soob noob diff question

[MuslimPete]

so subarus have me a little confused when it comes to applying a LSD. correct me anywhere if im wrong.
i have an 03 baja and im not sure on its internal details
i have 3 difs. a front center and rear.
the center is a viscous applying front and rear wheel drive. i'm seeing alot of threads about cusco LSD's. i also saw the forrester video comparing the 2 LSD's. i guess what im getting at is im completely lost at the mechanics of how the factory LSD fails to keep either the front or rear driving while one wheel is off the ground. and if a cusco was applied where would you apply it to? front rear or center? and why.
thanks guys.

 

[El_Freddo]

Front and rear.

Lifting one wheel causes loss of traction on that end of drive. The power/torque of the engine to the one wheel in the air is well enough to over power the weak centre diff's LSD (rated at about 5kg, 12kg can be had and there's one out there rated at 20kg, apparently found in a limited run of STi's but the rally guys go for the 12kg one as its a better all rounder I believe). So you get all the drive to that one wheel. Pretty rare occurrence.

Best setup you could get is a front and rear LSD. The plated are great as you can have them wound up for extra tension on the clutch packs. Downer is that for best performance they're high maintenance as you have to keep either replacing the clutch packs or re-tensioning them.

I've also heard of Torsen LSD's that are apparently very effective in the front diff application - quiet, durable and little to no maintenance...

There's plenty of info out there, just do a google search as there will be better explanations out there

Cheers

Bennie

 

[Barry]

Front and rear.

Lifting one wheel causes loss of traction on that end of drive. The power/torque of the engine to the one wheel in the air is well enough to over power the weak centre diff's LSD (rated at about 5kg, 12kg can be had and there's one out there rated at 20kg, apparently found in a limited run of STi's but the rally guys go for the 12kg one as its a better all rounder I believe). So you get all the drive to that one wheel. Pretty rare occurrence.

Best setup you could get is a front and rear LSD. The plated are great as you can have them wound up for extra tension on the clutch packs. Downer is that for best performance they're high maintenance as you have to keep either replacing the clutch packs or re-tensioning them.

I've also heard of Torsen LSD's that are apparently very effective in the front diff application - quiet, durable and little to no maintenance...

There's plenty of info out there, just do a google search as there will be better explanations out there

Cheers

Bennie

Bennie,
Do you know if the 12kg centre diff is compatible with the ABS brake system sensors, I understand that the 20kg isn't. The only thing holding me back from fitting the 12kg is that I dont want to lose the safety aspect of the ABS on road - aside from no functioning ABS, where fitted, being illegal and voiding insurance in a prang.

Wasn't aware of the high maintenance issues with plated diffs, must have a look at Torsen ones (Torque Sensing). Are they also available for the rear?

 

[El_Freddo]

I don't see why the centre LSD would have an effect on the ABS's operation.

From what I've heard you DON'T want a 20kg centre as it will make your subi a PITA to drive daily.

I don't know if they make them for the rear - but the front one is the unit to get sorted first as you need to split the box to fit it where as the rear diff can be pulled easier than the gearbox at just about any time...

Cheers

Bennie