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#4488425 - 08/14/17 02:13 PM Tire pressures
Indydriver Offline


Registered: 03/20/11
Posts: 2152
Loc: 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.


Edited by Indydriver (08/14/17 02:16 PM)
_________________________
2017 Mazda CX3 1000 FF
2014 Camaro 2SS/RS LS3 Vert 13,000 M1
2012 Sienna 75,000 M1
2011 Accord VCMV6 75,000 M1
2007 Tahoe 130,000 M1 HM


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#4488433 - 08/14/17 02:25 PM Re: Tire pressures [Re: Indydriver]
skyactiv Online   content


Registered: 03/02/13
Posts: 4396
Loc: 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

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#4488437 - 08/14/17 02:29 PM Re: Tire pressures [Re: Indydriver]
shinyWheels Offline


Registered: 03/24/13
Posts: 159
Loc: CA
I usually do exactly the same as you do, 1-2 PSI above.

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#4488438 - 08/14/17 02:30 PM Re: Tire pressures [Re: Indydriver]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35861
Loc: 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 (FF)

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#4488441 - 08/14/17 02:37 PM Re: Tire pressures [Re: Indydriver]
chrisri Offline


Registered: 06/01/14
Posts: 1744
Loc: 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.
_________________________
99 FIAT Punto Sporting 16v MST 5w40
06 FIAT Stilo MW 1.9 Multijet SHU 5w40
07 Opel Vectra SW 1.9 CDTI 150 MST 5w40

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#4488470 - 08/14/17 03:20 PM Re: Tire pressures [Re: Indydriver]
BigCahuna Offline


Registered: 09/29/09
Posts: 2141
Loc: 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.,,

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#4488483 - 08/14/17 03:35 PM Re: Tire pressures [Re: BigCahuna]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35861
Loc: 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 (FF)

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#4488496 - 08/14/17 04:00 PM Re: Tire pressures [Re: Indydriver]
Superflan Offline


Registered: 04/28/15
Posts: 357
Loc: 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
_________________________
Yaris 1.0 201mkm 5W40 ACEA A3/B4
Kangoo 1.5 DCi 15W40 ACEA E7
Wife's Koleos 2.0 dCi DPF 6AT eco-map 162mkm 5W40 C3

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#4488501 - 08/14/17 04:04 PM Re: Tire pressures [Re: Indydriver]
Kuato Offline


Registered: 10/23/05
Posts: 7094
Loc: Colorado
popcorn
_________________________
Thick vs Thin test: 15k / 43k miles complete

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#4488518 - 08/14/17 04:28 PM Re: Tire pressures [Re: Indydriver]
bioburner Offline


Registered: 09/19/16
Posts: 1418
Loc: 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


Edited by bioburner (08/14/17 04:28 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

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#4488523 - 08/14/17 04:31 PM Re: Tire pressures [Re: Indydriver]
mattwithcats Offline


Registered: 06/13/13
Posts: 1659
Loc: 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...


Edited by mattwithcats (08/14/17 04:32 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)

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#4488548 - 08/14/17 05:13 PM Re: Tire pressures [Re: Indydriver]
bioburner Offline


Registered: 09/19/16
Posts: 1418
Loc: 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

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#4488619 - 08/14/17 06:31 PM Re: Tire pressures [Re: Quattro Pete]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 6159
Loc: 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)

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#4488625 - 08/14/17 06:38 PM Re: Tire pressures [Re: mattwithcats]
Wolf359 Online   content


Registered: 04/27/12
Posts: 4751
Loc: 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

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#4488643 - 08/14/17 07:00 PM Re: Tire pressures [Re: skyactiv]
oilpsi2high Offline


Registered: 12/18/14
Posts: 1325
Loc: 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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