# tire pressure: does this exist? **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [October 19, 2007, 11:20am UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259 "2007-10-19T11:20:00Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![theblue](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/theblue/32/5074_2.png) [@theblue](https://forums.speedlife.net/u/theblue)\ **Post date:** [October 19, 2007, 11:20am UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/1 "2007-10-19T11:20:00Z")
I was thinking recently about tire pressures at track days and came up with a device. Basically, my idea is to have a second valve stem that is set to release any pressure above X psi (X = your desired hot track temp). the thought is that before you go out on track you just inflate until the release valve opens (no gauge needed). then as the tires warm up on track they bleed off air so you always hold X psi until they cool down (you’ll fill tires again before next session). the device would be 100% mechanical with some sort of adjustment ring / screw thoughts? ---
**Author:** ![jay\_g](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jay_g/32/111288_2.png) [@jay\_g](https://forums.speedlife.net/u/jay_g)\ **Post date:** [October 19, 2007, 11:29am UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/2 "2007-10-19T11:29:12Z")
kinda, they have automatic deflators that are used in the off road world. Set what psi you want the tire, screw deflator on valve stem and tire deflates to that psi. > TRAILHEAD AUTOMATIC TIRE DEFLATOR > The Trailhead Deflator allows you to easily Air down to offroad tire pressures. Simply screw the deflators on to the valve stems and air will be released until desired pressure is obtained. These are Automatic deflators pressure can easily be adjusted with included adjustment tool Automatic Tire Deflator Comparison Kit is available in two pressure ranges 5-20 lb or 15-40 lb choose kit that is in range that you normally air down to below. Kit includes Leather pouch, Four Deflators, Low pres… [http://offroadrecovery.com/c=wCxweepl0WArIXVfIHooljVUx/product/TD1/TRAILHEAD\_AUTOMATIC\_TIRE\_DEFLATOR.html](http://offroadrecovery.com/c=wCxweepl0WArIXVfIHooljVUx/product/TD1/TRAILHEAD_AUTOMATIC_TIRE_DEFLATOR.html) ---
**Author:** ![sureshot007](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sureshot007/32/7345_2.png) [@sureshot007](https://forums.speedlife.net/u/sureshot007)\ **Post date:** [October 19, 2007, 11:32am UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/3 "2007-10-19T11:32:47Z")
The counter point would be that a road compound race tire isn’t sticky until it get up to temp, so the tire being under inflated until they heat up isn’t that big of a deal. The pressure being low doesn’t affect if as much as the rubber being cold. And since you aren’t pushing the car until the temps are up, that’s why you haven’t seen this device yet. It’s a cool idea, though. ---
**Author:** ![Onyx\_Z32](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/onyx_z32/32/7581_2.png) [@Onyx\_Z32](https://forums.speedlife.net/u/Onyx_Z32)\ **Post date:** [October 19, 2007, 11:32am UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/4 "2007-10-19T11:32:50Z")
[http://www.4by4connection.com/stauntirdef.html](http://www.4by4connection.com/stauntirdef.html) ---
**Author:** ![newman](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/newman/32/7569_2.png) [@newman](https://forums.speedlife.net/u/newman)\ **Post date:** [October 19, 2007, 11:35am UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/5 "2007-10-19T11:35:03Z")
this is the worst idea i’ve ever heard ---
**Author:** ![Silver](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/silver/32/4953_2.png) [@Silver](https://forums.speedlife.net/u/Silver)\ **Post date:** [October 19, 2007, 11:36am UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/6 "2007-10-19T11:36:22Z")
> [@Onyx](#): > > [http://www.4by4connection.com/stauntirdef.html](http://www.4by4connection.com/stauntirdef.html) Don’t those just automatically deflat to a set pressure and then you remove them? Not leave them on to keep pressure at a certain level? ---
**Author:** ![newman](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/newman/32/7569_2.png) [@newman](https://forums.speedlife.net/u/newman)\ **Post date:** [October 19, 2007, 11:38am UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/7 "2007-10-19T11:38:02Z")
has anyone figured out why this is the worst idea ever, yet? ---
**Author:** ![theblue](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/theblue/32/5074_2.png) [@theblue](https://forums.speedlife.net/u/theblue)\ **Post date:** [October 19, 2007, 11:41am UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/8 "2007-10-19T11:41:26Z")
not according to the people who use them on track cars… looks like I’m not the first to think of this. from evoM: [quote=“VR4orceCJ”"] Yup… Longacre sells them… You’ll have to drill an 1/8" NPT hole in your rims and set the relief pressure. Never used them myself but know of others that do and they like them. [http://www.longacreracing.com/catalog/item.asp?id=580&catid=9](http://www.longacreracing.com/catalog/item.asp?id=580&catid=9) [/quote] how is this a bad idea… let’s hear your better idea on how to maintain tire pressure while on track? ---
**Author:** ![93dx\_hatch](https://avatars.discourse-cdn.com/v4/letter/9/90ced4/32.png) [@93dx\_hatch](https://forums.speedlife.net/u/93dx_hatch)\ **Post date:** [October 19, 2007, 11:43am UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/9 "2007-10-19T11:43:00Z")
LOL, I could just picture someone going hard into a turn an the tire pressure starts dropping ---
**Author:** ![newman](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/newman/32/7569_2.png) [@newman](https://forums.speedlife.net/u/newman)\ **Post date:** [October 19, 2007, 11:43am UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/10 "2007-10-19T11:43:32Z")
[quote=“93dx–hatch,post:9,topic:37259"”] LOL, I could just picture someone going hard into a turn an the tire pressure starts dropping [/quote] DING DING DING!!! let’s set variations in tire pressure due to thermal effects aside. you make a hard right corner. the body rolls left and weights the suspension hard on the outside, and lightens it on the inside… ready? know what happens? The tire pressure in the outside tires go WAY up. Now you bleed that air back to XXpsi. now straighten the car out. guess whose tire pressure in their left tires are WAY low?!?! But what if you hit a bump. instant pressure spike = bleed off… All aboard the failboat. ---
