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RonV Profile
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Date Registered: 02-2007
Location: North Shore, Sydney
TOTAL POSTS: 302
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X-Trail T31 - CVT transmission


I've collected some articles on CVT transmissions in general, as this is a new gearbox to the X-Trail seemed like a good idea to start this subject off.

Originally developed by DAF, in the mid 1980s a company called Van Doorne's Transmissie further developed the transmission. The main changes at this time was going from a "pull" system to a "push" system, and the belt changing to a metal belt at this time. In the mid 90s Van Doorne's transmissie became part of Bosch in 1995.

Basics of CVT transmissions: ]here. A nearly 5 minute 21Mb movie showing the workings of the CVT is available on the right. It's a big download but worth seeing.

Working Princlple: ]here

CVT transmissions were also used by the Williams F1 team in 1993 but FIA regulations changed quickly so they could not be used. It was claimed that an F1 car with CVT took 1-2 seconds off circuit laps compared to conventional shift cars. A video of David Coulthard driving the F1 test car is one of many articles about the CVT being banned from F1 is [url=[sign in to see URL]]here.

Admin Edit: Thread title changed from Series III to T31 X-Trail

Last edited by jalalski, 2/Dec/2007, 2:31 pm


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Ron X563

2011-current X-Nissan owner
2008-2011 X-X-Trail owner
2005-2008 X-Trail Ti-L

Turramurra, NSW
16/Oct/2007, 12:05 am Link to this post Send Email PM   Send Private Message
 
Dunoon Profile
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Date Registered: 06-2005
Location: Orange, NSW
TOTAL POSTS: 269
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Re: Series III - CVT transmission


In addition to my X-trail, I also have a new Maxima with CVT transmission.

I think the CVT is wonderful and can't understand why all manufacturers do not use it.

The only way that you know it is working on a hill is to watch the gradual increase in engine revs and then watch them reduce as the hill flattens. It is very smooth with no sensation of changes at all. Additionally, when overtaking there is absolutely no jerking or high and sudden revving of the motor.

In regard to fuel economy, on a recent country highway run, from Orange to Dubbo and return sitting on the legal speed (110 K for about half the distance), according to the car computer it averaged 8 lit. per hundred. around town of course it is more. Actually, overall with a mix of town and country I feel it would be much the same as the X-trail that is lighter and with a smaller motor.

Additionally, it can be used as a six speed manual, but I do not know why anyone would want to.

I feel certain that the CVT in the new X-trail will transform it.

---
John,
From Orange NSW.
My rides are:
2002 TI Auto (Series 1) in Twilight, and
2007 Maxima in Bright Silver
2008 Piaggio MP3 400 in Black
Member number: X165
16/Oct/2007, 9:55 pm Link to this post Send Email PM   Send Private Message MSN Blog
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 28890
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Re: Series III - CVT transmission


Here is one aspect of an x-citing drive gone LOL emoticon

I love the feeling and the reaction I get when you floor that pedal and the whole car comes to life, that's how you can tell you have something extra under the bonnet emoticon

Don't think being pushed by the CVT will excite me that much, but I still reserve the right to judge it when I drive it, as I haven't tried it before.

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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 28890
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Re: Series III - CVT transmission


Hi Guys,

Here is how the T31 x-trail CVT transmission works in Manual Shift Mode (very interesting)

--Log in or sign up to see linked image content--

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leongster Profile
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Date Registered: 07-2007
Location: Singapore
TOTAL POSTS: 46
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Re: Series III - CVT transmission


Good video!

Isn't the Nissan CVT different to the Bosch system?

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eddie


2004 X-trail 2.5 Auto.
2/Dec/2007, 1:58 pm Link to this post Send Email PM   Send Private Message
 
Dunoon Profile
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Date Registered: 06-2005
Location: Orange, NSW
TOTAL POSTS: 269
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Re: Series III - CVT transmission


Re the following:
quote:

Here is how the T31 x-trail CVT transmission works in Manual Shift Mode (very interesting)



and in particular the last para re flooring the accelerator to change down on a hill when in "D" mode;

I have never had to floor the accelerator to change down with my Nissan CVT.
On open road runs I mostly use cruise control and the accelerator stays steady and the engine revs increase slowly on a (steep) hill, otherwise there is no indication that anything has happened at all.

To pass another vehicle and depending on the urgency a partial pressing of the pedal gets the desired result.

Around town I only treat the accelerator as I would a normal auto transmission and never have to floor it, unless I am testing the great acceleration or showing off !!
Incidentally, when changing manually by flicking the lever forward or back, the change is virtually instantaneous.

Last edited by Dunoon, 7/Dec/2007, 12:34 pm


---
John,
From Orange NSW.
My rides are:
2002 TI Auto (Series 1) in Twilight, and
2007 Maxima in Bright Silver
2008 Piaggio MP3 400 in Black
Member number: X165
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jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 28890
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Re: Series III - CVT transmission


quote:

leongster wrote:
Isn't the Nissan CVT different to the Bosch system?



Yes it is different.

The X-TRAIL CVT Transmission is manufactured by ]JATCO and it is the JF011E type.

]--Log in or sign up to see linked image content--

Last edited by jalalski, 10/Dec/2011, 7:12 am


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2/Dec/2007, 2:22 pm Link to this post Send Private Message MSN Blog
 
RonV Profile
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Date Registered: 02-2007
Location: North Shore, Sydney
TOTAL POSTS: 302
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Re: X-Trail T31 - CVT transmission


When reading the Bosch site I think all they do is manufacture the metal push belt itself, then sell this. They mention on their website that Japan is one of their biggest markets so it looks like they supply these belts to JATCO.

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Ron X563

2011-current X-Nissan owner
2008-2011 X-X-Trail owner
2005-2008 X-Trail Ti-L

Turramurra, NSW
2/Dec/2007, 10:24 pm Link to this post Send Email PM   Send Private Message
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5203
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Re: X-Trail T31 - CVT transmission


It would be interesting to know if a CVT from the T31 could be fitted to a T30 auto.
I would assume with the QR25DE being the same and supposedly the floor pan being the same, then it would only be the electrics which might be tricky.

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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3/Dec/2007, 1:51 pm Link to this post Send Email PM   Send Private Message Blog
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 28890
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Re: X-Trail T31 - CVT transmission


It can't be done Kev.

Two different platfroms between the T30 (which is the FF-S Platfrom) and the T31 (which is the C platfrom)

Last edited by jalalski, 3/Dec/2007, 2:32 pm


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