What psi should i run?

TacoTRD420 · 09-10-2009, 10:37 AM

I have some 285/60/18 Nitto terra grapplers, i wanted to know what tire pressure yall would run in them. i got around 35psi in them at the time. thanks.

chris4x4 · 09-10-2009, 10:39 AM

Im running the same tires on my truck, and have found a 34 psi front, and 32 psi back gives the best wear.

luk8272 · 09-10-2009, 10:47 AM

When you get in jake swing by the house again and i'll show you the technique I use. I'm pretty sure chris used it to get his numbers. Chalk method.

chris4x4 · 09-10-2009, 10:49 AM

Quote:

Originally Posted by luk8272

When you get in jake swing by the house again and i'll show you the technique I use. I'm pretty sure chris used it to get his numbers. Chalk method.

Bingo!

TacoTRD420 · 09-10-2009, 01:07 PM

k luke...

DeeKay21 · 09-10-2009, 01:27 PM

I run 34 all around cause chris said but I might lower the back to 32psi if chris found a better way to run them?!?!

rob1 · 09-10-2009, 01:31 PM

Chris has got all the answers....another reason I wish he where my neighbor!!

How about it Chris, free beer of your choice for a year!!!

chris4x4 · 09-10-2009, 01:48 PM

Quote:

Originally Posted by WW_FIREFIGHTER

I run 34 all around cause chris said but I might lower the back to 32psi if chris found a better way to run them?!?!

I told ya to run that psi, 'cause I know you arnt gonna use the chalk method.

Quote:

Originally Posted by rob1

Chris has got all the answers....another reason I wish he where my neighbor!!

How about it Chris, free beer of your choice for a year!!!

VERY tempting......How close to the water are ya?

rob1 · 09-10-2009, 01:50 PM

South Padre Island....45 min away

chris4x4 · 09-10-2009, 01:51 PM

Quote:

Originally Posted by rob1

South Padre Island....45 min away

Hmm.......

rob1 · 09-10-2009, 01:52 PM

...laters man

ClemsonTacoma · 09-10-2009, 01:54 PM

Quote:

Originally Posted by luk8272

When you get in jake swing by the house again and i'll show you the technique I use. I'm pretty sure chris used it to get his numbers. Chalk method.

what's the Chalk Method?

chris4x4 · 09-10-2009, 01:56 PM

Quote:

Originally Posted by ClemsonTacoma

what's the Chalk Method?

http://www.automedia.com/Optimizing_...cr20010801tp/1

DanGer · 09-10-2009, 01:56 PM

Quote:

Originally Posted by ClemsonTacoma

what's the Chalk Method?

Draw a line with chalk across the tires, drive 100 yards and see the wear pattern on the tires. Then adjust inflation until it is spot on

chris4x4 · 09-10-2009, 01:58 PM

Optimizing Tire Pressure

Proper inflation puts the most rubber on the road

Jimmy Nylund / autoMedia.com

About the only positive result from the current Ford/Firestone situation is that more people are now aware that proper tire inflation pressures can be crucial. Luckily, running the correct pressure is relatively easy—but how do you know what it is? That depends on a number of factors, including vehicle weight, tire specs, air temperature and even personal preference. Newer vehicles have the manufacturer's recommended pressures on a decal in the door jam or glovebox, but those numbers are for a stock vehicle with a full load.

Air Apparent Running the correct pressure is relatively easy—but how do you know what it is?
Tires lose pressure over time, so checking the inflation at least every couple of weeks is important. While you have your tire gauge out, you might as well set them at a correct pressure for your vehicle/tire/load combination.

One simple method for finding the right pressure for your vehicle is to draw a chalk line across the tread, then drive a bit and check the line. Even wear is good, while the line fading in the center indicates over-inflation. Worst is when the chalk mark wears off at the outer edges (shoulders) first, meaning that the pressure is too low. Under-inflation lessens the tire's load capacity, can make for squirrelly handling and, most importantly, makes the tire run hotter. Hot tires tend to disintegrate, regardless of who made them. Consequently, it's better to err on the high side, even if ride quality may suffer and the tire wear pattern could be less than optimal. However, do not exceed the maximum pressure as stated on the sidewall—there can indeed be too much of a good thing.

Once the lines wear off evenly, note those pressures for future reference. While the inflation must be identical for both ends of an axle, the front tires will often require a slightly higher pressure since they usually carry more of the weight of an unladen vehicle (most engines are up front).

