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- เผยแพร่เมื่อ 25 ก.ย. 2024
- Does it really help to engage centre diff lock (CDL) in a constant or full-time 4wd? What are the effects of leaving CDL open off road?
We attempt to answer these questions and more visually in this 4x4 video. Although some 4wd vehicles claim to be constant 4wd or full-time 4x4 without locking the centre differential you are essentially in 1 wheel drive (unless you have axle diff locks engaged then you will have 2 wheel drive).
The "constant 4wd" only holds true while all 4 wheels have the same amount of resistance. However when a wheel looses traction and slips all drive/torque will be routed to that wheel.
We normally engage centre diff lock anytime we hit the dirt. This is somewhat similar to engaging 4x4 on part-time 4wds. It locks/splits the drive 50/50 to the front and rear axles.
Some have concerns that leaving the centre diff locked may cause binding issues. This is certainly the case on road however on the loose stuff off road it shouldn't be an issue. Off road the tyre will simply spin and through up some dirt rather than bind up the drive train.
We hope you enjoy this video and would like to hear from you in the comments as to when you engage CDL and what your experience has been. We would also love to have some feedback if you liked this type of video.
Feel free to share and smash the thumbs up if you enjoyed the video, it really means a lot to us.
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It's amazing how well these rovers climb when unlocked and theoretically one wheel drive when hung out in air. Shoes just how important good suspension travel is with good tires 👍
@DAVID FORBESLeave it out, you know what he meant.
Axle articulation is good, but transversal difflocks are more useful on loose or slippery surfaces. Also helpful inncase a wheel loses contact.
traction control and diff-lock can never beat more wheels on the ground
Just finished fitting a new power steering pump to the 300TDI disco. God I miss my Defender, even with the wet feet. Great explanation on the CDL!
PS Go the blues!
Thank you, I had never quite understood the difference between locked and unlocked until now, thanks again
Gary Findlay Your welcome mate. Thought it maybe helpful to put it visually for all of us to see the difference.
Those front and rear lockers sure did help
Nice cameraman angles and very nice video! I love Land Rover and Off Road machine 😬👍
Haha watching this video at two in the morning while fixing a Land Rover
ROVA_PIET haha thats awesome. We are always tinkering too your not alone 😂
Oh man that dog was making me nervous
Basically when you unlock the center differential it turns it into an all-wheel drive vehicle.
So this is sort of a good way to compare all-wheel drive versus typical four-wheel drive.
Thanks, really showed the advantage of CDL locked.
What suspension are you running??
This was so satisfying to watch!
Glad you enjoyed that 👍
It seems the dog is there to give moral support to open cdl ..lol
😂😂😂
Thing sounds like a tractor and I love it.
don198769 🚜💪👌
Straight open pipe bigger turbo by sounds it
Switch to a manual air lock diff lock not not the shit electronic ones on new defenders
Excellent labels. Most leave you clueless as to what is happening.
Was the front or rear lockers on ? very important thing to mention sir
Hey mate can I ask how much lift are you running and what did you have to do to make it work? Also did you have to upgrade the front diff? Great video.
Excellent video! Thanks for your time on demonstrate on this.
Your welcome 👍 Thanks for watching
So the CDL splits the drive 50/50 between front and rear wheels but what about axle differential locks, does this car have any lockers or LSD on axle diffs? It seemed like left and right wheels were turning at the same rate...
Very nice video!
yes do tell ...... thanks
open diff = 1 wheel drive , centre diff = 2 wheel drive , one exle locker = 3 wheel drive and front and read lockers = 4 wheel drive , basically
Good driving, i have the same land rover county with ATB centre diff lock and elockers front and rear,i looking forward to testing it out and seeing what it can and cant do,still got to put the auxiliary tank on and winch, one of my last upgrades. Good video work thanks.
Greg Palmer Part of the fun is modifying. I also had an aux tank under the drivers seat that i have removed but will probably reinstall at some stage. Atb in the centre diff is a great bit of kit from what i hear, you will be happy.
For those that arn't familiar with what a ATB centre diff lock is i have posted a link to help you with that. www.ashcroft-transmissions.co.uk/diy-rebuild-kits/lt230-rebuild-kits/ashcroft-lt230-atb-diff.html
10pm here blowing the froth of a couple while working on my 130
I don't think there is an unmodded 4x4 in existence that could deal with that kind of climbing. That looked severe!
I get the diff lock part
Now what enables wheels to 'have rickets' to suit terrain surface.
What's the name of the property/Characteristic that enables it
4.21 black dogs, super assistance Def!!!
Gooood, dogs!
Do you have a video where you show the effects of locking/unlocking of the differentiels, rear and front on your Land Rover's? Or do you have antislippering system? Because I don't see much of spinning wheels!
