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Home > Technical > Auto box feels laboured at low revs on 190 |
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druand Member Since: 07 Sep 2009 Location: south ayrshire Posts: 825 |
Alex, once again you have come up with the answers.
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3rd May 2011 3:26 pm |
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Ralphk Member Since: 03 Apr 2009 Location: Skulking around with me golf clubs Posts: 476 |
Sorry I am late coming into this guys but I can agree with what Landynut says about moving into sport mode to make slow speed driving more comfortable. My TD4 has just been serviced and the upgrade to the transmission management system was done. The result is that the ride is less comfortable at slow speed than previous with the trnsmission "hunting" below 1900 to 2000 revs. By pushing the lever into sport mode this ensures a lower gear is held and cures the problem. Ralph
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4th May 2011 7:59 am |
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JonL Member Since: 24 Mar 2011 Location: East Yorks Posts: 26 |
So the "upgrade" has made the car worse? How old is your car? I am assuming I must be on the latest software ('11 SD4) Regards, Jon |
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4th May 2011 8:21 am |
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jaksbak@freel2 Member Since: 26 Dec 2010 Location: Fraser Coast Posts: 225 |
Thanks Alex. I've been trying "Command shift" today and it is taking a bit of getting used to, since the SD4 is so quiet and I normally change gears upward, based on the sound of the engine. It serves to keep power accessible (if needed) coming into roundabouts and corners. Early days. I have definitely been noticing the computerised braking to charge the battery once you take your foot off to cruise up to traffic lights or corners. It's been very strong over the past fews days so I have to adapt how far out I start to "cruise". I think this is brilliant technology, not new, but very practical now that fuel efficiency is so important. |
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4th May 2011 9:11 am |
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Ralphk Member Since: 03 Apr 2009 Location: Skulking around with me golf clubs Posts: 476 |
JohnL the car has the latest upgrade - serviced two weeks ago - and at this time I think that the car is not as smooth as it was before. I am going on holiday at the weekend to South Wales and will be pulling the van (sorry but there it is!) and I will review the situation when we return. If no better then it goes back for a rethink. Ralph
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4th May 2011 9:44 am |
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Ralphk Member Since: 03 Apr 2009 Location: Skulking around with me golf clubs Posts: 476 |
JohnL, again apologies. The car is March 09 -TD4 auto. Ralph
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4th May 2011 9:45 am |
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JonL Member Since: 24 Mar 2011 Location: East Yorks Posts: 26 |
So it would seem to be a software thing, with the most recent software putting economy over refinement/safety. I wonder if land rover or a third party can offer an improved transmission software, maybe even a custom software? |
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4th May 2011 5:35 pm |
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oldgeezer Member Since: 09 Apr 2011 Location: Wiltshire Posts: 1302 |
Ralph
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5th May 2011 4:56 pm |
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JonL Member Since: 24 Mar 2011 Location: East Yorks Posts: 26 |
I have been trying out command shift recently and find something a bit strange. Because the gearbox will change down automatically to prevent the engine labouring I have only been changing up manually and letting the gearbox change down automatically. Whilst driving like this the engine is never allowed to labour as it is prone to do in drive. I can't even up-shift manually to replicate the labouring as described in this thread because the gearbox won't let me labour the engine. So why does this labouring happen in D? I have also noticed that the engine picks up better from circa 1200 revs driving like this whereas in D it can really struggle.
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10th May 2011 7:24 pm |
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alex_pescaru Member Since: 12 Mar 2009 Location: RO Posts: 4642 |
That fluctuation is when the TCC (torque converter clutch) engages and therefore linking directly the engine's output to gears inside the box. From that moment, the box is like a manual. No energy waste on torque converter.
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11th May 2011 6:02 am |
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JonL Member Since: 24 Mar 2011 Location: East Yorks Posts: 26 |
Thanks Alex that explains it very well.
Sorry if I wasn't clear, but I was only trying to change up early to labour the engine to replicate what the car does itself in D, just out of interest to help me understand what I see as a fault of the gearbox. The point I was making is that the car won't let me select the wrong gear and therefore labour the engine, but will do so itself in D. I find that quite strange. It drives much better in command shift, with bags of lowdown torque that just doesn't appear to be there in D. As you say, best performance is 2000rpm +. |
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11th May 2011 7:25 am |
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simont Member Since: 15 Feb 2011 Location: Sunderland/Newcastle Posts: 1809 |
Is this a similar issue that one of the forum members had until they added the additional earth connection? 2002 Honda VFR800
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11th May 2011 9:00 am |
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Past master Member Since: 30 Jun 2010 Location: Isle of Ely Posts: 2710 |
JonL
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11th May 2011 9:19 pm |
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jaksbak@freel2 Member Since: 26 Dec 2010 Location: Fraser Coast Posts: 225 |
After 3 days bush & beach with the new SD4 (still running it in!), I found Sports mode to be a great all-round option for offroading as it kept the revs up in case responsiveness was needed at short notice without working the engine too hard. My observations were that if any of the 3 special Terrain Response modes are selected, sports mode didn't work and by shifting the gear lever to the left, you were in fact selecting Command Shift straight away. This caught me out a few times when the going was tough and I needed to increase revs sharply (eg: soft sand suddenly covering the track) or decelerate quickly (eg: severe washouts in the track). Can anyone enlighten me here as this would suggest that there is 1 standard mode, sports mode (only aplicable in normal) and 3 special terrain response modes. ie: 5 modes in total rather than 8 (Std/Sport x 4). I'm now confused just typing this!
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12th May 2011 10:55 am |
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