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macca
13th April 2017, 09:08 PM
Our last trip to the centre was buggered because of a bent chassis, we had air bags fitted to help the leaf springs out the back.

Fitting these bloody things is a huge mistake mainly because when they compress to their maximum there is no cushioning, its metal to metal and rock solid.

The OEM bump stop compresses and takes some of the impact also they are 80mm higher before the diff touches them, that 80mm plus is what the spring is supposed to use to do its job and with air bags can never do that job.

Met a mechanic who explained it all to me in logical language, man it would have been good to meet him ages ago.

Since we got back home last year I have been searching for a better way to support the load, resetting springs, various spring arrangements or assists, adding coils the list goes on with a fair bit of wind blown up my freckle I can tell you. Some of these people only care about a sale.

It all came down to a heavier spring pack, and as I'm no fan of a few brands Lovell's seemed to keep popping up. The research led me to a "local" shop about 65klm away.

My confidence was not high so before anything happened a trip to their place of business was required just to get the detailitus right.

I have new Tough Dog shocks on the ute, big bore and big shaft jobbies. The owner of the business sold them too and said we don't need to swap them out if I wanted a GVM upgrade... never thought of that!

So he sourced Lovell's Mil-Spec leaf packs and "matching" coils for the pointy end. It all cost a bloody arm and a leg plus a couple of dancing girls. I'm getting about OK now but don't know what happened to the girls.

All the new fruit was installed which took all day, man those 4x4 retail shops waiting areas get boring real fast. And 10 days later was engineered to 3900Kg.

Went to Tuff Trucks last weekend loaded to GVM and it was really nice to drive and IT SAT LEVEL!!!

Along this journey was a problem, there was a clunk added while it was on the hoist. It took 5 & 1/2 weeks to find, replacing gear box mounts, checking for hit marks - anything. About 18 items were replaced or repaired or diss-guarded with no success until it clunked at 5klm on a flat road - diff rotation!

It turned out to be a brace vertically above the front pin in the spring hanger, the new spring has an extra "military" wrap which filled the space required by the OEM leaf pack.

Lovell's suggested cutting the offending wrap off! Pay a small fortune for a spec spring only to remove it... no bloody way.

It was agreed the installer grind away some of the brace and now it is silent, the sound was dreadful and off-road was driving me insane.

A pair of Superior radius arms were also fitted to correct caster which has stopped the steering wandering.

So now it sits and drives so much better it is hard to believe the difference, cost was ridiculous, stress due to the clunking was frustrating but we are there now.

It was not planned to go to this level but it seems to be worth it, time will tell.

Plasnart
13th April 2017, 09:17 PM
Glad everything's finally worked out for you now macca. Personally I'd never install airbags after reading years ago as a newb how they shorten the working range of springs. Let the spring do it's job! Makes total sense to me. Too many cracked chassis from airbags. Right springs, tower braces, happy days.

macca
13th April 2017, 09:18 PM
You have got that right Plasnart.

Cuppa
13th April 2017, 09:26 PM
:) Good move Macca. I'm *very* surprised that you got away with keeping those shocks though. When I got mine done I had no choice, the Lovells approval was dependent on using all Lovells gear. At the time I asked about substituting Konis for the Lovells shocks (which would have cost more) but it was not allowed.

MB
13th April 2017, 11:42 PM
Sorry to hear your issues experienced Macca mate! You're making me stress out now since I swapped the coil bags out into Mrs MB's GU and tower braced. Saved hard enough to install Firestone coil replacements in my utes arse end complimented by Koni 90's all round and at this stage haven't looked back :-) Mind you, we don't hardcore tour on corregations like you retired lucky blokes ;-)

macca
14th April 2017, 07:49 AM
Sorry to hear your issues experienced Macca mate! You're making me stress out now since I swapped the coil bags out into Mrs MB's GU and tower braced. Saved hard enough to install Firestone coil replacements in my utes arse end complimented by Koni 90's all round and at this stage haven't looked back :-) Mind you, we don't hardcore tour on corregations like you retired lucky blokes ;-)

Mark did the OEM bump stops stay in the car?
A mate had a full airbag replacement of the coils in his GU and it was always heavy, he swore by it and never had an issue.
It still gets around here and has never had any trouble as far as I know.

macca
14th April 2017, 07:56 AM
:) Good move Macca. I'm *very* surprised that you got away with keeping those shocks though. When I got mine done I had no choice, the Lovells approval was dependent on using all Lovells gear. At the time I asked about substituting Konis for the Lovells shocks (which would have cost more) but it was not allowed.