Luke AtThat no i dont but thats something i could do in the future. Generally i run unlocked until there is an obstacle that i anticipate to have trouble on and activate the axle diff locks. I find that less stressful on driveline components than using momentum or have a wheel spinning and all of a sudden grab traction.
Maybe the 50/50 term is confusing, it is just another locking front-rear axle so it will force both ends of the axle to run at the same speed, great video
Same same i guess. Thanks for putting it in a different way 😊👍
Très belle démonstration, bravo!!!!
Question. I have part time 4wd and also a center diff lock. Pls help explain.
your description is in accurate. it is front and rear wheel driven even if dif open. you need to look up torsen centre differential operation. torsen center diff is not a traditional (open) differential, therefore doesnt behave as you wrote.
There is no torsen diff here what so ever. Not sure what makes you think it has a torque biasing centre dif.
Thanks for this video. I have a question, how does this all work when the Landy has the traction control option? Should that be on or off based on this situation?
This particular version does not have traction control, too old. However it would still be the same, because it is the transfer case that will dictate where the torque goes before traction control has time to do it's job. Hope that kind of makes sense.
Ciao che molle e ammortizzatori monta il mezzo ?che altezza
Good driving but no chance that is only CDL must be rear and front! In this case CDL is not enough!
American Powerlifter it’s all the older rovers came with no t/c just cdl
@@MrNeild123 yeah thats not what he is saying
Exactly. I'm suspecting he has all the 3 lockers
Really a good review !!
Clear and professional !!
Thank you for the feedback 👍
Even with the CDL locked it's still gonna have front and rear differentials open, right? So if you have the driver front tyre and passenger rear tyre in the air it's still gonna get stuck. And to get unstuck you're gonna need to lock either the front or rear differentials. Is that how the CDL works or am I still wrong
Yes you are correct. If you are cross axled CDL wont help but without CDL engaged just 1 wheel in the air is enough to stop forward movement.
Hi, Nice 4x4. I would suggest that you put a roll cage in the Defender, they are not the strongest when they roll.
Geraint Jones That is something to consider
Great video. Do you lock the diff when driving on sand?
Yes most definitely lock cdl on sand.
It would have been a lot easier if they just put a standard t case in. 2wd/4wd. Less chance of the center diff lock blowing out or becoming worn. This way also you could run a auto locker in the front and rear and still be able to steer by having a t case that will disengage the front axle allowing the auto locker free to differentiate wheel speeds during turning. It would be absolutely impossible to turn with a auto locker in both front and rear with full time all wheel drive. Of course there is a easy way around that but not a cheap one by going air locker or E locker. But it's more to tear up with having to deal with air lines and compressor or a wiring harness to get chaffed or ripped apart while wheeling. Do you have a E locker in the front or air ?
Yes everything has pro's and cons. The road handling and speed work characteristics would be very different (probably worse) if they went to a part time 4wd system.
Im running air locker in the front.
When should I lock my CDL?
So, here is what i understand.. even if u have a part-time 4x4 car, and select 4H or 4L, rear wheels and fron wheel will spin at a different speed. But if u select 4H or 4L, and lock the CDL, the power from engine will go 50/50 between rear and front axle. It's right? Because i saw part-time 4x4 vehicle that don't have CDL. In that case, when you select 4H or 4L, rear tires and front tires will spin with different speed. Right? Correct me if im wrong. Thank you.
Only full time 4wd's have a centre diff lock which works as you said. Part time 4wd's have a transfer case that allows 2wd or 4wd so when they select either 4h or 4low it splits 50/50 front and rear.
@@lror thank you
@@lror but what about the mitsubishi pajero mk2 2.5 td super select? They have a transfer case, or a CDL? Because on the shifter you have nex features: 2H, 4H, 4H LOCK, and 4L Lock.
Nice video and explanation! But few more questions)
If I turn 4l gear on my montero xls with a regular part time and no central differencial, it means my front and back wheels will spin with one and the same speed ? Just like a full time 4wd with central differential turned on ?
Yes and yes
I don't speak English, but in my opinion you forgot to talk about the front and rear differentials, which I think you have blocked. In the video you have blocked the center with the front and rear.
Hi guys what suspension set up do you have please .springs shocks ..thankyou ..
SOUND LIKE DIESEL 300DTI? NEW LAND ROVER
THANK YOU FOR YOUR GREAT VIDEO.
Thanks Robert. How have you been, long time mate.
What size wheels and tires on the Green Defender???
Do you have axle locks in addition to the center diff lock, or are the axle locks in opened?
It has axle locks but they were used in both scenarios just the same.
