Scary on motorway

COKen · 10-05-2016, 06:56 PM

Quote:

Originally Posted by ft1330

When I had crappy Blizzak winter tires the car would wobble because the thread is thick and soft.

Crappy Blizzak???

Seems you may be the only person with that opinion ...
http://www.tirerack.com/tires/survey...sp?type=W&VT=C

Vitoco · 10-06-2016, 04:00 AM

Quote:

Originally Posted by vtown

Good catch Vitoco; my mistake.

I did the math with 225 40 18 as stock, it's supposed to be 225 45 18

So his fronts are actually 0.2" smaller in diameter than stock (as close as you can get at this width), rears are 0.5" diameter larger than stock. Point is there is 0.7" different diameter front to back.

Is this enough to mess with the high speed handling? Maybe, maybe not. Maybe it's the cheap ass tires? Maybe OP didn't buy rims with the correct offset? Maybe the tire shop messed up the alignment if/when they installed the new wheels?

All of these things could have an effect on high speed stability.

Hmm, I would say that the diameter difference can be taken out of the equation, so it´s probably low quality tires/wheels combined with a pinch of unbalance topped off with a nice misalignment

Lancelot · 10-06-2016, 04:04 AM

Can't agree with that...
I have the same experience as the OP with OEM 442M 19" wheels, almost new Michelin PSS tyres (so not runflat, not cheap either)
Alignment has been done recently and in all other respects appears to be perfect.

I'm leaning towards weak anti roll bars and/or suspension setup.

ARBs are due for an upgrade in a couple of weeks so i'll report back then.
Suspension might follow depending on the ARB result.

Vitoco · 10-06-2016, 04:23 AM

Quote:

Originally Posted by Lancelot

Can't agree with that...
I have the same experience as the OP with OEM 442M 19" wheels, almost new Michelin PSS tyres (so not runflat, not cheap either)
Alignment has been done recently and in all other respects appears to be perfect.

I'm leaning towards weak anti roll bars and/or suspension setup.

ARBs are due for an upgrade in a couple of weeks so i'll report back then.
Suspension might follow depending on the ARB result.

I did a trip from Sweden to Italy 2.5 years ago, spent most of the time on the autobahn above 200 km/h, car was rock solid. I have 245/35R20, MPSS. Rain, wind, whatever, made no difference.. However, with the 245s up front it is indeed prone to tramlining. But that is not the issue here.

Edit: I see that you have the M3 lower control arms, just sticking that piece in there without the rest of the "kit" might not be optimal. I don´t know, just a thought...

ErkanTR16 · 10-06-2016, 10:44 PM

Quote:

Originally Posted by Avrosse

Hi

Just curious if anybody elses car does this or could it be the wheels ive got?

When im driving on the motorway, if its windy my car feels like its getting blown from side to side. Doesnt feel safe. I had a 2009 Audi A3 S Line Black Edition before my 320d M Sport and this car stuck to the road like glue. My BMW feels like a big wobbly boat.

I only got the car 6 months ago, from BMW used approved, low miles, mint condition, so I know that there isnt anything wrong with it.

Ive got 20" 405s on my car which i put on a few days after getting it, so I didnt really give it enough time to see how it felt properly on the road with the standard 18" wheels.

Gotta say, if all BMW's drive like this, I wont be getting another one. I think Audi's drive alot better

:

Cheers

I've experienced this before. Driving on Highway 65MPH and car blowing left and right. It's even worse driving behind a lorry.

340i xDrive Msport.

Avrosse · 10-07-2016, 02:31 AM

Quote:

Originally Posted by Erkan_340i

Quote:

Originally Posted by Avrosse

Hi

Just curious if anybody elses car does this or could it be the wheels ive got?

When im driving on the motorway, if its windy my car feels like its getting blown from side to side. Doesnt feel safe. I had a 2009 Audi A3 S Line Black Edition before my 320d M Sport and this car stuck to the road like glue. My BMW feels like a big wobbly boat.

I only got the car 6 months ago, from BMW used approved, low miles, mint condition, so I know that there isnt anything wrong with it.

Ive got 20" 405s on my car which i put on a few days after getting it, so I didnt really give it enough time to see how it felt properly on the road with the standard 18" wheels.

Gotta say, if all BMW's drive like this, I wont be getting another one. I think Audi's drive alot better

:

Cheers

I've experienced this before. Driving on Highway 65MPH and car blowing left and right. It's even worse driving behind a lorry.

340i xDrive Msport.

Mobster1983 · 10-09-2016, 11:37 PM

Never had this issue, even in very high crosswinds. Car sticks to the ground at speeds of up to 155mph.

Lancelot · 10-10-2016, 12:32 AM

Quote:

Edit: I see that you have the M3 lower control arms, just sticking that piece in there without the rest of the "kit" might not be optimal. I don´t know, just a thought...

You may be right; I need to check this out, the increased agility may very well have a drawback, but I can't remember if I had that feeling before mounting them on.

Vitoco · 10-10-2016, 03:05 AM

Quote:

Originally Posted by Lancelot

You may be right; I need to check this out, the increased agility may very well have a drawback, but I can't remember if I had that feeling before mounting them on.

HighlandPete · 10-10-2016, 03:56 AM

Quote:

Originally Posted by Vitoco

Edit: I see that you have the M3 lower control arms, just sticking that piece in there without the rest of the "kit" might not be optimal. I don´t know, just a thought...

