Roll Bar Reduction Surgery - FFCars.com : Factory Five Racing Discussion Forum
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post #1 of 11 (permalink) Old 07-11-2019, 03:12 AM Thread Starter
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Lightbulb Roll Bar Reduction Surgery

I have a Challenge Car and I need to remove a couple of the roll bar appendages. I want as smooth a surface as possible when done. Any suggestions as to limiting the bit of my grinder?


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post #2 of 11 (permalink) Old 07-11-2019, 03:27 AM
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Use a flapper disc on your angle grinder (not sure if that is what they are called in the US) or play it safe and use manual tools. Slow and steady can often be the best way.

Cheers Nigel in South Oz

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post #3 of 11 (permalink) Old 07-11-2019, 01:09 PM
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Barry,

Just out of curiosity, what are you planning to remove?

I have a Challenge Car and have been adding to the roll bar along with other steel modifications.

Jim
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post #4 of 11 (permalink) Old 07-17-2019, 03:33 AM Thread Starter
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Bars to remove

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post #5 of 11 (permalink) Old 07-17-2019, 03:42 AM Thread Starter
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Roll bars

I'm thinking of going to regular roll bars. Once I remove the body, I'll have a better idea about a retrofit.

I just purchased her.

I don't anticipate running on track.

I have a number of Challenge items to sell, by the way...like these seats.

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post #6 of 11 (permalink) Old 07-17-2019, 10:07 AM
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Because the Challenge cars don't have the backbone structure like the street roadsters a significant portion of their chassis stiffness and strength is made up by the cage. Removing it will definitely have a negative impact on the chassis rigidity and strength. Just an FYI...

Jeff
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post #7 of 11 (permalink) Old 07-17-2019, 01:27 PM Thread Starter
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Exactly the type of feedback I'm looking for.

My original plan was just to remove some of the cage...for egress...then I saw one with no roll bar at all...which I would feel unsafe with.

Structural is RELEVANT.

Thank you, Sir!

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post #8 of 11 (permalink) Old 07-18-2019, 11:44 AM
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Hey Jeff

I also have a Challenge car converted to Street/Track Day/Autocross use. I've done a couple other Mark 3's and I don't remember any differences besides the door bars vs the x-brace. Is there more?

Jay
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post #9 of 11 (permalink) Old 07-18-2019, 01:16 PM
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Quote:
Originally Posted by lakeside View Post
Hey Jeff

I also have a Challenge car converted to Street/Track Day/Autocross use. I've done a couple other Mark 3's and I don't remember any differences besides the door bars vs the x-brace. Is there more?

Jay
Yes, as I said above the Challenge chassis does not have the triangulated tubular structure through the cockpit which makes up the trans tunnel and greatly stiffens the chassis. The Challenge car cage produces the same (actually more) rigidity without the need for the extra weight of this "backbone".

Jeff

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post #10 of 11 (permalink) Old 07-18-2019, 03:10 PM
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There are other differences to add to Jeff's note.

A crossbar between the roll bar rearward back bars, hidden in the trunk.
The side and rear crossbar around the tank.
Bars forward from the L/R firewall area to the front shock towers.
Cross bar above the firewall 2" square tube.

Most of this isn't obvious in a finished car and there are probably a few other changes.

Jim

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post #11 of 11 (permalink) Old 07-18-2019, 07:53 PM
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The only ones that I've seen removed, including mine, are the left and right shoulder down tubes. 30 years ago when I was racing these wouldn't be any problem. Neither as nimble or as svelte as I used to be, next project is hinging the door skins.
With that be said, the challenge car seems way stiffer than the MK3 I had even with those 2 bars cut out. It's also a little comforting to have the door bars there.
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