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billrand

Active Member
ok over the years ive asked a few questions about this im sort of looking for the definative answer lol

2001 disco2, used for work on farms, therefore mud

came fitted with cdl but no lever

rigged up a way to engage it with a simple socket flex extension etc

i know about the engaging it with ignition on/off etc

the biggest question i have is, has anyone who has done this actually experienced damage to the transmition when the cdl and tc are engaged together?

the argument goes that they will be fighting against each other

i do have a used upgraded later slab, but it looks like a bit of a pain to fit, plus some say it needs reprograming as well to the new vehicle

thoughts? :) cheers
 
billrand said:
the biggest question i have is, has anyone who has done this actually experienced damage to the transmition when the cdl and tc are engaged together?
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As long as you didnt cut the cdl input wire to the slabs like some smart guys say you should nothing bad can happen cos the TC will be inghibited to not work against the locked diff with the early ECU..

as about
billrand said:
... plus some say it needs reprograming as well to the new vehicle...
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i have no other comment though i'd like to see the arguments of some who say it doesnt need programming :vb-headbang:
 
billrand said:
the biggest question i have is, has anyone who has done this actually experienced damage to the transmition when the cdl and tc are engaged together?

the argument goes that they will be fighting against each other
Click to expand...

First I should say I don’t own or know discos.

But I would say that CDL locks the front and back propshafts together but you still have open diffs in the axles.
If you spin a wheel on each axle at the same time you are stuck.
TC acts on a spinning wheel so that drive can go to the other wheel.

I don’t see how this could damage transmission?

J
 
marjon said:
First I should say I don’t own or know discos.
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marjon said:
TC acts on a spinning wheel so that drive can go to the other wheel.
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then you should learn first how these things work cos TC acts in axle pairs too not just on one wheel so if the props are locked while for example a rear left and a front right whell are spinning the TC would try to equalise on each axle first then on both but the locked props will force things against that... that's just a very rough explanation cos things are much more complicated
marjon said:
I don’t see how this could damage transmission?
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i doubt it could damage transmission but there are certain scenarios when the vehicle can lose traction rather than gain more
 
sierrafery said:
then you should learn first how these things work cos TC acts in axle pairs too not just on one wheel so if the props are locked while for example a rear left and a front right whell are spinning the TC would try to equalise on each axle first then on both but the locked props will force things against that... that's just a very rough explanation cos things are much more complicated

i doubt it could damage transmission but there are certain scenarios when the vehicle can lose traction rather than gain more
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Which is why I like to learn.
So a disco TC doesn’t act on a wheel, but both on an axle with the spinning wheel?

J
 
marjon said:
So a disco TC doesn’t act on a wheel, but both on an axle with the spinning wheel?
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it acts in a well engineered manner on wheels and axles which is more complicated than the simple description from the WSM and i know that based on many live tests in field and dyno platform with live data readings , the gist is that the better solution is to have the uprated ECU fitted if the vehicle has the early modell or let it work as it was set from factory not cut the CDL input wire like in some tutorials
1753301317669.png
 
billrand said:
and does it need programming?
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From memory it's just the suspension needs setting - to ensure it's set to air or coils (as appropriate) and if on air it needs to have the heights set correctly.
There may be more than that, it's been years since I did it.

Depending on where you are though you can probably find someone with a Nanocom to do it for a few beer tokens.
 
ok well ive no way of replrograming the later slab
so i guess i will just have to run the truck as it is and hope the cdl and tc play nice together lol
 
Just lock the diff before you start the engine as the ABS/TC lights to be on then the TC will not work against the CDL...provided that the wire i mentioned was not cut
 
sierrafery said:
Just lock the diff before you start the engine as the ABS/TC lights to be on then the TC will not work against the CDL...provided that the wire i mentioned was not cut
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i get that but the whole point of me fitting the cdl linkage was to be able to use them both together as by all reports saying that it improves the off road ability :)
 
billrand said:
i get that but the whole point of me fitting the cdl linkage was to be able to use them both together as by all reports saying that it improves the off road ability :)
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It does only with the new SLABS... with early ECU if the CDL input wire was cut there are scenarios when you can lose traction for good and overheat the brakes... you can borrow nanocom for a week on ebay if you can't find somebody to help
 
sierrafery said:
It does only with the new SLABS... with early ECU if the CDL input wire was cut there are scenarios when you can lose traction for good and overheat the brakes... you can borrow nanocom for a week on ebay if you can't find somebody to help
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well i certainly wasnt going to cut the wire :) , i need to know when the cdl is engaged with the light lol
 
billrand said:
well i certainly wasnt going to cut the wire :) , i need to know when the cdl is engaged with the light lol
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The TC warning light has nothing to do with the wire i mentioned, not affected, cutting that wire the ECU will not "know" that the diff is locked and the TC can come in conflict with the locked diff in some cases that's all, while the newer ECU is conceived as the CDL and TC to work together
 
i was hoping to hear from lots of people that they had connected the cdl and used it with the tc and never had a problem lol,,, there must be quiet a few done it
 
If some people didnt have problems means that they were lucky to not get into the worst scenario, if you lock the diff while the engine is running the TC will work normally then if you get stuck turn ignition off then on as the lights to come on and the TC disabled... though even if you'll have traction with active TC the breaks can overheat with locked diff
 
sierrafery said:
If some people didnt have problems means that they were lucky to not get into the worst scenario, if you lock the diff while the engine is running the TC will work normally then if you get stuck turn ignition off then on as the lights to come on and the TC disabled... though even if you'll have traction with active TC the breaks can overheat with locked diff
Click to expand...
ok, so the most that can happen damage wise is over heated brakes? no damage to the transmition? the truck is used in mud not rocks were a sudden jolt would occur
always apreciate your input :)
 
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