Just curious as to what tire pressures, people are running. The factory recommended pressures seem a little spongy, but then again I'm still in the break in phase. I want a good mix of handling and even wear. Any suggestions...

35 on daily driving. 20-25 on the track

I always set everything to 35 psi. Runflats, regulars, X's, 3's, 5's, 7's, whatever.

I have a 2007 328xit, sport package, conti RFT, 225/45 17". 15K miles on it now.

It was delivered with 33 all around, as I remember.

But the manual's specs are very different -- 32 F and 39 R. The door decal agrees.

I left it at what the dealer had it at, but I had to make a long trip Monday so I went ahead and set them to 32/39. It felt OK, but a little different.

I don't know what to think. That's a big difference in the rear.

Anybody?

I set the factory recommended pressures of 32/35 with the Sports Package and 18" runflats. Handling seems to be great at the recommended pressures. I check them every 2 weeks. Why set anything other than that which is recommended....more pressure=harder ride.....less pressure=increased tire wear.

i set everything 32/36 at work

I have a 2007 328xit, sport package, conti RFT, 225/45 17". 15K miles on it now.

It was delivered with 33 all around, as I remember.

But the manual's specs are very different -- 32 F and 39 R. The door decal agrees.

I left it at what the dealer had it at, but I had to make a long trip Monday so I went ahead and set them to 32/39. It felt OK, but a little different.

I don't know what to think. That's a big difference in the rear.

Anybody?

IMHO, that is a silly setting! The weight is up front and thats where you want the increased pressure. My Audis run 39 frt/36 rear with perfect tire wear. Of course, that car weighs over 2 tons but if you set the tires at 36/34 or 35/33, youll be fine.

The weight is up front and thats where you want the increased pressure.

Not sure what you mean, the E90 has a 51.7/48.3 weight distribution and E92 is 51.2/48.8. That's not really enough to warrant change in tire pressure front/rear is it?

The reduced pressure up front is not for weight, it is for better handling.

Well, it is the T model. Here's what the manual says for "with Sports Package" and the 225/45 R 17

328i 32 / 36
328xi 32 / 36
328it 33 / 41 (!)
328xit 32 / 39

So if I'm reading this all correctly, x or no x for the sedan -- no difference

F-R differential = 4 lbs

but x or no x for the wagon, 2# more without X.

F-R differential = at least 7#, 8# if no X.

I probably should call the dealer and ask directly -- why did you set them the way you did? They might have what they consider an excellent reason.

You can try various pressure combinations but I believe there are wear indicators on the outside of your tires. Here's how I used them: At the track this weekend I used 35/37 then on the second day I lowered the rears to 35. The latter was much better and with increased pressure in the front it felt like I alleviated a bit of that understeer our cars are so famous for.

BTW. The wear indicators told me this was a good setting.

I'll bring it back down to 33/35 for street driving and watch my tires for wear.

I was curious about this as well. I had the tire pressure warning light come on yesterday. Since I'd recently had it at the dealer for tire and wheel replacement, I was concerned. The pressures were set at 40 in the rear and 36 in the front by the dealer. I reset them, per manufacturer's specs, to 39 in the rear and 32 in the front. I then reset the tire pressure sensor with no problems. My question is...32 in the front feels a bit soft. Any suggestions?

The higher pressures these days are for fuel economy. The probably recommend higher just to bump the MPG up on the specs. Don't the tires have recommendations?

Good point Beer Goggles. I was just looking at the sticker on the inside of the drivers' door for pressures. I'll check the tires as well. i'm sure you're right about bumping pressures for fuel econcomy...seems that would also cause premature tire wear though.

The owner's manual specifies different pressures for high speed driving. Does anyone do this?

My car was delivered with 38 all around. I dropped them to 32 all around and I immediately noticed my ride was not nearly as jarring as before. It was not a huge improvement, but it was noticable.

35 on daily driving. 20-25 on the track

Front and rear are different.. plus the manual says to put more in if you drive it over 100MPH, so shouldn't you be using higher psi on track?

I am using 34 all the way around. Don't understand the change front to rear unless they are on staggered tire and rim size. Is that the case?

The heck with the track.

I am planning on a run down the new and widened US285 from Clines corners to Roswell. If I am going to try out the top speed, I would really like to know if the owner's manual published requirement for 39 front and 45 rear are correct. Seems counter intuitive. Higher centripetal (no, not centrifugal, damn it!) forces would seem to dictate lower PSI. But then there must be something that I do not know about this. After all, the BMW engineers are pretty sharp.