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E90/E91/E92/E93 (2006 - 2013)
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Old 03-22-2013, 10:21 PM
Joe in Dublin Joe in Dublin is offline
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Michelin PSS tire pressure...?

So i put a set of pss's on my 08 e93 with 19" wheels. Michelin has no data for that car but says coupe with. 19's should be 32f 35r.... Should i bump it up a couple psi for the cab....
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Old 03-22-2013, 10:36 PM
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You can run any pressures you want to as long as you don't exceed the maximum pressure rating printed on the side of the tire. It's best for most drivers to keep any front/rear difference in pressure recommended by BMW. Aside from that, it's your call on what feels best. Just don't run lower than the door sticker recommends or higher than the max rating on the tire.

On my Nissan Murano, the recommended pressure is 33 PSI all around, but since max for my tires is 44, I run 40 because it improves handling. On my wife's 328ix I'm running about 35 front, 38 rear - which is 3 PSI higher on both ends than the door sticker calls for. We just got it and we're still trying different pressures to see what suits us best.

Experiment. Keep records. Enjoy sorting it out for yourself.
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Old 03-22-2013, 10:38 PM
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Honestly I'd start with the baseline in the owner's manual's tire pressure Ouija chart, for your style of driving and load.

I tend to either run 35s all around or 35/38 myself. I have PSSes in 18s in the sedan.
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Old 03-23-2013, 08:21 AM
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You will definately want to keep an eye on the rears. Wife had a set of Michelins put on her 328 and ran them at the recommended pressue. Within 10k miles, cords were showing in the middle.
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Old 03-23-2013, 08:27 AM
Joe in Dublin Joe in Dublin is offline
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Thing is which pressure. Bmw door sticker which applied to run flats, or michelins site.. Im runnin 35/40 now may bump to 36/42
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Old 03-23-2013, 10:07 AM
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See what the M3 is running it comes with get flats.
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Old 03-23-2013, 10:56 AM
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Quote:
Originally Posted by Joe in Dublin View Post
So i put a set of pss's on my 08 e93 with 19" wheels. Michelin has no data for that car but says coupe with. 19's should be 32f 35r.... Should i bump it up a couple psi for the cab....
I note that the '08 335i with the 19" tire option (not Cab) called for 32 psi front and 35 rear...same as yours with the 18" original tires.
The 19" OE tires were:
225/35R19 88Y (f)
255/30R19 91Y (r)

In '08 the E92, E93 with the same 18" tires carried the same psi rec: 32/35, so I don't see the need to bump your pressures unless your 19" tires are "smaller" than those shown here.

PS: RF tires have the same load carrying capacity as non-RF tires, size-for-size.
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Old 03-23-2013, 11:05 AM
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Originally Posted by Joe in Dublin View Post
Thing is which pressure. Bmw door sticker which applied to run flats, or michelins site.. Im runnin 35/40 now may bump to 36/42
BMW knows which car your tires are on, Michelin does not. Thqat makes the answer easy - start with BMW's specs...then modify as I suggested earlier.
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Old 03-23-2013, 11:11 AM
Joe in Dublin Joe in Dublin is offline
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Bmw dosent know. My car has stock 19" ers and bridgestone runflats. Im now running michelin pss go flats. 36 for the front is fine but 44 sounds high for rears.
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Old 03-23-2013, 11:12 AM
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See what the M3 is running it comes with get flats.
M3 is listed as 35/36, I run 35/35.
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Old 03-23-2013, 11:18 AM
Joe in Dublin Joe in Dublin is offline
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I just saw 08 e93 m3 with 19's is 35/38, ill run that.
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Old 03-23-2013, 11:20 AM
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Quote:
Originally Posted by Joe in Dublin View Post
Bmw dosent know. My car has stock 19" ers and bridgestone runflats. Im now running michelin pss go flats. 36 for the front is fine but 44 sounds high for rears.
If the 19" were original to your car, there's no need to adjust the BMW psi from RF to non-RF if the tire sizes are identical. At your option you may add a psi or two for handling purposes IF you perceive a handling "problem."
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Old 03-23-2013, 12:49 PM
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I just saw 08 e93 m3 with 19's is 35/38, ill run that.
Sounds like a plan, also you will not be tripping your TPMS alarm.
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Old 03-23-2013, 03:33 PM
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Originally Posted by Joe in Dublin View Post
I just saw 08 e93 m3 with 19's is 35/38, ill run that.
Joe, you may be looking at pressures for a fully laden car, with high speeds. From the 08 M3 owner's manual.
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Old 03-23-2013, 03:40 PM
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I use the 100 mph settings, minus 2 lbs. (not that I drive 100 mph very often) on my coupe..
I'll be experimenting more when I put them back on next week, but I found they handled very well set that way.
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Old 03-23-2013, 03:43 PM
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I am at 36/38 on 19" seems comfortable to me.
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Old 03-23-2013, 06:56 PM
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Quote:
Originally Posted by Joe in Dublin View Post
Bmw dosent know. My car has stock 19" ers and bridgestone runflats. Im now running michelin pss go flats. 36 for the front is fine but 44 sounds high for rears.
(Grumble grumble...smartass...) BMW knows which CAR you are driving. They put a sticker on the door frame with pressure recommendations. Those recommendations are for any tires you use on that vehicle which MATCH THE OEM size. Clear??

