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diff lock and all that technical Jargon :-)


 
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london mc
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Joined: 15 Apr 2004
Posts: 29

PostPosted: Fri May 07, 2004 13:36    Post subject: diff lock and all that technical Jargon :-) Reply with quote

Ok, just to spice things up...

i recently picked up a 4.2VX M reg. bought it cos I thought it looked nice Smile and it has loads of space in the back (do some mountain biking so this is ideal)..I also need to carry 8 sometimes, so the VX is ideal.

I have no idea how the 4 wheel drive stuff operates and was looking for an idiots guide to all the options.

so starting with the basics:

First, car is automatic, has a 3 or 4 speed box. when do you use 2, 1 or L ?

Second, difference between high and low on the smaller gearshgift on the tunnel. I'm guessing this is a simple ration thing..but when do you use Low as opposed to High ?

Third, the diff lock options..what does this all mean..when would i use the diff lock, what does it do, and what do the positions on the dial mean ?

finally, any other 4wd advice for a complete newbie much appreciated..don't want to break it now do I ?

Mc
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PostPosted: Fri May 07, 2004 13:36    Post subject: Google Ads keep this community free to join!


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The Proff
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Joined: 15 Sep 2003
Posts: 28
Location: Bolton

PostPosted: Mon May 17, 2004 10:34    Post subject: 4x4 Basics Reply with quote

Here goes - hope I get everything right! Though I'm sure that the other members will correct any of my errors.

First, 2, 1, L. Mine has 2 and L on the main gearshift. 2 locks the drive into 2nd or first, but the transmission will change between the two gears itself. Treat it as 'not more than 2nd'. L locks the drive in first.

I've not found any official advice for using these, but I use them in two situations:
1. Engine braking - going downhill around 30 mph or less, change to 2 for engine braking. PS - if you have a small button at the top of the gearshift, this switches off overdrive - can also be used for engine braking at higher speeds.
2. Selecting a lower gear when the transmission is slow in reacting. Eg there is a turn near home that is a sharp bend and a short climb. I slow down and pre-select 2, because I know I'm going to need it. Once up the climb, I change back to D and let it do it's own thing.

H and L shift - High range for road use, low range for off-road and bad conditions - ie snow! Only use Low when off tarmac (advice from Driver's Manual). Warning - Low ratio drinks fuel - make sure you've got a full tank! 3 hours off road nearly drained mine.

A two-wheel drive car has one differential between the driven wheels, since, when turning, one wheel goes faster than the other. When a 4wd turns, the outside wheels go faster than the inner, and because the front and rear go round a different radius, both axles turn at different speeds. So you have 3 differentials!

If you use Low ratio, it locks the centre diff between the axles - front and rear drive run at the same speed. You will find the car won't turn as easily. On tarmac, you risk building up tension in the transmission and breaking it. Good for getting out of sticky situations on grass though!

The diff-lock switch on mine gives the option of Rear diff lock, or Front and Rear diff lock (if I've got it the right way round!). Only works in Low ratio. Warning - even greater risk of winding up the transmission! After use, change back to high ratio and turn, to release tension.

Use Rear diff lock for very slippery conditions, eg when one rear wheel spins, or if one rear wheel is lifted off the ground. Both wheels turn at the same speed.

Use both diff locks in VERY slippery conditions - or when a front wheel and the opposite rear wheel are off the ground. All wheels go at the same speed. With all diffs locked, the car's turning circle is huge!

Hope this helps!

Dave
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The Proff
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Joined: 15 Sep 2003
Posts: 28
Location: Bolton

PostPosted: Mon May 17, 2004 10:37    Post subject: More buttons! Reply with quote

If you have two buttons the other side of the H - L shift, these are probably marked PWR and 2ND.

2ND locks the drive in 2nd gear, for starting in 2nd on snow. PWR lets the revs get higher before each change takes place - a sports setting ??!!

Dave
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