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  #313  
Old 12-21-2012, 09:33 PM
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Re: Grand Cherokee + sand = FAIL

In our experience the tyre pressure that will work best will vary quite a bit, depending on the density of the sand and to a certain extent on the brand of the tyre and how stiff it is in the side walls.
The idea is to lengthen the footprint and hence lower the contact pressure. Wheelspin is the enemy.
I've seen plenty of examples where just another couple of psi made all the difference between constantly bogging down and breezing over the top - to say nothing of the difference in track damage.
When driver training we would recommend starting at 22 or lower and then check out the track being left - you'll soon see if you are up on top - if not let them down again.
Be aware they are baggy and vulnerable.
The lower limit is when they stop hissing - use that when you are stuck and the tide is coming in......just be careful with the power to avoid rolling the tyre off.
Heed Allypally's warnings - the internet is littered with shots of vehicle damage and worse arising out of poor decision making.
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  #314  
Old 12-22-2012, 02:12 AM
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Re: Grand Cherokee + sand = FAIL

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Originally Posted by Mendo View Post
Bob do you reckon 20psi is not low enough? I had no trouble @22psi but for this trip was going down to 20psi....
Perhaps it's OK under normal circumstances but at the time we had long berms of soft wet sand pushed up by a storm. The berms ran the length of the beach. It was fine in the loose dry sand and fine on the hard wet sand but in between was the berm and that got me every time I wanted to turn around. I've got only two maxtrax. I put them under the front wheels and got out fine with a bit of wheel spin. The maxtrax lost a couple of teath and the Kumhos got a few chips. I was glad I had the telltale leashes because the maxtrax completely burried themselves in the soft wet sand. They have a huge range of colours now. Mine are olive as you can see in the pic. They even have camo for some reason, probably for the American market. The last time I was at Stockton I ran at 18psi and the car felt was far more secure. BTW, I have 18" wheels.
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  #315  
Old 12-22-2012, 05:14 AM
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Re: Grand Cherokee + sand = FAIL

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Originally Posted by live_life_tb View Post
Is that 20psi on 18 or 20inch? Does it matter?
Mine are 20inch. First 20inch rims I have had, and I must admit I was worried at first. However, they have well and truly proven themselves to me now. 20psi seems to work well.
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  #316  
Old 12-23-2012, 03:36 AM
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Re: Grand Cherokee + sand = FAIL

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Originally Posted by John47 View Post
In our experience the tyre pressure that will work best will vary quite a bit, depending on the density of the sand and to a certain extent on the brand of the tyre and how stiff it is in the side walls.
The idea is to lengthen the footprint and hence lower the contact pressure. Wheelspin is the enemy.
I've seen plenty of examples where just another couple of psi made all the difference between constantly bogging down and breezing over the top - to say nothing of the difference in track damage.
When driver training we would recommend starting at 22 or lower and then check out the track being left - you'll soon see if you are up on top - if not let them down again.
Be aware they are baggy and vulnerable.
The lower limit is when they stop hissing - use that when you are stuck and the tide is coming in......just be careful with the power to avoid rolling the tyre off.
Heed Allypally's warnings - the internet is littered with shots of vehicle damage and worse arising out of poor decision making.
I was running 22psi most of the time (on 18inch rims) and didn't have too much trouble on Fraser Beaches. The tracks were really dry and soft and went down to 18psi for the really soft stuff and then went back to 22 for the beach. I'm not ahppy to run under 20psi when doing 80kph on the beach. I met a guy in a Wrangler sport who told me he went down to 10psi to get out of a really tricky situation!

Lower pressures also make the tyres and walls vulnerable to punctures from sticks - common in the tracks on Fraser and also reduces your clearance. Its really something that needs to be assessed for every condition.
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  #317  
Old 12-23-2012, 04:14 PM
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Re: Grand Cherokee + sand = FAIL

Well I can't believe it, I'm sitting in the waiting room at Jeep in Lismore. My ABS module is getting swapped out with the re-flashed unit as I type.

It's been a long time coming. I must say though once I got in contact with Mike Stone (Queensland Service Manager) the ball started rolling really quick.

