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Product Review: Polyair Suspension Airbags

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  • Product Review: Polyair Suspension Airbags

    I've just completed an article on the Polyair airbags and my installation.

    http://www.pradopoint.com/viewtopic.php?p=5999#5999

    Just posting here incase it might apply to 90 series as well.

    Enjoy,

    Drew.
    2005 Toyota LandCruiser GRJ120R Prado "Pilbara" (GX+) Petrol V6 5 Speed Auto, ARB AirLocker rear diff locker, Safari Snorkel, Bilstein Shocks, OME 2" Lifted Springs, PolyAir airbags, bash plates, Icom HF Transceiver, Uniden UHF CB, HID and LED lights, Black Duck seat covers, Tekonsha Prodigy trailer brake controller, Redarc Dual Battery Controller, ATS4X4 Side Steps/Rock Sliders.

  • #2
    Drew
    Well done. Excellent pics & descriptions of the process.
    Articles like yours make it soooooo much easier to consider the pro's and cons of doing it yourself.
    Thanks
    PeteS
    120 D4D Auto GXL 2007

    Comment


    • #3
      Re: Product Review: Polyair Suspension Airbags

      I installed Firestone Coil-Rite airbags to my SWB (height 9.00", width 4.75"), because the rear suspension bottom constantly when towing something heavy.

      There is no conical bumpstops inside the springs, like in LWB models. So I got spacers turned there and everything was easy after that.
      This kit was part 4107 (not for Toyota), thatīs why I didnīt got the right size spacer in it. Kit 4123 was sold out (meant for 96-97 Toyota 4Runner), it would fit right in place. Both kits use the same airbag (6021).

      Itīs a little bumpy if there is any pressure and no load in trunk, ok if bags are empty (there should be min. 5 psi, but I think itīs quite safe to drive bags empty). It lifts rear suspension about 1 cm with 1 bar and 2 bar and more itīs 2 cm.




      [size=1]
      2007 FJ Cruiser 6M/T[/size]

      Comment


      • #4
        Re: Product Review: Polyair Suspension Airbags

        ok if bags are empty (there should be min. 5 psi, but I think itīs quite safe to drive bags empty)

        It's not about safety... the 5psi is to keep the bag firmly in place, this reduces the possibility of the bag being pinched between the coils and also dirt/small stones getting under or between the bag and coils and causing increased wear and tear.


        Mick
        [CENTER][B][I][SIZE=1][COLOR=blue]1KZ-TE Turbo Diesel, 5 speed manual, 3.5 inch lift, 265/70/17 Mickey Thompson MTZ, D-Tronic chip, Boost controller, mandrel exhaust, dump pipe, modified intake, ARB steel bar, Magnum winch, Safari snorkel, rear drawers, half cargo barrier, dual batteries, Uniden UHF, Sat Nav, reverse camera, Magellan XL , Tjm bash plates, ARB alloy roof rack, rear telescopic work light and numerous other modifications!!!
        Now with 3BAR MAP sensor & 18PSI Boost![/COLOR][/SIZE][/I][/B][/CENTER]

        Comment


        • #5
          Re: Product Review: Polyair Suspension Airbags

          Yes, I agree - keep at least 5psi in them as per manufacturers orders.

          I lost a bag on my 90 series, it ruptured and when I pulled it out it looked like it had been rubbing on the coil or maybe a stone but was punctured.

          You need a good pressure guage to get accurate readings down to 5psi.
          Dave
          Views expressed are mine alone and are not intended to compromise the integrity of my employer nor offend those who may read such views.
          Bugger Bali, get out and see Australia before we sell it all to China.

          Comment


          • #6
            Re: Product Review: Polyair Suspension Airbags

            Originally posted by Bushbasher
            Yes, I agree - keep at least 5psi in them as per manufacturers orders.

            I lost a bag on my 90 series, it ruptured and when I pulled it out it looked like it had been rubbing on the coil or maybe a stone but was punctured.

