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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 08-29-2013, 06:51 PM
moomber moomber is offline
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E93 - dealer set tire pressure - is this way off ?

I have an E93 with sports package, 18" rims.
After a service, dealer set my tire pressure to 42/50 psi , is that way off ?
While I understand dealers tend to over inflate, this seems strange.

any feedback is appreciated.

Thanks!
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  #2  
Old 08-29-2013, 07:18 PM
heresy_fnord heresy_fnord is offline
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Just about any place I've gone and had tires put on over inflates my tires at least a little bit. I don't think it's model specific either as I've had it with non-BMWs as well. I always wait until the next morning when I know the tires are at a normal "cold" temperature for the season and then I check them and inflate or deflate them to whatever the spec is listed on the sticker inside the door.
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Old 08-29-2013, 07:25 PM
ctuna ctuna is online now
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Did you measure that cold

Did you measure that cold
Because tires will measure at least 5 psi more after there hot from driving.
There is a plaque on the side of the drivers door that tells you what it should be
assuming you have the same tire setup the car came with.

Last edited by ctuna; 08-29-2013 at 07:27 PM.
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  #4  
Old 08-29-2013, 07:34 PM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by moomber View Post
I have an E93 with sports package, 18" rims.
After a service, dealer set my tire pressure to 42/50 psi , is that way off ?
While I understand dealers tend to over inflate, this seems strange.

Overinflation makes your ride seem newly responsive....at first....when it's picked up after service. You smile.

Then, tires heat up. It's too much! Gets harsh.

I'm 34-35 psi - works rather well. BMW did good re: owners manual recommendations - you should look up your setup!
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Old 08-29-2013, 07:41 PM
moomber moomber is offline
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thanks for all the comments. I'll certainly check it again in the morning.

Another puzzling thing is that recommended pressure in the manual vs sticker near driver's side door are different. Which one would be the right one ?
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Old 08-29-2013, 09:14 PM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by moomber View Post
thanks for all the comments. I'll certainly check it again in the morning.

Another puzzling thing is that recommended pressure in the manual vs sticker near driver's side door are different. Which one would be the right one ?

Depends on tires + intended use/speed. Look sharp - might find door recommendation in the manual among the many possibilities.
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Old 08-29-2013, 09:19 PM
ctuna ctuna is online now
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I think the manual list a couple of settings.

I think the manual lists a couple of settings.
Fully loaded and lightly loaded.
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Old 08-29-2013, 10:16 PM
Bigrob126 Bigrob126 is offline
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If your tires were rotated, you may want to check the lug torque as well. Almost always over tightened!
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Old 08-30-2013, 05:18 AM
hondo402000 hondo402000 is online now
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The tires will also have the psi on them. But not car specific
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Old 08-30-2013, 06:30 AM
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need4speed need4speed is offline
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I think the door says 34/42. I tend to like running them a little closer to 36/44. N4S
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Old 08-30-2013, 08:28 AM
moomber moomber is offline
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just to illutrate how confusing this is:

1. Manual has two settings, one for <= 100mph and one for > 100mph
2. Door has two stickers, one for <=100mph (yellow), and one (white) for unspecified speed (assuming general)
3. after a service appt, dealer set it to - 45/50 (!)

and they are all different!

I settled on cold pressure of 36/40 .. don't ask me why ..

thanks for all inputs!

Last edited by moomber; 08-30-2013 at 08:31 AM.
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  #12  
Old 08-30-2013, 10:19 AM
Watchme Watchme is offline
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Quote:
Originally Posted by ctuna View Post
Did you measure that cold
Because tires will measure at least 5 psi more after there hot from driving.
There is a plaque on the side of the drivers door that tells you what it should be
assuming you have the same tire setup the car came with.
Nah brah....http://www.tirerack.com/tires/tirete....jsp?techid=73

Quote:
Additionally, the difference between cold nighttime temperatures and hot daytime temperatures in most parts of the country is about 20 Fahrenheit. This means that after setting tire pressures first thing in the morning, the vehicle's tire pressures will be almost 2 psi higher when measured in the afternoon (if the vehicle was parked in the shade). While that is expected, the problem is when you set your vehicle's tire pressures in the heat of the day, their cold pressures will probably be 2 psi low the following morning.
I would go with owner's manual recommendation.
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Old 08-30-2013, 10:50 AM
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The owner's manual and the door jam sticker will match (cold psi) for either the above or below 100 mph recommendations.

The (max) psi shown on the tire's sidewall has nothing to do with recommended psi for the car.
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Old 08-30-2013, 11:14 AM
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Nordic_Kat Nordic_Kat is offline
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Setting pressures high is unheard of at my dealership. The only number their gauges seem to work at is 32 psi.

For the record, my E93's door jamb placard states 33/41 front/rear and behaves best when set at the stated settings.
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Old 08-30-2013, 12:33 PM
dpritchett dpritchett is online now
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Quote:
Originally Posted by Nordic_Kat View Post
Setting pressures high is unheard of at my dealership. The only number their gauges seem to work at is 32 psi.

For the record, my E93's door jamb placard states 33/41 front/rear and behaves best when set at the stated settings.
They've never set mine to the pressures on the door sticker. I always have to adjust. I'm lucky if they reset the TPMS
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Old 08-31-2013, 07:45 PM
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With the Sports Package staggered 18s, I go with the manual recommended 35F/42R cold. Handling/ride/wear are all very good.
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Old 08-31-2013, 08:29 PM
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Quote:
Originally Posted by Nordic_Kat View Post
Setting pressures high is unheard of at my dealership. The only number their gauges seem to work at is 32 psi.

For the record, my E93's door jamb placard states 33/41 front/rear and behaves best when set at the stated settings.
Nothing like the dealership ignoring or trying to out-guess what about 80 BMW engineers, test track drivers, lab test results, (and min. fed. regulations), have already determined to be "optimal" handling characteristics for our car(s).

Then again there are always those who "know better" based on...?
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  #18  
Old 08-31-2013, 08:56 PM
Pilgrim Pilgrim is offline
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Here's the deal with tire pressures.

The manufacturer's door label gives you a good starting point, and those pressures work for most people. But they're not the only answer, as any autocrosser or patrolman can tell you.

The tire pressures listed on the tires are MAXIMUMS - got it? You can run ANY pressure you want up to that maximum, and the tire should respond and behave correctly because you're operating within its design limits.

Your door label usually lists a front/rear difference, like 32 front/35 rear. That's a 3 PSI difference. For your driving, as long as you maintain that pressure difference, you can run any dang pressures you want between what's listed and the tire maximum.

Example: your label says 32/35. Your tires are marked 44 PSI maximum.

You can run 32/35, 34/37, 38/41, 40/43, 41/44....or any other variation with a 3 PSI difference. What matters is staying within the maximum PSI rating on the top end, and how the tires feel and behave to you. If running higher pressures than the label suggests is too harsh, then don't do it. OTOH, if higher pressures feel great and improve handling, use them. You're a sentient being - sort it out for yourself.

In my 280ZX Turbo, max pressure is 44 PSI and I usually run 40 PSI all around. In my Nissan Murano, the manufacturer suggests 34 PSI all around, but I run 39 to 40. It improves handling and doesn't compromise the ride enough to be a problem.

This is the system I learned from the State Patrol while becoming a police driving instructor. I have used it for years on a wide variety of cars with no problems.

For non-street driving such as autocrossing, a different set of rules apply but I won't go into that.
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Last edited by Pilgrim; 08-31-2013 at 09:00 PM.
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