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V6 HDi Fuel Consumption
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C6Dave   
Thu Jan 28 2010, 11:05am

Joined: Oct 01 2009
Member No: #1
Location: Northumberland
 OK the torque converter is shown below:




I have added more info to the Technical Guides section - Click Here -
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pclark   
Thu Jan 28 2010, 12:01pm
Joined: Oct 08 2009
Member No: #3
Location: North Yorkshire
 Thanks Dave. Thanks also for all the work you put into the site I think it's superb.
I agree about Wikipedia generally but in this case it appears the writer got his information from the transmission manufacturer's websites so should be ok.
michaelb   
Thu Jan 28 2010, 01:57pm
Joined: Nov 17 2009
Member No: #14
Location: London
pclark wrote ...

Thanks Dave. Thanks also for all the work you put into the site I think it's superb.


Hear hear!
C6Dave   
Thu Jan 28 2010, 04:35pm

Joined: Oct 01 2009
Member No: #1
Location: Northumberland
tonyrome wrote ...

..... I've also found that, whilst the in-gear shifts are very smooth, there can be a jerk when accelerating from standstill. If I let the car creep forward momentarily, ie. no acceleration and no brake, then hit the accelerator, it's smooth. But going from foot on brake to accelerator, it often lurches forward. This could also be a programming issue, so I might get the specialist to take a look when I'm next in the UK.


Tony do you use the electric parking brake?

I never do, I simply leave the car in 'park' (unless it's a very very steep hill) and find the car pulls away from rest OK.

I was taking particular notice today to see if I noticed anything, but didn't.

So are your brakes maybe binding a bit at the rear?
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tonyrome   
Thu Jan 28 2010, 05:19pm
Joined: Nov 22 2009
Member No: #15
C6Dave wrote ...
Tony do you use the electric parking brake?

I use it when parked, yes. But not at each set of traffic lights

C6Dave wrote ...
So are your brakes maybe binding a bit at the rear?

Possible, I suppose but it doesn't feel as though they are. It's also not consistent with that, in the sense that it would likely happen the first few times after driving off, then disappear once the brakes are freed, or happen every time, neither of which is true.

Update: Just realised it can't be brake binding since, as I already mentioned in an earlier thread, the use of Snow Mode on the gearbox completely resolves the problem.
urb   
Thu Jan 28 2010, 09:45pm
Joined: Jan 03 2010
Member No: #26
Location: Stockholm
 From the wiki (AWTF-80_SC): It is designed to handle a maximum of 440 N·m of torque.

This could be the reason that the C6 240HDi has a torque of 450Nm and Jaguar XF with the same engine has 500Nm.
tonyrome   
Fri Jan 29 2010, 10:58am
Joined: Nov 22 2009
Member No: #15
urb wrote ...
This could be the reason that the C6 240HDi has a torque of 450Nm and Jaguar XF with the same engine has 500Nm.

Jaguar must have access to a really robust gearbox, since their XF S model, with the same engine and twin-turbos, has 600Nm of torque...
C6Dave   
Fri Jan 29 2010, 06:56pm

Joined: Oct 01 2009
Member No: #1
Location: Northumberland
 Is the Jag front or rear wheel drive?
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tonyrome   
Fri Jan 29 2010, 08:07pm
Joined: Nov 22 2009
Member No: #15
 Rear wheel drive for the XF diesels. No front drive models in the Jaguar range, I think you'll find - always either RWD or 4WD.
C6Dave   
Fri Jan 29 2010, 11:51pm

Joined: Oct 01 2009
Member No: #1
Location: Northumberland
 That's how they can tune for more torque then

It's very difficult to tame torque steer on front wheel drive
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tonyrome   
Sat Jan 30 2010, 01:41pm
Joined: Nov 22 2009
Member No: #15
C6Dave wrote ...
It's very difficult to tame torque steer on front wheel drive

True. FWD is really more suited to smaller/cheaper cars and I've never understood it being used on executive/luxury cars, which should have RWD or 4WD, IMO. The C6 with 300PS and 4WD would be superb.

Jaguar use a ZF gearbox on the XF, incidentally.
C6Dave   
Sat Jan 30 2010, 02:04pm

Joined: Oct 01 2009
Member No: #1
Location: Northumberland
 Have you tried driving a rear wheel drive BMW / Merc in the snow and ice

I much prefer the C6's added traction with the FWD, but 4 wheel drive would have been a real boon

BTW we had 3" of unexpected snow on top of ice overnight so driving was 'fun' this morning in any car

Roads unploughed and un gritted
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michaelb   
Sun Jan 31 2010, 07:34pm
Joined: Nov 17 2009
Member No: #14
Location: London
 At time of writing this thread has had 296 views!

It must be popping up in a few search engines
tonyrome   
Sun Jan 31 2010, 08:09pm
Joined: Nov 22 2009
Member No: #15
 The temperature here was -3C this morning, so a little warmer than recently but still cold and plenty of snow. With my new DIY Snow Guard - Click Here - in place, I drove 160km (100 miles), almost entirely on quiet Autobahn and tried hard to maximise my fuel economy. I managed to achieve 7.5 l/100km (38mpg) on the outbound journey and 6.9 l/100km (41mpg) on the return leg. However, despite driving at a respectable 120-130km/h most of the way, it involved lots of very gentle throttle and was only really possible because of the lack of traffic.

I just wish the consumption was better when driving normally & more quickly on the Autobahn. I don't expect great fuel economy around town but I would like to see more than the 30mpg or so I had last year during the autumn when driving in normal conditions at higher speeds. Incidentally, when I floored the throttle briefly from a slip road onto the Autobahn today, the trip computer registered 30l/100km (9mpg)!!
David K   
Tue Feb 16 2010, 10:59pm
Joined: Jan 30 2010
Member No: #42
Location: Scania
 When i go to work I have a combination of 70- and 90-km/h roads and also pass through some small villages, and I usually end up around 5.6 l/10 km. The image is from this evening when I ended back home from work.

In my opinion it's not that bad for such a heavy car with a V6 engine.

I usually drive with the gearbox in the Snow mode, and I guess that makes some difference for the consumption. I actually prefer to be in the Snow mode when driving on slower roads, just because I don't see any reason for the engine to go up to 2000 revs before changing gears. It feels more relaxing and suitable for the car with changing around 15-1600 revs instead.

Of course, as you write Tony, I also would like to have lower consumption when driving on autobahn. But I've been driving with diesel BMW 5-series and Mercedes E-klass in Germany, and the consumption of those cars have not been much better than the C6. In my opinion the C6 consumption figures are more realistic than the figures BMW and Mercedes gets in the ECE-cycel.
But if you ask a BMW driver what consumption they have, they always answers "around 5.0..." for some reason.

(Sorry, but I hope all english readers understand the kilometers and liters figures here.)
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