Polyairs for 78 Series Troopy

Submitted: Friday, Jan 21, 2005 at 00:28
ThreadID: 19634 Views:2487 Replies:13 FollowUps:15
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Thinking of fitting a set of Polyairs to the rear of the Troopy to help with a bit of bottom sag when heavily loaded or when towing the work trailer.
I have been told they help with stability etc "Is this the case?" Any comments or advice would be appreciated.

I note they advertise two types for the 78 series, Red ones for about $300 and Black ones for about $700 any advice as to the pro's and con's of either model appreciated.
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Reply By: V8troopie - Friday, Jan 21, 2005 at 01:20

Friday, Jan 21, 2005 at 01:20
John, I'm curious about the rear end sag on your 78 series. I drive the 75 series and it does not overly sag with the 250kg load on the towball when I hitch on my boat. The springs got reset many years ago before going on a CSR trip but nothing had changed since on the spring shackle angle.
Do you have a large rear mounted long range fuel tank and perhaps two spare wheels on the back too? If so then the Polyairs might help. I thought about fitting some but would have to remove some spring leaves too to make them worthwhile for everyday driving.
Klaus
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Follow Up By: Member - John (Vic) - Friday, Jan 21, 2005 at 01:36

Friday, Jan 21, 2005 at 01:36
Hi Klaus
It's actually a bigger problem with the trailer thats what first started me thinking of Polyairs.

I was also under the impression that they would provide a bit more stability and some degree of lift giving me more clearance between the bump stops with a load for 4wding.

Hence I am interested in peoples thoughts and experience with them.

Why would you have to remove some leaves ? my understanding was they would fit straight on.
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Follow Up By: V8troopie - Friday, Jan 21, 2005 at 01:47

Friday, Jan 21, 2005 at 01:47
Hi John,
you asked "Why would you have to remove some leaves ? my understanding was they would fit straight on."

When you just drive around town (not towing heavy trailers) the standard suspension is already rather stiff so that the addition of polyairs would do nothing for driving comfort. Removing a leaf or two makes the adjustability of the Polyairs more useful. This is what I was led to believe, others might have a different opinion on that.

Its not because they need extra room to fit.

Klaus
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Follow Up By: Member - John (Vic) - Friday, Jan 21, 2005 at 01:55

Friday, Jan 21, 2005 at 01:55
Klaus another thought would be to lower the pressure in the Polyairs when no load support is required, therefore utilizing the original suspension and negating the leaf issue, Does this sound reasonable ?
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Follow Up By: V8troopie - Friday, Jan 21, 2005 at 02:04

Friday, Jan 21, 2005 at 02:04
Sure John, sounds reasonable to me - if it is reasonable to have a$700.- gadget under the car doing nothing :-)
Come to think of it, my troopie has expensive locking diffs fitted, doing nothing for most of the time :-))), very reasonable, LOL
Klaus
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Follow Up By: Member - Davoe (WA) - Friday, Jan 21, 2005 at 10:17

Friday, Jan 21, 2005 at 10:17
v8 troopie, difference between your 75 and a 79 is the length of the spring. Toyota lengthened the leafs in the 79s to give a better unladen ride and they claimed it would not greatly effect carrying capacity, but there is definitly a difference. most load carrying 79s have heavier duty spings with at least 2 extra leaves
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Follow Up By: toymn8r - Saturday, Jan 22, 2005 at 13:55

Saturday, Jan 22, 2005 at 13:55
John

I was thinking along similar lines myself.

Would a small shackle lift on the rear do the job and still allow the leaf setup to work properly?

I have a 78 troopy with rear wheelcarrier and have noticed a drop in the rear as soon as the wheel carrier was fitted.

Bart
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Reply By: tessa_51 - Friday, Jan 21, 2005 at 07:05

Friday, Jan 21, 2005 at 07:05
John
I've had polyairs on my Playdoe for a couple of years . I put them on for the very reason you are talking about. Sagging in the rear end when towing and carrying a big load. I find them excellent. When empty I run them on about 5psi just to protect them from rubbing or getting caught in something underneath. At thast pressure you don't even know they are there. Fully loaded I run them on 30 psi. I was told to always pump them up fully (?35psi) before you put the load on them, then load the vehicle, attach the towed vehicle and let them down till the vehicle levels out. You will be surprised by the amount of lift they give the rear of the vehicle. Only complaint I have is that they are so small it is difficult to adjust the pressure in them. I would think they probably only hold a litre each. Make sure you get a good pressure gauge with graduations in one or two psi's. I tried one of those automatic compressors they have at some service stations but it couldn't cope with the small amount of air required to make the adjustments. By the way my truck has rear coils which the polyairs fit inside, so I don't know how they will go with leaves.
Tessa
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Follow Up By: Member - John (Vic) - Friday, Jan 21, 2005 at 12:04

