CVT Transmisson

frontlinegeek · Feb 16, 2019

Jimmyson27 said:
What do you mean takes time to get use to it?

There is a major shock to the driving muscles and ears for almost everyone when first using a CVT. There are no shift points and the classic indication of relative speed based on how loud/fast your engine is, is no longer valid.

Comically, when I drive my wife's 5 spd auto CRV, it is now the one that is disorienting to a certain degree.

Jimmyson27 said:
What kind of maintenance?

I would assume just the fluid change in the transmission.

Gruber · Feb 16, 2019

frontlinegeek said:
Comically, when I drive my wife's 5 spd auto CRV, it is now the one that is disorienting to a certain degree.

Exactly same here. Driving the 5 speed CRV, which felt like a well fitting glove before, feels weird now with constantly revving the engine and unnecessary jolts.

Charley-TX · Feb 17, 2019

Gruber said:
Exactly same here. Now driving the 5 speed CRV, which felt like well fitting glove before, feels weird now with constantly revving engine and unnecessary jolts.

YES!, Same here. driving our Suburban up this short but steep hill, Engine revs, hard shift from 1-2 sometimes to 3, then come to a stop sign. It is a much more pleasant drive with the CVT civic.

vctwhitepearl · Feb 17, 2019

Jimmyson27 said:
Recently bought a civic sedan 2019 sport cvt transmission

Currently at 2,000 miles. Wanted to see how your car holding up so far with cvt transmission

I was one of the unlucky ones that had the CVT valve assembly noise on hot restart. Likely due to the car being a demo floor model and had little or no brake in @ first 100 miles.....Oh yes, the noise was there before 1.5T was boosted. After recording the noise and giving sound clip to Honda dealer for evaluation for warranty work, they got approval for CVT replacement. Supposedly this is or was a rare issue. I've got 50k on it now and it's running really strong. Currently with selectable 3 tune upload Ktuner Stg2 with up tweak boost mid range RPM & final boost @ 23.5 lbs. It has all the flying gold wing glory you could possibly want on a public road.

frontlinegeek · Feb 17, 2019

vctsonicgrey said:
I was one of the unlucky ones that had the CVT valve assembly noise on hot restart.

Sadly, there is always going to be something and someone has to get it. The thing for me was the rear dif in my Gen1 CRV started going bad at about 70,000 km but I just changed the fluid more frequently and ignored it as it rarely happened except in the winter on slippery roads.

Hopefully you get a long life out of this replacement CVT. I know that in the much longer term, the one thing that does go in almost all Hondas is the transmission unless it is a manual. We all like to poke at Scotty Kilmer but he is right in that there are issues in general with Honda transmissions. IF you want to see why, there is a really good teardown of an Accord transmission on the Weber Auto channel.

Honda automatics are really multi clutch manuals and have been for a long time. No planetary gear sets.

I am hoping he does a teardown on a Honda CVT sometime soon.

Gruber · Feb 17, 2019

frontlinegeek said:
Sadly, there is always going to be something and someone has to get it. The thing for me was the rear dif in my Gen1 CRV started going bad at about 70,000 km but I just changed the fluid more frequently and ignored it as it rarely happened except in the winter on slippery roads.

Hopefully you get a long life out of this replacement CVT. I know that in the much longer term, the one thing that does go in almost all Hondas is the transmission unless it is a manual. We all like to poke at Scotty Kilmer but he is right in that there are issues in general with Honda transmissions. IF you want to see why, there is a really good teardown of an Accord transmission on the Weber Auto channel.

Honda automatics are really multi clutch manuals and have been for a long time. No planetary gear sets.

I am hoping he does a teardown on a Honda CVT sometime soon.

After seeing how it works, no wonder it’s picky about the fluid. The fluid has to do so many different things.
Well, mechanical friction clutches don’t last forever and will need replacement eventually. Nothing wrong with that as long as the replacement is easy. Not so with transmissions. That’s why I won’t buy a double, triple or quintuple clutch transmission car. The less clutches the better.

frontlinegeek · Feb 18, 2019

Gruber said:
After seeing how it works, no wonder it’s picky about the fluid.