As I have said more than once, use those pressure recommendations as a STARTING POINT. Depart from them as suits you. If you use different size tires, the BMW recommended tire pressures still give you a place to start. BMW has tested the car and has determined that a certain pressure difference from front to rear, and certain tire pressures, result in desirable handling and ride for the OEM tires. That is your starting point. As I learned from a State Patrol driving instructor, maintaining the front-to-rear pressure difference that the manufacturer recommends is usually a good idea. Changing the difference will influence the car's tendency to understeer or oversteer.

Michelin has no idea what vehicle you will install their tires on. That's one reason the sidewall has maximum tire pressure ratings...have you ever looked for them? You can run any pressure UP TO the maximum rated on the sidewall of the tire. If that's 44 PSI and you don't want to run 44 PSI, then here's a suggestion: don't do it...run less pressure. Problem solved.

The ride quality and the handling of the car will communicate to you. As I say AGAIN, try different settings and see what works for you. If you were an autocross driver, you would already know this...because racers and autocross drivers constantly experiment with different tire pressures and offsets in pressure from front to rear.
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Old 03-23-2013, 07:10 PM
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Im actually a evoc instructor..(7 yrs). And drive as long as im over 32psi...

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Old 03-23-2013, 08:00 PM
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There is a great deal of confusion related to the "max. psi" molded onto the tire's sidewall. Regretfully, some think that this is related to the tire's operating pressure for the car.

I've seen large "chain" tire dealers that advance this myth. Unfortunately, this couldn't be further from the truth.

The "max pressure" molded onto the tire's sidewall has nothing to do with the appropriateness of the required pressure in the tire for any car. Zero...zip.

This pressure is merely a "test" pressure that the tire manufacturer has decided upon (according to regulatory tables), that their specific tire will be tested with (baseline) according to one of several international tire test procedures:

1. U.S. FMVSS 139 (NHTSA) for high speed performance, and "endurance."
2. E.U. "UNECE R30" high speed and endurance testing (now evolving).

In other words, in terms of "what's the right psi for a car," completely ignore the tire's sidewall "max psi" engraving as it has NOTHING TO DO with the car's "appropriate" psi.

Follow the "door placard pressure" when replacement tire sizes are identical.
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Old 03-24-2013, 08:34 AM
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Joe and Pointandgo, interesting information found here: http://www.eng-tips.com/viewthread.cfm?qid=161928 It's a 5-10 minute read but it starts to get at what Pointandgo alludes to. However, it does not refer to the sidewall pressure listings as "test" listings, and I don't get the sense that this is true.

OF course, this is one website and it's a discussion by engineers, any of whom can be as mistaken as any of us.

Joe, if I was too emphatic, I apologize. I was trying to make the point that tire pressures on door stickers are not commandments on stone tablets. They are however safe to use and the best single reference. I do still assert that the car manufacturer provides the best information available for tire pressures.

This is a good read that shares a similar viewpoint: http://www.modified.com/tech/0208scc...ressure_guide/ This also offers a way in which you may calculate desirable pressures for your vehicle and adjust those settings, based on recommendations from a BF Goodrich engineer.

Pointandgo's comments do correspond to the circumstance that sidewall ratings are the result of load curve calculations and government regulation that differ according to the country in question, the organization issuing them and the tire manufacturer citing them. Where that leaves us may be open to debate.

However, based on my interpretation of what I read, I don't find any reason to believe that the maximum pressure listed on the sidewall isn't a useful guide as a working maximum pressure for tires. I also find plenty of support for the position that using your own experience with the vehicle as a basis for adjusting tire pressures is a reasonable thing to do.

