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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > hyper inflating tires



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      05-10-2008, 04:30 PM   #1
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hyper inflating tires

anyone do it? I started doing 45 in front 50 in back. Could this be in any way detrimental to the tire or its longevity?
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      05-10-2008, 04:33 PM   #2
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Quote:
Originally Posted by SJNESH View Post
anyone do it? I started doing 45 in front 50 in back. Could this be in any way detrimental to the tire or its longevity?
I run 43F / 45R cold tire pressure

If you dont mind a bit harsher ride there is no problem runing that pressure, its still way below the 50 Max cold psi (assuming you have non-rft)

Underinflating causes increased tire wear, poor gas mileage, and less protection for your wheels.
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      05-10-2008, 04:36 PM   #3
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Personally I wouldn't do it...especially if you have run flats. The tires will become much more susceptible to potholes and will bubble up easier.
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      05-10-2008, 04:54 PM   #4
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Other than causing more wear in the center section, I doubt you'll have issues running them within the manufacturer's recommended psi range.

The ride will certainly be harsh, and the car will be more unsettled on rough roads.

I run 42 at the track (prevents rolling the sidewall), but 32/36 for regular driving
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      05-10-2008, 04:54 PM   #5
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I used too over inflate my tires on my C230 and its would wear harsh in the center of the tire
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      05-10-2008, 05:02 PM   #6
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unless you want uneven wear on your tires.
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      05-10-2008, 05:03 PM   #7
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I overinflated my tires for a while to around 38psi but I noticed my cornering suffered alot from the lack of a contact patch.

The guys at Discount Tire told me that my 18in rims would be more protected from bending by running higher tire pressure (non RFTs)
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      05-10-2008, 06:03 PM   #8
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Quote:
Originally Posted by voltron1011 View Post
I overinflated my tires for a while to around 38psi but I noticed my cornering suffered alot from the lack of a contact patch.

The guys at Discount Tire told me that my 18in rims would be more protected from bending by running higher tire pressure (non RFTs)
They were probably right. Higher air pressure = less deformation of the tire under impact. Too much deformation = that pothole/whatever just now directly hit your wheel right through your compressed rubber.
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      05-10-2008, 06:09 PM   #9
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I try to run my tires at least 5psi (can go up to 10) over MAX PSI on sidewall of tire.

My stunt driving teacher taught us a LOT about tires. A lot of it wasn't just for stunt driving, but it had a lot of real world applications as well.

-You'll get a harsher ride...

+your sidewall will be a LOT stronger,

+you'll have significantly more contact patch/grip on wet surfaces,

+you're tires will actually be able to perform at their maximum speed rating (disappating heat)

+ your tires will last longer as long as you maintain their pressure.
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      05-10-2008, 06:28 PM   #10
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^ WTF?

No disrespect, but that's some
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      05-10-2008, 06:49 PM   #11
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+1. Overinflation will not provide the ideal contact patch.
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      05-10-2008, 07:02 PM   #12
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Doesn't over-inflation actually reduce the contact patch? It's like looking at a donut from the side, instead of a roll of tape. Know what I mean?
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      05-10-2008, 07:25 PM   #13
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      05-10-2008, 07:45 PM   #14
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Quote:
Originally Posted by Bimmer Loyalist View Post
Doesn't over-inflation actually reduce the contact patch? It's like looking at a donut from the side, instead of a roll of tape. Know what I mean?
Yup...

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      05-10-2008, 08:21 PM   #15
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^Good diagram but the think the over inflation should look less like a horseshoe and more like a dounghnut
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      05-10-2008, 09:06 PM   #16
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Running at the high end is one thing... Running at above is just silly and will result in a shitty ride, increased center wear, and reduced traction.

Back in the day, you might gain something by over inflating your 70 series tires but now all your doing is ruining perfectly good tires.

"Stunt Driving" has very little to do with safe or correct tire inflation for day to day driving or even a track day...

