automaic air pressure system for Polyair Springs

Submitted: Tuesday, Feb 24, 2009 at 09:15
ThreadID: 66241 Views:3978 Replies:10 FollowUps:2
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Guys (and gals),
I've had some Ployairs fitted to the rear of my 80 series for about 8 months now. They are great BUT I'd really like an automated system where I just type in the air pressure and an on board compressor just inflates or deflates to that pressure level. I know that teh blokes who sell Polyairs have a manual system but I was wondering if anyone had come across anything better. The biggest problem I'm finding is trying to find a system that will do the low air pressures required (5psi-30psi). For instance 20psi is great for the van on the highway but when it comes to an empty vehicle 4x4ing you hardly want any air in there at all.
Any ideas?
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Reply By: Willem - Tuesday, Feb 24, 2009 at 09:36

Tuesday, Feb 24, 2009 at 09:36
A stick, a handpump, and a pressure gauge. My option.

Cost effective and easy to use

OR an aircompressor mounted under the bonnet with a digital inline pressure gauge and a dash ON/OFF switch...Thats for UP.

Down?...well the Hummer uses a technique to raise and lower the pressure.

Contact Chet Clyne in Moe, VIC on 0427 110203. or 03 5127 6128. He specialises in Central Tyre Inflation

Cheers
AnswerID: 350727

Reply By: Ray - Tuesday, Feb 24, 2009 at 11:14

Tuesday, Feb 24, 2009 at 11:14
I have Polairs on the rear end of my 80 ser. I have a compressor under the bonnet and a controller in the cab. I just turn it on or off to raise or lower the rear end. There is also a pressure gauge in the cab so that I can see what pressure that I have. No problems at all.
I did have a some time ago that had a compressor fitted that levelled the car automatically. Perhaps you could get a compressor of that type from the wreckers. The fairlaine was an NA model.
AnswerID: 350742

Reply By: Member - Warfer (VIC) - Tuesday, Feb 24, 2009 at 11:21

Tuesday, Feb 24, 2009 at 11:21
***They are great BUT I'd really like an automated system where I just type in the air pressure and an on board compressor just inflates or deflates to that pressure level***

Hiya Jamo


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Cheers
AnswerID: 350744

Follow Up By: Louie the fly (SA) - Tuesday, Feb 24, 2009 at 16:11

Tuesday, Feb 24, 2009 at 16:11
Warfer, I just checked that site out for myself and I was deeply offended - no nudity anywhere! Whats going on?

Louie
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FollowupID: 619078

Reply By: Lotzi - Tuesday, Feb 24, 2009 at 12:15

Tuesday, Feb 24, 2009 at 12:15
G'day Jamohamo

You could look at fitting a height control valve as fitted to air bag systems on trucks and buses.
This would allow the bags to be inflated as the rear goes down (weight) and lets air out as the rear raises.
You would need a air tank, regulator and compressor with a pressure switch.
There is a business in Melb who have the components that you need, try google.
But as Willem says, hand pump and tyre gauge is simpler and cheaper, you don't use that much air and a simple check and top up every now and then is easier.
All the best
Lotzi
AnswerID: 350753

Reply By: Member - Phil G (SA) - Tuesday, Feb 24, 2009 at 12:28

Tuesday, Feb 24, 2009 at 12:28
If nothing automated comes along, maybe you could use a manual system and fit a pair of tyredog monitors to track the pressures.
AnswerID: 350756

Reply By: Member - Graham H (QLD) - Tuesday, Feb 24, 2009 at 14:10

Tuesday, Feb 24, 2009 at 14:10
The instructions that came with mine said to pump them up BEFORE loading up NEVER when loaded. So your proposed system may have them go BANG.







AnswerID: 350769

Reply By: Sand Man (SA) - Tuesday, Feb 24, 2009 at 16:07

Tuesday, Feb 24, 2009 at 16:07
I would be very careful of any "automated" inflation system.

The minimum pressure is 5 psi and the maximum pressure is 30 psi. Once they "blow" you are buggered.

I actually find if I leave mine at around 15psi, it suits towing the camper and is also comfortable unladen.

Bill

Bill


I'm diagonally parked in a parallel Universe!

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AnswerID: 350792

Reply By: Louie the fly (SA) - Tuesday, Feb 24, 2009 at 16:09

Tuesday, Feb 24, 2009 at 16:09
SMC (and others I'd say) make a range of digital pressure switches that have buttons to adjust the set points. They are up to a couple hundred smackers for a small one, say a panel mount style with a 1/8 BSP fitting. You also need a regulated 12 or 24V DC power source, some solenoid valves, fittings and so forth. Not sure how much you want to spend on this device but I could certainly design one. Easy as.

Louie
AnswerID: 350793

Reply By: BoldJack ( Penrith NSW) - Tuesday, Feb 24, 2009 at 22:49

Tuesday, Feb 24, 2009 at 22:49
G'Day jamohamo.
I'm sure somebody will find something wrong with this idea, however if you seem to know what range of pressures you need (5psi ---- 30psi) . Surely a simple self relieving pressure regulator, that's the type that lets air out of the system, as you dial down the pressure required, would do the job.
It could be a small one eg 1/8 fittings , as a large flow rate is not needed. should not be too hard to mount under dash or seat if worried about aesthetics as long as you can see the gauge when you adjust.
Maybe a small safety valve set at the max pressure you think you'll need, just in case it goes out of adjustment due to vibration on the track.
Cheers BoldJack.
AnswerID: 350899

Follow Up By: Member - Phil G (SA) - Wednesday, Feb 25, 2009 at 14:11

Wednesday, Feb 25, 2009 at 14:11
Boldjack,
The pressures in the airbag are not static. When you dial in 30psi at rest, it may increase to say 60 psi when you hit a ditch, or when you go around a corner etc etc So i'd expect the valves to let out air
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FollowupID: 619269

Reply By: jamohamo - Wednesday, Feb 25, 2009 at 06:47

Wednesday, Feb 25, 2009 at 06:47
Thanks for all your input guys. Pedders got back to me (they put in the Polyairs) and said that can get in a compressor that will do the job with a wireless controller that you just type the pressure into. The only hing is they've been telling me this since late last year and they say it is still a month away. Anyway, I've asked them to make sure it will go down to 5psi so I am waiting again. If that doesn't eventuate I'll look at these suggestions more closely. I'm not even sure what brand or model it is they are talking about.
AnswerID: 350922

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