Friday, Jan 21, 2005 at 12:04
Thanks Tessa good info.
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Reply By: Baz (NSW) - Friday, Jan 21, 2005 at 07:26

Friday, Jan 21, 2005 at 07:26
Hey John, i had polyairs on the Explorer and they made a big difference as the Explorer do suffer from bad sag in the rear, it also helped with stability as well as lifting the car too.

Only thing they didn't do was help me float !!!

Baz.
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Follow Up By: Member - John (Vic) - Friday, Jan 21, 2005 at 12:07

Friday, Jan 21, 2005 at 12:07
Hi Baz
I have what you need, floaties for cars, we call them lift bags in the diving Industry and we use them to salvage all sorts of things.

A couple of 3 tonne enclosed bags down either side would have keep you afloat no problems. LOL.

Cheers mate hope you enjoy the new beast catch up one day.

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Reply By: Willem - Friday, Jan 21, 2005 at 08:16

Friday, Jan 21, 2005 at 08:16
John

Have you worn the poor Troopie out already. Time for a new one mate. LOL
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Follow Up By: Member - John (Vic) - Friday, Jan 21, 2005 at 12:03

Friday, Jan 21, 2005 at 12:03
LOL about 18 months and she is is due for trade in or sale.
Want to buy it ? a real quality vehicle. LOL. (You don't have enough vehicles now)

Nah just like to level her out with the work trailer, it's a bit heavy as you could guess so interested in comments on the Polyairs as I have never used them.
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Reply By: Member - Crazie (VIC) - Friday, Jan 21, 2005 at 08:20

Friday, Jan 21, 2005 at 08:20
g'day John

Got the Red ones, cause they're faster, in the back of the Jack. Use them when we are fully loaded and towing the boat. Makes a big difference with clearance and leveling out the 4by. Gives a bit more stability when loaded up.
cheers
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Follow Up By: Member - John (Vic) - Friday, Jan 21, 2005 at 12:10

Friday, Jan 21, 2005 at 12:10
Hiya Adam
I figured that was the case, red always goes faster, especially as you get older.
Just ask Willem, he drives a red car and it must go faster. LOL.
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Reply By: Member - Phil G (SA) - Friday, Jan 21, 2005 at 12:20

Friday, Jan 21, 2005 at 12:20
I've just considered the same for my 79series. But $700 for the polyairs is about the same as a set of new springs. I've actually spend some extra money and got the OME leaf springs as they are allegedly a 2-stage spring. I'll put them on at the weekend and see how they go.
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Follow Up By: Member - John (Vic) - Friday, Jan 21, 2005 at 12:48

Friday, Jan 21, 2005 at 12:48
Hi Phil would be interested in your thoughts after you completed the fit up.

The black bellows are listed at about $700 the red coil set is about $300.
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Follow Up By: Member - Phil G (SA) - Friday, Jan 21, 2005 at 19:23

Friday, Jan 21, 2005 at 19:23
Hi John,

I'll keep you posted. I've got a complete OME system with front coils/ rear leaves and Nitrocharger shocks and greasable shackles. They give you choices for the rears - I've got the springs for a minimum 400kg load, which is almost what will be on there with new canopy/basic gear/tanks etc.

There will probably be stuff posted to the 70scool email group as well.

Cheers
Phil
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Reply By: Wombat - Friday, Jan 21, 2005 at 12:59

Friday, Jan 21, 2005 at 12:59
Hi John,

When we lifted the Triton we added Polyaires for towing the camper trailer. Apparently for some vehicles there is a choice of general purpose (red) or heavy duty (black). If you put the two side by side the stronger construction of the black ones is fairly obvious, but only you will know whether the additional $400 is justifiable for your application. They are very easy to fit, even a mug like me can do it, and after sales service from Polyaire in Sydney is excellent. Upon inflation for the first time it was obvious that there was a fault in the construction of one of ours and it was replaced with no questions asked.

