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Home > General > First Automatic - Driving Tip Please? |
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The Laird Member Since: 08 Feb 2009 Location: Gargano Posts: 46 |
but can anyone answer the question, so I know why I died? 09 HSE Auto Lago Grey/Almond Napoli. Privacy glass. |
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10th Feb 2010 10:27 am |
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mcphersonstrut Member Since: 21 Jul 2009 Location: In the land of 2 wheel drive and 60mpg Posts: 2164 |
The vast majority of auto drivers just hold the car on the brake just through lazyness. It takes two seconds to put the hand brake on and knock it into neutral.
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10th Feb 2010 10:28 am |
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The Laird Member Since: 08 Feb 2009 Location: Gargano Posts: 46 |
Losing power was the intention 09 HSE Auto Lago Grey/Almond Napoli. Privacy glass. |
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10th Feb 2010 10:28 am |
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Matthius Member Since: 21 May 2008 Location: Warsaw Posts: 42 |
I cannot agree with that. Auto gearbox is designed to work on D - and that includes short stops. Certainly longer that few seconds. Every auto gearbox specialist I know says, that there's no such thing as "extra strain" if D is engaged while brakes are applied. Bear in mind, that only D provides the box with sufficent pressure for proper lubrication. Switching to P or N makes it drop from about 50psi to 5psi. Before you move again on D, it'll take some time to build up the pressure back to its working level. Now, that's actually something that may put extra strain on the gearbox - pressure applied/released/applied/released. Better keep it at a constant level, until you stop for longer than a few minutes. |
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10th Feb 2010 10:41 am |
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Matthius Member Since: 21 May 2008 Location: Warsaw Posts: 42 |
See my post above. On N, the gearbox will not be lubricated properly, due to the working pressure going down about 10 times. It's like running an engine with not enough oil. Death, hot and smelly. |
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10th Feb 2010 10:45 am |
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The Laird Member Since: 08 Feb 2009 Location: Gargano Posts: 46 |
Just bumping my question Can anyone answer it? 09 HSE Auto Lago Grey/Almond Napoli. Privacy glass. |
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10th Feb 2010 10:47 am |
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npinks Member Since: 28 Jun 2007 Location: Ls25 Posts: 20090 |
i should have added to my reply above, that you don't need to touch the brake, it just allows you to shift to neutral
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10th Feb 2010 11:08 am |
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xtattsbox Member Since: 26 Jan 2010 Location: Suffolk Posts: 413 |
Simple. If you put the car in neutral there is no drive to the wheels, no engine braking. If anything happened that required you to react quickly, you would not be able to. The braking would rely completely on the brakes. Features like the DSC and Anti Roll over thing rely on drive to the wheels. Sooo. Simply put, you will eventually get in a whole shed load of trouble. Hi Darling, I'll be home in 10 mins. If I'm not back, please read this message again... |
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10th Feb 2010 11:21 am |
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Matthius Member Since: 21 May 2008 Location: Warsaw Posts: 42 |
I guess the damage won't happen instantly, but the lack of proper lubrication will eventually build up some wear and tear within the box. Some car makers specifically warn against the practice, Subaru being among them.
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10th Feb 2010 11:21 am |
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The Laird Member Since: 08 Feb 2009 Location: Gargano Posts: 46 |
Thanks xtattsbox The situation that I was thinking of was that I was already in a shed load of trouble (as I said Toyota has a problem of sticking accelerator so what would you do if faced with the same problem?) So, my situation is I'm driving at 70 mph (maybe in Cruise) and something jams and FL2 will not slow down. In a Manual I would select neutral (something I have done many times even without a problem). I have never done it with an Automatic. I still want to know if I should touch brake pedal to do it, or can I just slip it in Neutral without any consequences, other than: a) no drive to wheels - that is what I wanted to achieve b) no DSC and Anti Roll - I guess not but in situation I already have a prob c) no engine braking - that's interesting; the engine is running (I haven't turned it off) so is that statement correct? d) if c is correct, then will I have lost power steering? Sorry, one question leads to many (but I don't want to be typing on here when it happens 09 HSE Auto Lago Grey/Almond Napoli. Privacy glass. |
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10th Feb 2010 11:46 am |
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xtattsbox Member Since: 26 Jan 2010 Location: Suffolk Posts: 413 |
A little fatalistic if nothing else!! a) Correct b) It will still be there, just not as effective c) Engine braking is achieved by the drive of the car and the compression in the engine, so that will be gone d) Nope, the power steeering has a separate pump. e) You have a Landrover Freelander, not a Toyota!!! Hi Darling, I'll be home in 10 mins. If I'm not back, please read this message again... |
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10th Feb 2010 11:52 am |
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Matthius Member Since: 21 May 2008 Location: Warsaw Posts: 42 |
C) YES, no braking (the transmission will not apply the torque converter, if I'm correct) D) NO, power steering will still work. |
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10th Feb 2010 11:52 am |
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commando Member Since: 27 Apr 2007 Location: lancashire Posts: 208 |
Can you put the auto into neutral at 70 mph? Stornaway grey SE auto with 18" alloys |
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10th Feb 2010 12:21 pm |
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alex_pescaru Member Since: 12 Mar 2009 Location: RO Posts: 4642 |
The internal pump of the gearbox is driven by the input shaft. So the pressure (and lubrication) is dependant on engine RPM, not the position of the selector. You are confusing the pressure(s) needed to engage gears (the one(s) direct dependant of the status of the gearbox valves - opened, closed, PWM driven) with the pressure generated by the pump, which is always constant as long as the engine RPM is constant (you could say it "main pressure" - the one used for lubrication too). So as long as the engine is running, the gearbox is lubricated, no matter in which position is the selector. Indeed, it is not recomended to tow the car with engine off, because THEN the box isn't lubricated (because the input shaft and implicit the pump which is directly driven by the engine has 0 RPM) and could result in internal damage. |
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10th Feb 2010 12:25 pm |
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