Roll bar for a street car? Options

[CptTripps]

While talking with my uncle about the build I have underway, he asked a question that I hadn't spent a lot of time considering...what if I roll the thing?

Fair point. I'm going to be well north of 300HP, and while I've upgraded the suspension, chassis and brakes...I haven't put a lot of thought into the cabin.

Is there a way to do a roll-bar that would still maintain the "street-ability" of the car, while adding some protection for my noggin?

I was thinking about something like the attached photo, with additional tubing added where I have the green.

Being able to use the stock seats and seat-belts is important.

Does someone make something like this, or am I finding someone local to build me one? I'd be welding it into the car, and on top of the Engman stiffening kit.

[Steve]

The built in roll bar, should be fine if you roll it, unless you have major rust issues. In the early 80's one of my friends went off the mountain side to avoid hitting a truck passing in his lane. The 914 rolled at least five times and the built in roll bar did not collapse. It was a little rounded on the sides and the windshield hoop was also bent. Both the occupants survived with only scratches and bruises. For track use, you might be required to put in a roll bar anyway. For the street and my 3.2, flairs etc, I just went with the Engman kit to strengthen the car.

[stugray]

(IMG:style_emoticons/default/agree.gif) You already have a rollbar.

I would consider the stock bar to be better than most cars with roofs.

[r_towle]

if you do not plan on wearing a helmet, a stock car is correct.

The issue with a rollbar (at least something to think about) is there is documentation out there that shows you can do more damage to the occupant with the rollbar (hitting your head in a roll over against the roll bar) then any potential savings it might deliver.

Abel, my son (Rocket here) rolled his, the roll bar was fine, windshield held up fine...the rest of the car did its job and collapsed, but the passenger compartment is pretty solid if you have no rust.

If you are working with an early chassis, I would suggest you upgrade to the 73 or newer doors that do have side impact bars welded in....or modify yours.

I looked long and hard before I gave my son that car,,,,cause I figured it might happen.
I did not find one wreck that the occupant compartment could not sustain a person....
All of the typical wrecks took the hit fairly well.

Now, if you go do a carrera GT type thing....well even the best protection wont help you.

Rich

[CptTripps]

Great info guys. I'll skip the extra roll-bar then.

I've got a 75 chassis and was planning on double-checking the welds inside the doors to make sure everything was still solid. I'd rather have a car that was 100lb heavy...and safe.

[r_towle]

seems like the common opinion is its less safe without a helmet.

RIch

[Dave_Darling]

I wonder if adding a doubler to the stock Targa bar would do any good? Sort of like the Engman long kit, but for the Targa bar.

--DD

[SirAndy]

I'm surprised the "you're going to die!" crowd isn't out in force yet.

According to them, a rollbar in a street car is certain death, might as well shoot yourself now ...
(IMG:style_emoticons/default/rolleyes.gif)

(IMG:http://www.914world.com/bbs2/uploads/post-2104-1386213123.jpg)

[Steve]

I'm surprised the "you're going to die!" crowd isn't out in force yet.

According to them, a rollbar in a street car is certain death, might as well shoot yourself now ...
(IMG:style_emoticons/default/rolleyes.gif)

(IMG:http://www.914world.com/bbs2/uploads/post-2104-1386213123.jpg)

A properly padded cage is a diferent story. He only asked about a roll bar, regarding rollovers. In the case of a car accident or running into a rock like that other guy did I would rather have your properly padded cage.

[ThePaintedMan]

... along with appropriately adjusted 5 point harnesses to keep your body and skull from flying into said rollbar.

[stugray]

As someone who has personally rolled a car, I refuse to buy a car without roll protection.
i.e: Boxster, Solstice, miata, etc....

However I know for a fact that the flimsy looking roof on a 71 Ghia is plenty strong to support the entire weight of the car and two occupants....

[jeff]

I'm not against using a roll bar/cage for the street,
-Use padding on the tubes near your body
-have at least 2" of clearance from your Helmet to the bar( this will be about 4" without helmet)
Make sure your bar/cage tube are welded in compression& shear..
Be sure your confident about your welding ability,
If you have large gaps in your coped tube ends your cage/ bar will be weak
Reconsider stock seat belts, if you have a good cage I'd wear harnesses and snug them up good
Don't put the dash bar where your knees will hit it ...
I can't think of anything else...

[CptTripps]

I'd thought about maybe working on a reinforcement for the targa bar. Maybe a rectangular piece across the top, contoured to the body. Then two pieces up the sides from inside the targa bar. I'd have to draw it out, but it'd likely be more work than it's worth.

[gryphon68]

What about tucking a one piece main hoop in under the targa bar outside the passenger compartment? Run it down to the rear rails and brace forward and rearward. . . .

[carr914]

I wonder if adding a doubler to the stock Targa bar would do any good? Sort of like the Engman long kit, but for the Targa bar.

--DD

The Stock Targa Bar is Strong enough to do anything that is coming it's way

[damesandhotrods]

Maybe I’m putting too much faith in Porsche’s engineers, but if the windshield alone can hold up a sedan delivery I am confident the Targa would support the weight of the 914…

[jeff]

http://m.youtube.com/watch?v=QQh56geU0X8

[CptTripps]

http://m.youtube.com/watch?v=QQh56geU0X8

One of my favorite episodes.

[TeenerTim]

http://tangerineracing.com/rollcages.htm
(IMG:http://www.914world.com/bbs2/uploads_offsite/tangerineracing.com-8253-1391094376.1.jpg)

[larryM]

just buy a bolt-in AutoPower

- add the gurney brace if you think you want to be scca legal

it significantly stiffens the chassis - you will not regret it

or - if you do - it is easy to unbolt & sell

.