Post by: brianvicki on June 06, 2021, 11:31:35 AM
Since I have used the new type where the valve is partially removed which speeds the process up, but the last time I experienced a problem with the valve leaking a bit after... it actually jammed the valve in too far and had to be fully replaced... yes my fault.. but...
I’m looking for a preset, to drop the tyres down, when towing the van on corrugated gravel roads, what is better products on the market now that you have experienced
Post by: boobook on June 06, 2021, 11:40:27 AM
https://www.youtube.com/watch?v=gWxwnuh_XTE
Instructions.
1)Set pressure - up or down - or use one of the two configurable presets ( Eg 20 PSI and 40 PSI)
2)Connect to tyre
3)Have beer, and relax till it beeps
4)Do other tyres.
These are brilliant. Jamec Pemm is top quality and they come with their individual calibration certificate.
If you shop around you can get them for around $240
Post by: glenm64 on June 06, 2021, 12:18:26 PM
They are small, reliable and there's no need to do anything else except take the dust caps off.
I couldnt be bothered with anything else.
Post by: plusnq on June 06, 2021, 12:42:35 PM
I still use Stauns. I have 2 sets actually, Stauns set at 15 psi for sand and a set of Ebay knock offs set at 28psi for gravel roads. I use the cheapies heaps and they work just fine.
They are small, reliable and there's no need to do anything else except take the dust caps off.
I couldnt be bothered with anything else.
That’s what I do as well
Post by: Bird on June 06, 2021, 02:30:57 PM
i ended up with the old Ferret deflator - removes core etc... works well for me.
https://www.youtube.com/watch?v=jmhqytzWnS0 (https://www.youtube.com/watch?v=jmhqytzWnS0)
Post by: Troopy_03 on June 06, 2021, 05:16:56 PM
Post by: lloydus67 on June 06, 2021, 05:28:25 PM
The stauns are so easy but a trap for new players. You set them up for each vehicle. 20psi on my Hilux was was 12psi on the much heavier 80series.
Sent from me
Post by: Champin on June 06, 2021, 08:15:18 PM
Sent from my SM-T700 using Tapatalk
Post by: HEM19X on June 07, 2021, 04:23:10 PM
Post by: Troopy_03 on June 08, 2021, 03:09:14 AM
I use stauns and ARB Tyre deflator plus a kings brand knock off of the same thing.
The stauns are so easy but a trap for new players. You set them up for each vehicle. 20psi on my Hilux was was 12psi on the much heavier 80series.
Sent from me
Not this old chestnut again.. LOL
You must have a different grade of air in the 80series...
Post by: Steffo1 on June 08, 2021, 07:30:28 AM
Not this old chestnut again.. LOL
You must have a different grade of air in the 80series...
Doesn't it also depend on what altitude you're at when you measure tyre pressure?
Post by: plusnq on June 08, 2021, 07:42:29 AM
Doesn't it also depend on what altitude you're at when you measure tyre pressure?
Must be a big lift on the 80 then 😂😂😂
Post by: BaseCamp on June 08, 2021, 07:48:22 AM
Then check the pressure using one of those large sized ARB tyre gauges.... (Very easy to read, and seems v. accurate)....
Tyre now sitting at about 25psi...
Dump another 10 - 15 sec worth; then done ...
My preferred pressure for sand, (FI); 18psi is reached...
I am guessing that with a tyre deflator - you use a gauge to confirm the finish pressure anyway?
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Post by: lloydus67 on June 08, 2021, 07:48:33 AM
When I changed vehicle they brought all 4 tyres to within 1 psi of each other but a much lower Tyre pressure. The only difference was the second vehicle was 3 ton 80 series with 33” tyres. Once I reset them they still worked at the desired pressure and within 1 psi of each other. You are welcome to make any thing you want of this information. However this is what I found happened. Feel free to discuss your own air but do not discount my experiences.
Post by: edz on June 08, 2021, 07:53:13 AM
You watch, now my originals will show up somewhere ..