For sure. They are very impressive designs but they have so many points of failure that it all has to work really well or they just die.

One of the big changes on our CVTs that I was able to find (Compared to the previous Honda CVT design) is that they used to not have a torque converter and actually used a clutch pack and a torque damper. Ours and for a while now, have a torque converter instead. Weber guy has a torn down older style Honda CVT in the video collection too.

Charley-TX · Feb 18, 2019

Most if not all automatic transmissions have some type of clutch.
To the best of my knowledge, the conventional 4,5,6, speed autos with planetary gears have several clutch packs that hold onto other planetary gears or to the transmission housing and they move through the gears.
Our CVT should have some clutch at the torque converter to lock it once the car is on the move.
DSGs have two clutches, depending on the manufacturer some are dry some run in trans fluid (VW)

frontlinegeek · Feb 18, 2019

Charley-TX said:
Most if not all automatic transmissions have some type of clutch.

All transmissions have clutching. Planetary gearset transmissions use a combination of internal clutches and outer braking bands (Depending on who designed it)

The clutch for a torque converter is in the converter itself.

There is also a clutch in a CVT for reverse gear.

Gruber · Feb 18, 2019

frontlinegeek said:
All transmissions have clutching. Planetary gearset transmissions use a combination of internal clutches and outer braking bands (Depending on who designed it)

The clutch for a torque converter is in the converter itself.

There is also a clutch in a CVT for reverse gear.

Of course, but the point is, what is the load these clutches handle. The small clutches in a regular AT design basically deal with the inertia of freely spinning gears disconnected from the engine or the wheels. These big clutches in the Honda design take on the fulll power.

gtman · Feb 19, 2019

Here's a new CVT discussion that might prove interesting...

CVT Belt Failure at 14K Miles
https://www.civicx.com/threads/cvt-belt-failure-at-14k-miles.33596/

frontlinegeek · Feb 19, 2019

Gruber said:
These big clutches in the Honda design take on the fulll power.

Agreed. I would bet the lower quality friction material in those infamous Honda 5 speeds from the 2000s all had substandard friction material and also too little hydraulic pressure.

briq4 · Feb 19, 2019

Has anyone had their CVT feel like it's at the absolute tallest of ratios it can be at and upon light acceleration won't change ratio? I was coming off an off ramp maybe going 35 and when I was merging onto the next road it was like having a stick that you forgot to take out of 6th and tried to accelerate.

Gruber · Feb 19, 2019

briq4 said:
Has anyone had their CVT feel like it's at the absolute tallest of ratios it can be at and upon light acceleration won't change ratio? I was coming off an off ramp maybe going 35 and when I was merging onto the next road it was like having a stick that you forgot to take out of 6th and tried to accelerate.

It happened to me once, maybe twice sometime ago but not any more since last summer. It seemed like the car would not react to the pedal at all, even a strong push, no rpm increase and no go. Maybe for several seconds after coasting to lights that changed to green, at low speed.
I wanted to find out how to make it „snap out of it!” (the thing parents like to scream at their kids when losing points in school sports) but „I couldn’t reproduce the problem” as dealer service likes to say.

frontlinegeek · Feb 19, 2019

briq4 said:
Has anyone had their CVT feel like it's at the absolute tallest of ratios it can be at and upon light acceleration won't change ratio?

Yup. I have mentioned it elsewhere but here it is again. If you decelerate to just a slow enough speed and then glide and then accelerate, then for whatever reason, the car will not catch up to what is going on and there is a massive lag before getting down to an appropriate ratio. I have had it happen about a half dozen times but most reliably at the top of my street as I tend to not really stop at the stop and then go out if it is clear in both directions. I give it gas and NOTHING. SUPER annoying but not at all even remotely frequent enough to be a problem or a danger. 5 or 6 instances in over 25,000 kms that is mostly city driving is pretty tame.

CVT Transmisson

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