E90 M3 - Carbon Roof
Discussion
Wills2 said:
jonasaurus said:
3rd party vendors sell CF roofs for E90 M3s, not from OEM but same weave etc as E92 M3s CF roof. Looks great if you're willing to spent a grand to get one.
A structural replacement for the factory fit roof? I have to say I find that very hard to believe. you can get one for the z4mc,
its actually not a 'structural' part of the car, the roof is bonded on with a similar thing as lotus use on the elise chasis,
iirc, there are also a few bolts, (4 on the Z4M and 6 - i think - on the m3)
the structure is actually the pillars at either side and the brace above the windows ( like a roll cage without the x bars )
and to support other statements, all '92s had a cf roof, unless sunroof was specced, in which case no cf !
90's did not come with a cf roof at all - which is a shame,
but the 90 is actually a saloon turned up to 11, but the coupe is pretty bespoke.
ClarkyboyS said:
Wills2 said:
jonasaurus said:
3rd party vendors sell CF roofs for E90 M3s, not from OEM but same weave etc as E92 M3s CF roof. Looks great if you're willing to spent a grand to get one.
A structural replacement for the factory fit roof? I have to say I find that very hard to believe. you can get one for the z4mc,
its actually not a 'structural' part of the car, the roof is bonded on with a similar thing as lotus use on the elise chasis,
iirc, there are also a few bolts, (4 on the Z4M and 6 - i think - on the m3)
the structure is actually the pillars at either side and the brace above the windows ( like a roll cage without the x bars )
Not structural? Even a windscreen provides structure and therefore rigidity to your car so I'm pretty sure the roof does.
Wills2 said:
ClarkyboyS said:
Wills2 said:
jonasaurus said:
3rd party vendors sell CF roofs for E90 M3s, not from OEM but same weave etc as E92 M3s CF roof. Looks great if you're willing to spent a grand to get one.
A structural replacement for the factory fit roof? I have to say I find that very hard to believe. you can get one for the z4mc,
its actually not a 'structural' part of the car, the roof is bonded on with a similar thing as lotus use on the elise chasis,
iirc, there are also a few bolts, (4 on the Z4M and 6 - i think - on the m3)
the structure is actually the pillars at either side and the brace above the windows ( like a roll cage without the x bars )
Not structural? Even a windscreen provides structure and therefore rigidity to your car so I'm pretty sure the roof does.
as for structure,,, i suppose i wrote that a bit misleading,
its not part of the safety structure, but provided you fitted the new roof as the old on was fitted (with bonding correctly etc) it. and of course, CF should provide more rigidity whe fitted correctly etc.
hope that makes better sense?
Wills2 said:
Not structural? Even a windscreen provides structure and therefore rigidity to your car so I'm pretty sure the roof does.
It probably does offer 'some' extra strength, but not in the magnitude of a proper roof panel.Don't forget that the Z4M coupe is basically the Z4M roadster (which doesn't have a proper roof anyway) with bracing between the A & B pillars and between the B pillars at the rear. With all this strengthening it's already stronger/stiffer than the roadster, so there was no need for a structural roof panel. The windscreen was part of the roadster, and part of the structure, so there is no difference between the coupe & roadster in that.
Or are you implying that the roadster's soft-top adds to the structural rigidity of the car when it's in the closed/up position
Of course, all of this is relevant to the Z4M and this topic was about the e9x.
ClarkyboyS said:
i dont know about costs for the e90 roof, but for the z4mc it was 1800USD - to buy, not fitted,
as for structure,,, i suppose i wrote that a bit misleading,
its not part of the safety structure, but provided you fitted the new roof as the old on was fitted (with bonding correctly etc) it. and of course, CF should provide more rigidity whe fitted correctly etc.
hope that makes better sense?
I googled and watched the video, wow! Not sure I'd do it though.as for structure,,, i suppose i wrote that a bit misleading,
its not part of the safety structure, but provided you fitted the new roof as the old on was fitted (with bonding correctly etc) it. and of course, CF should provide more rigidity whe fitted correctly etc.
hope that makes better sense?
Cheers.
mmm-five said:
Wills2 said:
Not structural? Even a windscreen provides structure and therefore rigidity to your car so I'm pretty sure the roof does.
It probably does offer 'some' extra strength, but not in the magnitude of a proper roof panel.Don't forget that the Z4M coupe is basically the Z4M roadster (which doesn't have a proper roof anyway) with bracing between the A & B pillars and between the B pillars at the rear. With all this strengthening it's already stronger/stiffer than the roadster, so there was no need for a structural roof panel. The windscreen was part of the roadster, and part of the structure, so there is no difference between the coupe & roadster in that.
Or are you implying that the roadster's soft-top adds to the structural rigidity of the car when it's in the closed/up position
Of course, all of this is relevant to the Z4M and this topic was about the e9x.
So having a proper roof improves the torsional ridgity of a car, a soft top isn't structural unlike the roof on a coupe/saloon so why would I imply that.
So back to my original point in my opinion the roof on the e90 is structural, but having seen the video I've answered my own question they do indeed replace it (cut it out and bond in another)
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