Lack of drive

[Familyd2fun]

Hi all unsure if this is the correct area to post but here goes loving the 99 d2 i got brilliant on road and other than trying to recover someone never been stuck but still testing and not pushing too hard yet.
Wondering if someone can educate me on the way the drive in these cars work and wether or not mine is ok?
On one hill i had my right wheel keep spinning no drive on the left. And the rear spinning one the right but not the left this was with tc working(supposedly) and in low range. Another time i did a burnout trying to climb a bank however 3 amigos were on so i think tc was redundent.
Today on a muddy climb with cdl on and in low tc off i had drive in 3 wheels front right spinning alot lol but front left doing nothing. Cdl off and tv working i had some wheel spin booted it i had alot of grip in the back and wheel stood out of the ditch so tc scary!!
Also while tied to a vehicle trying to pull him i kept doing burnouts with the front pair but not actually getting anywhere this was just low range with tc working does this sound right i seem to have limited drive to me? Cheers

[isuzutoo-eh]

When traction is not very good, often you will find that one or both wheels across an axle will slip. This is normal.
Sometimes you can have three wheels slipping. This is normal.
All four wheels slipping-normal.
One wheel slipping and no forward progress? That's a good sign that the centre diff has not been locked.
To get an understanding of how diffs work, have a look at this recent thread:
http://www.aulro.com/afvb/technical-chatter/175964-how-differential-works-old-school.html

Traction control, to a point, will help to limit the wheel spin and as a result force the wheel with traction to turn and hence you'll get forward progress. But traction control isn't perfect, it won't perform miracles. Particularly so if only one wheel has any traction and the other three are spinning.

Be careful with putting the boot into it when the centre diff is unlocked off road, the centre diff is only about the size of a fist, whereas an axle diff is the size of your head, the axle diffs can cope with a lot more power and differential action than the tiny centre diff. Lock it, as that is when it is strongest.

[Familyd2fun]

Thanks for the quick reply will read that shortly i was under the impression i would have atleast some spin from the opposing wheel thats spinning locked or unlocked? I have found i get to a point starts spinning 1 or more wheels and lose drive altogether then bang away i go lol or i have to get a run up.

This being said i did out do a hilux today by just chugging up a big hill in comparison to his top speed approach the landy does perform well. Thanks again

[spudboy]

I don't know so much about Disco's but for a while some of them came out missing the Centre Diff Lock (relied on TC). Is yours one of these? I only ask, as you didn't mention that you locked the centre diff.....

Haha - I'm going to have to retract that!! You did have CDL on!!

[bob10]

On facelift 2003 Discovery 2's the SLABS ECU was re-programmed to ignore diff lock input, and therefore does not disable the ABS,TC, & HDC when the diff lock is engaged and the car is started. On earlier models, you have to engage CDL after starting, to have those capabilities available. At least that's how it works for me, and I must stress I'm not an expert. I have been slowly testing myself on the clay tracks in the Glasshouse Mt. area, and to a lesser extent on sand at Bribie Island, [admittedly only the short track onto the beach, and parts of the track to the passage side give some soft sand driving, the beach is like a bitumen road] So far, in spite of my inexperience, the D2 has simply motored on. The Glasshouse area , after rain, & after the track has been heavily rutted by 4WD enthusiasts, can be interesting. :) Bob

[Familyd2fun]

Im wondering if this will be easier to understand lol i had cdl locked in low first and my front right was spinning and my next attempt front left spun with the cdl shouldnt the rear have drive to "push" me up or atleast spin? Or does it work differently? Sorry to be a pain cheers

[d2dave]

Im wondering if this will be easier to understand lol i had cdl locked in low first and my front right was spinning and my next attempt front left spun with the cdl shouldnt the rear have drive to "push" me up or atleast spin? Or does it work differently? Sorry to be a pain cheers

Yes this is correct. If centre diff is locked you must have drive to front and rear. Sounds like you have a problem that the centre diff is not locking.

Does the light on the dash that tells that centre diff is engaged come on?

Another way to test. Put vehicle in neutral, handbrake off, CD unlocked. Jack up one front wheel. You should be able to spin this wheel. Now lock the CD. Wheel should not be able to be spun.

[Bushie]

This may encourage all to lock the centre diff when off road.

https://www.youtube.com/watch?v=vFHCYuPTbfg


Martyn

[bob10]

Im wondering if this will be easier to understand lol i had cdl locked in low first and my front right was spinning and my next attempt front left spun with the cdl shouldnt the rear have drive to "push" me up or atleast spin? Or does it work differently? Sorry to be a pain cheers

Mate, we are all on a learning curve [ most of us, anyway] I thought I had this CDL caper worked out, but now I'm not sure. I can only suggest you go to THE GOOD OIL, scroll down to Pedro's excellent sticky " the D2 CDL" and read Urban Panzers description of its operation, a good place to start. I'll be reading it again, myself. Never consider it a pain to ask questions, we don't learn if we don't. Bob

[Familyd2fun]

Thanks bob was a good read and dave i will try the front wheel tomorrow. Just purchased a series 1 lever for in cab cdl control $20 :)

If cdl is unlocked and low range is used and only the front wheels spin and there is plenty of traction but lack of drive with the rear is there a way to check drive of the back wheels? I did a burnout with the back left off road the other day but there is a limited drive there starting to get a lil worried now. Cheers

[d2dave]

Thanks bob was a good read and dave i will try the front wheel tomorrow.

It can be a front or rear, makes no difference. I don't know what made me say front.