continuing questions on cvt etc

Post by **skiperoo...107** » Thu Sep 03, 2009 2:37 pm

as described in a previous topic i had a new transmission at 33000km now at 65oookm no further problems except the following:

1, if i am driving at 100km/hour and put the car in neutralit starts to make guggling sound like it is slipping something in the transmission

2. if am driving at 100 km/hour and am coming up to a stop sign and am lslowing down.....if I put the car into neutral and let it glide to a stop at a very low speed it makes the most horrible guggling sound again and

3.. if i am driving at say 50 km and put the car in neutral it makes the slipping sound but if i put it in drive again the sound goes away... it sounds like if there is no connection to the drive system there is slack

Post by **kerrton** » Thu Sep 03, 2009 3:33 pm

Not sure about the "guggling" sound, would you say this is the equivalent of a rattle or grinding?

So at low parking lot speeds you don't get any noises, not even for a moment, whereas with your original defective transmission you did have these sounds?

Post by **wifes rogue** » Fri Sep 04, 2009 1:56 am

Just wondering, but why when going 100km, you would put the rogue in neutral?And when slowing down, and putting in neutral, you may be saving some gas but you are putting more wear on your brakes. Its not like a standard car that you can just coast in neutral. sorry just my thought on it.

Post by **Pescakl1** » Fri Sep 04, 2009 3:24 am

Putting the car in neutral at high speed is a bad idea:- It puts a lot of stress on the drivetrain (quite a lot of load to no load fast).- It does not save fuel as the car has to put fuel in to keep the engine running.- You lose partial control of your car as you have no more way to accelerate if needed (putting back to drive at high speed is an even worst idea).- You put a lot of stress on your brakes, taking the risk of overheating them and losing them.

The only benefit of playing with the "gears" while driving is if you want a new transmission faster .

Post by **baz** » Fri Sep 04, 2009 5:30 am

I would have to agree with Pescakl1, when I took the National Association of Professional Drivers course for work the course material stated that you should never take the vehicle out of "gear" at any speed. If for any reason you need to react by accelerating your time to acceleration has now increased. Also I would think that by putting the CVT back into drive at 100 Kph would prematurely wear out the belt.

Post by **skiperoo...107** » Fri Sep 04, 2009 8:09 am

no when the car is travelling at low speed and you put it in neutral the noise in the front end starts ..it sounds like a combination of a belt too loose and with that movement it has the play to a vibration noise or that the front bottom of the engine is breaking apart ....

now when the car is in gear at low speeds it makes little noise

at the moment when the car is in gear and being driven with the petal on the metal ...it goes like stink... give it something slower to think about on the decelerating side and it starts to have problems...it is almost like the computer is not finding out the speed on the slowing down side fast enough or if it is it does not know what to tell the unit what to do

Question

is there in fact a new cvt transmission or is that bs.

what startles me is that nissan had a long time to get this right in its testing ...is the same cvt transmission problems present for the other models

if not then it is something else assuming the trannies for all vehicles is the same

Post by **skiperoo...107** » Fri Sep 04, 2009 8:15 am

sorry to say this buit what is the difference between an automatic driving in neutral cvs a std driving in neutral...both a idling as if they were just running

the reason i do it is simple on the way home i have a 10 km stretch that is down hill that does not require any braking whatsoever...it saves apile of gas and has no effect on brakes as the speed can slow the car down a little at a time and at the bottom of the hill i can apply drive again the the revs come back into play....

just as a point i can t understand why folks dont put the car in neutral more often when the really dont need the higher revs for being in gear when it does not matter for speed anyway.

Post by **kerrton** » Fri Sep 04, 2009 9:08 am

Leaving it in gear (d) will save you fuel, because you are using your momentum to power the engine and no fuel is required, as soon as you put it in N then the engine has to immediately start burning fuel to keep the engine idleing. The wildcard in this is the engine braking of the CVT, which skews this scenario a little bit, as well as other factors such as do you have to stop at the bottom of the hill, or just keep going etc..

The difference between a manual and auto regarding putting into N at high speeds is the clutch. The manual clutch is designed for shifting in and out of gear while the car is in motion, the auto does the same but in a different way and N is not within the designed intended use at high speeds. I'm not an engineer and that is the most detail I can give you, perhaps a transmission expert can back up what I've stated.

Post by **CALGARIAN** » Sun Sep 06, 2009 12:08 pm

NISSAN XTRONIC CVT CAR have same problem news in CHINA NOW.1.CRASH by forgot break release.2.continue high speed(160Km) drive for 3 hours, speed down,transmission noice (High shrill), failed .3.GAS padel fail, switch to M no response? stop engine restart.4.computer check show many alert.

Modified by CALGARIAN at 3:18 PM 9/6/2009