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Tire pressures #4488425
08/14/17 01:13 PM
08/14/17 01:13 PM
Joined: Mar 2011
Posts: 2,198
Indiana
Indydriver Offline OP
Indydriver  Offline OP
Joined: Mar 2011
Posts: 2,198
Indiana
You learn something everyday. I'm pretty anal about tire pressures but never knew that the placard on the door jam were "max" inflations and that the OEMs actually recommended different (lower) settings for other operating conditions.

http://www.automobilemag.com/news/the-inadequate-tire-pressure-sticker/?wc_mid=4035:8240&wc_rid=4035:937951&_wcsid=46612AB0F25A85A50F23ADDAB80697BE477F24FDCE85DE35

My typical habit is to set pressures 1 or 2 psi above the placard to offset seasonal pressure losses and get best mileage on my highway vehicles.

Last edited by Indydriver; 08/14/17 01:16 PM.

2014 Camaro 2SS/RS LS3 Vert 14,000 M1
2012 Sienna 79,000 M1
2007 Tahoe 140,000 PP

Re: Tire pressures [Re: Indydriver] #4488433
08/14/17 01:25 PM
08/14/17 01:25 PM
Joined: Mar 2013
Posts: 5,030
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 5,030
The Midwest
I've seen vehicles state a higher tire pressure in the owners manual for very high speed driving that isn't listed on the door jamb. Like when driving over 100 MPH.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Wanted: 2019 Ford Ranger
Re: Tire pressures [Re: Indydriver] #4488437
08/14/17 01:29 PM
08/14/17 01:29 PM
Joined: Mar 2013
Posts: 159
CA
shinyWheels Offline
shinyWheels  Offline
Joined: Mar 2013
Posts: 159
CA
I usually do exactly the same as you do, 1-2 PSI above.

Re: Tire pressures [Re: Indydriver] #4488438
08/14/17 01:30 PM
08/14/17 01:30 PM
Joined: Oct 2002
Posts: 36,614
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline
Joined: Oct 2002
Posts: 36,614
Great Lakes
Yeah, what I'm seeing in the US is that the vehicle placard shows only the full load PSI, but not half load.

I guess car manufacturers assume that most of us are too lazy and will not adjust our tire pressures as we change loads, so they just tell us to stay at full load pressures at all times.

My old 530i actually shows both full and half load values, but that's an exception...



'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (PUP 0W-40 SRT)
Re: Tire pressures [Re: Indydriver] #4488441
08/14/17 01:37 PM
08/14/17 01:37 PM
Joined: Jun 2014
Posts: 1,750
Rijeka, EU
chrisri Offline
chrisri  Offline
Joined: Jun 2014
Posts: 1,750
Rijeka, EU
My Opel have placard with pressure settings for all tyre sizes and light load, full load in comfort and light/full in ECO settings. 2.7 Bar is front ECO settings and even then tyres look under inflated. Nose heavy diesel.


02 Nissan Terrano 2.7.TDi Motul 15w40
06 FIAT Stilo MW 1.9 Multijet SHU 5w40
07 Opel Vectra SW 1.9 CDTI 150 MST 5w40
Re: Tire pressures [Re: Indydriver] #4488470
08/14/17 02:20 PM
08/14/17 02:20 PM
Joined: Sep 2009
Posts: 2,167
Deep in the heart of Jersey
BigCahuna Offline
BigCahuna  Offline
Joined: Sep 2009
Posts: 2,167
Deep in the heart of Jersey
Those placards only apply to the tires that came on the vehicle when new. All the tires I've bought since then, have higher pressures then what the card in the door frame says. If I set them to that card, the tires look almost flat. If you have a 10 year old car, you won't be able to find the exact same cheap tire the car came with.,,

Re: Tire pressures [Re: BigCahuna] #4488483
08/14/17 02:35 PM
08/14/17 02:35 PM
Joined: Oct 2002
Posts: 36,614
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline
Joined: Oct 2002
Posts: 36,614
Great Lakes
Originally Posted By: BigCahuna
Those placards only apply to the tires that came on the vehicle when new.

If the replacement tire is the same size and same load rating index as the one on the placard, then the placard PSI still applies.

Quote:
All the tires I've bought since then, have higher pressures then what the card in the door frame says.

Just because the replacement tire has a higher max allowable PSI printed on the sidewall does not mean you should be running higher PSI in it.


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (PUP 0W-40 SRT)
Re: Tire pressures [Re: Indydriver] #4488496
08/14/17 03:00 PM
08/14/17 03:00 PM
Joined: Apr 2015
Posts: 422
Reunion Island
Superflan Offline
Superflan  Offline
Joined: Apr 2015
Posts: 422
Reunion Island
Wife's Koleos pressure sticker rates 2.2 bar in front tires, 2.0 rear. For a correct behavior, many drivers including me sets them at 2.7 front, 2.4 rear. If not, ride seems ok but wear is concentrated on borders of the tread. 10000 kilometers max on stock tire pressure, 40000 at 2.7/2.4


Peugeot Partner 1.9 D, 5W40 C3, 245000 Km, running on WVO
Wife's Mitsubishi Outlander PHEV, dealerís overfilled, 16000 Km
Re: Tire pressures [Re: Indydriver] #4488501
08/14/17 03:04 PM
08/14/17 03:04 PM
Joined: Oct 2005
Posts: 7,094
Colorado
Kuato Offline
Kuato  Offline
Joined: Oct 2005
Posts: 7,094
Colorado
popcorn