Gauging Pressure
It doesn't really matter how accurate your tire gauge is as long as it's consistent and you use that same one every time. Also important for repeatability is to measure the tires either cold or warm, then stick with that measurement method since tire pressure vary quite a bit with temperature. Last, but not the least, if adding load to the vehicle, don't forget to add to the tire pressures accordingly.

You'll need a piece of chalk, a tire gauge, a pen and a note pad. Make a chalk mark across the tread as pictured, on one front and one rear tire, and then drive a quarter mile or so in a straight line. Stop and study the chalk marks and note the pressure readings on the gauge.

This tire shows over-inflation, having relatively intact marks at the shoulders while the center of the line is more worn. Ideally, the chalk would have faded evenly across the tread surface. Let out some air and try again.

David Tarantino · 09-10-2009, 02:00 PM

Quote:

Originally Posted by chris4x4

I told ya to run that psi, 'cause I know you arnt gonna use the chalk method.

VERY tempting......How close to the water are ya?

just hold on chris is comeing to N.J to work for me 1st
and the water is right down the street

DeeKay21 · 09-10-2009, 02:02 PM

Quote:

Originally Posted by chris4x4

I told ya to run that psi, 'cause I know you arnt gonna use the chalk method.

VERY tempting......How close to the water are ya?

Darn straight I aint going to use the chalk method cause I don't know how to do it!!!!

ClemsonTacoma · 09-10-2009, 02:04 PM

Thanks Chris! I'm deffinetly going to have to do it if I get new tires

chris4x4 · 09-10-2009, 03:33 PM

Quote:

Originally Posted by David Tarantino

just hold on chris is comeing to N.J to work for me 1st
and the water is right down the street

Quote:

Originally Posted by WW_FIREFIGHTER

Darn straight I aint going to use the chalk method cause I don't know how to do it!!!!

LMAO!!!

Quote:

Originally Posted by ClemsonTacoma

Thanks Chris! I'm deffinetly going to have to do it if I get new tires

luk8272 · 09-10-2009, 05:00 PM

Thanks for picking up my slack chris.

09-10-2009, 10:37 AM	#1
TacoTRD420 [OP] ( . Y . ) = :) Name: Jake Joined: Jul 2009, #19918 Location: Kaplan,La. Gender: Male Posts: 266 2011 FJ T.T. 2011 Automatic Toyota FJ TT...Pretty much stock.	What psi should i run? I have some 285/60/18 Nitto terra grapplers, i wanted to know what tire pressure yall would run in them. i got around 35psi in them at the time. thanks. __________________ *"Do not go where the path may lead, go instead where there is no path and leave a trail."* 2011 FJ Team Trails... -Tinted windows- -Black Emblems-

09-10-2009, 10:39 AM	#2
chris4x4 Im not eating a spider....FUCKERS! Name: FlimFlubberJAM Joined: May 2008, #6497 Location: Tenoe, AZ Gender: Male Posts: 88,825 2013 Rubicon Unlimited, 2013 Automatic 3.6 4.10 gears, sliders, lots of buttons, and yellow flashing lights on the dash.	Im running the same tires on my truck, and have found a 34 psi front, and 32 psi back gives the best wear. __________________ I wasnt planning on going for a run, but those cops came out of nowhere!

09-10-2009, 01:07 PM	#5
TacoTRD420 [OP] ( . Y . ) = :) Name: Jake Joined: Jul 2009, #19918 Location: Kaplan,La. Gender: Male Posts: 266 2011 FJ T.T. 2011 Automatic Toyota FJ TT...Pretty much stock.	k luke... __________________ *"Do not go where the path may lead, go instead where there is no path and leave a trail."* 2011 FJ Team Trails... -Tinted windows- -Black Emblems-

09-10-2009, 01:27 PM	#6
DeeKay21 Lieutenant Dan. Joined: Nov 2008, #10651 Location: Nevada/Utah Gender: Guy Posts: 12,711 06' TRD Sport 4x4 2006 Double Cab Automatic 4.0 V6	I run 34 all around cause chris said but I might lower the back to 32psi if chris found a better way to run them?!?! __________________ DeeKay21 Front Light Bar, Step Bars & Hitch Step My Build

09-10-2009, 01:31 PM	#7
rob1 Senior Member Name: Robert Joined: Jun 2009, #18799 Location: South Texas Gender: Dude Posts: 1,813 Indigo Blue DblCab 4X4 Long Bed TRD Sport SR5 2008 Double Cab Automatic 4.0 V6 Tail gate mod, locking gas cap, locking spare tire, rear spring tsb,Weathertech Digital fit's	Chris has got all the answers....another reason I wish he where my neighbor!! How about it Chris, free beer of your choice for a year!!! __________________