My observations are based on training as a State Patrol qualified driving instructor, autocrosser, and 40 years of driving experience. Some of that is probably helpful, some not.
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Old 03-24-2013, 08:54 AM
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Quote:
Originally Posted by Pilgrim View Post

My observations are based on training as a State Patrol qualified driving instructor, autocrosser, and 40 years of driving experience. Some of that is probably helpful, some not.
This will ALWAYS depend on the vehicle's dynamics and chassis setup. I found 38 psi in the rear was ridiculous on 19" 35 series tires/wheels, especially cornering ... the chance you hit a tar strip mid-corner, you'll feel it hop, with EDC set to comfort.
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Old 03-24-2013, 09:41 AM
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Try this, you can use chalk or shoe polish to make a mark that goes from the sidewall, over the shoulder, onto the tread of the tires go out & make a run like you would normally use the car. When you get back adjust the pressure to get even wear on the chalk mark. Its an old way to do it but I expect it still works better than a WAG.
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Old 03-24-2013, 01:12 PM
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Quote:
Originally Posted by Pilgrim View Post
Joe and Pointandgo, interesting information found here: http://www.eng-tips.com/viewthread.cfm?qid=161928 It's a 5-10 minute read but it starts to get at what Pointandgo alludes to. However, it does not refer to the sidewall pressure listings as "test" listings, and I don't get the sense that this is true.

OF course, this is one website and it's a discussion by engineers, any of whom can be as mistaken as any of us.

Joe, if I was too emphatic, I apologize. I was trying to make the point that tire pressures on door stickers are not commandments on stone tablets. They are however safe to use and the best single reference. I do still assert that the car manufacturer provides the best information available for tire pressures.

This is a good read that shares a similar viewpoint: http://www.modified.com/tech/0208scc...ressure_guide/ This also offers a way in which you may calculate desirable pressures for your vehicle and adjust those settings, based on recommendations from a BF Goodrich engineer.

Pointandgo's comments do correspond to the circumstance that sidewall ratings are the result of load curve calculations and government regulation that differ according to the country in question, the organization issuing them and the tire manufacturer citing them. Where that leaves us may be open to debate.

However, based on my interpretation of what I read, I don't find any reason to believe that the maximum pressure listed on the sidewall isn't a useful guide as a working maximum pressure for tires. I also find plenty of support for the position that using your own experience with the vehicle as a basis for adjusting tire pressures is a reasonable thing to do.

My observations are based on training as a State Patrol qualified driving instructor, autocrosser, and 40 years of driving experience. Some of that is probably helpful, some not.
Actually tire load/pressure standards, as well as dimensional standards are globally harmonized now (TRA U.S.), ETRTO (E.U.), JATMA (Japan) and through ongoing efforts through UNECE working groups. Tire manufacturers do not have the option of adopting their own standards.

According to NHTSA (max. permissable sidewall pressure) this may be a better explanation:

A manufacturer's selection of a maximum pressure has the effect of determining the pressures at which its tire is tested. For each permissible maximum pressure, Table II of the standard specifies pressures at which the standard's tests must be conducted. The intent of this provision is to limit the number of possible maximum inflation pressures and thereby reduce the likelihood of having tires of the same size on the same vehicle with one maximum load value but with different maximum permissible inflation pressures.

An example for test (FMVSS 109)
Table II Test Inflation Pressures, bottom of page:

http://www.gpo.gov/fdsys/pkg/CFR-201...sec571-109.xml
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Old 03-24-2013, 04:45 PM
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The post I cited earlier is dated 2006, so that unification of testing and labeling procedures evidently post-dates that period.

Quote:
Originally Posted by pointandgo View Post

A manufacturer's selection of a maximum pressure has the effect of determining the pressures at which its tire is tested. For each permissible maximum pressure, Table II of the standard specifies pressures at which the standard's tests must be conducted. The intent of this provision is to limit the number of possible maximum inflation pressures and thereby reduce the likelihood of having tires of the same size on the same vehicle with one maximum load value but with different maximum permissible inflation pressures.
They must be frustrated by BMW, then. As I understand is true of many BMW and other German cars, my wife's 09 328ix has two stickers with tire pressure instructions - one for under 100 MPH, the other for above 100 MPH.

Same size, one max load value, two different pressure recommendations. Nothing is simple to our Deutsches friends.
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Old 03-24-2013, 04:53 PM
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Originally Posted by Joe in Dublin View Post
So i put a set of pss's on my 08 e93 with 19" wheels. Michelin has no data for that car but says coupe with. 19's should be 32f 35r.... Should i bump it up a couple psi for the cab....
32 front and 35 rear is what I run and the car feels more planted to the ground from other higher psi config.

I have been running this config for over one year with perfectly even wear on the rears ie there is absolutely no signs of uneven wear on any of the tires. Within one year I have had my alignment checked and calibrated twice even though it didnt really need it.
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