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F30 / F31 / F32 / F33 (2012 - current)
The sixth generation 3 series, chassis code F30. 2013 model year 328i and 335i sedans now in production. Read the F30 frequently asked question thread for all your basic question and dive into all the details in the ultimate F30 information thread.

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  #1  
Old 07-23-2013, 10:23 AM
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chasfh chasfh is offline
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Tire Pressure Question

I have P225/50R17 94v tires.

My TPM went off, although it did not indicate which tire might have the problem. It is asking me to reset it.

I checked the tire pressure and all four tires appear to be in the 36-38 range.

What I am confused about is what the tire pressure should be. The tire itself indicates a max of 51. However, the manual indicates that for this tire, the pressure should be 32, although there is a picture of four adults + luggage next to it. I guess that means the tire pressure for a full load of people and things. I usually drive around with only 175-pound me, and sometimes me and my 100-pound wife.

Does anyone have a feel for what the ideal tire pressure should be?
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  #2  
Old 07-23-2013, 10:42 AM
hans007 hans007 is offline
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it should be on the sticker near the door.

on my car its 32 for all tires but i have an m-sport with the 18s. i had to reset and fill a tire the other day so i did this same thing myself like you did... one tire was about 2 PSI low.
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  #3  
Old 07-23-2013, 11:02 AM
EstorilF30 EstorilF30 is offline
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Do RFT require much lower PSI?

My E46 with sports package could take up to 40 PSI and that's usually where I left it.
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  #4  
Old 07-23-2013, 11:13 AM
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tturedraider tturedraider is offline
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Go with what the door placard calls for plus two psi. If all the tires are set properly just reset the warning. Air pressure should be checked monthly. Most people aren't that diligent, including me. I try to check it at least every couple of months. Just a few pounds low adversely affects tire wear, gas mileage, and handling.

I'm pretty positive the car can be "coded" to display individual tire pressures. I'm not sure who in Chicagoland does it, but I'm sure there are indies who do. I'll bet if you post that question on the Windy City BMW CCA chapter Facebook page you'll get some recommendations.
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Last edited by tturedraider; 07-23-2013 at 11:17 AM.
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  #5  
Old 07-23-2013, 12:55 PM
hans007 hans007 is offline
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Quote:
Originally Posted by tturedraider View Post
Go with what the door placard calls for plus two psi. If all the tires are set properly just reset the warning. Air pressure should be checked monthly. Most people aren't that diligent, including me. I try to check it at least every couple of months. Just a few pounds low adversely affects tire wear, gas mileage, and handling.

I'm pretty positive the car can be "coded" to display individual tire pressures. I'm not sure who in Chicagoland does it, but I'm sure there are indies who do. I'll bet if you post that question on the Windy City BMW CCA chapter Facebook page you'll get some recommendations.
yeah it defniitely can be coded. i dont get why it just isnt that way from the start. i guess BMW thinks most people dont need to be told the exact PSI
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  #6  
Old 07-23-2013, 01:13 PM
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chasfh chasfh is offline
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Thanks for the tips, guys!
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  #7  
Old 07-23-2013, 03:33 PM
lewes2 lewes2 is offline
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Yep, had our f30 coded to show both tire pressure and temp for each tire. Running temp in the current hot weather is about 109 in the front and two degress less in the rear. Pressure is between 38 and 39 psi. Interestingly, coming home from work In the afternoon, the temps on the sunny side of the car about 4 degrees higher. Sensors appear to be pretty sensitive.

And of course iDrive let's you set units, e.g., bar, psi, c. F. Etc.

Last edited by lewes2; 07-23-2013 at 03:37 PM.
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  #8  
Old 07-23-2013, 03:57 PM
fb88 fb88 is offline
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Where did you get it coded and how much? Would an software update from dealer wipe it out?
Reporting false TPM alert is bad, forcing driver to pull off the road and check for pressure only to discover it was a false alarm. It happened to me a few times in E90. It would have been a lot safer to display each tire's psi.
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  #9  
Old 07-23-2013, 04:09 PM
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AndDown AndDown is offline
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Same warning came on for me last Winter - the outside temp dropped significantly one night, car was parked outside. Apparently, the difference in temp. was enough to lower the tire pressures on all four tires. This also happened to my daughter and her friend driving an E92 when she recently visited SF. The temp in Sacramento (where they were staying) was over a 100 degrees but in SF it had dropped to high 60's during the night - difference in outdoor temp was the cause.
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  #10  
Old 07-23-2013, 04:10 PM
lewes2 lewes2 is offline
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John Hodges http://www.dcmetrocoding.com/
did the coding for me while he and his family were vacationing at the Delaware beach. His website has descriptions and prices. Plus, John is a very pleasant and methodical person.
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  #11  
Old 07-24-2013, 09:51 PM
Stelvio Stelvio is offline
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Just a comment on tire pressures - My '12 335i Sport has always under-steered even on the gentle bends of LA freeways. For the record, I've always run my tires on most cars around +2psi. I also know that raising the front pressures will decrease understeer, but if you stack that on top of already-high pressures you'll soon be way out of sorts. I recently tried something that seems to be working - I just set the rears at what the door placard says (36), and raised the fronts to 34; seems to be much more neutral at this point (18" Conti Run-flats, but who knows for how much longer). Cheers

Last edited by Stelvio; 07-24-2013 at 09:52 PM. Reason: spelling
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