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  #13  
Old 05-09-2011, 12:35 PM
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Re: Tire pressure

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Originally Posted by vnbWK2 View Post
.....and uneven/premature wear on the tires.
Does your door say 33 or 36 cold? Mine says 36 which is 38 hot, mine are at 38 when hot.

Which package are you running?

i assume they don't really check the psi when they do dealer prep. We are lucky they wash it.
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  #14  
Old 05-09-2011, 12:47 PM
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Re: Tire pressure

I have the Laredo E Package with 17" wheels. The door indicates 33psi, my tires indicate 51 max psi.
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  #15  
Old 05-09-2011, 04:20 PM
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Re: Tire pressure

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Originally Posted by vnbWK2 View Post
I have the Laredo E Package with 17" wheels. The door indicates 33psi, my tires indicate 51 max psi.
Go with the door sticker, never with the max tire pressure.
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  #16  
Old 05-19-2011, 01:20 PM
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Re: Tire pressure

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Originally Posted by swampass2 View Post
I went and scoped mine out last Friday night, the night before I took delivery. There was a "reminder" sticker on at least one of the tires that mentioned deflating to spec. Next day I picked it up and all tires were at 40-41 PSI (vs. 36 per the door sticker). Looks like most dealers' prep guys are generally ignorant/careless/lazy or some combination of the 3.
Or maybe they set the pressure to a nice round number. I could care less what the dealer or shop sets my tire pressure to. It's very simple to check and just as easy to add/remove some air if needed.

I usually run a little more pressure than recommended on all of my cars and never had tire issues. I have the Jeep set to 40 PSI cold and they usually get to 43 or 44 after a drive.
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  #17  
Old 05-19-2011, 07:39 PM
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Re: Tire pressure

How accurate is the TPMS, I noticed my tires indicate 41... I'm going to have to get out my trusty tire pressure gauge.


.... update, tire gauge reads 1psi more than TPMS 42 vs 41 psi.
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  #18  
Old 05-20-2011, 02:52 AM
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Re: Tire pressure

I keep mine at 36 and no TPMS warning I've got 20 inch rims as well
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  #19  
Old 05-22-2011, 11:31 AM
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Re: Tire pressure

Upon taking ownership, I evac & installed Nitrogen. The tires were at 42psi from Dealership, I lowered to 36psi and didn't like the softer ride & handling so I moved them back up to 42psi Nitrogen.

One of the benefits of Nitrogen is much higher stability in pressures from cold to hot compared to standard air; incidentally Nitrogen is going to be a standard requirement I think beginning 2014.

Using the on-board TPMS monitor on recent trip I varied 42-47psi depending on Speed & External Temperatures. Every morning, tires were 42psi, and increases in PSI were during the highway driving.

Although, the TPMS never triggered an Over Inflate Alarm. I'm assuming the TPMS alarm is based on Static Speed and has a built-in matrix for Temps & Speed increases.
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  #20  
Old 04-23-2012, 03:54 PM
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Re: Tire pressure

Quote:
Originally Posted by J13ntv View Post
Does your door say 33 or 36 cold? Mine says 36 which is 38 hot, mine are at 38 when hot.

Which package are you running?

i assume they don't really check the psi when they do dealer prep. We are lucky they wash it.
You got a wash??? lol I took my Summit filthy. Gave in my car with a 200 dollar detail job. Should have left it dirty for them too.\

Ratbast...rds lol
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  #21  
Old 04-26-2012, 03:08 PM
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Re: Tire pressure

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Originally Posted by Dougcjohn View Post
incidentally Nitrogen is going to be a standard requirement I think beginning 2014.
I'm using the 80% Nitrogen fill mixture -- std air from my air compressor.
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Old 04-26-2012, 03:17 PM
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Re: Tire pressure

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Originally Posted by ColdCase View Post
How accurate is the TPMS, I noticed my tires indicate 41... I'm going to have to get out my trusty tire pressure gauge.
.... update, tire gauge reads 1psi more than TPMS 42 vs 41 psi.
Get a better gauge and re-check. I was all over the place with uneven fills and constantly different pressures on the EVIC until I bought a better gauge. The electronic self-calibrating gauges are more accurate than dial/pencil type gauges. Digital shows tenths and the EVIC only shows whole numbers, so a true 34.5 psi fill is indicated at "35 psi" while 34.4 psi is displayed "34 psi". That one tenth of a pound difference can make it look like a pound off what a dial/pencil gauge shows. There's no way a dial/pencil gauge is going to let you see if you're a tenth above or below a half pound rounding point.
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  #23  
Old 04-29-2012, 03:23 PM
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Re: Tire pressure

Get a big round dial gauge from some place like OG Racing. Pencil gauges are very inaccurate and basically worthless. Electric gauges have batteries. batteries die at the most inconvenient times. You can get a nice gauge for under $50 or you can spend a $180 for a gauge that is accurate to with 1/5 of 1%. Might be interesting to use one of these to verify accuracy of TPMS.

Sorry the govt need to stay out of the business of what I put in my tires. next thing you know they will be mandating you change the air in your tires every 24mos. The cost of nitrogen purges and fills are incredible and all profit. Since the air we breath is approx 80% Nitrogen the HTSA and DOT need to find something else to worry about. Yes I know all about the bennies of nitrogen and have used Nitrogen in race cars for over 30 years. At the current cost its a waste of time and money. I replace tires after al the tire compounds have been baked out by tens of thousands of heat cycles. I dont buy the tire that last the longest. I want the ones that handle and brake the best in wet and dry. I used to go through 4 tires a track weekend with BMWCCA. You also have to watch for dry rot from the outside and Nitrogen wont prevent that.
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  #24  
Old 04-29-2012, 04:22 PM
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Re: Tire pressure

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Originally Posted by BManz View Post
Get a better gauge and re-check. I was all over the place with uneven fills and constantly different pressures on the EVIC until I bought a better gauge. The electronic self-calibrating gauges are more accurate than dial/pencil type gauges. Digital shows tenths and the EVIC only shows whole numbers, so a true 34.5 psi fill is indicated at "35 psi" while 34.4 psi is displayed "34 psi". That one tenth of a pound difference can make it look like a pound off what a dial/pencil gauge shows. There's no way a dial/pencil gauge is going to let you see if you're a tenth above or below a half pound rounding point.
Ahh.. I use an accurate dial gauge.. and also a digital gauge sometimes.. don't be assuming everyone here does not know how to check tire pressure... although the last time I calibrated the dial gauge was a year ago. Even dial gauges need calibration if you want that accuracy.

BTW this is a pretty old thread someone dug up.
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