The trick with them is to inflate to the maximum of 30psi (no higher!) prior to hooking up the trailer and then lower them until you're happy with the height. With the huge towball weight on the Silhouette camper I run them at the full 30psi. After you are finished towing simply lower them to the minimum 5psi (no lower!) and you don't know they are there. I have left them at 30psi on occasions in the Buckland Vallet for the additional clearance but the ride does tend to get a bit "choppy".

Overall, I think they are a great product. Just make sure if you do fit them that you don't cut the air hoses too short but allow enough additional hose for movement.
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Reply By: ianmc - Friday, Jan 21, 2005 at 13:57

Friday, Jan 21, 2005 at 13:57
Arent the red ones poly fabric & the blacks rubber bellows??
Do a search for Firestone air bags & they can be imported for a fraction of some of those in our 4x4 shops provided U can identify thaose U want on US specified vehicles. Also can get dash mounted kit & compressor to control ride whilst on the move.
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Reply By: Crackles - Friday, Jan 21, 2005 at 17:21

Friday, Jan 21, 2005 at 17:21
John. The experience I've had with fitting the Red Polyairs to leaf sprung vehicles has been unsuccesful. They struggle to keep the vehicle at normal ride height when loaded yet restrict the downward travell. The supporting coil & mounting brackets are a little flimsey for my liking also.
The black bellows type however are excellent & built strong enough for the weight of a troopy. They are rated to 100 PSI unlike the red ones at 30 PSI. A travell mate has them fitted to his 78 tray & gives him the flexability to ride empty or load his Trayon camper & boat on & still remain level. 4 years on & no issues despite overloading his bus up to the Cape & Gulf several times.
Cheers Craig............
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Follow Up By: Member - John (Vic) - Friday, Jan 21, 2005 at 19:39

Friday, Jan 21, 2005 at 19:39
Mate thats just the type of info I was looking for.

I was considering the black ones and was going to follow up on them from the States as some on here have done before.

That way I would hopefully end up with the heavy set at around the price of the red ones.

The bracket info is just the feed back I was looking for.

Cheers
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Reply By: Member - Banjo (SA) - Friday, Jan 21, 2005 at 17:48

Friday, Jan 21, 2005 at 17:48
Didja check out the direct purchase option from the US to say $ ? See post 17937.
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Follow Up By: Member - John (Vic) - Friday, Jan 21, 2005 at 19:40

Friday, Jan 21, 2005 at 19:40
Yeah thanks saw that info in the archives, was going to follow that lead once I had determined what I wanted.

Cheers.
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Reply By: Richard Kovac - Saturday, Jan 22, 2005 at 15:05

Saturday, Jan 22, 2005 at 15:05
John
I've been thinking of using these Firestone airbags they use them on the NDC Ute's and troopys over here in the west they have them in kit form and are made the same as large truck airbag

ride-rite

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Unit 1, 126 South Pine Rd. Brendale Queensland
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Tel: 07 3889 6556 Fax: 07 3889 6557
Email: info@airbagman.com.au Regards
Richard

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Reply By: Richard Kovac - Saturday, Jan 22, 2005 at 15:07

Saturday, Jan 22, 2005 at 15:07
John
I've been thinking of using these Firestone airbags they use them on the NDC Ute's and troopys over here in the west they have them in kit form and are made the same as large truck airbag
http://www.ride-rite.com/

AIRBAG MAN
Unit 1, 126 South Pine Rd. Brendale Queensland
Australia
Tel: 07 3889 6556 Fax: 07 3889 6557
Email: info@airbagman.com.au Regards
Richard

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Follow Up By: Member - John (Vic) - Saturday, Jan 22, 2005 at 16:57

Saturday, Jan 22, 2005 at 16:57
Thanks Richard have emailed them to find out the details.

Cheers
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Reply By: kesh - Saturday, Jan 22, 2005 at 15:46

Saturday, Jan 22, 2005 at 15:46
Like many of the others I have the "black" Polyair bags under the 75 trayback. They do all and more that any respringing could do, 20psi for an easy ride, 100psi for 5 drums in the back and still a level ride. Same if you have a heavy front on trailer. Mind you, I dont know what sort of back yard mob Toyo. get their springs from! Even the 79's are sagging from nearly new.
Mine are 5 yrs. old, no problems.
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