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  #1  
Old 05-09-2011, 07:46 AM
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Tire pressure

Why do dealerships consistently over-inflate the tires way over the recommended pressure? Do they have the right equipment? I had my free oil change done at the dealership (and some TSB's applied) a few of weeks ago and apparently they checked my tire pressure as well. I went to check my tires yesterday using my trusty mechanical gauge and all four tires read 40 psi (38 cold). The sticker on the door clearly states 33 psi cold. I wouldn't mind if it was a couple of psi's over 33, but to 38? I'll have to air them down tomorrow morning to 33-34psi cold. I was wondering why the ride felt harder then before. I just remembered they also replaced my rear shock mounts (TSB) so now I have to get my torque wrench out and check if they over-tightened the lug nuts....I might as well check all four wheels .
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Old 05-09-2011, 08:24 AM
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Re: Tire pressure

I know they are overinflated for the transport from the factory in order to keep the vehicle from moving around too much on the tie downs, so I checked my tires as soon as I got it home and they were 40 psi cold. I had to lower them to 33-34 psi cold.
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Old 05-09-2011, 08:28 AM
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Re: Tire pressure

Interesting topic! My tires are @ 40 psi as well.
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Old 05-09-2011, 08:33 AM
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Re: Tire pressure

Usually the factory over inflate (also the spare), but dealers must check and put at right pressure before the delivery to customers.
Just few dealers check the pressure...
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Old 05-09-2011, 08:55 AM
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Re: Tire pressure

Mine are all 40/41 from Dealership... is 34 psi recommended for 20"?
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Old 05-09-2011, 08:57 AM
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Re: Tire pressure

Even though the door may say 33 I highly doubt 40 is above and beyond the max psi of the tire. Your just getting a slightly harder ride it's not a safety concern.
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Old 05-09-2011, 09:02 AM
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Re: Tire pressure

I just went and verified my door and it's 36 psi cold with a max inflation rating of 51psi this is for the 20inch rim and tire.

Do you have the offeoad package?
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Old 05-09-2011, 09:09 AM
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Re: Tire pressure

I don't know much (anything) about TPMS systems. Shouldn't 40psi result in a TPMS warning?
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Old 05-09-2011, 09:15 AM
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Re: Tire pressure

TPMS is a warning system for low tire pressure and high yes. But the thresholds are 25psi and 45 psi

http://www.wjjeeps.com/tpms.htm
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Old 05-09-2011, 09:20 AM
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Re: Tire pressure

Yeah the dealer overinflated the Wrangler SilentArmors I had them install. ~38PSI each. I lowered them down to 33PSI as per the door sticker once I got my Jeep home. I took her back a few weeks after for some TSBs and they overinflated the tires again! Argh!
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Old 05-09-2011, 12:15 PM
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Re: Tire pressure

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.
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Old 05-09-2011, 12:24 PM
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Re: Tire pressure

Quote:
Originally Posted by J13ntv View Post
Even though the door may say 33 I highly doubt 40 is above and beyond the max psi of the tire. Your just getting a slightly harder ride it's not a safety concern.


.....and uneven/premature wear on the tires.
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