True to his word he called back when he said he would, and had the module promptly shipped to Lismore.

Can't wait to take her back out on 7 Mile beach again with confidence. I'll post how it goes.

Merry Christmas and a happy and safe New Year to all at Jeep Garage.
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  #318  
Old 12-23-2012, 05:31 PM
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Re: Grand Cherokee + sand = FAIL

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Originally Posted by Croupier View Post
Well I can't believe it, I'm sitting in the waiting room at Jeep in Lismore. My ABS module is getting swapped out with the re-flashed unit as I type.

It's been a long time coming. I must say though once I got in contact with Mike Stone (Queensland Service Manager) the ball started rolling really quick.

True to his word he called back when he said he would, and had the module promptly shipped to Lismore.

Can't wait to take her back out on 7 Mile beach again with confidence. I'll post how it goes.

Merry Christmas and a happy and safe New Year to all at Jeep Garage.

Really interested to see how it goes. I'll be calling Mike as well in the New Year.
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  #319  
Old 12-23-2012, 08:14 PM
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I live in Sydney, do I call Mike as well or is there someone similar in Sydney?

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  #320  
Old 12-23-2012, 11:22 PM
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Re: Grand Cherokee + sand = FAIL

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Originally Posted by live_life_tb View Post
I live in Sydney, do I call Mike as well or is there someone similar in Sydney?

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NO. You want the NSW Regional Mgr. Mike is in Qld.
Sorry, I don't know the name of the NSW chap. But, firstly you will need to raise the matter with a dealer. Then if they cannot offer a fix, you escalate.
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  #321  
Old 12-23-2012, 11:35 PM
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Re: Grand Cherokee + sand = FAIL

I've been in email contact with Shona Ruse from Fiat Chrysler Group who has been very responsive and positive so far. I've been requested to book my vehicle in with the local dealer for an evaluation to determine if my vehicle is one of those affected. Shona will provide all details to my dealership after I advise her of the appointment date (thankfully) and arrange shipping of the module should my vehicle be affected.

I'll keep the forum posted on progress once I have had the evaluation (wonder what they are looking for here that they can't get from the VIN?). Mine is a 2012 (built 12/2011) V6 Laredo, I've read forum posts from others who have had issues with identical specs so I'm assuming it will too. I've not been game to test it on the beach yet, particularly since I have a young family.

Looking forward to getting this sorted so I can finally get off road with confidence.
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  #322  
Old 12-23-2012, 11:45 PM
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Re: Grand Cherokee + sand = FAIL

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Shona Ruse from Fiat Chrysler Group who has been very responsive and positive so far
Excellent!
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  #323  
Old 12-24-2012, 02:17 AM
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Excellent!
Forgot to mention, big thanks to GMWK2 for the contact info!

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  #324  
Old 12-27-2012, 11:33 PM
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Re: Grand Cherokee + sand = FAIL

Quote:
Originally Posted by Croupier View Post
Well I can't believe it, I'm sitting in the waiting room at Jeep in Lismore. My ABS module is getting swapped out with the re-flashed unit as I type.

It's been a long time coming. I must say though once I got in contact with Mike Stone (Queensland Service Manager) the ball started rolling really quick.

True to his word he called back when he said he would, and had the module promptly shipped to Lismore.

Can't wait to take her back out on 7 Mile beach again with confidence. I'll post how it goes.

Merry Christmas and a happy and safe New Year to all at Jeep Garage.
Hi Croupier,
I visited my Brisbane dealer today and have to say I was very unimpressed with their lack of interest in the problem. As the problem left me and my family in a dangerous situation, I would have expected better service and at least some concern that it didn't happen to others.

I have been advised to contact Chrysler customer service to have the issue fixed. The dealer was unable to give me Mike Stone's details even though he is the only one in Qld with the software upgrade to the ABS module on his PC!
I tried the customer service number but they are on holidays - too bad if wanted to use my "4WD" (i use this term loosely) again this summer.

Do you have Mike's number so that I can call him directly?

Thanks in advance.
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