It is as unreliable as the manufacturer makes it. CVT has been used in agricultural machines for decades without much issue. Rubber belt cvt is the best though because of simplicity.

>>29086218
It's very reliable.

For the first 50k km

to be fair you kinda gotta give them credit for pulling the feat of making that shit last a couple 10k miles when you consider how that thing works.

>>29086241
I guess the call of the delicious monies saved is just too sweet to not try the most retarded things and keep throwing the shit on the wall until it finally sticks after decades.

>>29086218
They're just okay now. After a decade of kinda shit ones making a bad name for CVTs, they've finally made them robust enough to "last" about 150k miles. However theres no actual tangible benefits to them as they originally claimed such as improved MPGs because the engine is in the optimal RPM for either power or effeciency. However with modern day 6, 8, 9, 12 speed automatic transmissions being so good, they're now better than any theoretical CVT advantages.

They're just fine in lighter vehicles like SxS or utility vehicles because they're simply lighter and who gives a shit? JATCO was making cheap shit for Nissans because Nissan wanted a cheap transmission which often failed at like 60k miles and were fully sealed and non-servicable. Even under warranty, they'd simply junk the bad one and install a brand new one. There are no refurbished ones, you can't even change the fluid. This is why CVT's got such a bad rap, but even Honda had several bad batches of them.

It should be noted, an "eCVT" is NOT a CVT transmission at all, and is mostly different, but shares a stupid abbreviation. eCVT's are God's gift to econobox automatics. Actually robust, actually constant velocity, actually good in every way. Cheaper than a 12 speed automatic, but still gives all the claimed benefits of a CVT.

>>29086227
>CVT has been used in agricultural machines for decades without much issue
yeah but those are hydraulic rather than belt drive https://youtu.be/dgtIKMAjvFI

>>29086218
Its a wear item that costs thousands of dollars to replace when it inevitably wears out

>>29086264
Why can't cars use something similar?

>>29086290
fucking heavy

>>29086290
Extreme Weight and Bulk: Hydraulic systems require heavy casings, fluid reservoirs, pumps, and hoses, making them too heavy and bulky for compact or lightweight consumer cars.

Strict Maintenance Needs: The system depends entirely on clean hydraulic fluid. Even minor dirt contamination can destroy internal components, requiring frequent fluid and filter changes.

Risk of Fluid Leaks: Because the system operates under incredibly high pressure, it is prone to fluid leaks over time, which can lead to sudden performance drops or environmental hazards.

Noisy Operation: Hydraulic pumps and motors produce a distinct high-pitched whining noise under heavy loads, which reduces passenger comfort.

by ai slop

>>29086290
Because it's fucking dogshit.
You're performing chemical energy to thermal energy to produce linear power to convert it to rotational power so you can convert it to hydraulic power, then back to rotational power.
Each step along the way you're losing efficiency so whatever gains you make ensuring your motor stays at a high BSFC you're losing in heat to conversion losses.

The only reason ag and heavy equipment use hydrosts is because it's retard-proof. You can't break a driveshaft or grind gears since an overpressure scenario will get released by a safety valve and drained back to the tank which is important when you have room-temperature IQ maga-hat donning blue collar patriot or some brownoid behind the controls.

>>29086314
That makes a lot of sense. Have a nice day.

>>29086272
Ah but enough about tires

>>29086314
Then why isn't it standard on every bmw in Europe then?

They should make it as easy to change as a timing belt then it would be a good idea.

>>29086264
No, there are ( and have been ) vario-belt CVT's in ag use for quite some time.
They are still very common in utility vehicles like Gators and XUV's, and saw some use in the drives of combine harvesters.
(T. John Deere tech)

File: 500k mile prius.jpg (80 KB, 960x960)

80 KB JPG

>>29086218
>How unreliable is CVT actually?
It's plenty reliable. How good are the manufacturers at making them, however?
1st gen non-S MINI Cooper automatics are well known for CVT failures, for instance. Any Jatco CVT-equipped Nissan is well known for CVT failures.
On the other hand, there's plenty of 20 year old Prius models out there with 250k-500k+, all with the original transmission and no issues. The newer Toyota models that have one "real gear" and then the CVT "gear" (most Corollas etc) all seem to be pretty reliable too, I haven't really heard about any widespread failures in any of those.
They're also mind-numbingly soulless to drive. Makes some sense in a hybrid, but nothing's more pathetic than doing a pull and watching the RPM sit perfectly still near redline. It's likely why many newer ones have "manual" shifting modes with fake gears, so you can feel and sound like you're actually doing something.

>>29086314
>The only reason ag and heavy equipment use hydrosts is because it's retard-proof. You can't break a driveshaft or grind gears

>Challenge Accepted.

Yes. You can. Spent (and spend) a lot of time replacing various components of MFWD drivelines because some lump in a seat decided that pressing the forward pedal to the floor was the best course of action when the machine was not doing what they wanted it to.
A hydrostat trans will absolutely make shit go bang in a very expensive manner.

