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      10-20-2011, 02:45 AM   #1
Engeljizzle
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Changed tire size and hate it!! HELP!!

I have a 2011 E90 M3. This is my 4th E9X m3 so I know the car very well.. I used to have PSS 245/35/19 fronts and PS2 265/35/19 rears and just swapped them for PSS 255/35/19 fronts and PSS 275/35/19 rears. I HATE it and its honestly so different under fast driving conditions that I'm questioning if my car coincidentally broke right when I put new tires on it. Going fast around corners (80+) the car feels very floaty in the front, yet overly responsive (if that makes sense) but still feels like it has traction ONLY because the ass end isnt kicking out. Also, the traction light in MDM mode is constantly flashing. Driving at speeds in excess of 130 the car is extremely responsive to the point where I feel like if I make even the smallest steering input I will be in a wall. I had bad RTAB's on my e36 and also a bent control arm and this feels VERY VERY similar to what Im facing now. Any input would help, I am just trying to figure out if there is a problem with my cars suspension (which is stock) or if its just what happens when I go wider all around. The car has only 1900 miles so the tires would make too much sense, but for how the car feels I am concerned something is broken. Thanks!
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      10-20-2011, 05:46 AM   #2
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How long did you drive the new tire set? Normally it taks about 300-500 miles to break them in...and before that, they are not really fun to drive. I had this also on different bimmers by myself.

Also want to switch to 255/275 combo on my ZCP wheels, so I am interessted about the replys here.
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      10-20-2011, 07:11 AM   #3
New_m3
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Yes, sometimes the mold release compound on the tyres makes them slippy when new. The grip should increase once they're warn in.
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      10-20-2011, 08:19 AM   #4
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I bet BMW puts the OEM stock 245/265 combo for a reason.....they know what size should be on this car don't fool with mother nature bro....
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      10-20-2011, 08:47 AM   #5
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I hope you are on a track going that fast?

PSS in 255/275 are FINE. I personally have had them and know over 5 people that have this combination all worked flawless. On track and street.
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      10-20-2011, 09:55 AM   #6
wdd1040
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Running PSS 255/275 here with zero issues. Both on the street and track. Felt significantly better than the 245/265 PS2 stock combo.
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      10-20-2011, 11:53 AM   #7
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If you're taking corners that fast you probably should invest in some of these
http://kalecoauto.com/index.php?main...products_id=36

Cheap insurance.
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      10-20-2011, 12:03 PM   #8
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Send a message via Yahoo to Sean05
this is your 4th E9x m3 and you still dont know what the best set up...
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      10-20-2011, 12:24 PM   #9
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Check your tire pressure.
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      10-20-2011, 02:55 PM   #10
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      10-20-2011, 04:22 PM   #11
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Quote:
Originally Posted by Engeljizzle View Post
Sorry I don't have a car that sits in a garage all day. Btw what made you feel like waking up and being a dick today? I asked a question for help not for some prick with an ugly car to talk shit to me. I hope you feel good about yourself. You're the reason I feel like a dick for driving an m3.
Too bad the guy your insulting does just the opposite with his car... lolz...


I too feel that you just do not understand the car fully/ driving dynamics, as what you are describing should not be disturbing to the driver at all in fact the opposite. Did you happen to have the car aligned when you changed the tires also? Perhaps the increased turn in sensitivity is from a new/different toe setting?

Also are the new tires broken in??
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      10-20-2011, 05:00 PM   #12
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Well, if I could dignify this typically useless banter with a real answer, BMW traction control has always been very sensitive to tire size. Did you realize with your swap that you increased your tires diameters probably 0.4"? That confuses the traction control. As a result, the increased traction benefit gets negated by a traction control that will no longer work properly. This is a very popular combination, I know, but the results still don't surprise me. Others that are running it probably don't drive hard enough for the traction control to come on or they would notice it as well. If you just drive with the traction control off, well more power to you.
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      10-20-2011, 05:04 PM   #13
Engeljizzle
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Quote:
Originally Posted by isugoo View Post
I obviously know it's notwhat I just put on. Excuse me for trying something new. Put 245/265 bak on the car. It's way better.
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      10-20-2011, 05:17 PM   #14
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Quote:
Originally Posted by rye m3 View Post
Well, if I could dignify this typically useless banter with a real answer, BMW traction control has always been very sensitive to tire size. Did you realize with your swap that you increased your tires diameters probably 0.4"? That confuses the traction control. As a result, the increased traction benefit gets negated by a traction control that will no longer work properly. This is a very popular combination, I know, but the results still don't surprise me. Others that are running it probably don't drive hard enough for the traction control to come on or they would notice it as well. If you just drive with the traction control off, well more power to you.
I think it would be a bigger issue if he changed the front to rear stagger height which, from what I have read, is what can cause traction control issues. I don't think a 255/275 stagger would have any impact on the DSC compared to a 245/265 stagger as you are maintaining the same ratio the car is expecting to see. Now, if he was 245/285 or something like that, then I absolutely agree.

