Next F30 "335i" to have CVT Transmission?! - Bimmerfest - BMW Forums



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  #1  
Old 08-18-2011, 01:21 AM
BrooklynNY1015 BrooklynNY1015 is offline
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Next F30 "335i" to have CVT Transmission?!

I was on e90 post the other day and someone said they read "reliable" sources claiming the F30 3 series of BMW's would have CVT. Now to cars with full torque and Horse Power at high RPMs, this would make sense, but to a car like the 335i where 300lb/ft of torque is achieved at a LOW 1400rpms. Wouldn't this be useless and ruin the BMW experience?!

Maxima CVT Transmission

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  #2  
Old 08-18-2011, 04:01 AM
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Not really. CVTs have a hypothetical infinite gearing so you can design a CVT to maximize performace or maximize fuel efficiency.
Most CVTs are designed for the latter.
And lets not forget there are many 3-series with smaller engines.
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Old 09-06-2011, 10:08 PM
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I don't know why someone would like to drive that bloated Maxima. Is launching a car the only thing people know about driving?
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Old 09-07-2011, 02:48 PM
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It's infinitely more likely that the F3X will have BMW's new eight speed automatic.
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Old 09-08-2011, 05:50 PM
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Since my car is being repared my rental is a 2011 Altima 4 cylinder auto with a CVT transmission. This car drones while increasing speed and is very loud. Weird feeling since you feel no shifting.
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Old 09-12-2011, 07:04 PM
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Please no CTV! BMW had issues with these in the early MINIs and all you heard is Nissan's with CVT's failing!

Are they really that great?
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Old 09-12-2011, 08:39 PM
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If there's a hybrid version it'll presumably use the GM/BMW CVT. I think it's very likely the 335i will come with the 8-speed ZF. Unless they call the 340i.
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Old 09-14-2011, 06:38 AM
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I hope not, I have never heard anything good about CVT. N4S
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Old 09-14-2011, 06:40 AM
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silly question
what is CVT?
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Old 09-14-2011, 07:13 AM
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Quote:
Originally Posted by dalekressin View Post
silly question
what is CVT?
Wikipedia to the rescue; http://en.wikipedia.org/wiki/Continu...e_transmission

In summary; it's a transmission in which instead of gears there are belts and cones which allow a theoretically limitless number of gears up to a predefined maximum range. They are more efficient than a traditional automatic because there is no shifting delay, and basically the engine is allowed to rev to its optimum power band and is held there while the transmission itself takes care of the acceleration. Pretty cool tech, but still pretty new. It's also a really weird experience to accelerate without the traditional changing of the gears.

Until recently they really couldn't take high horsepower engines without detonating, so they were limited to low-powered econoboxes. Now with the push for greater efficiency a lot of money has been thrown at CVT development in the last few years which has resulted in high power applications. These will probably eventually replace the traditional automatic in normal applications, while the DCT will probably replace them in performance applications. Just my opinion though
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Old 09-15-2011, 06:57 AM
Michael Schott Michael Schott is offline
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It makes little sense for a performance car to have a CVT. These are used to maximize fuel economy and who buys a 335i for this?
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Old 09-15-2011, 07:02 AM
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CVTs improve economy but in sport mode they'll keep the RPMs at max output as the speed rises. It's not exactly sporty feeling or sounding but it's more efficient.

I certainly hope they don't use one though; 8 speeds is stupid, but a CVT is stupider.
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Old 09-16-2011, 08:36 AM
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Hmm thanks for your view of CVT
In my world it's a certified veterinary technician :-)
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Old 09-17-2011, 02:10 PM
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Originally Posted by dtc100 View Post
I don't know why someone would like to drive that bloated Maxima. Is launching a car the only thing people know about driving?
Maxima is a very nice car, and there is a reason people buy them. It is spacious, comfortable and quiet, powerful, stylish in its own right, and practical.
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Old 09-18-2011, 11:26 PM
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Originally Posted by bmw_n00b13 View Post
CVTs improve economy but in sport mode they'll keep the RPMs at max output as the speed rises. It's not exactly sporty feeling or sounding but it's more efficient.

I certainly hope they don't use one though; 8 speeds is stupid, but a CVT is stupider.
I can't believe that BMW would bring CVT to their cars, unless they have worked the software in a way as to give it a sportier feel and experience than every other CVT I have tried. Also is CVT not torque sensitive in that it can't cope with too much?
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Old 09-19-2011, 07:24 AM
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I can't believe that BMW would bring CVT to their cars, unless they have worked the software in a way as to give it a sportier feel and experience than every other CVT I have tried. Also is CVT not torque sensitive in that it can't cope with too much?
That certainly used to be true. Early CVT's were limited by the fact that they used rubber belts and thus were limited in the amount of torque they could manage. Development stalled for a while because of lack of demand, but the push for greater efficiency pushed more engineering into CVT's in the last few years. As a result, modern CVT's use chains mostly. Check the article I posted above; it has a great diagram of a modern CVT.

Now, there's still a practical limit on the amount of torque you can put through a CVT but most production cars fall way short of that limit. You'd have to go to the limited production vehicles (or production diesels) to find an engine that will tend to detonate a CVT.

Much as I sometimes dislike it (I've driven one CVT in my entire life and really disliked the way it felt) the CVT really is the best way to get optimum performance or optimum efficiency literally at the push of a button.

And yes, with software a CVT can emulate at least an automatic in terms of its "shifts" (at the expense of either efficiency or performance), but really why would you? We will probably have to get used to CVTs as a future transmission choice from most car manufacturers.

Oh, and I should also mention it's far easier to add a secondary electric powertrain to a CVT. Manuals and automatics are really designed as single-input systems and adding secondary inputs becomes complicated. A CVT you can add a third set of "cones" and have a truly hybrid powertrain that uses the optimum parts of the power band from multiple input sources. Quite cool in concept actually.
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Old 09-19-2011, 07:43 AM
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Old 09-22-2011, 03:18 PM
BrooklynNY1015 BrooklynNY1015 is offline
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Why would BMW go with the 8 Speed Transmission. That is a HUGE advantage the M3 has over the IS-F. Top Gear described the 8 Speed Auto housing the power as almost an illusion of power, and i quote, almost like having cookies at a high shelf you can't reach, its almost as if you can never reach it so you basically don't even have it [cookies = high power]

Unless BMW is able to master the 8 speed, unlike Lexus... this could be a major upset for the F3X ...
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