While I think this is a great demonstration and I never get tired of watching your 110 flex you have to be careful with your technical explanation. Torque doesn't go to the wheel with least resistance, power does. Any spider gear differential will bias torque 1:1 or better, meaning that even if you only see one axle set spinning it doesn't mean the other axle set is not getting any torque or that the spinning axle has more torque, in actual fact both axles are getting exactly the amount of torque required to break traction on the wheel with the least. i.e. if one tire can only handle 50 nm before tire slip then you know that all the other tires are getting exactly 50 nm each, its just that 150 nm (50 x 3) isn't going to be enough to move you forward and so you stay put and spin a wheel. The power is only going to one wheel since power is torque times a rate and since the other wheels aren't moving there is no power (though there is torque).
Now if gets a little fuzzier if the differential doesn't have spider gears like a pure viscous coupler but in those cases the maximum torque bias is usually greater than 1:1. In most permanent 4wd systems these days you get 2 or 3 systems instead of just one; Either a spider geared center with locking collar, or a spider geared center and a limited slip device like a viscous coupler, or a torsen center differential and in many cases you get all 3 like my 80 series land cruiser with a spider center with a viscous coupler and a locking collar.
the moral of the story is the same though - if you have a center lock, use it for "true 4WD", and if you don't have one you should get one.
Sidenote: The original HMMWV like in the background on one of the climbs had a neat trick where its front and rear differentials were high bias torsens and because the hubs were gear reduced portals you could "lock" the diff with light brake pressure as the tiny amount of resistance from the brake was multiplied by the bias ratio (4:1) and then by the gear hub (1.8:1) so if you provided 100 nm brake force to both wheels the wheel without traction would get over 700 nm of torque biased to it. It was shockingly effective. check it out here
th-cam.com/video/J2uIlfqRkyQ/w-d-xo.htmlm59s
Patrick Rich Thanks for doing a write up and adding more information. Its difficult to encapsulate all of that in a few cards at the beginning of the video.
LROR thanks. you did the tricky bit with the demonstration. Looking good out there
@Ian Mangham engineering explained ring a bell?
I love the sound of it.
That's a weapon of a truck, does it have front or rear lockers as well and are they engaged in the video?
Thanks mate, yes its twin locked and they were engaged on some obstacles in both scenarios. Check out tonights video to watch it's first run on 37 inch Treps 👍
the difference btw the deffender and others is the others are suvs but the deffender is an off road rig
I really would like to know which spring do you use in this video. Brand and feature
Thanks
Those springs look like Dobinsons (based on the colour)
Wow great video sir
Which engine? How much power?
Impressive
Excelente video señores...gracias por compartir...saludos desde culiacan mex...
Great demonstration, love your work 👍
Michael Toomer Thanks a lot man 👍
Great demo and drive cobba. Silly question, but what is ' ATB centre diff lock'? How does it/is it different to the standard 'CDL' fitted....1995 Disco in question lol. Cheers, Brett
Reaper4367 thanks matee 👍
An atb is a torque biasing diff similar to a limited slip diff. Its good for high speed work and sections of loose and high traction surfaces that demand you to lock and unlock the centre diff continually. Here is a good write up from ashcroft transmissions www.ashcroft-transmissions.co.uk/diy-rebuild-kits/lt230-rebuild-kits/ashcroft-lt230-atb-diff.html
@@lror Cheers for that. I pick up my first Áshcroft'for the rear on tuesday! :). I'll do the CDL ATB a little later on. Cheers for the link and answers!. Hope to see you around the tracks some day! Hooroo for now. Brett.
Great demo
Excellent video and explanation, thank you. What brand springs are in the 110?
Peter Dobinsons custom rate progressive coils
My 80 series has this centre diff locker , would I still need a rear or front locker for moderate offrad condition , deeper sand etc... thanks in advance
Yes you would
Thanks !!
Are you ever planning on doing tutorial or walk-around video on your rover
jofher007 its definitely on the cards.
The spring look like got a lot of flexibility may I know what brand is that?
They are Dobinsons progressive rate coils.
@@lror Thanks for your reply
Wondering between Defender and Landcruiser which is the best
Hard to say, each have strengths and weaknesses over each other.
Does Defender have just Centre Lock or does it have also for front and rear diff?
@ben walker thanks for the answer
ben walker do you really believe, that brake action can drive your car?
Really is a big difference. I only lock the centre diff when i get undone. Might have to think about locking it early on after watching this. Any issues with binding?
Glen Davis yes i was surprised at how much difference it makes. We havent had any binding issues and we all lock as soon as we hit the dirt. Although that will be a problem on high traction surfaces.
Yes it must be found which it is.
If it becomes a bad path
Then it will become an all out fight to travel along it
Using all tools available to keep going many vehicles will suffer catastrophic damage from evil obstacles in the way.
Sometimes we have to trust our gut,
Not someone else's plan!
Stay strong.
Nice work. The sound of the engine is amazing. What engine does it have?