After your experience Cuppa I was surprised when he said we will do an upgrade with the Tough Dog's instead of the Bilstein's.
Their Engineer is responsive to alternatives packages and was happy to sign it off. Pushed me toward an engineered report as there is $1100.00 in new shocks under there that could stay.

There was one shock showing signs of leaking so all 4 were replaced, that's after 6 years of use and punishment as Mark said.

The Engineer was quite informative and complimented me on using good gear right through the car, he said it braked better than any GU he had driven at that weight, when he found out it had EBC GreenStuff pads on the RDA Slotted Rotors up front he no wonder it stops - they are the best!

That is information from NissanPatrol.com. great source of real world testing is reported here so we buy once!

my third 256
14th April 2017, 08:26 AM
just a thought guys but the main problem with air bags is when used with leaf springs
oh yes there has been problems with coils too but not as many
and many people use them for the wrong reason
like wanting to be a wedge driving down the toad with the ass soo high up in the air
just my opinion fellas dont shoot me down will you

macca
14th April 2017, 08:46 AM
Some photos
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PeeBee
14th April 2017, 08:50 AM
I have 'in coil Firestone airbags' , coil tower braces and coil tower tie bar kit installed. Been running this setup for 50000klm without issue, but the airbags are used for load trimming and minor height adjustment, not replacements for the coil.

I recently had a re-think and have installed BOSS airbags between the diff housing and chassis, thus taking the cantilever load out of play with the spring tower. Again, these are used as load trimmers, installed the seem to give a more cushioned ride than the in coil units, probably because as the compression load comes on they still allow the coil to work yet assist in the rebound to adjusted raised height, where the fire stones are totally restrained by the coil spring and the compression tower is stiffer.

Only issue I have is the BOSS bags are hard to seal and the rubber does allow air to permeate over time, but minor issue.

I am happy with this set-up, but emphasis it's a load assist trim setup, not load replacement.

PeeBee
14th April 2017, 08:51 AM
Forgot to mention the suspension is gvm upgraded and engineered in Victoria as it sits.

threedogs
14th April 2017, 08:54 AM
just a thought guys but the main problem with air bags is when used with leaf springs
oh yes there has been problems with coils too but not as many
and many people use them for the wrong reason
like wanting to be a wedge driving down the toad with the ass soo high up in the air
just my opinion fellas dont shoot me down will you

I was of the opinion that air bags gave a canterlever effect.
but all sorted now by the sounds of it, how did they straighten the chassis.??

MB
14th April 2017, 10:06 AM
Mark did the OEM bump stops stay in the car? A mate had a full airbag replacement of the coils in his GU and it was always heavy, he swore by it and never had an issue. It still gets around here and has never had any trouble as far as I know.
My apologies Macca, re-read your post with both eyes open to see you were talking about airbags on your leafies mate. In regards my setup, yes PatrolApart had to install extended bump stops they found needed.

Cuppa
14th April 2017, 10:34 AM
After your experience Cuppa I was surprised when he said we will do an upgrade with the Tough Dog's instead of the Bilstein's.
Their Engineer is responsive to alternatives packages and was happy to sign it off. Pushed me toward an engineered report as there is $1100.00 in new shocks under there that could stay.

There was one shock showing signs of leaking so all 4 were replaced, that's after 6 years of use and punishment as Mark said.

The Engineer was quite informative and complimented me on using good gear right through the car, he said it braked better than any GU he had driven at that weight, when he found out it had EBC GreenStuff pads on the RDA Slotted Rotors up front he no wonder it stops - they are the best!

That is information from NissanPatrol.com. great source of real world testing is reported here so we buy once!

I suspect that if you had a 3L Patrol (for which Lovells have the approval without need for additional 'engineering') you would have had to use the Lovells shocks (unless prepared to pay the extra for engineering). My experience probably reflected the supplier/installers understanding of the requirements, but as like you I have a 4.2 which needed the additional 'engineering, (because Lovells dont have an approval for it even though all the other details of the vehicle are the same as the 3.0) if I were going through the process again I would insist upon my own choice of shocks, not because I have any problem with the Lovells shocks, just that I have a history of being very happy with Konis on a variety of vehicles.

I put the Greenstuff/RDA's on mine after the GVM upgrade. Was surprised (but relieved) it passed the engineers dynamic braking tests with the factory set up! The new front coils & brake proportioning adjustment which I have read somewhere being described as a 'mickey mouse' way of avoiding the need for brake upgrades to go with the added weight is pretty good eh? Part of the requirements of the upgrade is to ensure virtually no 'nose dive' under heavy braking.

macca
17th April 2017, 03:31 PM
I was of the opinion that air bags gave a canterlever effect.
but all sorted now by the sounds of it, how did they straighten the chassis.??

Don't know, drop it off come back 2 &1/2 day later to pick up.