Discussion
Just wondering if anyone has any experience of these on M's? Have found a number of positive reviews on other makes, and the occasional on BMW's, but only one on an e90 m3(which was pretty positive)
looking for a coilover for my Z4m coupe with budget in mind to give a slight drop and help improve the bouncy choppy ride. Any sharpening of the handling would be a bonus , but don't find it that bad stock. Z4m spring rates seem to cause lots of the issue with the fronts relatively soft and rears very stiff. Most coilovers BC included even out the spring rates front to back which seems improve things. Not expecting the BC to be as good as a KW kit at the price, but hoping for a bit more control and improvement than just going eibach springs or the like. Any comments or reviews on the BC welcomed
looking for a coilover for my Z4m coupe with budget in mind to give a slight drop and help improve the bouncy choppy ride. Any sharpening of the handling would be a bonus , but don't find it that bad stock. Z4m spring rates seem to cause lots of the issue with the fronts relatively soft and rears very stiff. Most coilovers BC included even out the spring rates front to back which seems improve things. Not expecting the BC to be as good as a KW kit at the price, but hoping for a bit more control and improvement than just going eibach springs or the like. Any comments or reviews on the BC welcomed
when it comes to coil over and suspension you pay for what you get.... save up and get the best you can... i was amazed to see my friends kw items after numerous harsh uk winters look new again after a quick wipe off.... their stuff is imo some of the best... but as you know the higher end items are 2.5k plus :-( The BC racing stuff is decent enough for the price but id worry about budget coil overs personally.
Edited by Beedub on Saturday 20th September 13:59
I’ve not got direct experience of BC’s but I have of HSD’s and I’m led to believe they are all much the same at that price point.
They are great for track work, not sure I would choose them for the road though. Coilovers come into their own because they are so adjustable but solid top mounts and camber plates do little for the road experience (NVH etc).
From what I can gather (rather than direct experience) unless you are buying at the top of the market, the rust proofing isn’t in the same league as OEM.
From a resale perspective, not sure I would touch a car at the Z4M price point with £600 coilovers on it.
They are great for track work, not sure I would choose them for the road though. Coilovers come into their own because they are so adjustable but solid top mounts and camber plates do little for the road experience (NVH etc).
From what I can gather (rather than direct experience) unless you are buying at the top of the market, the rust proofing isn’t in the same league as OEM.
From a resale perspective, not sure I would touch a car at the Z4M price point with £600 coilovers on it.
Thanks for the feedback. I really wasn't looking to go for coilovers, just something to improve the bouncy rear end ride quality. I had considered just going eibach springs as I had them on an e46 M3 in the past. The problem is the spring rates are fairly close to the oe springs, presumably down to working with the oe shock valving. After that there doesn't seem to be much option for shocks and springs for the z4m other than coilovers
Thanks Jonathan, are you running the hsd's on a Z4m? and if so how is the ride quality? particularly the unsettled bounce feeling over bumps?
Fully understand that a cheaper coilover set up may be detrimental come resale, but I have DIY'd a number of suspension changes on BMW's over the years. I'm happy to swap them back over for OE when selling if required. The main issue with the suspension feel seems to be the softness of the front springs and stiffness of the rear. Really i'm looking for a good set of matched shocks and springs with more even spring rates front to back. Cant seem to find that anywhere other than going coilover. All lowering springs are matched to the OE damper valving so soft at the front stiff at the rear.
Fully understand that a cheaper coilover set up may be detrimental come resale, but I have DIY'd a number of suspension changes on BMW's over the years. I'm happy to swap them back over for OE when selling if required. The main issue with the suspension feel seems to be the softness of the front springs and stiffness of the rear. Really i'm looking for a good set of matched shocks and springs with more even spring rates front to back. Cant seem to find that anywhere other than going coilover. All lowering springs are matched to the OE damper valving so soft at the front stiff at the rear.
I've run bc on 2x e36, are imho similar to most of the market in performance, & longevity is fine, springrates have several options.
In e36 fitment however are many other options that are available for a similar price level, for z4 that maybe different, but you can get several German or euro manufacturers products that may be considered to suit a z4 more come resale time, even if actual performance is similar or even inferior.
for example for 36 the following are cheaper or same price as bc- kw v1, Eibach coilovers, Fk konigsports (koni dampers), fk, weitec tx & gt (damp adjustable & non adjustable) bilstein pss (the non damping adjustable version of psss9) h&r cup kit, h&r twin tube coilies, the monotube set up is dkightly more, but I run these on another 36 & really rate them.
In e36 fitment however are many other options that are available for a similar price level, for z4 that maybe different, but you can get several German or euro manufacturers products that may be considered to suit a z4 more come resale time, even if actual performance is similar or even inferior.
for example for 36 the following are cheaper or same price as bc- kw v1, Eibach coilovers, Fk konigsports (koni dampers), fk, weitec tx & gt (damp adjustable & non adjustable) bilstein pss (the non damping adjustable version of psss9) h&r cup kit, h&r twin tube coilies, the monotube set up is dkightly more, but I run these on another 36 & really rate them.
With regards to how they perform on the road it will depend how well set up they are. I'm running mine on medium settings and they are great on track and perform well on the road. I've tested them extensively around the undulating and often bumpy drivers roads in north wales and think they are very good.
Thanks Again,
My main issue is that I have had a 328 e36 and e46 M3 in the past, both of which I modded the suspension on. However, they both rode well as stock and the suspension changes were purely to improve body roll and get them slightly lower. THe Z4m is bouncy and unsettled on anything other than smooth tarmac. The handling as is could be improved slightly, but its the ride quality that is the issue
My main issue is that I have had a 328 e36 and e46 M3 in the past, both of which I modded the suspension on. However, they both rode well as stock and the suspension changes were purely to improve body roll and get them slightly lower. THe Z4m is bouncy and unsettled on anything other than smooth tarmac. The handling as is could be improved slightly, but its the ride quality that is the issue
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