Roll Cages

[SamE30]

i know its off topic but what about a 4 point harness W/ out a roll cage? is it safe? JW.

Think about that like this. You roll your car with a standard seatbelt, your body moves to the side, most likely to the passengers seat. You roll it with your upper body held in place, your fucked.

[ChItalian1027]

that would be really cool if u do run a cage.

is ur gonna be a track rat or DD or both?

[RouteZeroDesign]

A good roll cage may save your life, a bad one will kill you.

Roll cages in any case where you are not wearing a helmet are slightly stupid.
In the case of a crash, with your body flying about the place, a roll cage is just a very very hard place to hit off.

In most cases its either a case of going all the way or not at all.
But in some, such as the Porsche GT3 RS, it is acceptable.
Porsche justified fitting a rollcage for a few reasons.
1) It is rear only
2) There is a harness bar, so 3 or 4 point belts can be worn
3) The seat back is very large, so this will prevent any stray body parts from reaching back there in a crash.



I would never fit a roll cage into a daily driver but after all, there are allot of ways to stiffen up the chassis other than roll cages.
If you look at the Scoot rx7, koseki-san didn't feel the need to install a rollcage, but instead he strengthened the shell through seam welding, strategic braces and reinforcement plates along with filling the frame cavities.

Also, dont forget about the lockable 3 point seat belts.
Where you fit a new buckle that locks the lap belt in place, but allows you to move your top half, so if your reaching to get something, or folding out of the way in a rollover, it is a win win situation.
This is used allot in the stunt driving buisness

[Massimo]

Yeh here in Aust they are very strict on this. I did some resuch in to the car and harness thing here is what i know according to Aust compliance. For street use you may only have a halve cage positioned so that when your seat is in the upright position all the way back there is about a 10cm of clearance between the cage and back of the seat. Then if you want to install a harness you must have it bolted to the cage and professionally fitted and approved.

I agree that if you are going to put a cage and harness in go all the way or not at all. I know that sparco dose a have cage boltin kit which is fia approved which should be satisfactory for you uses. you wont get much stiffness from a half cage, so you might as well get a boltin and then weld some plates and what not for more stiffness. You dont get much improvement from cages untill you get to the 10 point and 12 point cages and even then you need an engineer to look at it to optimise you stiffness.

I must say that a street car with a cage dose look the shit though.