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ahto42 Profile
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Date Registered: 06-2012
Location: Estonia
TOTAL POSTS: 39
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Re:


I know that Kia cee'd auto can do the trick, if you want spin the wheels on take off. ESP must be disabled of coors.

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Member id X-2451
Name: Ahto
Location: Estona, Tartu

Model: T31 II 2012 Diesel Auto, LE
24/Nov/2012, 5:05 am Link to this post Send Email PM   Send Private Message Blog
 
DogTrail Profile
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Date Registered: 05-2012
Location: Sunshine Coast
TOTAL POSTS: 481
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Re: Re:


I couldn't bear the suspense of waiting for other peoples results, so I had to run an experiment myself.

Interestingly, I thought I'd allow a bit of a chirp from the tyres, but not intending a fine-bearing squeal, so at a traffic light I tried the 'modified launch control' at 2000rpm.

Firstly, it did rev up to 2000 with foot on brake with no worries, so there is no over-ride to control rpm under brakes - up to 2000 rpm anyway. It may be different at 6000rpm.

Secondly, acceleration felt enhanced, but as I usually use a 25cm accelerator depression and let the gearbox sort it out, then I am not the ideal subject for this experiment.

However, it did rev up to my desired level of 2000rpm in CVT Drive with foot on brake.

It was in 4wd and did chirp the front tyres when launched even at those low revs. and hit my desired 60kph much faster than usual.

Insert edit: Left the other traffic standing gobsmacked. Only saw them in the rear-view mirrors after the event.

However that is not unduly surprising when applied to my usually conservative driving style.
  
I think the concept is valid, but whether or not it is better/faster than just flattening the accelerator will require more experimentation.

I also think that the experimentation will be both enjoyable and informative.

Edit: Or possibly more enjoyable than informative emoticon

Last edited by DogTrail, 24/Nov/2012, 11:49 pm


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2011/12 Australia:- 2.5 litre petrol 4WD, Series IV ST, CVT with Nissan bonnet & headlight protectors, mats + after-market HD towbar with added step for old dogs. ;) Garmin GPS, K&N air filter, DashMate, Black Pearl Tint , Dirt. X-2429(c).
24/Nov/2012, 11:20 pm Link to this post Send Email PM   Send Private Message
 
Translucidus Profile
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Date Registered: 05-2010
Location: Adelaide
TOTAL POSTS: 599
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Re: X-Trail T31 - CVT transmission


Interesting experiment.

I checked out what I had posted and found the following:

When CVT is in D (Drive) or R (Reverse) pressing brake pedal immediately cuts out any throttle opening. eg if driving along and keeping Right foot on accelerator, pressing brake with left foot immediately cuts throttle to idle.

If in Neutral or Park, whilst revving engine - pressing brake has no effect on engine revs ie throttle active.

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2007 X-Trail T31 ST-L

Xy going vertical at Bendleby Station . . .

4/Dec/2012, 5:35 pm Link to this post Send Email PM   Send Private Message
 
DogTrail Profile
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Date Registered: 05-2012
Location: Sunshine Coast
TOTAL POSTS: 481
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Re: X-Trail T31 - CVT transmission


quote:

When CVT is in D (Drive) or R (Reverse) pressing brake pedal immediately cuts out any throttle opening. eg if driving along and keeping Right foot on accelerator, pressing brake with left foot immediately cuts throttle to idle.



It may say so on paper, but the same does not hold true in practice.

To be certain, I repeated the experiment on a local gravel road.

In 2 WD and CVT Drive, I held the brake with the left foot and brought the revs up to 2200 rpm before releasing the brake and increasing acceleration.

It stood still, merely spinning the front wheels in the gravel. Too much power delivered to the drive wheels for the available traction.

Tried again at the same spot on the gravel, this time in 4WD.

Again, left foot brake, revs up to 2200rpm, release brake and add acceleration.

This time it took off like a cat with a splash of metho on its date: no wheel spin and instant application of traction all round for (almost) neck-snapping acceleration.... if you had a neck made of six strands of uncooked spaghetti emoticon

I can only say that this technique works in my field tests in my car at those RPM's.

A cutoff may apply at higher revs. - I don't know and will probably never find out as I am very reluctant to try a full speed 6000 rpm launch in this relatively new car.

Edit: anyway, that would be wastefully outside the torque band.

It might be interesting to find out if and/or when the rev limiter does cut in but like the temperature cut-out, it might be designed to cut in at a level designed to stop transmission damage, i.e beyond that of reasonable/foreseeable use.

Edit: however it does seem quite happy at the 2200 rpm level.


