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      08-06-2018, 08:15 AM   #23
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The question I have about the Dinan pieces is, how can the epoxy or whatever fixture they use between the two joints where the metal mounting tabs join the carbon tube be any more rigid (taking loads that flex the chassis a couple mm at most without them) than a hunk of aluminum? I suspect the answer is, meh, either you want pretty carbon fiber in your engine bay or you don't,
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      08-06-2018, 11:14 AM   #24
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I would thing a brace is inly as strong as its weakest kink and given they keep the aluminum c ernter section, any rigidity of the carbon is kost in the entire system and if anything the bar would load and unload at a funny rate or inconsistent rate and lead to breskage in the joints where it attaches to aluminum
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      08-06-2018, 12:54 PM   #25
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Quote:
Originally Posted by Richbot View Post
The question I have about the Dinan pieces is, how can the epoxy or whatever fixture they use between the two joints where the metal mounting tabs join the carbon tube be any more rigid (taking loads that flex the chassis a couple mm at most without them) than a hunk of aluminum? I suspect the answer is, meh, either you want pretty carbon fiber in your engine bay or you don't,
Great point. These are not worth it - especially for over $500.
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      08-06-2018, 12:55 PM   #26
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They’re aluminum. You can lose about 2lb if you chuck them in the garbage

But hey every ounce counce
I am all about every ounce. I just dropped 40 lbs off my e92 by deleting 1 lb here and 1 lb there... I have been skipping breakfast as well. Getting my weight down for track season - haha
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      08-06-2018, 01:35 PM   #27
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Well it's a good thing I bought mine over 4 years ago on sale direct from Dinan for under $300. ...I agree, these are not worth $500. lol
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      08-06-2018, 06:05 PM   #28
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I really believe theze decrease performance and wouldnt uae them if paid
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      08-06-2018, 06:09 PM   #29
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Quote:
Originally Posted by dj_dub View Post
Well it's a good thing I bought mine over 4 years ago on sale direct from Dinan for under $300. ...I agree, these are not worth $500. lol
Thats a really good price, usually see used ones for more than that.
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      08-06-2018, 06:12 PM   #30
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I really believe theze decrease performance and wouldnt uae them if paid
how so? and dont say because they had to use adhesive to bond the CF shaft to the metal end pieces. BMW uses adhesive to hold together parts of the unibody, and require shops that replace certain parts such as quarter panels to be bonded on with adhesive as opposed to welding, so theres no issue with strength. also how do you think CF roofs are installed on e92m3? they are glued on and held in place with rivets...so yah, i dont think these will decrease anybodys performance.
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      08-06-2018, 08:33 PM   #31
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Roof is bonded to steel which is as strong or stronger. Cf attached in anyway to aluminum which is a weaker material pound for pound than CF and thus the center aluinum piece i kept attached to CF pieces which mesns the entire load duribg corneeing is limited by the strength of the weakest piece which is the center aluminum. Given the materials are different in strentgh the load transfer is likely not as uniform as the oem setup that is all one material
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      08-06-2018, 10:27 PM   #32
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The roof skin also takes next to no load. It’s there to keep the wind out of your hair and the sun off your neck

The point is they don’t increase performance and cost $500 to do it

And another poster in this thread accomplished the same aesthetic benefit with $10 in vinyl...

If they are near weightless and stiffer by 500% or 5% id love to see data but it doesn’t exist.

So it’s cosmetic. No bigs. People also buy that fancywide diffuser with holes in it that adds 15lb to the car so whatever you do you
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      08-06-2018, 10:28 PM   #33
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Sure the roof takes a torsional load rich
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      08-06-2018, 10:30 PM   #34
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Sure the roof takes a torsional load rich
No the roof spars do. The skin doesn’t do anything. It sits there. The rivets etc keep inside/outside pressure differential from turning it into a sailplane
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      08-07-2018, 11:09 AM   #35
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Oh ok i thought a roof adds rigidity but I am not an expert!
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      08-07-2018, 11:11 AM   #36
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Oh ok i thought a roof adds rigidity but I am not an expert!
it does. i dont want to argue, but i am in the autobody industry and the roof is classified as structural.
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      05-19-2019, 02:54 PM   #37
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I wanted to go ahead and put this debate to rest for those interested in doing this mod.

I swapped out the OEM ones with the dinan bars with weighing both and the results are in:




They both weigh the exact same amount: 11.4oz for both sides.

Hopefully this helps close the loop on this question of the ages
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      05-20-2019, 03:09 PM   #38
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lol

Thank you for your service
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      05-20-2019, 11:48 PM   #39
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lol thanks for taking the time. they are probably just aluminum all the way through with a carbon dowell and end caps glued on.
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      06-02-2019, 01:12 PM   #40
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Looks like titanium hardware is the only way to get rid of weight with the strut braces...
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      07-28-2019, 10:05 AM   #41
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Quote:
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Looks like titanium hardware is the only way to get rid of weight with the strut braces...
Could you please provide the info on these? I'd like to buy these for my setup!
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      07-28-2019, 04:50 PM   #42
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Quote:
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Quote:
Originally Posted by roastbeef View Post
Looks like titanium hardware is the only way to get rid of weight with the strut braces...
Could you please provide the info on these? I'd like to buy these for my setup!
I got my stuff from ti64.com

This screenshot also includes titanium license plate bolts, so leave those off if you don't want them.
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      07-28-2019, 05:24 PM   #43
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Quote:
Originally Posted by roastbeef View Post
Quote:
Originally Posted by MBimmer2011 View Post
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Originally Posted by roastbeef View Post
Looks like titanium hardware is the only way to get rid of weight with the strut braces...
Could you please provide the info on these? I'd like to buy these for my setup!
I got my stuff from ti64.com

This screenshot also includes titanium license plate bolts, so leave those off if you don't want them.
Awesome, thanks! Did you torque to the same specs as OEM bolts? I think it's 32ftlb. Oh and how's your Karbonius airbox treating you?
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      07-29-2019, 02:40 AM   #44
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Quote:
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Awesome, thanks! Did you torque to the same specs as OEM bolts? I think it's 32ftlb. Oh and how's your Karbonius airbox treating you?
nah, stuff like this i torque to the TAF standard (tight as F). karbonius is nice, but i haven't had time to enjoy it thoroughly. i'm probably going to tap my lower intake box with threaded inserts and use some titanium bolts to replace the airbox lid screws. a few of mine are just done from years of filter cleanings and such.
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