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#659797 - 29th Jan 2012 11:03pm Advice on lowering springs and stiff suspension
Neil_c Offline
Smartchild

Registered: 27th Sep 2009
Posts: 417
Loc: birkenhead
I've got quite stiff suspension on my BMW (Eibach springs and Bilstein shocks). shocks are new.

Would you say it's normal to feel imperfections in the road a bit more under breaking? My gilf has a K.A. which is obviously a bit pot of treakle and can go over any pothole under braking without much feedback into the steering wheel.

Naturally when the car brakes, the weight will transfer to the front but would you say it's fairly normal to get some feedback under braking through the wheel on a lowered car?

On a flat surface I don't notice much. Discs runout is within tolerance and reaction bushes have been replaced.

Thanks.

Neil.

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#659804 - 29th Jan 2012 11:32pm Re: Advice on lowering springs and stiff suspension [Re: Neil_c]
dave_g Offline
Forum Addict

Registered: 22nd Feb 2008
Posts: 1131
Loc: wallasey
my old golf used to really crash into potholes and tramlined quite a bit,its just part of having a stiff lowered car!

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#659805 - 29th Jan 2012 11:39pm Re: Advice on lowering springs and stiff suspension [Re: Neil_c]
_Ste_ Offline


Wiki Master

Registered: 7th Aug 2005
Posts: 16003
Loc: New Brighton
Tis normal mate my Astra gsi has hardened dampers and lowering springs and I feel everything in the road, that's with all new tires on too.

My old ac schnitzer e36 was the same too.
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#659871 - 30th Jan 2012 12:08pm Re: Advice on lowering springs and stiff suspension [Re: Neil_c]
Neil_c Offline
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Registered: 27th Sep 2009
Posts: 417
Loc: birkenhead
On freshly laid motorway tarmac even at speed the braking feels reasonably smooth, it's just on rough side streets, usually at lower speeds.

It is a bit more noticeable when the car is loaded (i.e. with more passengers).

Do you find you get any feedback yourselves through the steering wheel if the motorway is flat? (I get very little myself if the road is smooth).

I did some research on it last night and it's called "bump steer". Apparently it can be minimised by changing the geometry of the track rod ends.

http://forums.bimmerforums.com/forum/showthread.php?t=178221

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#660001 - 30th Jan 2012 6:12pm Re: Advice on lowering springs and stiff suspension [Re: Neil_c]
keving Offline
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Registered: 18th Apr 2011
Posts: 628
Loc: wirral
do you have very low profile tyres on large wheels??
When I had 19" wheels on my 330i, and when I had 20" wheels on my 350z the results where as you're experiencing. I went to 18's on both cars when tyres needed changing, couldn't put up with it in the end just, for improved looks.

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#660077 - 30th Jan 2012 9:57pm Re: Advice on lowering springs and stiff suspension [Re: Neil_c]
Neil_c Offline
Smartchild

Registered: 27th Sep 2009
Posts: 417
Loc: birkenhead
215/45/r17 on back and 205/40/r17 on front. 17" wheels basically with low profile tyres. I might even them out to 215/45 once the front tyres wear out.


Edited by Neil_c (30th Jan 2012 9:59pm)

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#660143 - 31st Jan 2012 10:27am Re: Advice on lowering springs and stiff suspension [Re: Neil_c]
Nelzy84 Offline
Forum Guardian

Registered: 21st Dec 2010
Posts: 3354
Loc: Wirral
Similar on mine mate lowered on Schnitzer springs and cant clear most speed bumps over 3 mph, car can bottom out, car is also on low profiles 255 35zr r18's - not sure if that helps with anything
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#660239 - 31st Jan 2012 12:10pm Re: Advice on lowering springs and stiff suspension [Re: Neil_c]
Neil_c Offline
Smartchild

Registered: 27th Sep 2009
Posts: 417
Loc: birkenhead
I think having wider & taller tyres on the back than the front is likely to be a factor in bump steer.

Prob not worth the hassle of doing anything with it though. I did try large tyres all round but you're quite limited with lowering springs and the ability to steer!

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#660559 - 31st Jan 2012 8:13pm Re: Advice on lowering springs and stiff suspension [Re: Neil_c]
johncon Offline

Smartchild

Registered: 17th Oct 2010
Posts: 628
Loc: bromborough
my bmw is prone to bump steer and what i call tramlining ie it wants to follow imperfections in the road being in motor trade i drive a lot of different cars but bmw,s with big wheels do seem to be prone to these sort of problems i recently drove a 330 and it was almost frightening check the bushes on the rear of the front wishbones they can apear to be ok but be quite soft this can exagerate the problem
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#660595 - 31st Jan 2012 8:54pm Re: Advice on lowering springs and stiff suspension [Re: Neil_c]
Neil_c Offline
Smartchild

Registered: 27th Sep 2009
Posts: 417
Loc: birkenhead
I had the reaction bushes replaced a few years ago by bmw. you're right abouth the tramlining. the car does handle really well though, you just have to put up with the road feedback. Getting it tracked on a Hunter at Buckley tyres really helped and having the wheels balanced on a modern machine made a huge difference.

How do you find the steering on your bmw under braking? do you feel the road more than under throttle?


Edited by Neil_c (31st Jan 2012 8:57pm)

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#660771 - 1st Feb 2012 1:09am Re: Advice on lowering springs and stiff suspension [Re: Neil_c]
Sarah_ZR Offline
Wiki Veteran

Registered: 8th Jul 2011
Posts: 8484
Loc: wirral
Mine is only lowers 60 mil and yes every bump on the road I feel no matter how big all small

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