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F10 / F11 (2011 - Current)
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  #1  
Old 09-05-2012, 11:16 AM
kirbyj kirbyj is offline
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Tire Pressure

Over the past two years I have left tire pressure monitoring up to my BMW dealer as i always seemed to be dropping by to get some extra oil changes, replace a bubbled tire, or get a new set of wipers, etc., but yesterday my TPM system alarm went off and said that the tire pressure in my right front tire was low and, if flat, I could drive it up to fifty miles at up to 50 mph. I checked the pressure in the tire and saw that it was at 31.5 pounds. I then checked the door sticker as well as the car manual and inflated the tire up to the recommended 35 lbs.. Then I decided to check the other tires and saw that the left front tire came in at 32.5 and then I brought it up to the recommended 35. When I checked the rear tires I got a reading of 32.5 for both tires. The recommended pressure on the door panel on my sport 535xi (19 inch GY LS 2's) is 39 lbs. That seemed like a lot of lost pressure in the rears so I double checked the manual and that had a different specification of 38. It occurred to me that maybe the dealer was using an entirely different standard so I called my local dealer and sure enough, they said they put 35 all around. At this time I am running 35 all around as my dealer has recommended. Just curious what specs is everyone else running? It might be worth checking your tire pressure readings.
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  #2  
Old 09-05-2012, 11:22 AM
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chuck92116 chuck92116 is offline
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I run what the door says.

35 front/39 rear.

Unless the dealer can provide a service bulletin or other justification for running tires under-inflated, I would not trust them.

Try calling a few dealers and see if you get the same response.
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Old 09-05-2012, 11:34 AM
The X Men The X Men is offline
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If you sometimes have 3 passenger in the rear or 2 passenger with cargo such as luggage on a long trip, I would pump the rear up to 39 PSI.
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Old 09-05-2012, 11:37 AM
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Originally Posted by The X Men View Post
If you sometimes have 3 passenger in the rear or 2 passenger with cargo such as luggage on a long trip, I would pump the rear up to 39 PSI.
Or drive fast/agrressively.
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Old 09-05-2012, 12:34 PM
Gilgorm Gilgorm is offline
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Your dealer is lazy. Tires on different cars and models are all over the map. The dealer has opted to use 35 because it fits in the middle of most of the pressures. In your case, the fronts may be correct but the rears are under-inflated. Check them yourself with a good gauge when they are stone cold and use the door jamb chart. I use a small electric pump to correct any problems. With the cooler weather coming, your pressures will change anyway.
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Old 09-05-2012, 02:35 PM
kirbyj kirbyj is offline
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Quote:
Originally Posted by Gilgorm View Post
Your dealer is lazy. Tires on different cars and models are all over the map. The dealer has opted to use 35 because it fits in the middle of most of the pressures. In your case, the fronts may be correct but the rears are under-inflated. Check them yourself with a good gauge when they are stone cold and use the door jamb chart. I use a small electric pump to correct any problems. With the cooler weather coming, your pressures will change anyway.
I have an electric pump and a great digital tire pressure gauge so I am all set. I was back at the dealers today to get a brake flush, oil change, etc., and I had the service rep check again with service and they still specified 35 all around. Now after getting all this feedback I may bring the rears up to 38 (manual) or 39 (door placard.) I still think there may be others like me who have left the tire adjustments up to the dealer and may find that they are running lower pressures in the rear than the the specs dictate. I had originally thought that there might be some rationale for the dealer to use lower pressure in the rear such as softer ride, less damage to rear suspension, etc. It is hard for me to think that they put 35 in all the cars that they service.
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  #7  
Old 09-05-2012, 03:10 PM
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Tell the SA that you want the tire pressures to be set at the factory recommended values; that is, what's shown on the door jamb.
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Old 09-05-2012, 03:31 PM
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Originally Posted by HWF View Post
Tell the SA that you want the tire pressures to be set at the factory recommended values; that is, what's shown on the door jamb.
Exactly. Dealers can't keep up with every car, for every year, in different configurations. I was told multiple times by several different dealers to torque the lug nuts on the F10 to 90 ft/lbs. Guess what, It's 103 ft/lbs.
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Old 09-05-2012, 03:51 PM
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I believe the pressure numbers on the door sill are for maximum pressure -- meaning the car is fully loaded with passengers in back and front. The manual should have the correct pressure for normal driving situations with one or two people in the car.
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Old 09-05-2012, 04:03 PM
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Quote:
Originally Posted by John NY View Post
I believe the pressure numbers on the door sill are for maximum pressure -- meaning the car is fully loaded with passengers in back and front. The manual should have the correct pressure for normal driving situations with one or two people in the car.
The manual and the door say the same thing. The manual does indicate 5 people + luggage. However, there are no inflation specs for just 1 person and no cargo. It's not like I'm gonna break out the air compressor if I need to carry some people with me.
245/40/19 - 35 psi
274/35/19 - 38 psi
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Old 09-05-2012, 04:14 PM
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Quote:
Originally Posted by TJPark01 View Post
The manual and the door say the same thing. The manual does indicate 5 people + luggage. However, there are no inflation specs for just 1 person and no cargo. It's not like I'm gonna break out the air compressor if I need to carry some people with me.
245/40/19 - 35 psi
274/35/19 - 38 psi