Thick vs Thin test: 15k / 43k miles complete
Re: Tire pressures [Re: Indydriver] #4488518
08/14/17 03:28 PM
08/14/17 03:28 PM
Joined: Sep 2016
Posts: 1,418
Minnesota
bioburner Offline
bioburner  Offline
Joined: Sep 2016
Posts: 1,418
Minnesota
Pretty sure the door jamb pressures are wrong for my 99 Ford dually. 45psi. Local tire shop said thats nuts and I agree. Drop on the 5th wheel and things would probably get interesting fairly soon. Front are 65psi with the 7.3 upfront

Last edited by bioburner; 08/14/17 03:28 PM.


97 Ford E350 D,99 F350 dually D
13 Scion Xb
12 Ford Transit Connect
06 Nissan Xterra
03 K1200 BMW
07 Kawasaki KLR650
13 Madass
Re: Tire pressures [Re: Indydriver] #4488523
08/14/17 03:31 PM
08/14/17 03:31 PM
Joined: Jun 2013
Posts: 1,764
Virginia
mattwithcats Offline
mattwithcats  Offline
Joined: Jun 2013
Posts: 1,764
Virginia
Max pressure is actually on the tire sidewall,
The door placard is for max ride comfort...

My '02 Saturn came with "T" speed rated, 35 psi max (250 kpa), 185/65R15
I currently have "H" speed rated, 51 psi max (350kpa), 205/60R15's..

Door says 26 psi...

I put 44 in...

Last edited by mattwithcats; 08/14/17 03:32 PM.

2009 Smart Pure
Pennzoil Platinum Euro 0W-40, Purolator Synthetic PSL 14610, 45 mpg...
185/55R15 General HP tires, "H" speed rated, 44 psi (300 kpa)
Re: Tire pressures [Re: Indydriver] #4488548
08/14/17 04:13 PM
08/14/17 04:13 PM
Joined: Sep 2016
Posts: 1,418
Minnesota
bioburner Offline
bioburner  Offline
Joined: Sep 2016
Posts: 1,418
Minnesota
FedEx trucks were running the trailer tires at max sidewall and a fleet study showed that they were blowing far more tires than running at just 5lbs under. Now FedEx rarely get a fully loaded truck delivering packages.



97 Ford E350 D,99 F350 dually D
13 Scion Xb
12 Ford Transit Connect
06 Nissan Xterra
03 K1200 BMW
07 Kawasaki KLR650
13 Madass
Re: Tire pressures [Re: Quattro Pete] #4488619
08/14/17 05:31 PM
08/14/17 05:31 PM
Joined: Mar 2008
Posts: 7,319
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 7,319
USA
Originally Posted By: Quattro Pete
Yeah, what I'm seeing in the US is that the vehicle placard shows only the full load PSI, but not half load.

I guess car manufacturers assume that most of us are too lazy and will not adjust our tire pressures as we change loads, so they just tell us to stay at full load pressures at all times.

My old 530i actually shows both full and half load values, but that's an exception...




My 96 ES300 had a placard like that.
The full load setting was 32 psi (fully loaded to max weight limit)
The half load setting was 26 psi (up to 4 passengers)

Re: Tire pressures [Re: mattwithcats] #4488625
08/14/17 05:38 PM
08/14/17 05:38 PM
Joined: Apr 2012
Posts: 5,579
MA
Wolf359 Offline
Wolf359  Offline
Joined: Apr 2012
Posts: 5,579
MA
Originally Posted By: mattwithcats
Max pressure is actually on the tire sidewall,
The door placard is for max ride comfort...

My '02 Saturn came with "T" speed rated, 35 psi max (250 kpa), 185/65R15
I currently have "H" speed rated, 51 psi max (350kpa), 205/60R15's..

Door says 26 psi...

I put 44 in...


This comes up all the time. Search the old threads. Should probably have a thread for common car myths that people believe. The consensus in the other threads is that you go by the what the car manufacturer recommends. Those numbers are for ride comfort and max recommended pressure for the car. I wouldn't exceed it by more than a couple PSI, otherwise the car probably rides like rocks. The car manufacturer knows the design of the car and knows the suspension components that went into it. The tire manufacturer has no idea what car it's going on, the pressure could be higher or lower, they just know that their design is only good for a max of a certain tire pressure, but they have no idea about handling and how the suspension is set up for tire wear.

All you guys have to do is search and you'll find that everyone says to go by vehicle manufacturer recommendation.

https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=147

Re: Tire pressures [Re: skyactiv] #4488643
08/14/17 06:00 PM
08/14/17 06:00 PM
Joined: Dec 2014
Posts: 1,526
NY, USA, etc.
oilpsi2high Offline
oilpsi2high  Offline
Joined: Dec 2014
Posts: 1,526
NY, USA, etc.
Originally Posted By: skyactiv
I've seen vehicles state a higher tire pressure in the owners manual for very high speed driving that isn't listed on the door jamb. Like when driving over 100 MPH.


My Cobalt SS owners manual says this. 32psi normal, 35 for extended periods at 100+

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