Free M Suspension Parts

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Thesurveyor
Joined: Tue 15 Oct, 2013 14:36
Posts: 119

  M roadster S50
Location: Kent

Free M Suspension Parts

Post by Thesurveyor » Fri 02 Sep, 2016 11:30

I have just upgraded my Z to a custom KW suspension set up. Its only variant 1 so nothing too radical and the ride height is standard.
I have kept the old front struts and the four springs. Obviously they are not in the first flush of youth (18 years old and 98k miles) but neither are they broken or totally past it. I was going to keep them for originalities sake but I don't really have anywhere to put them so if any member here would like to collect them from me in Dartford, then they are yours. Got to be better than taking them down the dump. Feel free to PM me if you are interested.

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Alfie
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Joined: Thu 29 Apr, 2004 15:28
Posts: 3306

  M roadster S54
Location: Broadchurch....

Re: Free M Suspension Parts

Post by Alfie » Sat 03 Sep, 2016 12:28

Hi. You have pm. A.
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pingu
Joined: Fri 30 Apr, 2004 17:01
Posts: 3337

  M roadster S50

Re: Free M Suspension Parts

Post by pingu » Sun 04 Sep, 2016 19:04

Alfie wrote:Hi. You have pm. A.
Alfie. You know that S50 and S54 front suspension is different, don't you?
Pingu

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Alfie
Z Register member
Joined: Thu 29 Apr, 2004 15:28
Posts: 3306

  M roadster S54
Location: Broadchurch....

Re: Free M Suspension Parts

Post by Alfie » Tue 06 Sep, 2016 23:34

pingu wrote:Alfie. You know that S50 and S54 front suspension is different, don't you?
Thanks Gary, yeah, it's actually the rear springs I need, but can't seem to find confirmation that these S50 ones are identical to mine. :rtm:
Si reckons they'll fit, but they're a bit softer. Not really what I want, but OEM are currently a very silly £300+VAT for a pair from BMW and on several weeks' back order from 'the motherland'.
As you know, I have a strong urge to keep RED original, but I might have to consider a decent aftermarket option for this.
Opinions?

Cheers.
A.
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pingu
Joined: Fri 30 Apr, 2004 17:01
Posts: 3337

  M roadster S50

Re: Free M Suspension Parts

Post by pingu » Wed 07 Sep, 2016 00:24

BMW don't list their springs on RealOEM. The only way to get a pair is to quote them your chassis number and confirm the car is standard - which you have (by the sounds of it).

I don't think that you will get any from anywhere that are as well spec'd as BMW's - if your car is as it left the factory. I've only had a quick glance at the 330 list and there must have been close to 50 options :shock: .

I bit the bullet on the 330 and paid the £300+VAT for a pair of rears.

Any you get from non-BMW will be "that'll do's". If your car is non-standard, they will always be "that'll do's". BMW seem to be very thorough and go to town on specifying the correct spring rates.

According to my handbook, the weight of my car is 1425kg. It doesn't give the weight per axle. Have a look and see if yours is the same.

The 330 rears were a doddle to fit. Just undo the bottom shock mount and the lower arm dropped far enough to fit the new spring. I've not looked, but the Z might be the same.

Conclusion

I'm 99% sure that they are the wrong springs for your car, but the difference is probably not noticeable. I'm confident that they will physically fit.
If it were me, I'd give it a go if I could get them in my hands for £20 (a £20 gamble that could save £280) - but I don't mind taking a punt and doing the job twice.

Why not get them and put £1 in a jar every day and buy the right ones in a year :D
Pingu

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Brian H
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Joined: Tue 16 Dec, 2008 19:55
Posts: 2502

  Z3 roadster 3.0i

Re: Free M Suspension Parts

Post by Brian H » Wed 07 Sep, 2016 08:01

If you are lucky you may still have the part number tag on the OEM springs, this will help identify the correct part, other than that as Pingu states it is off to BMW to get the correct part number.

siwilson
Joined: Fri 19 Jun, 2009 10:54
Posts: 782

  M roadster S54
Location: Horley

Re: Free M Suspension Parts

Post by siwilson » Wed 07 Sep, 2016 08:23

Well there's wrong and really wrong. Any Z3 rear spring will 'fit'. The question is how close to the 100% correct spring rate you get. Our cars were built with different springs depending on which options were specified from the factory. On the front only the air-conditioning seems to make a difference. However, all the options including the anti-theft alarm (believe it or not) impact the rear part number.

How do I know this? The BMW ETK. Enter your vin and then prior to going into the diagrams click on the spring rate table on the right hand side.

So for Alfie, there are two part numbers relevant to rear springs. 33 53 9 70128 (no options) and 33 53 9 70129 (all options selected). Interestingly, if I select the options Alfie has then the 29 is the correct one, regardless of hardtop or not. So the 100% correct spring is 33 53 9 70129 :). Moreover, even though S54 dampers are different to S50 the rear spring seem to be the same as the ones for an S50. Ergo, these will be OK.

Si.
2001 M roadster S54 Laguna Seca Blue

gookah
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Joined: Thu 07 Aug, 2008 10:51
Posts: 2722

  Z3 roadster 2.8

Re: Free M Suspension Parts

Post by gookah » Wed 07 Sep, 2016 12:07

Why would they have different spring rates for an anti theft alarm at a few grams, but not a hardtop being fitted?
or the fact you could be average 80kg lighter on one side without a passenger, and there is no allowance given depending whether it's a skinny git or fat bstard driving.?
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Z3 2.8 Progress Journal (Mine)
Z3 1.9 Sport Progress Journal (Wifey's)

I have an element of 'M-styling' on my car, If that's a good enough reason for the manufacturers to adorn a 320 with the M badge, then its certainly a good enough reason for me..

Thesurveyor
Joined: Tue 15 Oct, 2013 14:36
Posts: 119

  M roadster S50
Location: Kent

Re: Free M Suspension Parts

Post by Thesurveyor » Wed 07 Sep, 2016 15:38

I have had a look and there are no part numbers visible on the rear springs.
I had replacement Konis on the rear when I bought the car so no help there.
The front struts are Sachs, part number 1-0211-37-634-A if that is of any help.
They have the BMW roundel and the words MRoadster on them so I'm sure they are correct.

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Alfie
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Joined: Thu 29 Apr, 2004 15:28
Posts: 3306

  M roadster S54
Location: Broadchurch....

Re: Free M Suspension Parts

Post by Alfie » Fri 09 Sep, 2016 14:12

Don'tcha just love this site? 8-)
Thanks all for your knowledge and input.
:thumb:

A.
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