            You need a good pressure guage to get accurate readings down to 5psi.
            I had Coil Rite airbags fitted a few weeks ago.
            I am yet to test them under a load ... 2000kg van on order
            Any suggestions as to a quality tyre pressure guage.
            Mine is good but not at very low pressures below 10 psi
            White GXL Auto D4D 1/08 Option Pack 1
            Tow bar, Brake controller, dual battery, ORS fridge slide and home made shelves not finished too busy traveling. Coil Rite Air suspension helpers. Rhino bars, Icom 440 UHF CB

            Comment


            • #7
              Re: Product Review: Polyair Suspension Airbags

              Hi

              I run polyair style airbags... A piece of insight... for overide braked trailers

              As you pump up the preasure note that a heavly loaded tow ball will lever the ride height of the vehicle overall, (lift the front) this stiffening of the ride, means you will have less braking traction on the front wheels because there is no loading from forward lurch effect when braking hard. This is made worse by the braking load balancer and ABS as they stop you getting suffient braking load (worse in the wet) to the rear wheels to activate the overide brakes on the trailer .. hence you loose much of your stoping power

              From experiance not proffered as good advice ( better is if you need airbags chances are your triler is poorly loaded.. so fix that first) pulling on the hand brake (hold down the ratchet button) over rides the effects of the ABS and the braking load balancer by moving the braking load to the rear wheels this activates the overide brakes thus transfering load back to the front axle on the car and if you are lucky you will have time to stop...

              Comment


              • #8
                Re: Product Review: Polyair Suspension Airbags

                Originally posted by Andrew b
                Hi

                I run polyair style airbags... A piece of insight... for overide braked trailers

                As you pump up the preasure note that a heavly loaded tow ball will lever the ride height of the vehicle overall, (lift the front) this stiffening of the ride, means you will have less braking traction on the front wheels because there is no loading from forward lurch effect when braking hard. This is made worse by the braking load balancer and ABS as they stop you getting suffient braking load (worse in the wet) to the rear wheels to activate the overide brakes on the trailer .. hence you loose much of your stoping power

                From experiance not proffered as good advice ( better is if you need airbags chances are your triler is poorly loaded.. so fix that first) pulling on the hand brake (hold down the ratchet button) over rides the effects of the ABS and the braking load balancer by moving the braking load to the rear wheels this activates the overide brakes thus transfering load back to the front axle on the car and if you are lucky you will have time to stop...
                Weird problems to me... :shock: I think that the brakes would work better without the load sensing valve at all. I have tighted it as much as possible + changed the spring more to tighter one. Now the brake balance is good, it brakes even both axles. No weight moving to front any more, I hate it.

                If you have to play with hand brake while braking, something is really wrong :!: Go and tighten that load sensing valve as much as possible or take it off/pass it, you donīt miss it! The brakes are not back weighted at any circumstances without the valve if you have ABS.
                [size=1]
                2007 FJ Cruiser 6M/T[/size]

                Comment


                • #9
                  Re: Product Review: Polyair Suspension Airbags

                  Thanks for the insight...

                  My post was seeking to provide insight that hardening the rear suspension using air bags to accommodate a ball heavy trailer could create a levering effect that takes weight off the front wheels.... jacks the whole car.... of course any weight rear of the rear wheels would have the same effect....

                  In my case I hadn't noticed the change in stance... It wasn't till I was in flight that my challenge became apparent....

                  The problem is hardening the rear suspension to carry a load behind the rear wheels changes the vehicles balance therefore a general loss of front end grip/traction... whilst in my case this became apparent with loss of braking it is but one of the dangers...

                  I have moved the boat back on the trailer by 300mm to lighten the tow ball load... yet to see if that balances the Prado better... also will try with say 15 instead of 25 psi... so the rear springs rather than levers...

                  interested in your thoughts...

                  Comment

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