**Author:** ![66impalass](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/66impalass/32/7429_2.png) [@66impalass](https://forums.speedlife.net/u/66impalass)\ **Post date:** [October 19, 2007, 11:45am UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/11 "2007-10-19T11:45:44Z")
pit stops??? seriously though if one malfunctions you are fucked, also the complexity to keep a little pump in there that can re-inflate your tire once they cool down in a straight or something that involves little friction across the face of the tire to keep heat ---
**Author:** ![Blue\_Eyed\_Devil](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/blue_eyed_devil/32/7292_2.png) [@Blue\_Eyed\_Devil](https://forums.speedlife.net/u/Blue_Eyed_Devil)\ **Post date:** [October 19, 2007, 11:50am UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/12 "2007-10-19T11:50:02Z")
Electronic dwell type thing? Don’t let it just fly out, have a delay that it only lets pressure out after a pre-determined amount of time. This way short increases in pressure would not “trigger” it. This is already done on other applications. ---
**Author:** ![drvnkd](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/drvnkd/32/109615_2.png) [@drvnkd](https://forums.speedlife.net/u/drvnkd)\ **Post date:** [October 19, 2007, 11:50am UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/13 "2007-10-19T11:50:35Z")
a better Idea would be a wireless pressure sensor to relay whats going on inside your tire. then relate that to your starting pressure. ---
**Author:** ![theblue](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/theblue/32/5074_2.png) [@theblue](https://forums.speedlife.net/u/theblue)\ **Post date:** [October 19, 2007, 11:54am UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/14 "2007-10-19T11:54:11Z")
remember, this is for track days and racing only… under race conditions you’re going to build up pressure after a turn or bump almost instantly since you’re already full out. (that’s why it’s in this forum). they’re interesting looking, pretty much what I expected but thicker) ![http://www.irvansmith.com/scart/imagemagic.php?img=images/ISI/LON/LON-5000-400.jpg&w=&h=&page=popup](http://www.irvansmith.com/scart/imagemagic.php?img=images/ISI/LON/LON-5000-400.jpg&w=&h=&page=popup) ---
**Author:** ![Blue\_Eyed\_Devil](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/blue_eyed_devil/32/7292_2.png) [@Blue\_Eyed\_Devil](https://forums.speedlife.net/u/Blue_Eyed_Devil)\ **Post date:** [October 19, 2007, 11:54am UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/15 "2007-10-19T11:54:27Z")
Or… you could monitor the pressure and control the valves from the cockpit. ---
**Author:** ![Silver](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/silver/32/4953_2.png) [@Silver](https://forums.speedlife.net/u/Silver)\ **Post date:** [October 19, 2007, 11:55am UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/16 "2007-10-19T11:55:19Z")
NM, answered my own question on that one. ---
**Author:** ![MPD47](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mpd47/32/7383_2.png) [@MPD47](https://forums.speedlife.net/u/MPD47)\ **Post date:** [October 19, 2007, 11:57am UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/17 "2007-10-19T11:57:17Z")
[quote=“theblue,post:14,topic:37259"”] remember, this is for track days and racing only… under race conditions you’re going to build up pressure after a turn or bump almost instantly since you’re already full out. (that’s why it’s in this forum). [/quote] Except there are times when you are saving tire, or trying to bring temps down and not going full bore, suddenly you lose a couple PSI that you cant get back, your temps drop out of optimal range and you’re driving on pure grease. A good idea, but not one that should be applied to the real world. ---
**Author:** ![Blue\_Eyed\_Devil](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/blue_eyed_devil/32/7292_2.png) [@Blue\_Eyed\_Devil](https://forums.speedlife.net/u/Blue_Eyed_Devil)\ **Post date:** [October 19, 2007, 12:07pm UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/18 "2007-10-19T12:07:32Z")
The key is being able to add pressure back which would be heavy and complex. Maybe the hollow spoke Porsche wheels could be used as a resevoir and… Nevermind.:mamoru: ---
**Author:** ![speedracer329](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/speedracer329/32/5058_2.png) [@speedracer329](https://forums.speedlife.net/u/speedracer329)\ **Post date:** [October 19, 2007, 12:08pm UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/19 "2007-10-19T12:08:12Z")
i enjoy just keeping my pressures constant for a set, than adjusting if necessary by increasing. im talking of course about slicks, and track driving. since for track you want race temps or hot inflation pressure, whereas for other driving/street you want cold inflation pressure. id be hesitant about a mechanical pressure valve malfunctioning, theres probably a reason that lemans and such stick to 2 valve stems per rim, instead of 1 mechanical one… ---
**Author:** ![newman](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/newman/32/7569_2.png) [@newman](https://forums.speedlife.net/u/newman)\ **Post date:** [October 19, 2007, 12:46pm UTC](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259/20 "2007-10-19T12:46:42Z")
[quote=“theblue,post:14,topic:37259"”] remember, this is for track days and racing only… under race conditions you’re going to build up pressure after a turn or bump almost instantly since you’re already full out. (that’s why it’s in this forum). [/quote] what? even if air didn’t change density with heat… as you ripped around a track your tire pressure would still fluctuate wildly. [Next page](https://forums.speedlife.net/t/tire-pressure-does-this-exist/37259.md?page=2)