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avtur Member Since: 11 Nov 2006 Location: Stockport Posts: 1306 |
Night fox,
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4th Jun 2007 5:46 pm |
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AndyP Member Since: 09 May 2007 Location: Reading Posts: 101 |
I think LR got suckered into making the headline fuel consumption figures with the 6th gear which is an overdrive. I would have much prefered a much lower optional 1st gear (i.e. normal 1st is what it is now , but there is a gated 'super low' for off road , and dealing with heavy trailers etc) |
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4th Jun 2007 7:00 pm |
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NightFox Member Since: 11 May 2007 Location: North Shropshire Posts: 353 |
I've only got just over 1000 miles on the clock, but no way does it feel like it could ever hold 30mph in 4th... I find that I won't change up unless I've got >2200rpm in the current gear, which tends to be about 1500rpm in the next gear up; anything less than 1500rpm and the engine feels like its on the edge of stalling. Can't imagine there being anything mechanically wrong though, as I'm getting a good 37mpg. Does anyone know if any of the software updates have done any major remapping of the ECU? |
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4th Jun 2007 7:09 pm |
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avtur Member Since: 11 Nov 2006 Location: Stockport Posts: 1306 |
I know where you are coming from, though I would suggest that they have put 1st slightly lower than 'normal' (it is lower than reverse for example) but would agree that from an 'off-road' perspective they could have gone lower in the manual box. Interesting to note that the ratio for first on the auto box is notabley lower than the manual, (3.750 vs, 4.148) and with a torque converter on top of that no wonder most people agree the auto is hte better off roader. Though all other ratios are exactly the same for both boxes. |
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4th Jun 2007 8:17 pm |
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avtur Member Since: 11 Nov 2006 Location: Stockport Posts: 1306 |
Mine is a very early car, delivered first week Jan, to date no ECU updates. I can drive all day at way less than 2200rpm and the engine keeps pulling. As I've noted on another thread it will happily climb a 1 in 4 gradient (in 1st gear) at tick-over with over 500kgs in the car. my impression is that the engine is terrific at low speed. |
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4th Jun 2007 8:24 pm |
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NightFox Member Since: 11 May 2007 Location: North Shropshire Posts: 353 |
Maybe I just need convincing that the engine is happy below 1500rpm. Guess I need a trip to a dealer and either a drive in another TD4 or someone to drive mine and tell me I'm wrong. Or maybe I need to lay off the pies? |
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4th Jun 2007 8:31 pm |
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Tim in Scotland Member Since: 12 Mar 2006 Location: All at sea Posts: 875 |
I'm not a engineer and don't know much about the operation of engines at their best revs/power/torque for econonmy or performance but to me the best revs economy for any given gear is where it is on point of the maximum torque so you let the engine do it's thing without stressing it. The torque curve for the F2 flattens out at about 1900/2000 rpm which should be the best revs to keep it at for performance and econony in any gear How can carbon have a footprint, it has no feet?
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5th Jun 2007 10:06 am |
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pelyma Member Since: 19 Feb 2006 Location: Patching Posts: 366 |
Nightfox, the posts you were talking about were by BN and explained that keeping the car around its maximum torque gave best fuel economy, on my D3 that means 2000 revs and the gear box learns your style of changing. I haven't had much of a drive of the Fl2 (wife won't let me ) but I expect it will be similar. D4 HSE Lux for me
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5th Jun 2007 2:07 pm |
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NightFox Member Since: 11 May 2007 Location: North Shropshire Posts: 353 |
Ah yes, BN, that's the chap. Thanks. It's a pity that 2000rpm doesn't coincide with an "urban cruising" speed of either 30 or 40mph, it tends to be either 1750 or 2250, depending which way you go with the gears. Having said all that, tried driving 30mph in 4th this morning and it felt a lot better, so I guess the engine must have eased up a bit over the last couple of hundred miles without me noticing. |
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5th Jun 2007 3:07 pm |
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carlfraz Member Since: 10 Apr 2007 Location: Minkies lap dancing club Posts: 839 |
Read the threads..... tried the gears out.......no problems that I have noticed and sat ticking over at 32mph in 6th!!! 900rpm..no engine strain... quite happy .... got to an incline dropped into 4th and pulled away fine. I have found as long as you do not expect a miracle from the car they do great...literally they will 'tick over' in any gear as long as the engine is not under strain. If you are being unrealistic don't complain. My gear box is a dream whether driving like Miss Daisy or Mr Schumacher |
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5th Jun 2007 7:03 pm |
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