "speed" manual tranny style programme with paddle shifters, ending up in the wrong gear is surprisingly easy when you 8 to choose from, although you do get used to it - it ends up being a bit like GT3

The next GTR may even have one - because CVTs keep the engine in its sweetspot, by having it work like launch control they think they can make a faster car that eliminates much of the need for intrusive traction control systems (that will still be there for whoopsie moments though). Another rumour is that the front wheels will be powered by electric motors for instant response and weight savings.

Cheers
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Old 05-24-2002, 11:59 AM   #12
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I recall Subaru had a concept vehicle called the Subaru Sagres that had a CVT in it. I think it made an appearance in the 30th Tokyo Auto Show but not sure as it was a while ago. Don't much else about it though....

Ray
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Old 05-24-2002, 02:10 PM   #13
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Default Making the CVT

I work for a company that is working on the development of the the CVT belts/chains. There is no word from Subaru about needing/wanting one. We have an Audi A4 on site running CVT and it's pretty damn sweet. They are actually considering putting in fake shifts, because without the shifts people feel like there is something wrong with the car when they drive it. IDIOTS!
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Old 05-24-2002, 02:24 PM   #14
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Default Re: Making the CVT

Quote:
Originally posted by RUimprezed
I work for a company that is working on the development of the the CVT belts/chains. There is no word from Subaru about needing/wanting one. We have an Audi A4 on site running CVT and it's pretty damn sweet. They are actually considering putting in fake shifts, because without the shifts people feel like there is something wrong with the car when they drive it. IDIOTS!


I know what you mean. One of my roommates has a CVT A4. It's deceptive, in that if you're used to gauging speed by the engine note, you'll find yourself doing 65+ in a residential area.

Not only did some people seem to need fake shifts, but the regular automatic "creeping" forward when the brake is released is a trait that the CVT doesn't have ... except that Audi put it in because they were afraid people wouldn't like an auto tranny that didn't creep.
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Old 05-24-2002, 08:58 PM   #15
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Wow, I didn't know there were so many techno-knowledgable dudes here. You guys know your stuff.

The Saturn CVT was delayed due to imprecise machined parts from Hungary. Who would have thunk We just got our first 4 at our dealership this week. I've driven an experimental CVT Saturn in Tennessee, but it broke.
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Old 05-26-2002, 09:19 AM   #16
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Default Re: Re: Making the CVT

Quote:
Originally posted by Coati

Audi put it in because they were afraid people wouldn't like an auto tranny that didn't creep.
eek! the creeping tranny is one of the biggest reasons i don't like auto trannies!
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Old 05-26-2002, 01:48 PM   #17
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d00d!

that Nissan Murano is pretty nifty lookin! It's got that quirky futuristic style, and it looks ok. The front could use some work, but that rear end looks pretty nice.

the interior on the other hand looks waaaaaaay too blocky. I don't like the interior too much. But overall it looks like a nice performing vehicle.......a forrester like vehicle.

-SST
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Old 05-26-2002, 08:44 PM   #18
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Default Re: Re: Making the CVT

Quote:
Originally posted by Coati
Not only did some people seem to need fake shifts, but the regular automatic "creeping" forward when the brake is released is a trait that the CVT doesn't have ... except that Audi put it in because they were afraid people wouldn't like an auto tranny that didn't creep.
What they should do is put an "Off" button for that fake shift feel for the morons (Which is like 90% of the american population). Like that, the stupid people can have their cake, but the enthusiast doesn't have to eat it too.
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Old 05-28-2002, 01:01 PM   #19
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In Audi's case, the CVT transmission is belt driven. Just imagine the gears as the stretchable belt. When you need to switch gear, two wheels pull the belt and stretches the belt out and hence increasing the belt circumference, and increase gear size. A pretty clever idea.
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Old 05-28-2002, 01:58 PM   #20
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Default Re: Making the CVT

Quote:
Originally posted by RUimprezed
I work for a company that is working on the development of the the CVT belts/chains. There is no word from Subaru about needing/wanting one. We have an Audi A4 on site running CVT and it's pretty damn sweet. They are actually considering putting in fake shifts, because without the shifts people feel like there is something wrong with the car when they drive it. IDIOTS!
They already strangled the thing... the first models just let the engine go to the correct revs, and then stayed there, like a jet taking off on acceleration. Because consumers complained, they built in a gradual rev rise, at the expense of performance.

"Waahhhh! I want my awesome new technology to feel just like the crappy old technology! Change bad, me no likey!"

What you said... IDIOTS!

mbs
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Old 05-28-2002, 02:09 PM   #21
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It's amazing how many don't accept change.
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Old 05-28-2002, 03:42 PM   #22
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Quote:
Originally posted by jk147
In Audi's case, the CVT transmission is belt driven. Just imagine the gears as the stretchable belt. When you need to switch gear, two wheels pull the belt and stretches the belt out and hence increasing the belt circumference, and increase gear size. A pretty clever idea.
Actually, it's chain driven.... and there's no stretching... the chain slides around on 2 cone "gears"...
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Old 05-28-2002, 06:31 PM   #23
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This might have some more information:

http://www.insightcentral.net/encvt.html
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