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cc101 *
Joined: 19 Feb 2012 Posts: 19 Location: South Wales
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Posted: Sun Mar 11, 2012 19:30 Post subject: P R N 2 L |
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Hi all, I was just wondering when you would actually use 2 and what would you use L for on the auto gearbox selector.
Cheers. |
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Posted: Sun Mar 11, 2012 19:30 Post subject: Google Ads keep the POCUK free to join! |
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eddyx11 LifeTime Member
Joined: 13 Sep 2007 Posts: 305 Location: Aberdeenshire, Scotland.
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Posted: Sun Mar 11, 2012 19:40 Post subject: |
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Descending a steep hill. Like using engine braking. |
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Walt *******
Age: 54 Zodiac: Joined: 01 May 2010 Posts: 2647 Location: Australia
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Posted: Sun Mar 11, 2012 19:50 Post subject: |
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eddyx11 wrote: |
Descending a steep hill. Like using engine braking. |
also use L when you use 4LLC going through rocky and rough surfaces |
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cc101 *
Joined: 19 Feb 2012 Posts: 19 Location: South Wales
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Posted: Sun Mar 11, 2012 19:54 Post subject: |
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Cheers, I spoke to someone the other day and they said only use L if you want to do a burnout |
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rich r ********
Age: 50 Zodiac: Joined: 11 Sep 2009 Posts: 5332 Location: Selby, North Yorkshire
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Posted: Sun Mar 11, 2012 20:17 Post subject: |
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Descending hills is the main use of the lower gears- you want the engine to be doing the braking, as if you're having to rely on the brakes, you risk locking one or more wheels - and a wheel that's not turning is no use to you in terms of controlling which way you're going and at what speed.
If you're not used to automatic gearboxes, it works like this:
D with OD on - will use 1st, 2nd, 3rd or overdrive as required. (think of overdrive as 4th gear)
D with OD off - will use 1st, 2nd or 3rd. Use when on road doing 50mph+ and needing more revs to go up or down a steep hill.
2 - will use 1st or 2nd gear. Use on or off road to descend or ascend steep hills that aren't too rough (so you can go about 15mph or so)
L - will only use 1st gear. Use generally off road to descend or ascend steep with as much control as possible. Eg when there are big rocks, ruts, etc.
And on the transfer box:
2H - use on road or off road on surfaces with plenty of grip.
4H - use on road or off road on surfaces with less grip, but not much chance of wheelspin.
4Hlc - use off road only, on surfaces where you may lose traction easily (slippery, or uneven so you might have a wheel in the air)
4Llc - use off road only, on surfaces where you may lose traction easily and need to go slowly and with as much control as possible - eg going up or down steep hills which you need to pick your route carefully. It'll roll along nicely at walking pace down a hill in this setting, leaving you to concentrate on steering the best route. |
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cc101 *
Joined: 19 Feb 2012 Posts: 19 Location: South Wales
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Posted: Sun Mar 11, 2012 20:22 Post subject: |
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Thanks, that's m ade it very easy to understand. |
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mark dale Site Admin
Age: 55 Zodiac: Joined: 04 Mar 2003 Posts: 5059 Location: Settle, Yorkshire Dales
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Posted: Mon Mar 12, 2012 0:51 Post subject: |
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Great reply Rich ... because of this I've stickied this post so it can easily be referred back to
cheers
Mark " use the gears not the brakes " Dale |
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rich r ********
Age: 50 Zodiac: Joined: 11 Sep 2009 Posts: 5332 Location: Selby, North Yorkshire
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Posted: Mon Mar 12, 2012 9:26 Post subject: |
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Thanks Mark. |
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Marse Newbie
Age: 44 Zodiac: Joined: 25 Sep 2010 Posts: 9 Location: Southampton, UK
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Posted: Sat Nov 24, 2012 21:57 Post subject: |
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You are sure is not 4th gear? It is AT JM600? On service manual is presented like 4th gear, not 3. Or maybe I'm wrong? Thanks! |
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Richy85 *****
Joined: 03 Dec 2012 Posts: 666 Location: Norfolk
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Posted: Mon Dec 24, 2012 12:18 Post subject: |
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can you switch from D to 2 whilst in motion or do you have to stop? |
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rich r ********
Age: 50 Zodiac: Joined: 11 Sep 2009 Posts: 5332 Location: Selby, North Yorkshire
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Posted: Mon Dec 24, 2012 12:38 Post subject: |
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No, you don't need to stop. All the selector does is prevent it from selecting a gear higher than 2nd (eg 3rd or OD). So as long as you're going slow enough to engage 2nd (about 40mph), you can just select it. You do need to press the button on the selector though to go into 2nd, which is a safety feature to stop you doing it at 70mph by accident.
So say you're starting to come down a big hill. You take your foot off the accelerator, but still find that you're gaining speed and having to use the brakes a lot. First thing is to turn OD off (press the little switch on the selector). That will stop it from changing up from 3rd, the revs will increase and you'll get more engine braking. But you find you're still going too fast - so now press the big button on the selector and drop it into 2nd. You'll see the revs go up again, and you'll get more engine braking. If the hill's really steep, you might need to drop to 1st.
Standard technique for descending steep hills off road is to stop and engage 4Llc at the top (so you're in low ratio and the centre diff is locked, helping spread the load and increase engine braking) then put the gearbox in 1st and take you feet off the pedals. It'll roll down the hill very slowly and you can pay attention to steering to ensure you're taking the best route to avoid loose patches of gravel or big rocks. Brake only if you have to - stopping the wheels is inviting the vehicle to slide, and if it's sliding you've got very little control over where it's going! Then when you get to the bottom, stop and switch back to 4H and D. |
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Richy85 *****
Joined: 03 Dec 2012 Posts: 666 Location: Norfolk
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Posted: Mon Dec 24, 2012 12:54 Post subject: |
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Thanks
Yeah I'm not really used to autos that much and the lack of engine breaking is pretty annoying.
Just wanted to make sure I wasn't going to make the box explode or anything |
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cal646 LifeTime Member
Age: 41 Zodiac: Joined: 17 May 2012 Posts: 398 Location: surrey
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Posted: Mon Dec 24, 2012 13:17 Post subject: |
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when i was first playing out in mine using 4hlc 4llc all super til i was going home back into 4wd then 2wd but being a noooooob to the paj and putting me fags in the dash where super select lights are i didnt see that the front wheels were still engaged lights flashing drove it home slowly on motorway as thought box had broke or more likely i had broken it made it home strong smell of oil i feared the worst but when parking reversing it unlocked 4wd and lights went out and into 2wd tho i poo a brick as i thought ive broken it already then i joined pocuk a learnt that you might need to reverse a bit an forward a bit to disengage |
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