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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 04-18-2013, 12:20 PM
rmnelson12 rmnelson12 is offline
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Question Tire Pressure with New Non-Run-flats PSS

Just mounted and balanced some new Non Run Flat Michelin PSS to replace the stock Run Flats. The ride is great, I love em. But the tire pressure in the fronts are 45 and rears 48~.

NRFT or not, should the tire pressures still match does on the door frame and manual spec? OR do these tires require a different, higher tire pressure (PSI)?

Thanks
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  #2  
Old 04-18-2013, 12:23 PM
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Two answers 1.Yes the door sticker is what most recommend you use. 2. That being said the M3 which has get flats the door sticker is about 5-6psi lower IIRC.
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  #3  
Old 04-18-2013, 12:27 PM
rmnelson12 rmnelson12 is offline
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Roger that, sounds good, I'll keep em at the door PSI levels MAX.
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  #4  
Old 04-18-2013, 12:45 PM
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Running the max tire psi from the door sticker will give you a rougher ride, but will perform better!
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Old 04-18-2013, 02:49 PM
Joe in Dublin Joe in Dublin is offline
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Im running m3 pressure. I ran a post about this awhile ago and got alot of info. But your door sticker is for run flats. They are different. You now have a m3 set up...
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Old 04-18-2013, 02:53 PM
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Not a tire manufacturer mind you but, Run flats are much stiffer sidewalls. So, running a higher pressure on the "go flats" would better approximate the run flat behaivor. Like i say, just thinking outside the box. I switched to PSS about a montha go and running 37 on front and 43 on back per the door sill sticker. Not at max P but close.

I have sport package.
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Old 04-18-2013, 02:54 PM
rmnelson12 rmnelson12 is offline
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http://www.bimmerfest.com/forums/sho...d.php?t=684414

Whats the m3 tire pressures did you end up using for your e93?
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Old 04-18-2013, 03:12 PM
Joe in Dublin Joe in Dublin is offline
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My theory is... The run flats have a plastic ring in the side wall to prop up tire when its flat. They have u put alot of pressure in the rears to prevent that ring digging into to bottom of the tire due to higher negative camber on bmw rear tires
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  #9  
Old 04-18-2013, 03:32 PM
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45/48 is insane ... I'd lose my teeth. You'd be fine with 35/36 +/- 1 PSI
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Old 04-18-2013, 05:21 PM
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Quote:
Originally Posted by rmnelson12 View Post
Just mounted and balanced some new Non Run Flat Michelin PSS to replace the stock Run Flats. The ride is great, I love em. But the tire pressure in the fronts are 45 and rears 48~.

NRFT or not, should the tire pressures still match does on the door frame and manual spec? OR do these tires require a different, higher tire pressure (PSI)?

Thanks
If you have the exact same size as the original tires, yes you should go with the door (BMW) recommended air pressure. RF and non-RF (size for size) do not have different air pressure requirements according to U.S. or E.U. tire load/inflation standards.
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Old 04-18-2013, 05:28 PM
Joe in Dublin Joe in Dublin is offline
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Then why does the m3 have different pressure settings. Same size tire...
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Old 04-18-2013, 05:32 PM
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Originally Posted by Joe in Dublin View Post
Then why does the m3 have different pressure settings. Same size tire...
You're talking about front to back difference? There may be various reasons why BMW wants this such as to impart a certain amount of understeer in the car, or to accomodate axle weight differences, etc.
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Old 04-18-2013, 05:46 PM
Joe in Dublin Joe in Dublin is offline
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M3 36f 38r, 335i 36f 44r. Both 08 both cabs, same tire size just run flat vs go flat. U cant tell me the m3 is hundreds of pounds lighter than 335. Its because of the different tires. Over inflate rears on 335 to prevent run flats from destroying themselves.
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Old 04-18-2013, 06:11 PM
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Quote:
Originally Posted by Joe in Dublin View Post
M3 36f 38r, 335i 36f 44r. Both 08 both cabs, same tire size just run flat vs go flat. U cant tell me the m3 is hundreds of pounds lighter than 335. Its because of the different tires. Over inflate rears on 335 to prevent run flats from destroying themselves.
Joe, I can only recommend to not be fixated on the M3 pressures. Nothing to do with the 335i, and I'm not sure why you're trying to relate the two.

See my previous post...
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Old 04-18-2013, 06:50 PM
Joe in Dublin Joe in Dublin is offline
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Actually the m3 and 335 are very simliar. Same weight same balance and now same tires.
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Old 04-18-2013, 07:36 PM
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45/48 is insane ... I'd lose my teeth. You'd be fine with 35/36 +/- 1 PSI
I'm with you!
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Old 04-18-2013, 07:41 PM
rmnelson12 rmnelson12 is offline
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im running 41 / 44, since highway driving in texas is usually around 90 to 100
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  #18  
Old 04-18-2013, 08:12 PM
sptt144 sptt144 is offline
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I need to get new tires and all I want to know is if it made that much of a difference with the non run-flats without suspension change out?
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Old 04-18-2013, 08:20 PM
Michael Schott Michael Schott is offline
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Quote:
Originally Posted by rmnelson12 View Post
im running 41 / 44, since highway driving in texas is usually around 90 to 100
Wow, in the parts of Texas I've driven (Dallas to San Antonio on I-35) and from Houston to Dallas (forget the interstate), and I-10 from Houston to SA, those speeds would put you in jail.
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Old 04-18-2013, 08:24 PM
rmnelson12 rmnelson12 is offline
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not when the speed limit is 85
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  #21  
Old 04-18-2013, 10:53 PM
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Tire Pressure with New Non-Run-flats PSS

Quote:
Originally Posted by Joe in Dublin View Post
Actually the m3 and 335 are very simliar. Same weight same balance and now same tires.
Different suspension setup. Stiffer dampers springs bushings alignment all contribute to handling differences. 38 psi in my M3 is nightmarish on public roadways.


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  #22  
Old 04-19-2013, 08:44 AM
Spagolli94 Spagolli94 is offline
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I have the same tires and run what's suggested in the door jam. I have an E90 335i with sport pkg and it says 33/41. Seems like a weird pressure, but the car rides nice and handles well.
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  #23  
Old 04-19-2013, 10:54 AM
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Quote:
Originally Posted by rmnelson12 View Post
im running 41 / 44, since highway driving in texas is usually around 90 to 100
If you have Michelin PSS, you better watch out and test your tire pressure after high speed run immediately. I've gotten 10 psi pressure increase from cold to hot after 30 min on a racetrack. That would bring your tires to 51 and 54 psi. Problem? Max allowed on OEM Potenzas was 60 psi, but for PSS max is 50 psi. I would disregard door recommendations for high speed inflation if you are running non run flats, more specifically Michelin PSS.

I run PSS at 36 front and 39 psi rear.
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  #24  
Old 04-19-2013, 11:18 AM
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I found the M3 rates much better all round than the 335is door sticker with no adverse tire wear.
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  #25  
Old 04-19-2013, 01:25 PM
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Originally Posted by bear-avhistory View Post
I found the M3 rates much better all round than the 335is door sticker with no adverse tire wear.
Which is what? And is this 18 or 19 wheels?

Thx
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