I think for me, having the air pressure set on the high side is more about keeping the tires on the wheels at high speed rather than worrying about carrying some extra weight for a few miles.

The door placard does have higher values for speeds in excess of 100 MPH.
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Old 09-05-2012, 04:20 PM
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Originally Posted by chuck92116 View Post


I think for me, having the air pressure set on the high side is more about keeping the tires on the wheels at high speed rather than worrying about carrying some extra weight for a few miles.

The door placard does have higher values for speeds in excess of 100 MPH.
Most places that will check your tires that includes dealers, indy's and tire shops almost always jack up the tire pressure in your car, cause they figure people are too lazy/stoopid to check it and it's gonna leak out slowly anyway. Too much is better than not enough. I always recheck tire pressure and lug nut torque specs when I get home. Partially cause I don't trust anyone but mostly cause I'm an anal fcuk.
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Old 09-06-2012, 11:10 AM
kirbyj kirbyj is offline
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As I mentioned before, I had called the dealer the day before a service and had inflated all four of my tires up to their recommendation of 35 PSI. I then brought the car in for a scheduled service and out of curiosity asked the SA to double check on the recommended tire pressure. He came back and said 35 all around. OK you know all that already. Well after getting all the responses here I decided to bring my rear tires up to the door sticker recommended 39 PSI so out to the garage I go with my trusty digital gauge and electric air compressor. Unbelieveably the left rear right tire had been inflated by the dealer up to 43PSI! I had to let air out to get to the recommended 39. Right rear had 42.5, fronts had 40 and I brought them down to 35!
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  #14  
Old 09-06-2012, 12:23 PM
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I follow the specifications on the door panel which are the manufacturer's. I've discovered over the years that nothing is more accurate and better at measuring tire pressure than a good tire pressure gauge...I'm talking about the kind that attach to the valve stem and are equipped with a meter and bleed valve. Depending on where you shop, a decent one of these will run you between $15 and $25.
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Old 09-06-2012, 01:46 PM
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Quote:
Originally Posted by chuck92116 View Post
I run what the door says.

35 front/39 rear.

Unless the dealer can provide a service bulletin or other justification for running tires under-inflated, I would not trust them.

Try calling a few dealers and see if you get the same response.
Your manual will contain some alternative pressures as well as was mentioned.

I run at lower speeds and usually lightly loaded. I have no problems running the lower recommended pressures with wear, mileage, etc, and the ride is much better.

I run 33/35.
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Old 09-06-2012, 01:57 PM
jadnashuanh jadnashuanh is offline
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Note that the tire pressure changes about 1# per 10-degrees (varies some by altitude, too), so sitting in an a/c garage verses soaking in the hot sun on asphalt can change the tire pressure with the vehicle just sitting there and not having been driven.

