jamesmartin
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been an interesting discusion 
WARNING: FREELANDER SPARES VCU's
- Thread starter austen
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Diesel Do
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Why doesn't some clever sod make 50/50 IRD gearing?
when i think of a differencial, i can't help but think of side to side rather than front to rear.
and take all the fun away from the VCU?
Diesel Do
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Think orrible smelly tratter. They've got three proper diffs
jamesmartin
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you would if you thought of disco defender and rr
jamesmartin
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Diesel Do
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Be the next best thing to curing 1.8 head gasket failures
Diesel Do
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Could do chocolate head gaskets too!
Oh hold on Land Rover patented them! Bugger
Oh hold on Land Rover patented them! Bugger
Be the next best thing to curing 1.8 head gasket failures
mines only gone once
now it's got all the recommended crap fitted ( no guarentees ;( )
Diesel Do
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mines only gone once
now it's got all the recommended crap fitted ( no guarentees ;( )
Mines never gone
but my alternator caught fire yesterday
Diesel Do
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Hmmmm, was out playing, luckily it started misfiring, was mopping water out of the plug holes and there was two inch flames coming out of the back of it! Brush pack expired thank god for missfires
thank god for missfiresHmmmm, was out playing, luckily it started misfiring, was mopping water out of the plug holes and there was two inch flames coming out of the back of it! Brush pack expired
yep great to have a warning
i'll check mine then afore it cremates itself
Diesel Do
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I've dunked it in mud too often, the grit has destroyed the brushes and it's formed a carbon paste! Then just shorted it out disconnected it and drove home on battery power
disconnected it and drove home on battery powerI may be pulling this figure out of the air but I thought freebys ran a 90/10 split for on road driving with this changing as front wheels lost grip and power got fed backwards.
Is there really no known proper figure for the distribution of power bias for the car?
Is there really no known proper figure for the distribution of power bias for the car?
This is from RAVE
Viscous Coupling
The VCU (Viscous Coupling Unit) is a major component of the driveline. It effectively
controls the difference in speed between the front and rear prop shafts and
influences the amount of torque distributed to the front and rear differentials. In
theoretical terms the rear wheels are 0.8% “under driven” in comparison to the front
wheels, however, this figure will change continuously as the vehicle’s speed and
dynamics alter.
The VCU is a sealed unit filled with a silicon fluid material. It comprises an input shaft
and plates, and an output shaft and plates. The plates fitted to both input and output
shafts contain holes through which the silicon fluid is able to pass. The silicon fluid
material offers a resistance to shear. Its effective resistance to shear increases as
the differential in speed, between the input (i.e. front prop shaft) and output (i.e. rear
prop shaft), increases. This characteristic results in the appropriate division of drive
torque between the front and the rear differentials to maximise traction in all
conditions.
In practice, whenever the front or rear wheels start to spin, the difference in speed
between the two prop shaft sections increases. The VCU reacts in these
circumstances, as described. It consequently makes it more difficult for the prop
shafts to revolve at different speeds and thus delivers a greater proportion of the
drive torque to the “non-spinning” differential. The VCU is sealed for life component
and does not require any routine maintenance or servicing, over and above visual
inspection to its external casing.
Viscous Coupling
The VCU (Viscous Coupling Unit) is a major component of the driveline. It effectively
controls the difference in speed between the front and rear prop shafts and
influences the amount of torque distributed to the front and rear differentials. In
theoretical terms the rear wheels are 0.8% “under driven” in comparison to the front
wheels, however, this figure will change continuously as the vehicle’s speed and
dynamics alter.
The VCU is a sealed unit filled with a silicon fluid material. It comprises an input shaft
and plates, and an output shaft and plates. The plates fitted to both input and output
shafts contain holes through which the silicon fluid is able to pass. The silicon fluid
material offers a resistance to shear. Its effective resistance to shear increases as
the differential in speed, between the input (i.e. front prop shaft) and output (i.e. rear
prop shaft), increases. This characteristic results in the appropriate division of drive
torque between the front and the rear differentials to maximise traction in all
conditions.
In practice, whenever the front or rear wheels start to spin, the difference in speed
between the two prop shaft sections increases. The VCU reacts in these
circumstances, as described. It consequently makes it more difficult for the prop
shafts to revolve at different speeds and thus delivers a greater proportion of the
drive torque to the “non-spinning” differential. The VCU is sealed for life component
and does not require any routine maintenance or servicing, over and above visual
inspection to its external casing.
jamesmartin
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v/c is a good device ,gives less issues in rr were both axles are equally driven