IMO, it is either the tires are new and greasy or there is a tire pressure issue.
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      10-20-2011, 05:20 PM   #15
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Quote:
Originally Posted by gthal View Post
I think it would be a bigger issue if he changed the front to rear stagger height which, from what I have read, is what can cause traction control issues. I don't think a 255/275 stagger would have any impact on the DSC compared to a 245/265 stagger as you are maintaining the same ratio the car is expecting to see. Now, if he was 245/285 or something like that, then I absolutely agree.

IMO, it is either the tires are new and greasy or there is a tire pressure issue.
I ran a 245/40/18 285/35/18 combo

Not bad in all honesty...but i won't do it again. only had it for 2k miles max
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      10-21-2011, 01:20 PM   #16
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Nothing to do with the stagger. Go on the TireRack website and check the OD of the tires. You will find that the new ones have a greater OD. That change will give you issues with the traction control, which seems to be very sensitive on BMW's. I would agree that new tires are greasy as well, which could cause issues, but the OP seemed to be well versed in recognizing new tire traction. The only way you might come close to the original OD is going from a 265/35 to a 285/30. Check it out.
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      10-21-2011, 02:07 PM   #17
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Quote:
Originally Posted by rye m3 View Post
Nothing to do with the stagger. Go on the TireRack website and check the OD of the tires. You will find that the new ones have a greater OD. That change will give you issues with the traction control, which seems to be very sensitive on BMW's. I would agree that new tires are greasy as well, which could cause issues, but the OP seemed to be well versed in recognizing new tire traction. The only way you might come close to the original OD is going from a 265/35 to a 285/30. Check it out.
But the difference is below 3%, so this should not have any effect to DSC/TC. BTW thanks for the info, I did not know that the change of the width of a tire has ANY effect on the diameter!

I also still think its the pressure or the tires need to run in a little bit more.
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      10-21-2011, 04:09 PM   #18
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Quote:
Originally Posted by rye m3 View Post
Well, if I could dignify this typically useless banter with a real answer, BMW traction control has always been very sensitive to tire size. Did you realize with your swap that you increased your tires diameters probably 0.4"? That confuses the traction control. As a result, the increased traction benefit gets negated by a traction control that will no longer work properly. This is a very popular combination, I know, but the results still don't surprise me. Others that are running it probably don't drive hard enough for the traction control to come on or they would notice it as well. If you just drive with the traction control off, well more power to you.

This is not totally accurate. DSC is sensitive to front/rear diameter differential, not the absolute size. The 255/275 combination should not have the effect described here. And I expect the OP is doing at least some of this test driving with DSC off, which is necessary to know what's going on with tires and suspension. Neither should it take 300 miles to scrub the release agent off the tires, unless it’s all driveway miles. The OP sounds like someone who is driving the tires sufficiently aggressive to have them in shape in a few days, at least that has been my experience. I have no answer to the problem. Unless something coincidentally was damaged or the alignment is substantially off.
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      10-21-2011, 04:10 PM   #19
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I just ordered PSSs in 255/35 & 275/35 today and having them mounted tomorrow. I'll be taking my car to my favorite mountain road on Sunday to break them in. I've spent probably 300 miles or so on this road in my e90 M3 on the stock PS2 set up over the past 4 months so I'll have a good idea has to how the new PSSs perform.

I won't be able to comment on how it works at high speed though as this is a tight road and I typically won't get over 70MPH. I save high speed runs for the track.

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      10-21-2011, 04:47 PM   #20
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Well, my 2011 came with the Continental tires and my DSC is kicking in ALL the time. I'm going to change the tires but am debating between staying with stock sizes or going with 245/35 and 285/30 (this combo gives equal F/R diameter). I know the DSC will have a greater tendency to engage based on the change in diameter, but this should be counteracted by the added traction. Also, I love to drive with the DSC off, and I could really use the added traction in the rear.

Does anyone know the rationale behind BMW's decision to go with the stock 245/265 tire sizes, because I really think the car could use more outright grip given its power levels.
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      10-21-2011, 05:36 PM   #21
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Quote:
Originally Posted by elh0102 View Post
This is not totally accurate. DSC is sensitive to front/rear diameter differential, not the absolute size. The 255/275 combination should not have the effect described here.
This is what I was trying to say above... I wasn't referring to stagger of the tire widths but stagger of the tire OD.
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      10-21-2011, 07:01 PM   #22
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I have 255/35 and 275/35 PS2s and I have zero issues
I think you didn't give your tires a chance to break in yet
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