jt_armstrong

Well-Known Member

• Jan 2, 2011

• #1

Just curious, anyone know what the drive ratio is between front and rear axels? I once had a Volvo XC 90 which put 90% of the power to the front wheels under normal conditions. I am assuming that the Rangie is closer to 50/50

 

jamesmartin

Well-Known Member

• Jan 2, 2011

• #2

yes 50/50

 

Datatek

Well-Known Member

• Jan 2, 2011

• #3

50/50 on the P38. I think the Volvo uses a viscous coupling to distribute the power, the P38 uses the viscous coupling to lock the centre diff.

 

D

DeadTom

Member

• Jan 2, 2011

• #4

surely with a viscous coupling the centre diff only sends power to both ends when one of the axles starts to slip?

presumably its 2wd until something starts to slip, guessing rear drive?

 

goonarmy

Beer tester

LZIR Despatch Agent

• Jan 2, 2011

• #5

DeadTom said:

surely with a viscous coupling the centre diff only sends power to both ends when one of the axles starts to slip?

presumably its 2wd until something starts to slip, guessing rear drive?

Click to expand...

nope, 4wd all time.
Think the rrc was nearer 40:60, but might be talking pish

 

Datatek

Well-Known Member

• Jan 2, 2011

• #6

DeadTom said:

surely with a viscous coupling the centre diff only sends power to both ends when one of the axles starts to slip?

presumably its 2wd until something starts to slip, guessing rear drive?

Click to expand...

On the Xtrail and I presume the Volvo, the front wheels are the main driven wheels, the viscous coupling is designed to transmit limited power to the rear wheels at all times but as you rightly say it only sends maximum power to the rear (i.e. 50/50 split) when the front wheels start to slip. Not as effective as the P38's centre diff as you have to lose traction on the fronts before the rears get much power.

 

jamesmartin

Well-Known Member

• Jan 2, 2011

• #7

rr have been 50/50 since the start had cener diff with locker until borgwarner which has center diff with viscous couplng which allows some slippage to allow for cornering and wind up the more power you put through it the harder it locks