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post #1 of 6 Old 09-16-2016, 08:35 PM Thread Starter
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Driving behavior Q

Hell, im new here, just got a 2015 versa automatic pure drive with 19k miles. i love the car. i believe its the cvt transmission?
i have a few questions. Sorry for spamming the site

1. while slowing down to a complete stop, right before the car stops it feels like it brakes more? almost like dropping a normal automatic into 1st. is this normal? no noises or clunks, almost like if i applied more pressure to the brakes feeling. ive coasted to a complete stop in neutral and the car doesnt do it, only in drive.

2.i believe theres no gears. but while cruising in city at like 1500 rpms it feels like the car shifts into a second gear and pick up more speed effortlessly? is this normal? again no clunks or noises. just something i notice.

3.sometimes when accelerating out of a complete stop it will just glide effortlesly and stay under 2000 rpm. but sometimes it will go up to 3000 ish rpms and almost feels like when your accelerating a car with a slight cluth slip. like some power isnt goin to the tires. is this normal?

Thank you for your time, and again sorry for spamming questions that have already been answered.
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post #2 of 6 Old 09-18-2016, 06:23 AM
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This may be the answer to your second and third questions.

Nissan Adds Faux Shift Feel to All CVTs for 2015 AutoGuide.com News
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post #3 of 6 Old 09-21-2016, 07:46 PM
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Quote:
Originally Posted by CRF250Xrider View Post
Hell, im new here, just got a 2015 versa automatic pure drive with 19k miles. i love the car. i believe its the cvt transmission?
i have a few questions. Sorry for spamming the site

1. while slowing down to a complete stop, right before the car stops it feels like it brakes more? almost like dropping a normal automatic into 1st. is this normal? no noises or clunks, almost like if i applied more pressure to the brakes feeling. ive coasted to a complete stop in neutral and the car doesnt do it, only in drive.

2.i believe theres no gears. but while cruising in city at like 1500 rpms it feels like the car shifts into a second gear and pick up more speed effortlessly? is this normal? again no clunks or noises. just something i notice.

3.sometimes when accelerating out of a complete stop it will just glide effortlesly and stay under 2000 rpm. but sometimes it will go up to 3000 ish rpms and almost feels like when your accelerating a car with a slight cluth slip. like some power isnt goin to the tires. is this normal?

Thank you for your time, and again sorry for spamming questions that have already been answered.
1. I definitely feel engine braking when I let off the gas pedal. It doesn't "coast" like my previous cars with conventional automatics, at least the ones that had some slip in the transmission. I don't like the engine braking but the only other alternative would be to shift into neutral while the car is still moving forward, which is dangerous for the CVT so I very rarely, if ever, do it.

2. I feather the gas pedal so that the engine speed's normally around 1,200-1,300 rpm in city driving. The CVT "shifts" anywhere between 19-25 mph. That's because the 2nd generation CVTs (starting in Model Year 2012 for the Versa sedan and in Model Year 2014 for the Versa Note) have a sub-planetary gearset (auxiliary gearbox) that essentially combines the pulley-belt system of a CVT with 2-speed gearing. It's like combining a CVT with a 2-speed conventional automatic to expand the gear ratios, allowing for shorter gearing for more power and taller gearing for better fuel economy. Here's a video from Jatco (who manufactures the CVTs for Nissan vehicles) explaining the 2nd generation CVTs:

CVT with an auxiliary gearbox for mini and small FWD vehicles | JATCO Ltd

3. I have the same slip when the car first accelerates from a complete stop. It slips for 2-5 seconds before it settles down and catches. It will also sometimes slip when I press back down on the gas pedal after I had taken my foot off the gas pedal (i.e. coasting while the car is still moving forward) and then it will settle down and catch after 2-5 seconds; this happens more often when the A/C is on. This is "normal".

You should check out the link. It's really fascinating. Personally I love my CVT.

2014 Versa Note S Plus, Metallic Blue Paint
Built in July 2013. Bought on September 28, 2013.
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post #4 of 6 Old 09-23-2016, 08:58 PM
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The Versa CVT is constantly reacting to the position of the gas pedal. Not only in terms of how far you press the pedal in but also how fast you push it in. The engine management can also detect the inclination of any slope in the surface the car is driving over based upon engine load and throttle position. So, even placing the throttle at the same position but driving up a slight incline will change the gearing in the transmission. Steering wheel position, i.e. taking a sharp right turn, will also cause the transmission to alter it's gearing ratios. I found out when taking a right turn that you feather the gas just right you can actually get the inside tire to peel out and lay down a pretty good tire squall.

The operating temperature of the engine and the CVT will also change the way the car drives as well. When it's cold the engine management will use a known set of safe values that the power train is capable of handling under all conditions. But as the car warms up to normal operating temperature more variables from the various sensors all over the car begin to become included into the cars overall performance, fuel economy, and emissions output. For instance, there is a lock-up style clutch in the CVT's torque converter that doesn't engage at highway speed until the transmission reaches normal operating temperature.

Also Nissan considers the engine braking of the CVT engine to be a feature rather than a hindrance. It reduces the overall wear and tear on the braking system since the transmission drag will help reduce the amount of brake you need to apply. I would tend to agree that this is a good thing since I've got about 87,000 miles on my car and am still on the original set of brake pads that came with the car.
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post #5 of 6 Old 09-23-2016, 09:03 PM
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Originally Posted by HeftyJo View Post
Also Nissan considers the engine braking of the CVT engine to be a feature rather than a hindrance. It reduces the overall wear and tear on the braking system since the transmission drag will help reduce the amount of brake you need to apply. I would tend to agree that this is a good thing since I've got about 87,000 miles on my car and am still on the original set of brake pads that came with the car.
I'd rather use the brakes than the transmission or engine to slow down the car. It's cheaper and safer to replace $80 brake pads/shoes than to pay thousands to repair/replace a CVT or engine.

2014 Versa Note S Plus, Metallic Blue Paint
Built in July 2013. Bought on September 28, 2013.
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post #6 of 6 Old 09-23-2016, 09:32 PM
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Seeing as Nissan actually designed this behavior into the transmission they've likely built the hardware up to spec to be able to handle it. In general you want to avoid heavy use of engine braking with a manual transmission as it will wear out the clutch. And in that case, yes it's much cheaper and easier to hang a new pair of pads than to replace a clutch plate.
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