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Re: X-trail's 4wd system overheating problem ?
Hi guys,
I tried it all when i was on the beach. Tried changing modes whilst stationary/moving-fast/slow. It didnt make a difference. Once the computer decided what to do, it just did it.
I found that if auto mode was selected in the soft sand, it had a tendancy to bog down on the front end before the rear would engage, often too late. In lock mode however, it got moving easier.
Once again i will talk to nissan, but i feel i will be wasting my breath. The usual answer will be- havent seen that one before, you can be the test guinea pig.
---
2008 T31 TS Manual Turbo Diesel
"Bells and whistles"
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7/Dec/2008, 8:45 am
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Re: X-trail's 4wd system overheating problem ?
cartsT31
Have a look at the review in 'T31 X-Trail (Turbo Diesel)' section, titled "another review".
There is a report about driving on sand pros and cons and finding out the hard way (trial and error).
Tony
--- Tony X-891c
2008 T31 St
HERE is my X Trail
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7/Dec/2008, 8:56 am
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Re: X-trail's 4wd system overheating problem ?
Hi Guys,
Just thought I would pass on my recent experiences with the 4WD system. Watch out for soft sand.
Regards
Shane
Last edited by Budgie8, 16/Feb/2009, 7:52 pm
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4/Jan/2009, 10:33 am
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Re: X-trail's 4wd system overheating problem ?
it's tough to know when to use the lock mode or keep in auto. I've done a few trips on the beach and I tend to leave it in auto except for the entry/exits to the beach or camping ground etc. I've never had the overheating problem, but I tend not to use it too much for that exact reason. I find that by the time you need lock, it's too late because you have to stop to put it in lock mode.
On the weekend just gone there wasn't any run up on the hard sand to the beach exit and I found myself in auto mode manual 2nd gear on the boggy soft sand. It started to bog down, quick change into 1st gear and we kept going, however I thought we were going to be bogged for sure.
Having to stop to engage lock in my opinion isn't great because when you determine you need it, a lot of the time it's too late.
The difficult thing I find is what gear to be in on really soft and boggy and rutted sand. I find 1st gear gives you plenty of revs with a nice controlled speed where as 2nd gear you have to go too fast to be in the power band and bogs down at slower speed. Biggest tip is to keep in the already formed tracks.
On less rutted and boggy 2nd and 3rd gear is good - 3rd gear sometimes too much speed.
It would be good to get an idea of how long people have driven in lock prior to overheating.
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4/Jan/2009, 11:39 am
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Re: X-trail's 4wd system overheating problem ?
are you all saying that you have to actually stop the vehicle to put it into lock mode? I have never done that when i have gone offroad, i've always put it in lock mode while driving and it seems to engage fine.... i have never driven on the sand though, but on ruts and bush tracks with steep hills it works great.
--- Matt, Canberra, X-074
2002 ST
Twilight, auto, nudge bar, tint
Car Pics: HERE |
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27/Jan/2009, 8:10 pm
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Re: X-trail's 4wd system overheating problem ?
quote:
canberraxtrail wrote:
are you all saying that you have to actually stop the vehicle to put it into lock mode?
Yes Matt. It will still engage while in motion but it is not good for your transmission and rear diff.
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27/Jan/2009, 8:44 pm
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Re: X-trail's 4wd system overheating problem ?
yeah the logic is there but i can't believe that you have to stop (and potentially get bogged).
--- Matt, Canberra, X-074
2002 ST
Twilight, auto, nudge bar, tint
Car Pics: HERE |
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27/Jan/2009, 8:53 pm
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Re: X-trail's 4wd system overheating problem ?
Hi All,
I enjoyed some sand action on the weekend, which has got me thinking about our 4wd overheating problem.
First, the story:
We hit Noosa north shore on saturday afternoon for a bit of fun. The tide was up and soft sand was everywhere. I've taken the exy on the beach before, and it handled it no worries, but this time there was pretty much no hard sand to drive on, so i was a little concerned. I was pleasantly surprised how well the exy played in the soft sand, just trucked through everything i threw at it, never missing a beat. There's nothing better than driving around bogged real 4wds in a softroader  . What's even better is that i wasn't really trying; I had 5 people in the car, with the aircon blasting and running 20psi.
Anyways, after about half an hour of tough driving, at the final beach cutting on the way out(whist driving around another bogged statistic my 4wd system dropped out !(danger will robinson, danger) Amazingly, I had just enough momentum and grip on the front to pull me the final 20 metres out of the sand (phew!). Nice one exy.
Second, the idea:
It has been discussed on this forum at length what information the computer uses to work out that the 4wd system is too hot, and shut it down. From reading this forum, there seem to be two theories.
The first one is that the temperature sensors are on the ABS sensors, and this problem can be fixed by trying to cool them down. This theory is untested.
The second one is quite interesting, and is explained well by Kev:
quote:
Revhead Kev wrote:
The odd thing Kevin is that there is no temp sensor in the rear wet clutch.
It seems as though the 4wd system controller "assumes" there is too much temp buildup due to signals from wheel sensors, engine rpm and accelerator position.
If this is true, then the computer calculates these three variables over time, and if they exceed a certain value, it shuts down the 4wd system. Over time, the computer allows the system to turn back on, but once it reaches the threshold, shuts down the system again.
My question is, as these figures are based on time, if you could reset the system, would time go back to zero, and allow you to turn your system back on? Right now I'm thinking of being hopelessly bogged, with the 4wd system overheating, and disconnecting the battery, pumping the brake to pull the power out of the capacitors, essentially resetting the computer, then putting everything back together, and driving off.
Of course this begs the question of doing some real damage to the 4wd system by overheating, but the general consensus of this forum seems to be the overheating protection is possibly overly conservative, and so damage is unlikely.
Thoughts?
Brendan
---
Brendan - X613
2004 Platinum ST Series 2
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6/Nov/2009, 11:59 am
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Re: X-trail's 4wd system overheating problem ?
There is a temp sensor in the rear diff , once the oil in the diff gets to a certain temp the computer shuts down the system and will not reset till the oil temp has cooled .....
--- Wen,rob,em,rach
X-934 (c)
See my X-Trail HERE
flying xtrail / members number / stop light decal /towbar/ driving lights/ roofracks/ |
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6/Nov/2009, 3:04 pm
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