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New fix for low tyre pressure from bmw

PranK
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PranK Grand Master

PranK

Posted
Posted

And no, this was not posted on April fools.

https://www.theautopian.com/bmw-wants-you-to-drive-with-an-air-compressor-attached-to-your-wheel/

What happens when it's not attached properly and flies off into somebody's head?

 

 

joshuaho96 Veteran

joshuaho96

Posted
Posted
2 hours ago, PranK said:

And no, this was not posted on April fools.

https://www.theautopian.com/bmw-wants-you-to-drive-with-an-air-compressor-attached-to-your-wheel/

What happens when it's not attached properly and flies off into somebody's head?

 

 

What I don't understand here is that it mentions using a sealant. So either way you're ruining the inside of the tire and making a huge mess to clean up. Why not just do that, air it back up to spec, then take it all off and put it back in the car?

Also, why not just include a plug kit that's not garbage?

MBS206 Grand Master

MBS206

Posted
Posted
2 hours ago, Duncan said:

I had never actually looked into it, but aren't onboard compressors a thing in trucks?

Yep. But typically that's just run a hose down to the tyre while stationary.

 

Oh and the Unimog will automatically air up and air down tyres from the onboard computer for you too. :)

Duncan Grand Master

Duncan

Posted
Posted
2 minutes ago, MBS206 said:

...Oh and the Unimog will automatically air up and air down tyres from the onboard computer for you too. :)

Yeah that's what I meant, permanently connected not manual

MBS206 Grand Master

MBS206

Posted
Posted
6 minutes ago, Duncan said:

Yeah that's what I meant, permanently connected not manual

I believe Unimog is the only vehicle that has it (from the manufacturer). I haven't seen aftermarket permanently connected kits, but I haven't looked either.

dbm7 Contributor

dbm7

Posted
Posted

There's actually quite a bit of aftermarket for automatic/manual tyre deflater/inflater systems ... many will have seen YT vids of trucks on tropical forest roads (read: mud), with air lines leading from the chassis/bed down to a hub piece, which in turn connects to the tyre valves ...most of the time only used on the drive axles, to adjust tyre pressures and get some grip....(bit like letting air out of a 4WD to get traction on loose dirt/sand)...

7XO6DDl.png

MBS206 Grand Master

MBS206

Posted
Posted
26 minutes ago, dbm7 said:

There's actually quite a bit of aftermarket for automatic/manual tyre deflater/inflater systems ... many will have seen YT vids of trucks on tropical forest roads (read: mud), with air lines leading from the chassis/bed down to a hub piece, which in turn connects to the tyre valves ...most of the time only used on the drive axles, to adjust tyre pressures and get some grip....(bit like letting air out of a 4WD to get traction on loose dirt/sand)...

7XO6DDl.png

Does that hose stay connected while driving? 😮

That setup wouldn't last in 4WD life, ha ha. I'm just picturing how many people would cut those hoses too if it were on a 4WD parked at Woolworths, ha ha! Yes, tHere's lots of grubs in society. :(

MBS206 Grand Master

MBS206

Posted
Posted
1 hour ago, GTSBoy said:

Hose's can't possibly stay connected from a non-rotating frame of reference that is not on the axle axis. Even if you put some slip joints into the stationary end of it, it would be 3s before it bound up and twisted itself into a pretzel.

Just went reading. They have a "rotator" air point that the line connects to. Gets mounted to the middle of the rim. And they air up and down while in motion.

GTSBoy Grand Master

GTSBoy

Posted
Posted
29 minutes ago, MBS206 said:

Just went reading. They have a "rotator" air point that the line connects to. Gets mounted to the middle of the rim. And they air up and down while in motion.

You talking about the ones in the photo above? I guess that could make sense. Fixed (but flexible) line from the point up above down to the hubcap thingo, with a rotating air seal thingo. Then fixed (but also still likely flexible) line from the "other side" of the transfer in the hub cap thingo up to the valve stem on the rim. A horrible cludge, but something that could be done.

I'd bet on the Unimog version being fed through from the back, as part of the axle assembly, without the need for the vulnerable lines out to the sides.

It's amazing what you can do when you have an idea that is not quite impossible. Nearly impossible, but not quite.

  • Like 1
dbm7 Contributor

dbm7

Posted
Posted
2 hours ago, MBS206 said:

Does that hose stay connected while driving? 😮

That setup wouldn't last in 4WD life, ha ha. I'm just picturing how many people would cut those hoses too if it were on a 4WD parked at Woolworths, ha ha! Yes, tHere's lots of grubs in society. :(

Hahaha, yeah.... not what you'd call a tamper-proof design.... but yes, with the truck setup, the lines are always connected, but typically they sit just inside the plane of the rear metal mudguards, so if you clear the guards you clear the lines as well. Not rogue 4WD tracks with tree branches and bushes everywhere, ready to hook-up an air hose. You can do it externally like a mod, but dedicated setups air-pressurize the undriven hubs, and on driven axles you can do the same thing, or pressurize the axles (lots of designs out there for this idea)... https://www.trtaustralia.com.au/traction-air-cti-system/  for example....

..the trouble I've got here... wrt the bimmer ad... is the last bit...they don't want to show it spinning, do they.... give all the illusion that things are moving...but no...and what the hell tyre profile is that?...25??? ...far kernel, rims would be dead inside 10klms on most roads around here.... 😃

MBS206 Grand Master

MBS206

Posted
Posted
42 minutes ago, GTSBoy said:

You talking about the ones in the photo above? I guess that could make sense. Fixed (but flexible) line from the point up above down to the hubcap thingo, with a rotating air seal thingo. Then fixed (but also still likely flexible) line from the "other side" of the transfer in the hub cap thingo up to the valve stem on the rim. A horrible cludge, but something that could be done.

I'd bet on the Unimog version being fed through from the back, as part of the axle assembly, without the need for the vulnerable lines out to the sides.

It's amazing what you can do when you have an idea that is not quite impossible. Nearly impossible, but not quite.

Yep, pretty much what you said is a good summary. The aftermarket thing just attached to the rim, then has two lines out to valve stems, one to inner wheel, one to outer wheel.

Some of the systems even start to air up as you head towards highway speed. IE, you're in the logging tracks, then as speeds increase it knows you're on tarmac and airs up so the driver doesn't even have to remember. I bet the ones that need driver intervention to air up end up seeing a lot more tyre wear from "forest pressures" in use on the highway!

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