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Old 08-08-2018, 11:25 AM
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Negative Tire Pressure

I've heard of people running negative tire pressures on trails. How do you get your tires to negative pressures???? I've never seen proof of this, has anyone done it, or seen it??

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Old 08-08-2018, 11:32 AM   #2
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That seems difficult to attain, unnecessary, and likely to lose a bead. But...I’ll subscribe to see the responses!!!!


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Old 08-08-2018, 12:00 PM   #3
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I've heard of people running negative tire pressures on trails. How do you get your tires to negative pressures???? I've never seen proof of this, has anyone done it, or seen it??
Never heard of such a thing. Maybe you've seen the the -37 light? Which means that's the suggested inflation for the stock tire...???...???

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Old 08-08-2018, 08:17 PM   #4
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Never heard of such a thing. Maybe you've seen the the -37 light? Which means that's the suggested inflation for the stock tire...???...???


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Old 08-08-2018, 11:14 PM   #5
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From what I remember of fifth grade science, negative pressure is a vacuum.

What folks do on trails is lower their tire pressure. Sometimes to 20 lbs PSI and sometimes to 12 lbs PSI. It depends on the tire (size, tread and brand), wheel width and trail conditions (sand, mud).

I suggest going out with experienced off-roaders on trails that your Jeep is built for. Follow their advice.

Negative tire pressure might be something like "hydraulic diesel oil" or "blinker fluid".

Good Luck, L.M.
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Old 08-09-2018, 12:12 AM   #6
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I think they’re referring to filling the tires with water for improved traction when crossing rivers.
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Old 08-09-2018, 03:03 AM   #7
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Helium is even better then nitrogen, especially on water crossings. Watch going over the bridges to fast though
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Old 08-09-2018, 06:22 AM   #8
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Helium is even better then nitrogen, especially on water crossings. Watch going over the bridges to fast though
Only after 100FSW to prevent narcosis of the rubber. But now there is the Trimix and it works better than just helium to replace the inert gas.
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Old 08-09-2018, 09:36 AM   #9
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Someone could have meant a pressure lower than recommended. So any pressure lower than the baseline of 37 psi could be referred to as negative pressure in a sense.

Not one I would use, but someone might refer to it that way.

I'm going to have to try the helium in my tires. It might improve mileage when going up hills. Maybe give me help over those bigger rocks on the trails
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Old 08-09-2018, 10:31 AM   #10
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I tried filling the interior of my Jeep with helium so that I could get over the rocks easier. It made me sound like Donald Duck over the CB. One of the other Jeepers peed his pants laughing. Not a good idea for trail relationships.
Now I simply tie a balloon to each corner and sail over the rocks.

Good Luck, L.M.
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Old 08-09-2018, 12:42 PM   #11
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Quote:
Originally Posted by Luckymac View Post
From what I remember of fifth grade science, negative pressure is a vacuum.

What folks do on trails is lower their tire pressure. Sometimes to 20 lbs PSI and sometimes to 12 lbs PSI. It depends on the tire (size, tread and brand), wheel width and trail conditions (sand, mud).

I suggest going out with experienced off-roaders on trails that your Jeep is built for. Follow their advice.

Negative tire pressure might be something like "hydraulic diesel oil" or "blinker fluid".

Good Luck, L.M.
Agree with the vacuum..If you have negative pressure in your home, and light your fireplace..look out for a room full of smoke..
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Old 08-09-2018, 12:54 PM   #12
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I tried filling the interior of my Jeep with helium so that I could get over the rocks easier. It made me sound like Donald Duck over the CB. One of the other Jeepers peed his pants laughing. Not a good idea for trail relationships.
Now I simply tie a balloon to each corner and sail over the rocks.

Good Luck, L.M.
I did the same but with hydrogen.
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Old 08-09-2018, 02:12 PM   #13
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I tried filling the interior of my Jeep with helium so that I could get over the rocks easier. It made me sound like Donald Duck over the CB. One of the other Jeepers peed his pants laughing. Not a good idea for trail relationships.
Now I simply tie a balloon to each corner and sail over the rocks.

Good Luck, L.M.
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I did the same but with hydrogen.
Is the name of your Jeep "Hindenburg"?

Good Luck, L.M.
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Old 08-09-2018, 10:36 PM   #14
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Kidding aside

You get improved traction and a smoother ride when you're off road if you reduce your tire pressure. Typically you can air down to around 10 to 15 PSI with regular wheels and quit a bit lower (6 to 8 PSI) with bead lock wheels. (Bead lock wheels have a bolt on ring that fastens to the rim and keeps the tire bead in place so it doesn't pop off).

Zero PSI is as low as you can go. It means there's no air at all in the tire and it will be completely flat. A completely flat tire would be damaged quickly as the rim would slice up the tread and sidewall. If you could suck more air out with a vacuum pump and go negative (less than zero), the same thing would happen.
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Old 08-13-2018, 08:06 PM   #15
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Once you break the seal (unseat the bead) you'd not be able to hold either pressure or vacuum. Maybe if you filled them with blinker fluid...………
Also, I got a couple of bridges I'd like to sell. Give me a call
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Old 08-14-2018, 09:24 AM   #16
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I think you mean "air down"

Okay the helium/hydrogen jokes made me laugh.


