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02-14-2006, 04:35 AM
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#1
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Registered User
Join Date: Mar 2005
Location: Athens, Greece
Posts: 576
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Air pressure-chalk test done-results
Guys it is so strange. 
I did the chalk test yesterday and the result is that I have to run 22psi in my 32x11.5 BFG Mudders so that they wear even. The thing is that the ride is much better on the street too at 22psi. I started the test at 30psi going down and ending up to 22psi. I have the 4-cyl with no heavy aftermarket parts so I understand my rig is light. But isn't 22psi too low for street and highway driving?
Any comments are welcome
Thanks, Mike
sorry, sorry I just realised I posted to the wrong forum
Last edited by mic6; 02-14-2006 at 04:47 AM..
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02-14-2006, 06:52 AM
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#2
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Registered User
Join Date: Dec 2004
Location: Indy
Posts: 1,113
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That sounds a touch low, but not by a whole lot. If the ride is better and the tires wear better and the gas mileage isn't affected much, stick with it!
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02-14-2006, 07:00 AM
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#3
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Lifted/Locked/Rolled/Sunk
Join Date: Dec 2004
Location: AZ eventually...
Posts: 4,681
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That does sound low, especially for that tire size... but it could be that you need to go that low because of the lighter weight of your rig. I'd be worried about the tires overheating & causing a blow out.
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02-14-2006, 07:01 AM
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#4
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Registered User
Join Date: Mar 2004
Location: Fairfax, VA
Posts: 3,333
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I run 26 psi in mine. I tend to take corners harder so it wears evenly. Otherwise if I followed the chalk test exactly the would wear more on the edges. I would go with 24-25 psi and see what happens.
__________________
2004 Black Rubicon w/ 5 spd
RE 3.5 SuperFlex & Front Trackbar / JKS 1.25" BL & MML / 35x12.5 MTRs on 15x8 AR-23s / Currie Anti-Rock / Jeeperman Bumpers / Rokmen Sliders / York OBA / Harbor Freight 8k Winch
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02-14-2006, 08:58 AM
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#5
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Registered User
Join Date: Nov 2005
Location: Boothwyn, PA
Posts: 179
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I got 28 in mine.
__________________
2000 Sahara- RE 2" BB, JKS 1.25" BL/1"MML, 32" Kuhmo Venture MT's, XCB front bumper, Banks exhaust, 62MM TB, Flush LED's, other misc stuff
[B]Black Jeep Club #85[/B]
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02-14-2006, 10:06 AM
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#6
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Registered User
Join Date: Mar 2005
Posts: 122
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I've run 3 different sets of tires on mine and the chalk test netted different pressures for each set.
I wound up running 26psi on all of them though.
__________________
02 TJ 35" Toyo's locked both ends, winch, lift, blah blah...
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02-14-2006, 10:55 AM
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#7
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Registered User
Join Date: Dec 2004
Posts: 119
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I have a 4cyl also and I run about 20 psi in my 33" dunlop mud rovers on my daily driver. So 22 psi does not sound off to me.
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02-14-2006, 11:04 AM
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#8
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Jeep
Join Date: Jul 2004
Location: Park City, Utah
Posts: 13,188
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The 4 cylinder engine is a lighter engine, therefore the cause of less psi. As long as you are making a full print on the ground, I wouldn't worry about it.
__________________
2004 Jeep Wrangler Sport - 5 speed
Silver Metallic finish with black dual tops - Dana 44 Rear
2.25" Suspension Lift with Old Man Emu Shocks
Performance Accessories 1" Body Lift
Daystar 1" Motor Mount Lift
Spidertrax 1.25" Wheel Spacers - 32"x11.5" MT/R Tires
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02-14-2006, 11:29 AM
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#9
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Registered User
Join Date: Jan 2006
Location: Parsippany, NJ
Posts: 622
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I have 32x11.5 bfg mt's, and I had been running at 25 psi, but the edge lugs were wearing a little more then the middle lugs, so I upped it to about 26.5 psi, where I am at now. I have the 4 angry squirrels also, but I do have some extra skids, bumpers, and a whole lotta tools and a sub box adding some extra weight.
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02-14-2006, 01:01 PM
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#10
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tubework is cool...
Join Date: Nov 2003
Location: Charlotte, NC
Posts: 7,381
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Quote:
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Originally Posted by mic6
Guys it is so strange.
I did the chalk test yesterday and the result is that I have to run 22psi in my 32x11.5 BFG Mudders so that they wear even. The thing is that the ride is much better on the street too at 22psi. I started the test at 30psi going down and ending up to 22psi. I have the 4-cyl with no heavy aftermarket parts so I understand my rig is light. But isn't 22psi too low for street and highway driving?
Any comments are welcome
Thanks, Mike
sorry, sorry I just realised I posted to the wrong forum |
I'd be curious to see how the math works out on yours...
and I bet it's fairly close to 22PSI...
If I can find the BFG info online, I'll post back up...
(...and I'll move this to Tires/Wheels)...
Greg
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02-14-2006, 01:12 PM
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#11
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tubework is cool...
Join Date: Nov 2003
Location: Charlotte, NC
Posts: 7,381
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the 32x11.50x15 BFG M/T KM is listed as Max pressure of 2535@50PSI...
2535x4 = 10140
GVWR for an SE (according to Jeep.com) is 4450 lbs for your TJ...
4450/10140 = .438856
50 * .438856 = ~21.9
sounds like 22PSI is right on target for optimum tire wear...
Greg
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02-14-2006, 05:41 PM
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#12
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Registered User
Join Date: Mar 2005
Location: Athens, Greece
Posts: 576
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BigWaylon
you are an amazing guy!  
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02-14-2006, 06:01 PM
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#13
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Registered User
Join Date: Mar 2005
Location: CT
Posts: 1,215
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Im running 26 PSI all around but I am not too overly concerned because im getting rid of my 31's in another month or two
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02-14-2006, 06:55 PM
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#14
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tubework is cool...
Join Date: Nov 2003
Location: Charlotte, NC
Posts: 7,381
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Quote:
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Originally Posted by mic6
BigWaylon
you are an amazing guy! |
funny thing is...the math for mine works out to around 14PSI...and I just can't bring myself to run them that low...so I run about 18PSI on the street...and about 3PSI on the trails... 
Greg
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>
Air pressure-chalk test done-results