4bd1t
That is an awesome County. I love seeing it in these vids. Clearly it's no longer a V8, but it doesn't sound like a TDi, so is it an Isuzu? Also, is it cross locked?
Maybe it's an early TDi like the 200tdi which is very noisy but it's the strongest and longest land rover engine ever made ...
2.8 TGV?
Wow...great video! BTW, do you use the auto transmission for this particular 110?
Thanks man, it's still a manual 4spd lt95 😎
Do you use something like adapter to combine the diesel engine with LT95 transmission?
Beautiful driving
Simon Jackson Thanks mate 🍻
great video Sir!
Good driving, very controlled.
Thank you 👍
which is better Center locking or Rear locking
Center diff lock is how full time 4wd vehicles get into true 4wd. Otherwise whichever of the 4 wheels looses traction gets all the torque. So in a full time 4wd vehicle center diff is more important. On part time 4wd they dont need a center diff.
@fukthegoog part time 4wd does not have a centre diff, therefore no centre diff lock. However your button engages the front output in the transfercase giving you 4wd. And as such you cant use 4wd in your vehicle on pavement or high traction surfaces without creating wind up problems.
Excellent video!
Thanks man 🍻
Great video.
I drive an auto 80 series and it’s full time 4x4 and when I put it into low range it engauges the centre diff lock to split the drive 50/50 but I still get a lot of open diff action but it seems like this truck just walks up everything even with one wheel in the guard and one dropped down, I suppose you probably have a rear locker in the rear though
Is it manual or automatic transmission in landy?
Its a manual buddy
Great demonstration. Very nice video. I love to watch your productions. It inspires my driving when I try to imitate it on my scale rock crawler Defender TRX4! I can remotely open or lock the rear and front diff (unique feature from the maker) but not the Center Diff. It is always locked on the RC crawlers. Perhaps one day it will be possible to switch it also.
Luke AtThat Thank you. I wish i had portals like the trx4 😉
Check out our rc channel Aussie RC Crawlers. I havent posted in a while but you might like it. th-cam.com/channels/SoR6Shh40OKNf6lIwSj7Bw.html
I visited your channel already. Nice videos! I in fact just suscribed! I want to encourage you to do your Large scale video LROR channel as much as your 1:10 scale videos!
My channel is Luke AtThat, th-cam.com/channels/DAuSJzUG8tKDYhzU3DPlZg.html
you will find RC crawling with my Rubicon SCX10, my HO train Layout and soon videos of my TRX4 still to be edited... lol
I really love your True scale video! Really well done and challenging! Congratulations again!
Luke AtThat Thank you and i will do more scale stuff but time sometimes dictates. Just subbed to your channel and look forward to watching.
Very good video.
Thanks man 🍻👍
Are these trucks full manual?
Yes manual
👍👍👍 good video.
Very good video!!!!
Thank you for watching 👍
Bonjour.
Ce n’est pas un moteur V8 mais un 4 cylindres turbo diesel…
Stage 1,s are awesome
Sighs makes me love my defender even moreee
Nice flex
Should one block the CDL on sand?
Bravo!
Nice video...
tyres 33 or 35?
rigs offrods 35s
this vehicle is not representative of how the majority of "full time fwd", aka AWD, vehicles work, as your car has no traction control or abs.
abs and traction control work together in a standard AWD, individually engaging the brakes on any wheels that start spinning, thereby redirecting power to the other wheels.
some AWDs do this better than others, but to say that a pure open diff is normal is a bit misleading. only the really old cars have straight open diffs with no traction management.
and then theres the forrester, with its LSD, quite a capable "AWD"
nice climb btw and good presentation
You can really talk too that 110
Great driving
Border Terrier man 🍻
You can clearly see each whelk spinning at different speeds not diff lockers here kids
i actually thought i heard one ratcheting as the torque increased.
in any case, theres certainly no abs or traction control :/
Thats how its done 🤤😍😎💪👍👌
Man i love my Mahindra Pik Up... but i want a 110 so bad now lol...
That must be twin locked aswell
CUMMINSANDSCANIAV8 yes she is
good video but HOLY SHIT that intro music was loud.
I wish toyota 4runners had a diesel manual option lol
They do. It's called a hilux surf
patta
Ohhhhhhhhh
Front to rear locking engagement vs left to right engagement!!! Your overall bias is just a variable affected by which ends (front or rear) rate of slip and that individual axles locking rate potential
V8 TDI?👍🏻😂
Анатолий Поправка 😂😂 you noticed
I’m was wondering the same. Sounds like a diesel but got that V8 in he side. I’m guessing that’s the taking the piss right!?
Once upon a time she was a v8
LROR ahhh the mystery is now solved
3.9 isuzu 4db1t
I can really hear the water in my ear