Stick to or near to tire pressures recommended by the OEMs and tire manufacturer, NOT some Bullshit on a website... Seriously, over inflating your tires is a pretty bad idea.
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      05-10-2008, 10:00 PM   #17
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Quote:
Originally Posted by tag824 View Post
^ WTF?

No disrespect, but that's some


Quote:
Originally Posted by Revlis View Post
Running at the high end is one thing... Running at above is just silly and will result in a shitty ride, increased center wear, and reduced traction.

Back in the day, you might gain something by over inflating your 70 series tires but now all your doing is ruining perfectly good tires.

"Stunt Driving" has very little to do with safe or correct tire inflation for day to day driving or even a track day...

Stick to or near to tire pressures recommended by the OEMs and tire manufacturer, NOT some Bullshit on a website... Seriously, over inflating your tires is a pretty bad idea.

I don't care what people do, and everyone has their opinion (myself included). But before taking racing courses, and stunt driving classes and everything I had my own inflation guidelines (about 3-5psi over manufacturer recommended psi). If the car manufacturer recommends 36psi, and the sidewall of your tire says "don't inflate past 44psi", then 44psi is NOT "Over inflating". The car companies are just giving you what they thing the best settings are to achieve ride comfort.



I don't give a shit really what people think, I'm just passing along some info that I've learned, and had first hand experience with. It's not like I learned it from some touring autocross clinic, or the local joe at the neighborhood tire store. I learned it from Bobby Ore, a professional stunt driver, who has more experience with this sort of thing than anyone else you'll ever get a recommendation from.
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      05-10-2008, 10:35 PM   #18
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Quote:
Originally Posted by MrSteak View Post
I try to run my tires at least 5psi (can go up to 10) over MAX PSI on sidewall of tire.
First you say you run your tires 5-10 over the MAX PSI on the sidewall and then you say...
Quote:
Originally Posted by MrSteak View Post
If the car manufacturer recommends 36psi, and the sidewall of your tire says "don't inflate past 44psi", then 44psi is NOT "Over inflating".
So.... which one is it? You've got me throughly confused.
Quote:
Originally Posted by MrSteak View Post
The car companies are just giving you what they thing the best settings are to achieve ride comfort.
It's more than just ride comfort that goes into factoring. Tire size (sidewall height), type of suspension (sport/non-sport), handling you desire, your driving speed and the weights/loads (i.e. passengers and luggage) you put into your car are all factors in proper tire inflation.
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      05-10-2008, 10:58 PM   #19
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Quote:
Originally Posted by xPaulBaiLeyx View Post
^Good diagram but the think the over inflation should look less like a horseshoe and more like a dounghnut
Nah, a tire is shaped like a squared U naturally, not a circle tube, plus you still have a lot of weight from the car. I honestly doubt you'd be able to inflate so much that it would look completely like a doughnut without the tire blowing out. The diagram is pretty much dead on. If you could ever inflate your tire so much that it was completely rounded like that then you'd get almost no grip at all.
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      05-11-2008, 07:25 AM   #20
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[quote=I don't give a shit really what people think, I'm just passing along some info that I've learned, and had first hand experience with. It's not like I learned it from some touring autocross clinic, or the local joe at the neighborhood tire store. I learned it from Bobby Ore, a professional stunt driver, who has more experience with this sort of thing than anyone else you'll ever get a recommendation from.[/QUOTE]

Send us a pic of you and your E9x up on 2 wheels, Joey Chitwood-style!
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      05-11-2008, 09:22 AM   #21
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Id run what the door says. Too high, and you will be getting very uneven wear, less handling, and less wet traction. Ive seen cars come in with high pressures, and they have very worn out centers.
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      05-11-2008, 02:22 PM   #22
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Quote:
Originally Posted by tag824 View Post
Yup...

I think that image has the contact patches backwards. I think the ends should be swapped. The over-inflated tire will have the center portion of the tread in contact with the road, while the underinflated tire will have the edges of the tread in contact.

And the maximum tire pressure on the sidewall is for maximum weight capacity. If you are not putting the maximum rated weight on the tires, you don't need the maximum air pressure.....
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