Why does my car shake more after driving over bumpy road once?

vaios55sp · 06-23-2014, 06:19 PM

The car sort of shakes when driving not smooth roads. Resumes smooth ride when back on smooth road.
Especially in the rear shakes so much.

P.s it has been softer before using the coilovers.

:

CJ421 · 06-23-2014, 10:44 PM

Please tell us what ...
-Wheel/tire combo
-Suspension (KW, etc, and what settings, if it has settings)
-How many miles on that suspension
-How much you lowered the car front/rear

bradsm87 · 06-23-2014, 10:51 PM

Do you have run-flat tyres? I believe it to mainly be a combo of run-flat tyres and sloppy subframe bushes.

vaios55sp · 06-23-2014, 11:25 PM

Rims are Oem 230 style + 2012 Bridgestone Potenza RFTs tires and Kw1 installed 2 months ago. I don't know how low but the highest has been set.

P.s 2008 335xi

Best!

mob17 · 06-24-2014, 05:05 AM

Remove the RFTs. They are one of the worst RFTs you can get, assuming they are similar to the same tyre we get here in the UK.

bradsm87 · 06-24-2014, 06:46 AM

Agreed. I'd remove RFTs and consider M3 subframe bushes to further fix the squirmy feeling.

CJ421 · 06-24-2014, 04:49 PM

I'll repeat what the previous two posters said; it's the RFT's that are killing your ride quality. Ditch them for some better rubber like Michelin Pilot Super Sports.

vaios55sp · 06-27-2014, 03:15 PM

Many thanks guys!

06-23-2014, 06:19 PM	#1
vaios55sp Private 22 Rep 78 Posts Drives: E90 335xi Join Date: Jul 2013 Location: CHICAGO iTrader: (0)	Why does my car shake more after driving over bumpy road once? The car sort of shakes when driving not smooth roads. Resumes smooth ride when back on smooth road. Especially in the rear shakes so much. P.s it has been softer before using the coilovers. :
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06-23-2014, 10:44 PM	#2
CJ421 Brigadier General 2497 Rep 4,433 Posts Drives: BMW G80 M3 Join Date: Feb 2011 Location: PA, USA iTrader: (1) Garage List 2024 BMW M3 Sedan [8.29]	Please tell us what ... -Wheel/tire combo -Suspension (KW, etc, and what settings, if it has settings) -How many miles on that suspension -How much you lowered the car front/rear __________________ 2024 BMW M3 Sedan Frozen Pure Grey II/Fjord Blue Past: 2021 Z4 M40i \| 2017 340i Sedan 6MT \| 2011 335i Coupe 6MT
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06-23-2014, 10:51 PM	#3
bradsm87 Lieutenant Colonel 618 Rep 1,698 Posts Drives: G20 330i & F25 LCI xDrive30d Join Date: Jun 2013 Location: Australia iTrader: (0)	Do you have run-flat tyres? I believe it to mainly be a combo of run-flat tyres and sloppy subframe bushes.
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06-23-2014, 11:25 PM	#4
vaios55sp Private 22 Rep 78 Posts Drives: E90 335xi Join Date: Jul 2013 Location: CHICAGO iTrader: (0)	Rims are Oem 230 style + 2012 Bridgestone Potenza RFTs tires and Kw1 installed 2 months ago. I don't know how low but the highest has been set. P.s 2008 335xi Best!
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06-24-2014, 05:05 AM	#5
mob17 Major General 423 Rep 5,615 Posts Drives: E92 335D Join Date: Mar 2012 Location: East Midlands, UK iTrader: (5)	Remove the RFTs. They are one of the worst RFTs you can get, assuming they are similar to the same tyre we get here in the UK.
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06-24-2014, 06:46 AM	#6
bradsm87 Lieutenant Colonel 618 Rep 1,698 Posts Drives: G20 330i & F25 LCI xDrive30d Join Date: Jun 2013 Location: Australia iTrader: (0)	Agreed. I'd remove RFTs and consider M3 subframe bushes to further fix the squirmy feeling.
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06-24-2014, 04:49 PM	#7
CJ421 Brigadier General 2497 Rep 4,433 Posts Drives: BMW G80 M3 Join Date: Feb 2011 Location: PA, USA iTrader: (1) Garage List 2024 BMW M3 Sedan [8.29]	I'll repeat what the previous two posters said; it's the RFT's that are killing your ride quality. Ditch them for some better rubber like Michelin Pilot Super Sports. __________________ 2024 BMW M3 Sedan Frozen Pure Grey II/Fjord Blue Past: 2021 Z4 M40i \| 2017 340i Sedan 6MT \| 2011 335i Coupe 6MT
	Appreciate 0 Quote

06-27-2014, 03:15 PM	#8
vaios55sp Private 22 Rep 78 Posts Drives: E90 335xi Join Date: Jul 2013 Location: CHICAGO iTrader: (0)	Many thanks guys!
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