I'm suspicious of complaints about a car, after any modifications are made. Users can change parts and parameters to get a particular improvement, but as we know, BMW have tuned the chassis to get the best balance of inevitable compromises. We can change something to get what we feel is a preferred improvement, but there is a likely to be some negative change as well. We often read users change toe and/or camber, to improve some particular handling characteristic, but so easy to build in other issues. Easy to "rob Peter, to pay Paul". Then we blame BMW.

Lancelot · 10-10-2016, 04:14 AM

To some extent you're right, except the handling with original control arm was terrible, and borderline dangerous on some situations where there would be no response then a brutal response, changing the LCA has dramatically improved that.

Now with my former M135i, steering was both very precise and very stable at higher speeds too.

So blaming BMW, yes for not building the F30 as well as the F20 M135i.
Now I don't blame BMW for potential side effects (to be demonstrated) of a change I made.

FWIW, the M135i shares the same tension strut as all the others F20/F30, but has a specific LCA (resembling that of the M3, but not same part number) Bee Pee you might want to complement this as you're running an M135i I believe with upgraded LCAs as well.

beanbaguk · 10-10-2016, 04:48 AM

I've experienced this problem too...but only when driving at speed ( >100mph).

Otherwise the car is completely planted (and I genuinely pass through some very windy roads)

MrRedwood · 10-10-2016, 07:10 AM

For me, I think it is related to the overall numbness in the steering around center. It makes it harder to get a good feel and/or make minor corrections when wind is pushing the car from the side. The car is planted, but the steering doesn't feel that way.

nicknaz · 10-10-2016, 07:37 AM

+1 on this being a self inflicted issue with wheels and tires

You could also be gripping the steering too tightly or your car may have suspension damage

donkey · 10-10-2016, 09:31 AM

I was thinking of this thread yesterday while driving around, it was very windy due to the outer bands of hurricane matthew.

Car was planted and very steady even at 80+ MPH, on the stock staggered 19's with run flats.

10-06-2016, 04:04 AM	#69
Lancelot Major 568 Rep 1,291 Posts Drives: 2017 m550i Join Date: Sep 2012 Location: France iTrader: (0)	Can't agree with that... I have the same experience as the OP with OEM 442M 19" wheels, almost new Michelin PSS tyres (so not runflat, not cheap either) Alignment has been done recently and in all other respects appears to be perfect. I'm leaning towards weak anti roll bars and/or suspension setup. ARBs are due for an upgrade in a couple of weeks so i'll report back then. Suspension might follow depending on the ARB result. __________________ 2017 M550i \| Sophistograu Previous cars: 2014 F30 ActiveHybrid 3 \| 2012 f20 M135i
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10-09-2016, 11:37 PM	#73
Mobster1983 Lieutenant 42 Rep 503 Posts Drives: 2014 BMW 335i Join Date: Jun 2013 Location: Hawaii iTrader: (0)	Never had this issue, even in very high crosswinds. Car sticks to the ground at speeds of up to 155mph.
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10-10-2016, 04:14 AM	#77
Lancelot Major 568 Rep 1,291 Posts Drives: 2017 m550i Join Date: Sep 2012 Location: France iTrader: (0)	To some extent you're right, except the handling with original control arm was terrible, and borderline dangerous on some situations where there would be no response then a brutal response, changing the LCA has dramatically improved that. Now with my former M135i, steering was both very precise and very stable at higher speeds too. So blaming BMW, yes for not building the F30 as well as the F20 M135i. Now I don't blame BMW for potential side effects (to be demonstrated) of a change I made. FWIW, the M135i shares the same tension strut as all the others F20/F30, but has a specific LCA (resembling that of the M3, but not same part number) Bee Pee you might want to complement this as you're running an M135i I believe with upgraded LCAs as well. __________________ 2017 M550i \| Sophistograu Previous cars: 2014 F30 ActiveHybrid 3 \| 2012 f20 M135i
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10-10-2016, 04:48 AM	#78
beanbaguk Captain 455 Rep 938 Posts Drives: BMW G30 520d M-Sport Join Date: Feb 2015 Location: Costa del Sol iTrader: (0)	I've experienced this problem too...but only when driving at speed ( >100mph). Otherwise the car is completely planted (and I genuinely pass through some very windy roads) __________________ Current car: 2017 BMW G30 520d M-Sport, BMW F46 218d Grand Tourer Previous cars: 1989 BMW E30 316i, 1998 BMW E36 323i Coupe M Sport, 2009 BMW E87 116d, 2013 BMW F31 320d M-Sport
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10-10-2016, 07:10 AM	#79
MrRedwood New Member 8 Rep 8 Posts Drives: F30 340i RWD MT & G29 Z4 M40i Join Date: Jan 2016 Location: Europe iTrader: (0)	For me, I think it is related to the overall numbness in the steering around center. It makes it harder to get a good feel and/or make minor corrections when wind is pushing the car from the side. The car is planted, but the steering doesn't feel that way. Last edited by MrRedwood; 10-11-2016 at 05:38 AM..
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10-10-2016, 07:37 AM	#80
nicknaz Lieutenant General 3187 Rep 10,509 Posts Drives: C6Z Join Date: May 2008 Location: NorCal iTrader: (0)	+1 on this being a self inflicted issue with wheels and tires You could also be gripping the steering too tightly or your car may have suspension damage
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10-10-2016, 09:31 AM	#81
donkey Captain 464 Rep 715 Posts Drives: 6MT M2 Join Date: Mar 2016 Location: Flavortown iTrader: (0)	I was thinking of this thread yesterday while driving around, it was very windy due to the outer bands of hurricane matthew. Car was planted and very steady even at 80+ MPH, on the stock staggered 19's with run flats.
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