[Anthony1s]

Originally Posted by F87source

I'm not an engineer either, but this is what I think. I believe that the chassis doesn't flex that much anyways to put a significant amount of strain on this brace that it would cause issue. Next I think the mounting point of these braces would be the next weak point way before the brace itself would fail.

I looked it up earlier today, the one I designed would be stronger for this use case, as force is only applied upwards.

Concentric vs Eccentric Bracing:
http://www.seismicresilience.org.nz/...braced-frames/

I always had the ARC brace in my wish list. To the guy asking, both are available here. I was speaking to a guy a while ago with them and he said he received his in less than a week.
https://global.rakuten.com/en/store/...item/10000858/
https://global.rakuten.com/en/store/...item/10002592/

I was also looking up carbon tubes and titanium pipe fittings. I may meet with a fabricator and see about making my design one day. I never wanted it for the stiffness, but to stop my laundry basket from sliding forward and tipping over when I go to do laundry. I have my rear seats removed.

KC Designs is another one that makes a rear brace for the M2
https://www.tw-kcdesign.com/products_6_32_135.htm
https://www.tw-kcdesign.com/about_39.htm

[Bewstd]

in for more details

[Bewstd]

Originally Posted by PLF69

I just ordered the BAF in black, Will report back when I install it.

interested to see this, don't want to lose to much trunk space

[Big Fabri]

this is interesting

[M Fifty]

This is fatuous.

Change my Mind.

[Bee Pee]

Originally Posted by PLF69

I just ordered the BAF in black, Will report back when I install it.

YT vlog below 2:45 to ~ 5mins shows BAF msport rear brace mounted into f20/21 which will be the same for f22/f87

[PLF69]

I have received the brace but will only be installing in a month or two.

It was well packaged and seems very stiff

[Anthony1s]

Originally Posted by PLF69

I have received the brace but will only be installing in a month or two.

It was well packaged and seems very stiff

Weight?

[PLF69]

Originally Posted by Anthony1s

Weight?

9.4 lbs

[Anthony1s]

Thanks. I might get shit for this, partly due to me not having the time right now to explain myself. As well as opening myself up to backlash for me shitting a on product someone bought. But the entire bottom triangle of that brace provides zero structural rigidity or purpose. The design is ridiculously flawed. I mentioned it briefly previously, but seeing more detail pictures shows me it's much worse than I had thought.

[PLF69]

Originally Posted by Anthony1s

Thanks. I might get shit for this, partly due to me not having the time right now to explain myself. As well as opening myself up to backlash for me shitting a on product someone bought. But the entire bottom triangle of that brace provides zero structural rigidity or purpose. The design is ridiculously flawed. I mentioned it briefly previously, but seeing more detail pictures shows me it's much worse than I had thought.

Your point is valid, I don't have very high expectations for this products, I had higher ones for my front M4 alum brace.

I still think that connecting the strut mounting points or at least the body shell close to them can improve how the force is distributed and help it stay in the suspension instead or upsetting and flexing the cars body.

The front alum brace made a considerable difference in this regard.

[Anthony1s]

So, my previous concern is in blue. Which, although the design isn't the best, I concluded maybe there isn't enough force to bend the top bar at the green circle stress point. Maybe it will, maybe it won't. Either way, the design isn't smart, given the way force is applied.

In the new image, force won't even make it that far though, due to the flimsy 90 degree bracket for the lower mounting point. The bracket will bend before force make it that far. The bottom horizontal bar only exemplifies the problem, by giving the direction of force a further degree of stress, rather than if it was just the diagonal bar. Either way, the bottom bracket is weak.

Therefore, the top bar is the only piece of this brace that has any structural rigidity. Depending on how it's mounted, of course. But I'm ignoring how it's mounted and assuming it's mounted in the best way possible. So am only looking at the design of the brace itself.

I would not use this in my car. It's a waste of metal and weight.

[Anthony1s]

Originally Posted by PLF69

9.4 lbs

How much did it cost?

[PLF69]

Originally Posted by Anthony1s

How much did it cost?

280us including shipping to canada

I will be honest, it was a totall covid-semi drunk impulse buy :

[Anthony1s]

Originally Posted by PLF69

280us including shipping to canada

I will be honest, it was a totall covid-semi drunk impulse buy :

Haha. I'm not trying to rag on you for it. Maybe the metal is strong enough for the weak points I see to not matter. I have no idea. I know strong metal can make up for weak design.

One reason I'm curious and thinking so much about this is because I've been exploring making my own out of carbon tubes and aluminum brackets. Maybe what I wanna do isn't even cost effective compared to what's already out there.

So far, I've looked at carbon tube prices online. I still have to find a fabricator that can weld aluminum to talk to about this. I know also the aluminum needs to be heat treated after it's welded to make it t6. Any welding of t6 reverses the heat treatment so it needs to be retreated after welding.

[PLF69]

Here is the top attachment

[Anthony1s]

Originally Posted by PLF69

Here is the top attachment

Oh, interesting. So you drill through the existing metal plate and attach it via a bolt.

[PLF69]

Originally Posted by Anthony1s

Oh, interesting. So you drill through the existing metal plate and attach it via a bolt.

I'm not there yet but I think it bolts to one the two top existing bolts since the holes in the tube are at an angle, probably to help snug the bracket between the two top attachment bolt holes.

I am waiting to order all the rear sound deadening pieces before removing the interior panels and doing both jobs at the same time.

[Anthony1s]

Originally Posted by PLF69

I'm not there yet but I think it bolts to one the two top existing bolts since the holes in the tube are at an angle, probably to help snug the bracket between the two top attachment bolt holes.

I am waiting to order all the rear sound deadening pieces before removing the interior panels and doing both jobs at the same time.

Ahh, that makes sense too.

[nothingman]

Originally Posted by Anthony1s

Looking at the end mounting points, it doesn't look like it'd fit the f87 at all. It really does?

Also the design seems faulty. Directing all of the force to a single point in the center of the top tube. Maybe the steel is strong enough to handle the force. Or maybe I'm totally wrong about it being a problem in the first place. I'm not an engineer, so correct me with why I'm wrong. But I imagine something like this would be more effective. And could be made of lightweight carbon.

Maybe we can commission someone to make Anthony's design if we can get at least (10) commitments. Perhaps AutoID will build it for us and we'll get it in 2022 sorry, couldn't resist

Seriously though, anyone know someone who could fab this up?

[Anthony1s]

Oh, I didn't know other people were interested. I'll ask my race mechanic tomorrow if he knows any fabricators I can speak to about it. Pretty sure the aluminum pieces I need can be sourced from a parts catalog and modified/welded to work. So I really just need someone to weld aluminum, heat treat the alum, and press the carbon tubes into the alum brackets.

[F87source]

Originally Posted by Anthony1s

Oh, I didn't know other people were interested. I'll ask my race mechanic tomorrow if he knows any fabricators I can speak to about it. Pretty sure the aluminum pieces I need can be sourced from a parts catalog and modified/welded to work. So I really just need someone to weld aluminum, heat treat the alum, and press the carbon tubes into the alum brackets.

I know some fabricators in Canada, check out unobtainium welding some of the best welding out there and they do titanium, but prices will likely not be cheap.