Quote:
Originally Posted by DCAT1000
T But the strut PNs are the same for V3 and Clubsport, per KW USA.
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No, the clubsport struts begin with the number 202 and the V3 struts begin with the number 200.
You can check this in the installation instructions and TüV documents.
However, they are identical despite having a different p/n number, I guess to make identification less difficult (that's the only reason I can think of). (So internal valving and build spec on clubsports and V3 struts is the same). The internal valving is even the same between z4 and z4m struts (but knuckle mounting system is of course different). The only thing different is that the advices valve setting (clicks open/closed) for the z4m is different than for the z4; probably due to that the z4m front is heavier due to the cast iron s54.
I backchecked this with the development department in germany.
I guess I'm writing this so people don't get confused if they start backtracking PN's in the KW documents etc.
So it's very easy to change from V3 to clubsport on the (non M) z4:
change the linear 5kg/mm spring (170mm spring length) for a 7kg/mm 170mm spring, and ad the pillowball top mounts (of course you can change top mounts to personal preference, but the KW ones are decent quality with good dust seal protection, so very suitable to street use).
The only other difference as mentioned is that a V3 set has a 2 year warranty (ment for street use) and a clubsport set has no warranty (track use).
At least here in Europe; warranty situation might be different from country to country as legal systems can differ. In some countries (germany) it's also not permitted to drive on the street with clubsports as there is no TüV approval. So in that case you have to get independant TüV approval for these parts. (in germany, more or less everything you change on your car has to be formally added to the car's registration papers; some other countries (I believe Belgium) may have a similar system).
For the z4m, you need more parts to turn a V3 set into a clubsport set.
You need the linear 7kg/mm 170mm spring, the intermediate spring plate, the helper spring, the top spring plate and the pillowball top mounts.