awd and park

[Todd]

Hi All,

Not to ask too stupid a question, but in AWD,
are all four wheels locked in park or just the
front two or just the back two?

Many thanks,
-T

 

[Carl 1 Lucky Texan]

Hi All,

Not to ask too stupid a question, but in AWD,
are all four wheels locked in park or just the
front two or just the back two?

Many thanks,
-T

hmmmm....fun question!

(I assume you are not refering to the use of the emergency brake)

I'd say 'most' AWD subes have 1 front and 1 rear wheel 'locked'.
WRXes, some Foresters (IIRC) maybe most Outbacks have rear LSD so
probably 1 front and 2 rear are 'parked'. STI may depend on the DCCD
setting.

OK - ATTACK!!!

lol!

Carl

 

[JD]

Hi All,

Not to ask too stupid a question, but in AWD,
are all four wheels locked in park or just the
front two or just the back two?

Many thanks,
-T

For an automatic, the front wheels are locked. It must be an auto since
standards don't have 'park'.

 

[Carl 1 Lucky Texan]

For an automatic, the front wheels are locked. It must be an auto since
standards don't have 'park'.

But is the wet clutch pack in the tailshaft of the automatic 'locked'?

And the front diff is 'open' so, there is 'sorta' just one wheel
'locked'? No, wait, if it was on a lift, one wheel would spin opposite
it's mate - but, yeah, on the ground their locked.

I guess i was thinking about 'torque transfer'.

nvrmd

;^)

Carl

 

[JD]

But is the wet clutch pack in the tailshaft of the automatic 'locked'?

And the front diff is 'open' so, there is 'sorta' just one wheel 'locked'?
No, wait, if it was on a lift, one wheel would spin opposite it's mate -
but, yeah, on the ground their locked.

I guess i was thinking about 'torque transfer'.

nvrmd

;^)

Carl

Yup. The auto AWD is different from the manual transmissions. You're right
though; if it was off the ground, one wheel would spin one way and the other
in the opposite direction. However, the clutchpack does lock unless it
detects a difference in speed between the front and rear wheels, and the AWD
is electronic. In park, with the ignition turned off, the rear would not be
locked. It would be the same as removing the AWD fuse.

 

[Todd]

Yup. The auto AWD is different from the manual transmissions. You're
right though; if it was off the ground, one wheel would spin one way and
the other in the opposite direction. However, the clutchpack does lock
unless it detects a difference in speed between the front and rear
wheels, and the AWD is electronic. In park, with the ignition turned
off, the rear would not be locked. It would be the same as removing the
AWD fuse.

Thank you!

 

[Guest]

Hi All,

Not to ask too stupid a question, but in AWD,
are all four wheels locked in park or just the
front two or just the back two?

Many thanks,
-T

With the engine running, or off?

With the engine off, the clutch pack I believe is dis-engaged since
its pump pressure that forces the clutches together, but it would
still drag a bit. If it didn't drag at all with the engine off, there
would bge no negative effect from a 2-wheel tow, and there is indeed a
bad effect on the clutches.

Engine on, depends on what subaru does with the signal to the lock-
slip solenoid.

Dave