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CR-V::General Opinions, Commentaries and Observations Voice your CR-V thoughts here that do not specifically belong in the other topics.

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  #1  
Old 12-23-2009, 03:42 PM
Gedddyboy Gedddyboy is offline
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Default Transition from 2 to 4 wheel drive.

Hi,

Here in the UK we are having our worst winter for 20 years. Fortunately, as a CRV (4X4) owner, I should not suffer as much as our 2 wheel (front) neighbours. However, I have no knowledge of how the car should change to 4 wheel drive and what to look out for, especially how well the change from 2 to 4 wheel drive is implemented and what to expect when it kicks in.

I do know that I managed to climb a ramp that I could not manage in our 2 wheel drive car but did not notice any wheel spin; is this normal?
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Old 12-23-2009, 03:47 PM
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The rear differential has a clutch pack and two pumps.
One pump is driven by the propeller shaft attached to the transmission, the second pump is driven by the rear axles.
When the front and rear wheels are turning at the same speed the pumps are putting out the same amount of pressure, and the clutch packs are dis-engaged.
When the front wheels slip, the pressure difference between the two pumps causes the clutch packs to engage and transfer some power to the rear wheels.
Once the front and rear wheels are spinning at the same speed, the pressure equalizes, and the clutch packs dis-engage.

Unless you force it to happen, maybe by accelerating hard from a stop in slippery conditions, you probably won't notice the transfer of power.

Here's a youtube.com video of a 1st Gen CR-V in the snow. Notice at the beginning that the front wheels spin for a second, then all four wheels are spinning.

http://www.youtube.com/watch?v=OKb33sUz0SE

So, yes, it's normal.

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Old 12-23-2009, 04:03 PM
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When you need it, it will be there. That is the beauty of it.

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Old 12-23-2009, 07:15 PM
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Quote:
Originally Posted by Gedddyboy View Post
............. and what to expect when it kicks in.
If you hit the gas hard in the snow you will have the rear end fish tail like a rear wheel drive vehicle, if you drive normally you will just expect to have great traction and forward mobility .
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Old 12-23-2009, 08:02 PM
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I used to keep it in a lower gear and keep my foot on the throttle with higher revs so as to have more control over the possible engagement of the rears. Practice different techniques to give yourself an idea of how the vehicle will respond.
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Old 12-23-2009, 08:58 PM
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You may find you can drive it with a little more 'intent' and you may feel it pushing from behind. Just don't act like a teenager when cornering or you'll find the whole thing going sideways.

If it grunts or squawks when the AWD cuts in, that proves your Dual Pump Fluid in the rear differential is exhausted. You won't wreck anything, but the correct interval for that stuff is 30,000 miles (50,000 Km) and you need one litre to replace it. You get it at HONDA dealers and anybody can change it for you (Monkey Lube).

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Old 12-27-2009, 04:16 PM
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Having good snow-rated tires will help you more than the 4x4 will.
But having 4x4 is still nice to have...


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Old 12-28-2009, 09:07 AM
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Just pay attention to what the front wheels are doing and realize that when power is transferred to the rear wheels, the vehicle can get tail-happy.
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  #9  
Old 12-29-2009, 09:45 AM
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Quote:
Originally Posted by 'Curly Q Links' View Post
You may find you can drive it with a little more 'intent' and you may feel it pushing from behind. Just don't act like a teenager when cornering or you'll find the whole thing going sideways.


That is the precise point when you nail the gas and turn into the skid to power out of it.
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