Are all non adjustable diffs 50/50 front and rear drive? ie 2002 wrx.

 

No its something like 46/54, cant remember off hand, may say in the handbook but its more bias towards the rear than the front.

Tony

 

Aren't they a viscous coupling thud changing all the time?

 

cheers m8ty

 

Yup, it depends if there is a wheel slipping or not.

If there is no wheel spin its pretty much 50:50 distribution.

However, when a wheel loses traction the centre diff limits power to the slipping axle resulting in a different power split. The actual split ratio depends on the year and spec, but is usually in the region of 35:65 to 45:55

If it was open diff (like a Land Rover Defender, for example), it would be 50:50 until a wheel breaks traction- when it will be 0:100 in the worst case. With a centre LSD the slip is limited so you will never get into a 0:100 situation.

However even if you have a 60:40 split, if you overload it, by say removing a rear prop shaft - then see how fast you'll be able to drive. The answer is not very far and not very fast

 

A fully open diff, will maintain 50/50 torque split, no matter what grip is available at either end of it.

An LSD creates more dynamic torque split changes with grip / resistance, rather than less.

A fully locked diff, effectively means that the torque split will be proportional to the available grip at each end of the diff - more grip = more torque.

Counter intuitive until you really think about it.

Simon

 

So what does an 01 WRX have ? an LSD ?

ta !