>>29086227
fpbp. it's not a fundamentally bad idea but a lot of existing examples are made very cheaply

>>29086245
>an "eCVT" is NOT a CVT transmission at all
Can you explain that in lame ants terms?

>>29086899
what he meant is ecvt is just a marketing term because toyota hybrid drive does not actually have gear ratios like a normal transmissions
all driveline components of toyota hybrids are permanently locked together with no clutches, fluid couplings or anything like that and their gear ratios are static, but because it's a clever combination of an open differential and an epicyclic gears where the computer is free to dictate how the combustion motor and two of the electric motors spin (and in what direction) the speed of the final drive can be varied.

>>29086862
>ask car to give you best possible power
>car gives you best possible power
Soul is when your car fails to obey.

>>29086899
No because most transmissions are black magic to me. Best I can tell is it's a planetary gear setup that is more robust than a CVT and automatic transmission. Basically they're bomb proof outside of harsh abuse and should outlast any engine. It's also quite smooth when paired with a hybrid powerplant. Toyota and Ford use these eCVTs that regularly make it to 300k miles before the car is junked because of the engine failing.

CVTS are trash by design because you cannot service them like manuals

>>29086899
instead of a steel belt that slips and wears out from all the stress of going from 0-25mph, the ecvt basically starts in 3rd gear and the electric motors can push it anyways with their fuckhuge torque until it reaches 3rd gear speeds and then a planetary gearset can adjust anywhere from 3rd to 6th gear equivalent of a manual transmission for highway speeds

>>29087106
In a Toyota ecvt you don't even really 'feel' the engine. In my Maverick the engine "idles" at the ideal 2500rpm and the first 30-40% of the pedal causes acceleration without the engine changing rpm. Basically the ideal way to drive the vehicle is to never go above 40% "power" on the meter so the engine never goes above 3k RPM and stays in the efficiency zone. 40% power actually quite a lot when dding too.

I want a manually operated CVT. Like the vario-control is like a big boat throttle. Why? I don't know. It sounds fun.

>>29087119
It already is manual as can be in the sense ecvt is just "0-100%" depending how far you press the gas pedal. If you floor it, it just immediately outputs as much power and rushes the engine to max rpm (like 5600 on atkinson engines), the engine is even spun up by the electric motors and not a starter so it hits max RPM within a second and doesn't do the natural RPM progression. This is how it is in the maverick anyway, I think toyota hybrids are normally tuned to gradually ramp up the RPM to not "shock" people and drive more like a normal car, hence the slower 0-60s in their hybrids.

>>29086290
they do. the classic slush box is the evolution of the turbo power shift transmission, the predecessor of power split cvt's. Since cars are ok with having some rpm fluctuations more is not needed.
>>29086314
In dozens of dlg tests, power split transmissions trade blows with newest 24 power shift gearaboxed, you are just spewing nonsense. A power split like Vario™ or Smatic transfers almost its enitre power through simple gears

>>29087119
only boomers use that mode. modern cvts operate like one-pedal-drive evs
>It sounds fun
its literal aids to operate

File: Epicyclic_Gearing_Station(...).gif (2.66 MB, 500x500)

2.66 MB GIF

>>29086899
CVT is a term for any concept that'll yield a continuously variable transmission, but people usually mean a belt-drive one, which is mechanically entirely different from the eCVT.
The belt-drive one works a bit like the shifting on your bicycle. You vary the size the of one of the cogs so that one rotation of the crank spins the chain further (or less far). Except here that's a belt or chain being squished between cones. Changing the distance between the cones determines how far outwards the belt/ chain goes and thus your drive ratio. The contact area here is prone to wear, badly sized or worn units may slip, which will swiftly spell their end. Also friction will eat most of your savings with these.

The eCVT uses a planetary gear-set (see pic). This gear-set has three shafts. One of these goes to the wheels (well, the diff really, with a big electric motor attached), one goes to the engine, and the third goes to a smaller electric motor / generator that can be set to run in either direction, at a wide range of speeeds an torque. With one output being tied to wheelspeed, the little electric machine determines how fast the engine gets to spin. Any electricity it generates will be sent either to the batter or the bigger motor (or the other way round). There's no room for slippage here, all parts are permanently meshing. So with gear-teeth and electric motors being potentially very durable components this will work a long time if there's enough oil in it.

>>29087781
>size the of one of the cogs
sprocket, cogs are the teeth of gears and sprockets

>>29086858
>the drives of combine harvesters
no... they are used in the thresher though.

>>29086858
Oh yeah, deere's electric cvt is a generator instead of a pump right?

>>29086899
"no REAL Scotsman"

>>29086218
toyta cvts will outlast the rest of the vehicle. they are 100% gear driven.

>>29086264
Hydrostat transmissions are BASED.
Mainly because Mexicans can't break them.
.t family owns a lot of dairy farms.

>>29087821
>Hydrostat transmissions are BASED
Sure if you aren't using draft implements.

>>29087808
hes talking about old shit