As I understand it, the TPMS in the BMW isn't an absolute reading - after setting the correct or preferred TP, you reset the system and then it will alert you when it changes more than a certain amount. So, it could trigger at different values depending on where it was essentially zeroed. Neglecting to reset it, and you could get alerts that aren't necessarily valid - early or late.
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Old 09-06-2012, 03:51 PM
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Originally Posted by kirbyj View Post
Unbelieveably the left rear right tire had been inflated by the dealer up to 43PSI! I had to let air out to get to the recommended 39. Right rear had 42.5, fronts had 40 and I brought them down to 35!
I assume you did this on a cold tire in the morning?

Quote:
Originally Posted by Needsdecaf View Post
I run 33/35.
I tried those exact numbers, didn't seem to make any difference that I could tell with the RFT's. Maybe your butt TPMS is more accurate than mine.
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Old 09-06-2012, 04:53 PM
kirbyj kirbyj is offline
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Originally Posted by TJPark01 View Post
I assume you did this on a cold tire in the morning?.
Yes. Cold tire in garage.
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Old 09-06-2012, 05:02 PM
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Originally Posted by kirbyj View Post
Yes. Cold tire in garage.
To be honest, I have tried a bunch of tire pressures on this car on both RFT's and regular tires and they feel about the same to me from 32-45 PSI. I think it's the fact that damper control has much more of an affect on the car that, I have a hard time telling one pressure from another. That's why I just stick to the door card and call it a day.
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Old 09-06-2012, 05:04 PM
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I pump up to 40psi at all corners and refill when they get down to 37. I monitor the pressure via the tpms monitoring scrfeen which was recoded to display the pressures by DreamCar. Around 37psi the car starts feeling too soft to me.
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Old 09-06-2012, 05:30 PM
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I pump up to 40psi at all corners and refill when they get down to 37. I monitor the pressure via the tpms monitoring scrfeen which was recoded to display the pressures by DreamCar. Around 37psi the car starts feeling too soft to me.
Yes but you are Captain Insano and go to the drag-strip as well, so you may be an outlier.
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Old 09-06-2012, 07:23 PM
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Yes but you are Captain Insano and go to the drag-strip as well, so you may be an outlier.
Oops, you caught me without my mask.
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Old 09-07-2012, 03:53 PM
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I've fought with my dealer about this for years. Put the tire pressure where the German Engineers designed it to be! Period! I have a very good tire gage and a compressor at home so I'm able to check them when cold.
My new one came with Nitogen in the tires so I've been forced to go back to the dealer for adjustments. I've have had many of these cars, all with Sport Package and I can usually notice 2 or 3 PSI low just by the lack of response. It's much like the sponginess in the controls of an airplane just before the stall horn or stick shaker goes off.
After a couple of discussions with the SA I was finally able to get them to put them "at spec" and now this is probabaly the "best" driving car I've ever had.
I've checked the pressure several times since they last did them a few weeks ago and they're holding right at the door spec so maybe there is something to the Nitrogen.
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Old 09-09-2012, 01:40 PM
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Quote:
Originally Posted by TJPark01 View Post
The manual and the door say the same thing. The manual does indicate 5 people + luggage. However, there are no inflation specs for just 1 person and no cargo. It's not like I'm gonna break out the air compressor if I need to carry some people with me.
245/40/19 - 35 psi
274/35/19 - 38 psi
No need to. Here is my manual:



As you can see, for SUSTAINED driving under 100, I can carry 4 passengers AND cargo with a much lower inflation than 35/38 - 32/33 to be precise.
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Last edited by Needsdecaf; 09-09-2012 at 01:43 PM.
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Old 09-09-2012, 02:48 PM
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Originally Posted by Needsdecaf View Post
No need to. Here is my manual:

As you can see, for SUSTAINED driving under 100, I can carry 4 passengers AND cargo with a much lower inflation than 35/38 - 32/33 to be precise.
You know I think I have the same manual because I also have an early 2010 build. When you download a current manual for 2011 or 2012 they specify what the door says which is 35/38. It doesn't break it down by load. There's all sorts of confusing $hit on there. It segments it with the specification, cars with "high speed tuning feature". Seriously, WTF does that mean?
Page 242, you have to go to the BMW site to download it.
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