Bodyshell - why's a non-sunroof more desirable?

[BEERBOY123]

Seen many a post on here commenting that a non-sunroof bodyshell is more 'desirable'.

Why is this? Is it because a sunroof bodyshell is more of a faff to paint and prep as a replacement or is there an inherent structural weakness with a sunroof shell?

I personally really like the sunroof in mine and specifically sought out a sunroof car.

Thanks

[gooner1]

Inherent structual weakness, that,s why most trackcars are non sunroof.
Personally, i,d die from claustraphobia.

[e30topless]

rust !

sunroofs are a known rusting point on any e30 and difficult/expensive to fix

[Kedge]

Rust issues are the reason, the panels rust easily from the inside but the main problem is the tray the roof slide in to, water can run into that and there's little or no paint in there and so it can start to bubble the roof up from the inside.

[Felix79]

Like gooner said , it's because the shell is stiffer and better for track use.

[BEERBOY123]

I thought the track car argument was more to do with weight saving?

Rust, yes that makes sense. But in terms of physics does it really make much structural difference?

[fuzzy]

its only desirable to those who prefer no sunroof.

[GrindCulture]

I thought the track car argument was more to do with weight saving?

That too, and not having a sunroof and all the associated gubbins it lowers the centre of gravity, although I doubt by a noticeable amount.

[magpie]

i was told for track cars it's easier to fit a roll cage in a none sunroof car,
i had one once but it never stopped the rear arches rotting out

[Cotty]

I thought the track car argument was more to do with weight saving?

If it is electric there is a lot of weight up there with the motor, runners etc. Track cars often have the motor, runners etc removed and a pannel welded in, one of the people who have done this can probably advise how much weight they have saved.

[Jhonno]

Weight, stiffness, roll cage fitment, rust

[ross_jsy]

probs my post?

well for me its as its a track car. my sport has a fake sun roof now to meet regulations

[Dave_M3]

Weight, stiffness, roll cage fitment, rust

Sumed it up in one Dan!

Think the whole sunroof assembly is about 36kgs when I took the one out of my track car...

Did the same to an E36 M3 Evo recently and we weren't far from 50kgs with all the bits associated with taking it out

My iS' sunroof panel has a little rust on it so hopefully that's all will need replacing when re-spraying it.

My other latest aquisition is a tatty but solid non-sunroof shell and running gear

[DanThe]

I just prefer the non-sunroof models as its less to go wrong, everything else is a benefit

[e30bmlover]

one word... rigidity.

[Morat]

Rigidity isn't anything to do with it. Show me the figures!
Sunroof is a lot of weight high up, and a rust trap.

[steve_000]

surely rigidity has something to do with it.... Its a hole in the middle of the roof?

[E30Gheko]

The reason I bought my 318. No sunroof & dolphin grey. Two big boxes ticked for me. There were rusty bits, but they are fixed now. It's just awaiting a motor with the correct number of cylinders.

[Simon13]

who cares?!

[bss325i]

If anything a sunroof car has a more rigid roof due to the sunroof tray bonded to the roof skin.

The fact it has a void in it makes little difference as the roof skin will flex with or without a hole.

Its the frame work that you can see that give strength. A sunroof car has more of this.

[DanThe]

Sunroofs are for plebs, aircon is for executives

[beemerbird]

All E30s are now getting on a bit; motors are getting a bit slow, rust is attacking from all sides. Having had my E30 resprayed at great cost, I felt empowered to make my sunroof work more efficiently. I pressed the operational buttons until the sunroof dutifully disappeared, then liberally applied aircraft grade lubricant.

I then pressed the operational sunroof buttons to get the bloody thing back into its closed mode. After about an hour of swearing, ripping out the sunroof liner in frustration, developing deep gouges in the paint from to - ing and fro - ing....

I have decided that a non sunroof model is the way forward.

Hope this helps

[Dave_M3]

I kinda agree on that side of it but in making a track car, your more than likely going to be cutting it out and just putting in just the panel to fit a cage etc and reduce weight so in that respect one with no sunroof would ...

In saying that.... a sunroof car may not be that strong either these days as rusty framework isn't that rigid

[bss325i]

I kinda agree on that side of it but in making a track car, your more than likely going to be cutting it out and just putting in just the panel to fit a cage etc and reduce weight so in that respect one with no sunroof would ...

In saying that.... a sunroof car may not be that strong either these days as rusty framework isn't that rigid

The design and lack or corrosion protection is so poor and very un-BMW like.

[beema_boy]

I dnt kno about track cars but as far as rust is concerned ive sorted all patches of bubble rust on my sunroof and a few others and resprayed them easy enough

also you can never say the roof is more rigid than a sunroof as there is more surface area on the roof. seems quite obvious tbh :S

as for motors going wrong etc. one word answer. . . manual hahahaha put yer arms to work
just my opinion personally dnt mean to step on anyones theory here

[DanThe]

PARDON?

[psychochild187]

rust no. rigidity no. reliability no.. weight . no


roll cage fitment yes


thats all i ever thought on it.

and thats that

[George]

If it's not rusty and we're talking road car - sunroof all the way imo. Going for a blast with all the windows down and the sunroof open =


All this talk about weight saving, centre of gravity etc...you'd have to be a pretty decent driver to tell the difference imo.

[BEERBOY123]

I totally agree GerogeUK: nothing better than both windows wound right down and roof right back: could almost be in a Baur!!!

[ImysE30]

I totally agree GerogeUK: nothing better than both windows wound right down and roof right back: could almost be in a Baur!!!

Just have the whole roof off

[Z3I]

Back in the 80's/90's you couldn't sell an E30 secondhand without a sunroof, the lack of it knocked twice the cost of the roof new!

Only company car users whose allowance only just stretched to a poverty-spec 316's had no sunroofs.

[Morat]

Strange isn't it. Nowadays having your sunroof open just means you're a pleb without aircon. I've just checked my sunroof tray and there's definitely some rust appearing now. I think its time to get busy with the kurust and see if I can hold it back

[DRIFTBOY]

If it's not rusty and we're talking road car - sunroof all the way imo. Going for a blast with all the windows down and the sunroof open =


All this talk about weight saving, centre of gravity etc...you'd have to be a pretty decent driver to tell the difference imo.

I totally agree too.

When I was looking for an E30 it had to have one, as it's my daily driver.

When this photo was taken I was nice and cool inside the car, and I definately wasn't thinking "It's all slow because it's heavy and it might fall over because of all the weight in the roof!"



I love to have the sunroof open, on both hot and cold days, you don't get the wind in your face like having a window open yet there is still a nice cool breeze.

That's more important to me than knocking a tenth of a second of my (probably very amature) lap times!

Of the all round enjoyable experience I have driving my car, the sunroof is a good part of it, and it has a roll cage too!

[Blitz]

Whats the best way from preventing rust in the roof?

[DanThe]

The best way is to strip the headlining out of your brand new fresh from the factory car and give the roof a serious dose of waxoil. If there is already rust there its not going to be as easy