09-10-2009, 01:50 PM	#9
rob1 Senior Member Name: Robert Joined: Jun 2009, #18799 Location: South Texas Gender: Dude Posts: 1,813 Indigo Blue DblCab 4X4 Long Bed TRD Sport SR5 2008 Double Cab Automatic 4.0 V6 Tail gate mod, locking gas cap, locking spare tire, rear spring tsb,Weathertech Digital fit's	South Padre Island....45 min away __________________

09-10-2009, 01:52 PM	#11
rob1 Senior Member Name: Robert Joined: Jun 2009, #18799 Location: South Texas Gender: Dude Posts: 1,813 Indigo Blue DblCab 4X4 Long Bed TRD Sport SR5 2008 Double Cab Automatic 4.0 V6 Tail gate mod, locking gas cap, locking spare tire, rear spring tsb,Weathertech Digital fit's	...laters man __________________

09-10-2009, 01:58 PM	#15
chris4x4 Im not eating a spider....FUCKERS! Name: FlimFlubberJAM Joined: May 2008, #6497 Location: Tenoe, AZ Gender: Male Posts: 88,825 2013 Rubicon Unlimited, 2013 Automatic 3.6 4.10 gears, sliders, lots of buttons, and yellow flashing lights on the dash.	Optimizing Tire Pressure Proper inflation puts the most rubber on the road Jimmy Nylund / autoMedia.com About the only positive result from the current Ford/Firestone situation is that more people are now aware that proper tire inflation pressures can be crucial. Luckily, running the correct pressure is relatively easy—but how do you know what it is? That depends on a number of factors, including vehicle weight, tire specs, air temperature and even personal preference. Newer vehicles have the manufacturer's recommended pressures on a decal in the door jam or glovebox, but those numbers are for a stock vehicle with a full load. Air Apparent Running the correct pressure is relatively easy—but how do you know what it is? Tires lose pressure over time, so checking the inflation at least every couple of weeks is important. While you have your tire gauge out, you might as well set them at a correct pressure for your vehicle/tire/load combination. One simple method for finding the right pressure for your vehicle is to draw a chalk line across the tread, then drive a bit and check the line. Even wear is good, while the line fading in the center indicates over-inflation. Worst is when the chalk mark wears off at the outer edges (shoulders) first, meaning that the pressure is too low. Under-inflation lessens the tire's load capacity, can make for squirrelly handling and, most importantly, makes the tire run hotter. Hot tires tend to disintegrate, regardless of who made them. Consequently, it's better to err on the high side, even if ride quality may suffer and the tire wear pattern could be less than optimal. However, do not exceed the maximum pressure as stated on the sidewall—there can indeed be too much of a good thing. Once the lines wear off evenly, note those pressures for future reference. While the inflation must be identical for both ends of an axle, the front tires will often require a slightly higher pressure since they usually carry more of the weight of an unladen vehicle (most engines are up front). Gauging Pressure It doesn't really matter how accurate your tire gauge is as long as it's consistent and you use that same one every time. Also important for repeatability is to measure the tires either cold or warm, then stick with that measurement method since tire pressure vary quite a bit with temperature. Last, but not the least, if adding load to the vehicle, don't forget to add to the tire pressures accordingly. You'll need a piece of chalk, a tire gauge, a pen and a note pad. Make a chalk mark across the tread as pictured, on one front and one rear tire, and then drive a quarter mile or so in a straight line. Stop and study the chalk marks and note the pressure readings on the gauge. This tire shows over-inflation, having relatively intact marks at the shoulders while the center of the line is more worn. Ideally, the chalk would have faded evenly across the tread surface. Let out some air and try again. __________________ I wasnt planning on going for a run, but those cops came out of nowhere!

09-10-2009, 02:04 PM	#18
ClemsonTacoma Senior Member Name: Cam Joined: Apr 2009, #16193 Location: Lexington, SC Gender: Dude Posts: 4,808 Tacoma 2009 Double Cab Automatic 4.0L V6 Pioneer DEH-P5100UB single din HU and black dash kit, Alpine 12" sub custom inverted box bed liner'd, various interior trim painted black, 48 blue LED domelight, cheepo floor mats, hose clamp mod, Cobra CB and knock off firestik, Stock steelie rims, with 265/75/16 Sumitomo HTR Sport A/T's	Thanks Chris! I'm deffinetly going to have to do it if I get new tires __________________

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