Pathfinder suspension
Submitted: Monday, Jul 15, 2013 at 19:07
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Meridith D
We have a 2011 Pathfinder R51 and tow a 2011 Jayco Eagle OB, ball weight 159kg.
Our dilemma is that we have a bit of sag (not much but enough to be noticeable). We have flipped the tow hitch which helped but still need a bit of help.
We were going to put air bags in but after talking to a few major retailers, no one can determine whether airbags or a full
suspension upgrade is what we need.
We are OK to spend the money, but not prepared to spend the money and then have to spend more.
The attitude of these retailers seems to be "try this, and if it's doesn't work, try something else", Where's the science or their experience???????
Anyone out there in a similar situation? Do you have any good hints??????
Reply By: Member - Toyocrusa (NSW) - Monday, Jul 15, 2013 at 21:15
Monday, Jul 15, 2013 at 21:15
Hi Meridith. I don't care what the other posters say. If you want your vehicle to ride the same as it does now UNLOADED, but is able to carry a few hundred kilo in the rear then Airbags are the only way to acheive this. I have over 50 customers that we have fitted airbags to their vehicles over the last five years and not one has had a failure. There are two 200 series vehicles, both on their tow limit which equals 350kg towball weight and one has done over 80000km TOWING full time. He has 120000km on the clock. Pressures run between 5lb unloaded and 30lb loaded and as I said, they are fitted correctly and not one failure.
My own vehicle, a 2012 has done around 8000k towing. I only need 10lb loaded and my towball weight is 250kg. You should be able to get them fitted for under $500. Google the Australian retailer, Airbag Man, and ask him to recommend a fitter in your area. I'm sure you will not be disappointed.
If you don't mind a harder ride when unloaded,then go the spring/shock way. Cheers,Bob
AnswerID:
514853
Reply By: Thinkin - Monday, Jul 15, 2013 at 23:05
Monday, Jul 15, 2013 at 23:05
Hi Meridith D,
I'll give you my 20 cents worth for air bags.
Airbags are another form of bump stop, the pressure inside them are raised to compensate for extra load carried, they are not designed for
suspension travel, they may have some travel, but not to the degree of correct springs.
Any bumps or rough roads will be transmitted directly to the one point in the chassis just like a bump stop.
The problem is amplified if there is a weight on the towbar.
Springs are designed to carry weight and give
suspension travel.
There has been quite a lot of
feedback on the perils of vehicles towing with airbags resulting in bent chassis and cracked spring towers on this
forum.
No doubt there are many users of airbags that have not had problems, especially if not towing.
It's all relative to how much you will be to maximum load capacity, speed, and known road conditions.
regards Alpero
AnswerID:
514855
Follow Up By: Member - Toyocrusa (NSW) - Tuesday, Jul 16, 2013 at 06:22
Tuesday, Jul 16, 2013 at 06:22
You are talking about LEAF rear springs. The OP is talking about COIL rear springs. Totally different dynamics.
FollowupID:
794009
Follow Up By: Thinkin - Tuesday, Jul 16, 2013 at 09:21
Tuesday, Jul 16, 2013 at 09:21
I'm talking about both,
It's been documented and photo's supplied on this form that nissan patrol coil sprung models have had top's of their towers crack and bend.
Not an easy job to rectify on wagon bodied vehicles, coil sprung patrol utes are easier to work on.
All happened when fitted with stronger springs and air bags to carry exessive weight.
FollowupID:
794013
Reply By: Lyn W3 - Tuesday, Jul 16, 2013 at 10:00
Tuesday, Jul 16, 2013 at 10:00
Meridith,
Have you checked the GVM of the Pathfinder fully loaded, full of fuel, passengers, luggage etc without the van, Tare weight is around 2200kg and GVM is around 2880kg giving a carrying capacity of around 680kg which really isn't much (but typical of the newer 4WD's)
Then take off your ball weight of 150kg leaving a carry capacity of just 550kg.
It might be a simple fact that you are overloaded.
Not a simple answer as to what to do. Get a GVM engineered upgrade? Fit a
suspension upgrade and still be overloaded, buy a smaller van or bigger tow.
AnswerID:
514862
Follow Up By: Nomadic Navara - Tuesday, Jul 16, 2013 at 14:09
Tuesday, Jul 16, 2013 at 14:09
Quote "Then take off your ball weight of 150kg leaving a carry capacity of just 550kg."
If you are not employing WDH you have to subtract more than the van ball weight. Your R51 handbook gives you the down rating of your vehicle load when you have different ball weights on the back of the vehicle when not using WDH(Nissan gives you the calculations, other manufacturers don't bother.)
The following demo shows how the ball weight of the van loads up the back axle.

WDH Demostration
FollowupID:
794030
Follow Up By: olcoolone - Tuesday, Jul 16, 2013 at 18:21
Tuesday, Jul 16, 2013 at 18:21
"but typical of the newer 4WD's"...... if you call newer 4wd's anything after the 1980's.
All the four door Patrols and Landcruiser from the early 80's on could only carry between 520-660kg...... about the same as the ones of today.
FollowupID:
794051