| Author |
Message |
    
Mitch
| | Posted on Monday, July 08, 2002 - 01:11 pm: | 
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I have recently seen a lot of postings for adding CDL's on disco II's. I was wondering what is the difference between a CDL install and using ARB air lockers. I am fairly new to the world of Rovers and their mods, so go easy on my ignorance. I am looking for a clarification.
Thanks in advance,
Mitch |
Craig Kobayashi (Koby)
| | Posted on Monday, July 08, 2002 - 01:30 pm: |
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Mitch-
There are three differentials on any Disco: Front, center and rear.
Front and rear are found in in between the axle shafts on the front and rear axles, respectively, and the center is found at the transfer case.
The Disco1 comes equipped with a CDL mechanism stock. the Disco2s until 2003 did not have this as an option.
Locking the center differential locks the driveshafts to the front and rear axles together,so that front and rear axles spin at an equal speed, with power divided equally to front and rear driveshafts.
http://www.discoweb.org/discovery/basics.htm
Front and rear lockers will lock the right and left wheels together so that when one wheel loses traction, it won't spin, robbing the wheel with traction of all power. the lock again distributes power equally to each wheel.
The short of it that installing a CDL mechanism is merely adding a mechanism to activate a feature that already exists on MOST Disco2s, while adding ARB lockers front and rear is a bit more involved, which I won't go into here.
http://www.expeditionexchange.com/arb/ |
Al Oliveira (Offroaddisco)
| | Posted on Monday, July 08, 2002 - 01:32 pm: |
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The CDL is like an airlocker but in the center differential and it's activated by mechanical or electrical means. The CDL is betweek front and rear axles. It allows power to go evenly to both front and rear axles. The Air locker is mounted on either the rear axle or both front and rear axles. And makes power go to both wheels on that axle when it's engaged. Without the CDL the air locker is almost useless since all the power will just go to the other axle. |
Blue (Bluegill)
| | Posted on Monday, July 08, 2002 - 01:33 pm: |
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hey Mitch, no problemo.
DII's don't have the CDL, or center differential locker, like the DI's have. This locks the transfer case (the center differential) so that 50% of the drive goes to the front axle and 50% goes to the rear axle. When you're unlocked (like you always are on a DII), more than 50% of the drive can go to either the front or rear axle. This is good for normal driving, but offroad that usually leads to loss of traction. If the front wheels lose traction, then more and more power will be allowed to go to those spinning front wheels. A CDL would keep at least 50% of that drive with the rear axle.
A "locker" or locked axle differential, enables the axle diff to send all the drive to the wheel with traction. Logic is the same as the CDL; if you're unlocked, all that drive will escape via the path of least resistance, a.k.a. the spinning wheel(s). |
Al Oliveira (Offroaddisco)
| | Posted on Monday, July 08, 2002 - 01:44 pm: |
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Actually D2's (1999-2000 and some 2001) do have the CDL. Just not the linkage so it's an easy upgrade. The 2001-2002 D2's would need an entire transfercase to give you a CDL since those don't have the at all. |
Blue (Bluegill)
| | Posted on Monday, July 08, 2002 - 02:09 pm: |
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Ok, so they have unlockable center diff lock 
unless, of course, you get busy like Craig or Greg.  |
Greg Davis
| | Posted on Monday, July 08, 2002 - 02:49 pm: |
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Mitch, start with the CDL. Without that, if your front axle starts spinning (whether locked or not), it will get all of the power since the center diff is open. Therefore, the rear axle (whether locker or not) will get less of the torque, rendering your locked axle useless.
Now some will say that ETC will overcome this. In theory it would, but in reality it simply applies the brakes to the spinning wheels. It's just not efficient enough to work as well as having a locked center diff. |
Craig Kobayashi (Koby)
| | Posted on Monday, July 08, 2002 - 02:57 pm: |
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Mitch-
If I remember right, you have a 2002, right?
If so, CDL is probably going to be difficult for you to pull off. |
Mitch
| | Posted on Monday, July 08, 2002 - 04:45 pm: |
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Koby,
I have a 2000 so acording to what I have read it shouldn't be as difficult as a 2002. |
Al Oliveira (Offroaddisco)
| | Posted on Monday, July 08, 2002 - 05:14 pm: |
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Mitch, The CDL upgrade has been the single best upgrade I've made to my D2. If you haven't done it yet but are thinking about it RUN don't walk to your bank and get the money and do the upgrade. The CDL with ETC works wonders. I have no idea what LR was smoking in their glass pipe when they decided not to make the CDL standard. |
Kim S (Roverine)
| | Posted on Monday, July 08, 2002 - 10:07 pm: |
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At times, I don't know why I torture myself reading this stuff, LOL ... I finally got D1 linkage for the CDL, but Greg (DH, not Greg above) doesn't really have the resources or time for any major mechanical work (he will be traveling quite a bit more internationally again. Arrgghh!). I had finally come to the conclusion that we were being delusional about Greg doing any major mechanical work this summer. Then I figured, it's certainly worth the cost to pay a good mechanic for the install ... I have driven with my CDL both locked and unlocked, Greg D. (above) is right, what a difference! Anyway, my hubby Greg's (DH = Dear Husband, BTW)car recently took a major dump ... Older sedan - out of warranty, of course. So. There went all of the modification and install money for awhile. Waaahhhhhhh .... Oh well. Could have been worse. I have much to be grateful for.
Kim 
'01 DSII
I'm getting a grip and telling myself to "shuddup" now ... |
chu
| | Posted on Tuesday, July 09, 2002 - 02:22 pm: |
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Kim,
I don't know if this will make you feel any better, but I recently acquired 2 disco 1 CDL levers and need to find time to install both of them.
Just keep in mind, if I can install this thing in less than 10 hours, it should be a piece of cake. I'll let you know how it goes.
chu |
Craig Kobayashi (Koby)
| | Posted on Tuesday, July 09, 2002 - 04:23 pm: |
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Chu and Kim-
The key is having the right tools and ALL the right parts.
If you've got the right tools, it's really only a 4-5 hour job. The instructions at EE are excellent, and pretty thorough.
Several people offered their support to me during my installation, and I will do the same for you guys. If you have ANY questions, I'm always accessable by e-mail or by Yahoo Messenger. E-mail me off board and I'll give you my cell phone number too. |
Kim S (Roverine)
| | Posted on Wednesday, July 10, 2002 - 12:53 pm: |
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Chu and Craig,
Thanks,
Kim
Good Rover Karma - "Pay it forward" (I'll do the same) |
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