HAH...philipa_240sx wrote:
kerrton wrote:Robteesit, excellent point, you are exactly right that is the point of this discussion and you bring up a good issue, even though I was defending the specific vibration issue, I feel the CVT could use some improvements. The thing I specifically dislike is the surge or shock feeling on occaision when the torque converte engages or disengages. At just the right RPM when gently accelerating or gently decelerating this effect will really "kick" and "surge" almost like shift shock in a conventional tranny. It only does this when driving with a very light touch. I really hate this feature and to me it feels like it's "not right" and that it could be causing excessive wear and tear. As a result, I drive a little more agressively and less fuel efficiently to avoid this surge or jolt. So yes, I agree the CVT could be improved and if it didn't offer better fuel efficiency I would see no advantage to it over a convetional or even a 6 speed manul.
So if I or anybody else on here made you feel like you were being attacked for sharing your viewpoint and contributing to the discussion, I apologize. This forum is about discussing issues, problems as well as positive things about the Rogue and none of this should be taken personally. Keep posting please!
Jatco (who makes the CVT) designed it with a torque converter for exactly that reason. However, unlike a conventional auto, the torque converter 'locks up' at a very low speed (<20mph) to improve fuel economy. Regular autos lock up as well, but at much higher speeds. The torque converter also provides smooth acceleration from a standstill.CoupeVQ35CVT wrote: I didn't at first think or realize the CVT still utilized a torque converter like an auto (but it makes sense as it has to disengage the engine at some point when you stop!).
To philipa_240sx (and others in the know):Does this "shock or kick" feeling only involve the AWD models?kerrton wrote: The thing I specifically dislike is the surge or shock feeling on occasion when the torque converter engages or disengages. At just the right RPM when gently accelerating or gently decelerating this effect will really "kick" and "surge" almost like shift shock in a conventional tranny.
I agree with this. I have never felt any kind of vibration from my Rogue, it is smooth as silk with 3800 miles on it. It does lug the engine a little between 30-40 mph but that's why it averages 26mpg for me, the engine rpms stay low. I can see someone who likes easy acceleration getting frustrated with that part of it, but how did they not notice it on the test drive?Elton Noway wrote:
To philipa_240sx (and others in the know):Does this "shock or kick" feeling only involve the AWD models?
I have a SL with FWD and drive an equal mix of "easy gentle Sunday afternoon drives" as well as flooring it off a traffic lights to get ahead of slow moving trucks... as well as the aggressive, "Get the heck out of my way I'm late for work", kind of driving as I push the Rogue to its limits. I can honestly say I've never felt a vibration or felt my CVT shift like a conventional transmission... let alone a "shock or kick".
In adjusting to the Rogue (my fist experience with a CVT) the only sensation I could describe is something similar to a slipping clutch in a manual transmission. (i.e. when the RPMS climb the roof but there is no discernable evidence of acceleration, but rather a gradual increase in speed over several seconds until the vehicle reaches the desired speed.)
If my Rogue was kicking, shocking and vibrating... I'd be a little concerned.
Hey thanks for the explanation. I was aware of the inherent theoretical advantage in mpg, but totally forgot about the TC issue. Also didn't know about the TC lock up @ 20 mph or so, I was under the impression it was more like a regular auto in that sense.philipa_240sx wrote:
Jatco (who makes the CVT) designed it with a torque converter for exactly that reason. However, unlike a conventional auto, the torque converter 'locks up' at a very low speed (<20mph) to improve fuel economy. Regular autos lock up as well, but at much higher speeds. The torque converter also provides smooth acceleration from a standstill.
As for fuel efficiency, Nissan/Jatco claims the CVT actually has better fuel economy than even a manual transmission. There are fewer moving parts, the oil pump for the hydraulics takes next to no power, and the overdrive gearing is much higher than most manuals.
Honestly, Jatco has probably the most advanced CVT's in the world having sold more than 1 million worldwide. When the Rogue first came out, many car reviewers commented on how well tuned and programmed the CVT was. It felt a lot more like a regular transmission. The competition wasn't even close.
A good friend of mine had a Mini Cooper (the new one) with the CVT. Don't ask how many times they brought that car in for reprogramming. Every few months BMW would release another software update to fix driveability issues. In the end BMW gave up and put a regular auto in the Mini.
Someone on my grocery parking told me that. They will get a VCT reprogramming update!!!harryg wrote:anyone got any info as to whether the Canadian dealers have got this CVT reprogramming update??
got an appointment to get the other recalls looked at next week
After reading it, I don't think anyone except RogueGuy45 was bashing anyone else. That is, unless you consider people not agreeing with you to be "bashing". I think it's just a matter of perspective. CVT issues have definitely not been the same all across every Rogue produced. Some people have gone through several replacements. Other haven't even had a replacement CVT. For some the lugging/shuddering is an issue. For others its not so much.Robteesit wrote:Wow - I just re-read this post and did I ever get bashed here... maybe I didn't clearly express my concerns earlier.