Menu toggle

MO30 + Bilsteins -> MOT query

AlexG

AlexG

PCGB Member
Member
Ladies and gentlemen,

I currently have my car in being serviced, MOT'd etc.

As I have mentioned here previously I have fitted the MO30 springs and Bilsteins that many others have chosen as an upgrade option. However, the feedback I am receiving from the service department is that fitting the rear MO30 springs with these shocks is incorrect and will result in an MOT failure because:
  • The rear spring is not positively held in place when the car is jacked up, i.e. the distance between the spring 'seats' when the shock is at full extension is greater than the uncompressed length of the spring, potentially leading to incorrect seating of the spring during jacking operations;
  • The lower end of the spring sits directly on the adjuster collar, the design of which is such that the spring can come into contact with the threads on the body of the shock (the front shock lock ring has a raised 'inner lip' which the spring locates onto so this is not an issue at the front).
How have others got around the issue of the spring being 'too short' and the potential for incorrect seating when the car is raised/lowered?
I have to honest I simply lowered the car partially and then stuck my hand in behind the wheel to make sure the spring had seated correctly before lowering completely and letting the spring take full weight.
Now I think about it perhaps it needs a modification to the top seat to enable the spring to be held in place (at the top) during extension of the shocks. The reason for suggesting holding the spring against the top seat is because the bottom 'seat' is flat so incorrectly locating at the bottom is not an issue.

Are there any parts (in addition to those illustrated already on the shock here:
http://www.carnewal-europe.com/cpx/p93089.jpg) which need to be fitted above the lock ring prior to installation of the spring?

I re-used the original top seats for both front and rear, has anyone had to use a different type when going for this option?

Feedback very much appreciated.
Thanks Alex
 
This should not be an MOT failure. The tester is being very picky.

This is how most M030/HD Bilsteins will be running as yes correct the spring is shorter than the total travel. The springs are designed to locate correctly under the very very few circumstances this will ever happen on the road (60 over a hump back bridge anyone?).

There are two know mods

1/ Wire the tops of the springs to the turret tops. This stops them flapping but they still lift from the bottom mounts when fully extended (Porsche motosport mod).
2/ Fit helper springs to fill the gap.

Or just take the car to a decent Porche Indi who should MOT it no problem.

Ian.
 
Thanks Ian - it is maybe erring towards being picky, but I can see the reasoning and I am a little p!ssed off with myself for not considering the problem during installation, which would have saved the need to remove the units again.
Helper springs sounds like a difficult fix - or are these readily available? - off to Google now...

My favoured option at this stage is the 'motorsport mod', though I think I will enter into dialogue with those involved before I decide anything!
 
I agree with Ian above. I had exactly the same problem when my HDs and MO30 springs were fitted. The garage first suggested fitting helper springs but had difficult getting hold of some. In the end they just wired the springs to the upper cup.

I did contact Gert at Carnewal for his suggestions. He was aware of the condition and advised doing nothing as he had never had a spring actually come away from the cup.

pp
 
You must log in or register to reply here.

Posts made and opinions expressed are those of the individual forum members

Use of the Forum is subject to the Terms and Conditions

Disclaimer

The opinions expressed on this site are not necessarily those of the Club, who shall have no liability in respect of them or the accuracy of the content. The Club assumes no responsibility for any effects arising from errors or omissions.

Porsche Club Great Britain gives no warranties, guarantees or assurances and makes no representations or recommendations regarding any goods or services advertised on this site. It is the responsibility of visitors to satisfy themselves that goods and/or services supplied by any advertiser are bona fide and in no instance can the Porsche Club Great Britain be held responsible.

When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. Information can be obtained from the operator or the white pages. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide.

Directors of the Board of Porsche Club GB, Club Office Staff, Register Secretaries and Regional Organisers are often requested by Club members to provide information on matters connected with their cars and other matters referred to in the Club Rules. Such information, advice and assistance provided by such persons is given in good faith and is based on the personal experience and knowledge of the individual concerned.

Neither Porsche Club GB, nor any of the aforementioned, shall be under any liability in respect of any such information, advice or assistance given to members. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times.

Porsche
Lockton
Pirelli
Officially approved
Oracle Finance
WEX Esso
Collecting Cars
Archant Dialogue
Back
Top