Cold start; Frist 1 or 2 stops short distance from where I started; downshifts are noticeable. After that you can barely feel any downshift. The way it is?
Yes, it's just the way it is. I'm used to it now. Goes away very fast.Jerky downshift when cold? My Niro does it too, and so do lots of other cars. Don't worry about it, not a defect.
More likely because it's a not unexpected behavior. Hard shifting when cold is common for basically every type of transmission, manual, conventional automatic, dual clutch autos, you name it. In fact, I would expect DCTs would be particularly susceptible to this sort of thing since they are conventionally clutched (no torque converter to soak up shocks) and hydraulically operated making them strongly dependent on fluid temperature.Posting it is not a defect; because others have reported here, or, told so by a Kia Niro Service Tech?
Fair, but my point remains, a conventionally clutched transmission lacks the shock absorbing ability of a torque converter. In addition, geared trannies in passenger vehicles almost always use synchronizers to match shaft speeds when shifting, regardless of how the shift is actuated. Syncros are operate via friction and so are strongly dependent on the properties of the lubricant which is a function of temperature.The Niro DCT is electrically switched, no hydraulics. Nor is it a wet clutch which might also reduce the impact of a cold downshift. The engine clutch is hydraulic.
Well, there certainly is oil in the transmission. So perhaps synchro function is the key to cold downshift issues. Thanks for that, I've have been trying to figure out how that happens. I kept going back to a now irrelevant question of why the dry DCT clutches would operate differently when cold.In addition, geared trannies in passenger vehicles almost always use synchronizers to match shaft speeds when shifting, regardless of how the shift is actuated. Syncros are operate via friction and so are strongly dependent on the properties of the lubricant which is a function of temperature.
Yeah, when you start to think about it, these things are devilishly complicated and it's surprising they work as well as they do.I kept going back to a now irrelevant question of why the dry DCT clutches would operate differently when cold.