We have a roll cage in our GTM rally car as the regulations require this.

http://www.geoffmayesmedia.com/rally371.html?page=5

Following an e-mail from Dave MacBean last week I've been dicussing with my fabricator the possibility of a bolt-in cage design. The key design issue is how to handle the rear stays. The cage I have in my rallysprint car has the stays running below the rear window to the space frame in the region of the subframe mounts but this places the point where they meet the main hoop below the top. I'm not sure whether this woud meet the MSA spec -- does anyone know?? The Blue Book is a very confusing thing to read on screen as the diagrams are all at the back of section entailling lots of flicking back and forth.
The cage in Scatmann's car has stays that meet the top of the roll hoop but that requires significant changes to the rear deck area/new rear window design etc that I suspect others would be loath to make. Wish I'd had the funds to buy that car -- it looks stunning in those photos.

Steve

Blue book states as follows:

1.3.3. Backstays. These are compulsory and must be attached near the roofline and near the top outer bends of the main rollbar on both sides of the car. They must make an angle of at least 30° with the vertical, must run rearwards and be straight and as close as possible to the interior side panels of the bodyshell.

I do recall seeing a forward diagonal however on an Elise cup car. So it may be possible to run the diagonals forward providing they do not impede access.

David

Have a look at the Elise S1 brace on the Safety Devices web site........

It's worth looking at the Europa cage as well.......

Thanks Mr Mac -- I also remember a picture of a hillclimb Coupe in one of the kit mags -- a long time ago -- with a forward facing bar so worth a look. Also through contacts I've e-mailed an MSA Scrutineer who lives locally so I'm hoping that he might be able to review the design in my car and pronounce on whether its "legal". The stays are definately at a greater angle than 30 deg but the issue is the height at which they are positioned on the main hoop.

Steve

Any progress with a full MSA compliant cage? Would like to fit one over the winter....as my car is now finished but I have almost completely missed the season!!

Regards

David

Unfortunately no progress beyond the MSA scrutineer visit -- I need to chase him but I'm on vacation soon so it may have to wait until sometime in October.

http://www.ppcages.com/displayimg.php?u ... in/001.jpg
who's is this coupe?

Owned now by David Large

Its his D16 powered sprint/hillclimb car

Neil

I have owned this car for about three and a half years; can I help at all?

David

@david, what seats you have installed in your car?

I have one Kirkey racing seat, it is an unregistered track car.
David

If it is of any interest, I had a cage made by Performance and Protection a few years ago, a fully welded RAC compliant item for rallying. Its bolt in but you need the body off first. I was very happy with the quality of P&P and would recommend them. I had quite a bit of dialogue with RAC MSA and could not get them to agree the rear stays intersecting with the rear hoop low enough to stay in the body work' instead they will pass through the rear window with a clevis connection.