As for the original question, I think you are looking for information on how to "air down" your tires. I just got into the Jeep thing a year ago and found the thread below extremely helpful. Great pictures and videos that show why it's a good idea. This technique saved my butt in deep Florida sand. Just make sure you also buy a good air compressor to pump them back up to get home. (There are air compressor threads too. Use Google to search for forum threads. For me Google has been better at finding specific topics than using the Forum's search tools.)

https://www.wranglerforum.com/f274/a...a-2071945.html
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Old 08-14-2018, 09:59 AM   #17
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When airing down, how many use the valve attachments that screw on and stop releasing air at a predetermined psi? Are they accurate?
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Old 08-14-2018, 10:34 AM   #18
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When airing down, how many use the valve attachments that screw on and stop releasing air at a predetermined psi? Are they accurate?


Here’s what you want. Gauge is built in and accurate. Brass fittings hold the valve internally while allowing massive amounts of air out. I’d guess this is at least 10 times faster than bleeding the air out while the valve is still in the stem. I ended up buying two - one for me and one for my spouse. We each do a side so we can quickly get on the trail.

https://www.amazon.com/gp/aw/d/B004L...?ie=UTF8&psc=1
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Old 08-14-2018, 11:13 AM   #19
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When airing down, how many use the valve attachments that screw on and stop releasing air at a predetermined psi? Are they accurate?


I have the Staun adjustable deflators, but I actually don’t love them. They’re only accurate within about 5-8psi and are super slow as they get close to the set pressure. And you still have to go around and drop air to where you want it anyway. I had some before that you screw on and let them sit open with air flowing out. You could check pressure as they were screwed in.

I have to say I’m liking the ARB option from mlumadue though.


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Old 08-14-2018, 12:35 PM   #20
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I have to say I’m liking the ARB option from mlumadue though.
I use the ARB deflator that mlumadue linked and I can attest to its efficiency and ease of use.
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Old 08-14-2018, 12:51 PM   #21
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We use the Teraflex tire deflators, they come with 1 for each tire so they all air down at the same time. We watch the EVIC unti it hits our desired PSI then pull them. I've used them for years on more trails than I can count. No issues. And they're cheap

https://www.amazon.com/Teraflex-4807...+tire+deflator




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Old 08-14-2018, 12:52 PM   #22
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I use the "Extreme Outback Products - Military Multi-Level Select Tire Deflator with 10-12-14-16-18-20 psi levels". They are a bit pricey at $100, but it is easy to set and repeatable.
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Old 08-14-2018, 03:18 PM   #23
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Thanks for all the replies. Lots of options, which is a good thing.
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Old 08-22-2018, 12:44 PM
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Sorry guys, I got carried away with school.. BUT, I am well aware of what airing down is, I take mine down to about 14 psi all the time with one of these. I literally mean a vaccuum pressure inside the tire. I've heard of people running 0 psi if they have a really light weight rig and can't get the tires to give much.

Well apparently no one has seen it, but how could it be done???

https://www.amazon.com/tire-Deflator...=tire+deflator
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Old 08-22-2018, 12:47 PM
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Sorry guys, I got carried away with school.. BUT, I am well aware of what airing down is, I take mine down to about 14 psi all the time with one of these. I literally mean a vaccuum pressure inside the tire. I've heard of people running 0 psi if they have a really light weight rig and can't get the tires to give much.

Well apparently no one has seen it, but how could it be done???

https://www.amazon.com/tire-Deflator...=tire+deflator

Oh and this thing usually reads about 5 psi low, which makes sense cus it never actually completely stops letting out air when you check the pressure. so I just run it down to what it says is about 10-12 psi and then do the rest with one of those typical tire pressure gauges. Takes about 5 mins to do all 4 from 33psi to 14psi
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Old 08-22-2018, 02:04 PM   #26
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If someone told me that they ran a vacuum (negative pressure) in their tires, I'd say "Show me!". I'd have to see it to believe it and even then I'd look for some deception or sleight of hand.
It simply defies what I think I know about tires.

Some jokers seem to have fun at the expense of the less experienced. Thus the terms "blinker fluid" or "sky hook". For now, I'll add "negative tire pressure" to that list.
"I've heard of people running 0 psi if they have a really light weight rig and can't get the tires to give much". The handy dandy Lucky Mac BS meter is approaching 100. I believe you, but I fear you're the victim of a sad attempt at humor.

Let me (and the rest of the forum) know if you ever find reliable proof of someone actually running "negative tire pressure".

Good Luck, L.M.
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Old 08-22-2018, 02:36 PM   #27
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There is no such thing as negative pressure, as that would imply the complete absence of any atoms or molecules. Even space has a very small pressure.
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Old 08-22-2018, 09:49 PM   #28
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With negative pressure on a gauge your tire in only being held on the rim by friction at the tire bead. Most any movement of the vehicle is going to break that contact and the seal that was there.

Just doesn't add up folks. with no pressure in the tire and the atmospheric pressure @14.7 PSI. So now you have the atmosphere trying to collapse the tire from the outside with a vacuum inside tire assisting.

OK this isn't real medicine, we're just practicing right?
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Old 08-22-2018, 10:50 PM   #29
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Negative ""pressure"" Think we are getting SUCKED in.
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Old 08-24-2018, 07:50 AM   #30
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Oh and this thing usually reads about 5 psi low, which makes sense cus it never actually completely stops letting out air when you check the pressure. so I just run it down to what it says is about 10-12 psi and then do the rest with one of those typical tire pressure gauges. Takes about 5 mins to do all 4 from 33psi to 14psi
Maybe there is a translation barrier preventing me from understanding your post. So, you use a #1 4X4 EZ tire Deflator for Large offroad tires and think that it creates a vacuum in the tires?

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