Last edited by DogTrail, 6/Dec/2012, 2:45 am


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2011/12 Australia:- 2.5 litre petrol 4WD, Series IV ST, CVT with Nissan bonnet & headlight protectors, mats + after-market HD towbar with added step for old dogs. ;) Garmin GPS, K&N air filter, DashMate, Black Pearl Tint , Dirt. X-2429(c).
6/Dec/2012, 12:01 am Link to this post Send Email PM   Send Private Message
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 28941
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Re:


The rev limiter is probably the same as the T30 [sign in to see URL] petrol engine and it is set at either 6,200RPM (for dual cat converter xtrails) or 6,700RPM (for single cat. converter exys). You could try reaching the rev limiter in N while the car is stationary.

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6/Dec/2012, 5:39 am Link to this post Send Private Message MSN Blog
 
cooch t31 Profile
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Date Registered: 06-2008
Location: Blue Mountains, NSW
TOTAL POSTS: 5966
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Re:


Somebody has already tried that in a T31 years ago haven't they?
I think it came close to the 6200 rpm you mentioned Jalal.

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Tony X-891c

HERE is my D22 Navara
HERE is my old 2008 T31, ST Series1

6/Dec/2012, 6:05 am Link to this post Send Private Message
 
Johngqld Profile
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Date Registered: 02-2011
Location: Caboolture, QLD
TOTAL POSTS: 297
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Re: X-Trail T31 - CVT transmission


Hi to All,
           Back on about page 4 of this thread, we had found a video released by Nissan about the CVT8 transmission. It covered a far greater gearing range than the current, could handle toque of a 3.5 litre engine, adaptive shift and so on. Tonight on My [sign in to see URL], I read an article where the new Nissan Pathfinder will have a 3.5 ltr petrol engine and CVT. It wont have separate Low range and the 4wd system is similar to that of the Xtrail. I consider the Pathfinder as the one to have for those who need to tow a van, regardless of Nissan's claim that a Weight Distribution Hitch not be fitted. The new Pathfinder is indeed a radicle departure from what we know and I can't help but think that Nissan have absolute faith in the CVT concept overall. Does it look as though the CVT8 will find it's way into the Xtrail, who knows.

 For the record, my Series 3 has now covered 109,000 klm, six months ahead of where it's warranty runs out and it is going as well as the day I bought it home. It's also pulled the Jayco Hawk about 4000 of those without any issues. It's still disappointing that people with Series 2 CVT issues have to fight so hard to have known problems fixed.

[sign in to see URL]

 Good Motoring
John

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X-1834 (c)
2010 Series 3 CVT Diamond Black. Tow pak, Nissan Nudge Bar, Bonnet and headlight Protectors, Fog Lamps, Radiator Protection, L/H Cargo Drawer,Rear Spoiler, Koason DVD/GPS, Pwr Window Delay.

11/Sep/2013, 9:43 pm Link to this post Send Email PM   Send Private Message Blog
 
frozenpod Profile
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Date Registered: 08-2013
TOTAL POSTS: 33
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Re:


Nissan are using the CVT to save $$$.

In the 90's other manufactures used them (most moved back to traditional autos) and they were on occasion coupled behind small V8's. So correctly designed there should be no reason a CVT cannot handle the load.
12/Sep/2013, 12:45 pm Link to this post Send Email PM   Send Private Message Blog
 
frozenpod Profile
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Date Registered: 08-2013
TOTAL POSTS: 33
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Re:


Some pretty big changes to the pathfinder.

Looks like it is a rebaged Murano.

I also noted on the US sites that the tow capacity is now 5000lb 2250kg, where as the current model has low range and 3500kg tow capacity.
12/Sep/2013, 2:18 pm Link to this post Send Email PM   Send Private Message Blog
 
Translucidus Profile
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Date Registered: 05-2010
Location: Adelaide
TOTAL POSTS: 599
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Re: X-Trail T31 - CVT transmission


Here Nissan owners go again:

Maybe we T31 CVT owners should contact Washington!!!

Multiple Pathfinder CVT issues already.
2013 NISSAN PATHFINDER Problems & Complaints in USA


[sign in to see URL]

All complaints:
[sign in to see URL]


It's a USA Govt site for car recalls & recall notices from the National Highway Traffic Safety Administration and complaints from consumers either directly or as recorded by the Vehicle Safety Hotline.

Last edited by Translucidus, 19/Dec/2013, 12:08 am


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2007 X-Trail T31 ST-L

Xy going vertical at Bendleby Station . . .

16/Dec/2013, 6:58 pm Link to this post Send Email PM   Send Private Message
 


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