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  #25  
Old 12-19-2011, 02:49 PM
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Re: Anyone ever put weight in the back of their WK for winter driving?

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Originally Posted by Jeep92 View Post
In my opinion, I don't think it's necessary. But i would definitely invest on some good winter tires.
This.
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  #26  
Old 01-21-2012, 07:34 PM
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Re: Anyone ever put weight in the back of their WK for winter driving?

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Originally Posted by Sorrel'sWK View Post
The hubby thinks I need to put some weight in the back of my WK for driving this winter. I am in North Dakota so ice and snow are a very good bet. I'm a decent driver but the husband is concerned. Truthfully, I'm a better driver than he is.
Actually, contrary to many of the previous posts, adding weight will increase your traction (slightly). The friction force is related to the "normal" force (i.e., vertical force, -or- weight). More weight on the wheels = more static friction force before you break into kinetic (i.e., sliding) friction. The coefficient of static friction is generally higher than coefficient of kinetic friction. You want to maintain a static friction condition between the tire and the road surface.
Amount of additional traction by adding weight is probably very small, but finite. I like to carry a cheap 50# bag of kitty litter and a small shovel in the winter. Extra weight for traction and kitty litter to throw under the tires to add traction in case I get stuck. Fortunately, I haven't needed either in the 4 Grand Cherokees ('97, '00, '03, & '08) I've had here in mid-Michigan.

As you stated, winter driving prudence precludes many of these potentially nasty situations. Good winter tires (increases coefficient of friction) are a large factor also.
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  #27  
Old 01-21-2012, 10:03 PM
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Re: Anyone ever put weight in the back of their WK for winter driving?

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Originally Posted by Walt View Post
Actually, contrary to many of the previous posts, adding weight will increase your traction (slightly). The friction force is related to the "normal" force (i.e., vertical force, -or- weight). More weight on the wheels = more static friction force before you break into kinetic (i.e., sliding) friction. The coefficient of static friction is generally higher than coefficient of kinetic friction. You want to maintain a static friction condition between the tire and the road surface.
Amount of additional traction by adding weight is probably very small, but finite. I like to carry a cheap 50# bag of kitty litter and a small shovel in the winter. Extra weight for traction and kitty litter to throw under the tires to add traction in case I get stuck. Fortunately, I haven't needed either in the 4 Grand Cherokees ('97, '00, '03, & '08) I've had here in mid-Michigan.

As you stated, winter driving prudence precludes many of these potentially nasty situations. Good winter tires (increases coefficient of friction) are a large factor also.
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Old 01-22-2012, 10:34 AM
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Re: Anyone ever put weight in the back of their WK for winter driving?

Heavy snow here Friday and I put the big salt bag back in the rear; it definitely helps, as without it the rear was slipping and sliding a lot more. Now that the streets are clear, the bag is back in the garage. The Dest. AT"s are great in the deep stuff too, where the Good Year Fortera's were very poor in comparison.
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  #29  
Old 02-02-2012, 09:21 AM
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Re: Anyone ever put weight in the back of their WK for winter driving?

I have the 3.7L QI system and have driven through almost 4 winters now and haven't had much problem without putting weights in the back, actually i havent had any problems at all i love driving this thing through the snow it would be a chore to get in real trouble with it as long as you drive according to the conditions. The truck is pretty heavy already I'm sure weights would probably help but I'll choose trunk space over that. I live in buffalo btw we know what a good lake effect storm feels like haha.
Good tires, good driving habits, and common sense is all you really need
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  #30  
Old 02-03-2012, 05:20 PM
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Re: Anyone ever put weight in the back of their WK for winter driving?

Quote:
Originally Posted by Walt View Post
Actually, contrary to many of the previous posts, adding weight will increase your traction (slightly). The friction force is related to the "normal" force (i.e., vertical force, -or- weight). More weight on the wheels = more static friction force before you break into kinetic (i.e., sliding) friction. The coefficient of static friction is generally higher than coefficient of kinetic friction. You want to maintain a static friction condition between the tire and the road surface.
Amount of additional traction by adding weight is probably very small, but finite. I like to carry a cheap 50# bag of kitty litter and a small shovel in the winter. Extra weight for traction and kitty litter to throw under the tires to add traction in case I get stuck. Fortunately, I haven't needed either in the 4 Grand Cherokees ('97, '00, '03, & '08) I've had here in mid-Michigan.

As you stated, winter driving prudence precludes many of these potentially nasty situations. Good winter tires (increases coefficient of friction) are a large factor also.
I can appreciate the physics description - and offer the second half to that equation. There are a number of forces acting upon the Jeep that we want to be concerned about - certainly the normal force is of concern for getting up and going, and added weight will increase the static friction. But what about the forces acting on the tangent (ie., in the direction of motion)? By increasing the mass of the vehicle, you are not only affecting the normal force but also the inertia of the vehicle once you get up and moving. The amount of weight that you would have to add to have a significant impact on the traction over the rear wheels would also have an impact on the overall driving characteristics of the vehicle. Personally, I would rather get stuck in the snow, than have the increased inertia of my vehicle keep it in a forward direction right into the back of someone's bumper! Remember, as the mass increases, so do the frictional requirements for braking and turning!

Pickup trucks benefit from added weight in the back because they have relatively little mass over the rear wheels. A slight change in the overall mass of the vehicle (by adding sandbags) is directed right where it is needed. In our jeeps, there is already considerable mass over the rear wheels, and they are typcially AWD/4WD!

I also think there is alot to be said about having all this weight in your vehicle loose, if you were to be in an accident (as was previously mentioned)!

... thought I would add my $.02.
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