Post by: Steffo1 on June 08, 2021, 01:44:16 PM
Must be a big lift on the 80 then 😂😂😂
;D ;D ;D ;D ;D
Post by: silverfox1111 on June 08, 2021, 02:13:01 PM
Silverfox
Post by: Troopy_03 on June 08, 2021, 02:35:36 PM
I can tell you from my experience that they are a simple mechanical device and that every time on my 2 ton hilux with 31” tyres, they never missed a beat bringing all 4 tyres down to within 1 psi of each other.
When I changed vehicle they brought all 4 tyres to within 1 psi of each other but a much lower Tyre pressure. The only difference was the second vehicle was 3 ton 80 series with 33” tyres. Once I reset them they still worked at the desired pressure and within 1 psi of each other. You are welcome to make any thing you want of this information. However this is what I found happened. Feel free to discuss your own air but do not discount my experiences.
Yep, a simple mechanical valve that pushes against a spring. The valve has a certain sized surface (fixed) and the spring sets the tension against the valve. It takes a certain amount of pressure to push the valve open against the spring, depending on the spring tension.
So there are only a couple of things that vary the pressure required to open the valve.
The size of the surface of the valve plunger - nope it's fixed
The spring tension against the plunger - nope it's fixed, once you have set it correctly.
So yes, it's a very simple mechanical device, with very little to go wrong.
What can be a bit of a trap is not tightening them down on the valve stem properly. This causes the escaping pressure to be divided between the air escaping through the valve, and the air escaping around the valve. But it will cause the staun to close sooner, because it's only seeing a portion of the total pressure. But then the air is still escaping around the Staun, so you'll probably end up dropping the pressure too low anyway.
Also, if you deflate your tyres while they are very hot, once they cool down, the pressure in the tyre will be a lot lower. Conversely, If your tyres aren't overly hot, and you drop them to a certain pressure, once you drive them partially deflated, they'll heat up and the tyre pressure will increase.
I originally set mine up for a Toyota 4Runner, then about 5? years later changed to a Troopcarrier. The pressure were always with .5 to 1 psi. A few years ago I did reset them, because one of them seemed to be dropping the tyres to 2psi difference. But since then, they work perfectly.
Post by: nab on June 10, 2021, 11:07:16 PM
Post by: del97td on June 10, 2021, 11:42:00 PM
Post by: MrHorsepower on June 11, 2021, 09:53:01 PM
Post by: edz on June 16, 2021, 11:59:22 PM
Machine work is nice and seem well made, though there is a couple of bits of the knurling that are machined off on the lock nuts [ obviously happended when they cut them from the longer piece of stock ] ..Now to see if there is enough thread on the main shaft / cap to set them at 20 PSI .
Post by: boobook on June 17, 2021, 07:34:41 AM
Post by: geopaj on June 17, 2021, 06:52:15 PM
Well the Fleabay cheapy $14 for 4 Staun knock off tyre deflators came today, Didnt realy expect them to be in seperate bags all in pieces though .. Easy enough to put together ..
Machine work is nice and seem well made, though there is a couple of bits of the knurling that are machined off on the lock nuts [ obviously happended when they cut them from the longer piece of stock ] ..Now to see if there is enough thread on the main shaft / cap to set them at 20 PSI .
I look forward to the review once assembled (please share the link with the review too).
One thing I’ve also wondered is, would they deflate quicker if the ‘air bleed hole’ on the side was enlarged by, say an extra mm??
Post by: edz on June 17, 2021, 08:33:34 PM
Have a cheapy valve removal type and an open clip on ball valve type deflator if I wanted outright speed deflating ..
Old buggered ankles and knees makes it uncomfortable to kneel / bend over each wheel in turn ..So Im going back to these, thread lock them on the PSI setting ..Screw them on, do the walk around, then once theyre down, do another walk around remove and put the caps back on .. if it takes 5 + minutes Im not worried ..
Made a cheap DIY one of these up for the fast deflates a few years ago [ bunnings bits and fleabay for the valve clipons and gauge about $50 from memory ] . https://www.youtube.com/watch?v=xMMixOGG9VU (https://www.youtube.com/watch?v=xMMixOGG9VU) ..... Fleabay site https://www.ebay.com.au/itm/294106418762 (https://www.ebay.com.au/itm/294106418762)