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  #85  
Old 08-08-2012, 02:38 AM
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Re: Grand Cherokee + sand = FAIL

A photo of Quad bike sand tyres below. Smooth to provide floatation on the sand (a big surface area), but paddles to dig in and bite for acceleration. Note the front tyre has basically just a central spine for steering bite.

Normal road based tyres on a 4x4 are fine on sand at normal speeds, provided you air down. It is all about mass and footprint (surface) area. The more you air down (within reason) the bigger the tyre contact footprint providing floatation. The classic example is a woman in high heels and an elephant. Which will penetrate further into the sand? The woman - her contact footprint is smaller so her mass has less area to be distrubuted over. I'll let you consider the relative weight of the woman compared to an elephant based on your own experience.

Physics lesson over.

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  #86  
Old 08-08-2012, 02:55 AM
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Re: Grand Cherokee + sand = FAIL

What pressures are you all running in the sand? I've been running 16 psi with the 20 inch wheels. There is not a lot of sidewall in them really. Ill agree I am definitely not experienced in the sand, however, I don't think I'm doing anything to cause this failure. On both occasions I was driving in a straight line where others were driving at a constant speed (40km/h) once the 4wd service light comes up the car just digs in at the back. To be honest I didn't change the throttle position until I lifted off when the back sunk in. Can anyone suggest what I should do different next time?
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  #87  
Old 08-08-2012, 02:57 AM
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Re: Grand Cherokee + sand = FAIL

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Originally Posted by floosy View Post
What pressures are you all running in the sand? I've been running 16 psi with the 20 inch wheels. There is not a lot of sidewall in them really. Ill agree I am definitely not experienced in the sand, however, I don't think I'm doing anything to cause this failure. On both occasions I was driving in a straight line where others were driving at a constant speed (40km/h) once the 4wd service light comes up the car just digs in at the back. To be honest I didn't change the throttle position until I lifted off when the back sunk in. Can anyone suggest what I should do different next time?
Don't take the Jeep

EDIT: Sorry Mate. Couldn't help it. Rapidly falling out with my vehcle....not the car's fault, just the lack of parts and apathy.
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  #88  
Old 08-08-2012, 03:29 AM
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Re: Grand Cherokee + sand = FAIL

Quote:
Originally Posted by floosy View Post
What pressures are you all running in the sand? I've been running 16 psi with the 20 inch wheels. There is not a lot of sidewall in them really. Ill agree I am definitely not experienced in the sand, however, I don't think I'm doing anything to cause this failure. On both occasions I was driving in a straight line where others were driving at a constant speed (40km/h) once the 4wd service light comes up the car just digs in at the back. To be honest I didn't change the throttle position until I lifted off when the back sunk in. Can anyone suggest what I should do different next time?

Hi floosy

what model and year is ur jeep?
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  #89  
Old 08-08-2012, 03:33 AM
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Re: Grand Cherokee + sand = FAIL

It was built August 2011. I think it was one of the first to arrive without recovery hooks. It's an overland
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  #90  
Old 08-08-2012, 04:40 AM
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Re: Grand Cherokee + sand = FAIL

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Originally Posted by floosy View Post
It was built August 2011. I think it was one of the first to arrive without recovery hooks. It's an overland

Thats a bit of a worry my build date is 4 August 2011 and its a 2012 model. I have done some light beach work with no problems but.........

Milous can you shed some light here????
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  #91  
Old 08-08-2012, 06:24 PM
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Re: Grand Cherokee + sand = FAIL

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Originally Posted by Jasman View Post
Hi Bob, I'm not having a go at all and I stand to be corrected but I think you'll find the photo you posted is a steer tyre, the rear tyres on dune buggies and MX bikes set up for sand run a paddle type design. If you ever want to watch something wild find a Crazy Dirt Demons DVD when they're out in the desert, using their paddle drive tyres they do massive jumps between and over dunes and it looks spectacular.
Jasman.
Yes I can see how deep paddles would work on sand. They would tend to lock in rather than dig a hole.
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  #92  
Old 08-08-2012, 08:08 PM
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Re: Grand Cherokee + sand = FAIL

Further to my post at #68, I have had further correspondence with Chrysler in Melbourne.



Basically Chrysler have advise me, in writing, that the TSB is for the suspension - not the 4x4 failure and they are awaiting resolution from USA.

To keep pressure on this I implore all on this forum to email your concerns regarding the 4x4 failure to :

Shona Ruse <Shona.Ruse@chrysler.com> (in melbourne)
'todd.goyer@chrysler.com' (todd.goyer@chrysler.com) (in the states)

And your dealer.

Do it now!
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Old 08-08-2012, 08:49 PM
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Re: Grand Cherokee + sand = FAIL

And I've just emailed the details to 4x4 Aust magazine.

Remember that the GC was their 4x4 of the year so they have some buy in to the vehicle - it is their awards reputation on the line too.


4x4Australia <4x4Australia@acpmagazines.com.au>


To all of you who suggest we go to the mainstream media - do it!

Write an email and be heard.

Even if we don't get anywhere, it will make you feel better and you wont just be shouting into the wind on this forum.
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  #94  
Old 08-08-2012, 09:04 PM
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Re: Grand Cherokee + sand = FAIL

If you go to mainstream media, all you'll get is wowser environmentalists saying "serves you right, and you shouldnt be driving on beaches". It will be followed by the Toyota / Nissan band wagon making fun of you.

I reckon that strategy will backfire big time, and Chrysler in the US will see nothing of it anyway.
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  #95  
Old 08-08-2012, 09:33 PM
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Re: Grand Cherokee + sand = FAIL

Quote:
If you go to mainstream media,
I agree with you if you are referring to A Current Affair and the like. I'm not suggesting that.

What I'm suggesting is the the 4x4 friendly media - thus my link to 4x4 Australia.

I'm sure I am like everyone else on this forum. I need this hassle like a hole in the head and problems with the GC, real or perceived, will effect resale values and perception out on the tracks from other brand owners. I wish I could just ask Chrysler nicely and I got the response "yes sir, only too happy to help - here is the solution". But life isn't like that. The squeeky wheel...


Up to you - you can post here and preach to the converted, or help by squeeking with me.
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Old 08-08-2012, 09:35 PM
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Re: Grand Cherokee + sand = FAIL

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Originally Posted by GMWK2 View Post
I agree with you if you are referring to A Current Affair and the like. I'm not suggesting that.

What I'm suggesting is the the 4x4 friendly media - thus my link to 4x4 Australia.
Cool ... I just had visions of Harold Scruby all over it like a rash.
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