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Suspension & Braking Forum by BimmerWorld
Have some questions about suspension or brake setups for your E46 BMW? Get all your answers here!
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Old 07-20-2016, 02:02 PM   #1
Jonathan @ BimmerWorld
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Is a strut brace worth it?



It's an age-old question, and one that's been the topic of many a great e-battle on forums over the years: Is a strut brace worth it?

As much as we all love to see a great internet fight, we prefer to have actual data to make an informed decision or recommendation, so we turned off the proverbial butt dyno and decided to measure the actual amount of strut tower deflection on a BMW.

Read about our results here: Is a Strut Brace Worth It?

Now you can have some data as backup for your next e-fight. ;-)

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Old 07-20-2016, 03:50 PM   #2
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Cool, so the strut towers move about a whole 0.25mm's on average based on that graph.
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Old 07-20-2016, 07:19 PM   #3
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Cool stuff.

Before the question can be answered properly though, do you have before AND after data?

I may have missed it. I just quickly glanced through because I have to go out for the evening, but I love data. But not having both is just trivia.
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Old 07-22-2016, 11:50 AM   #4
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Cool stuff.

Before the question can be answered properly though, do you have before AND after data?

I may have missed it. I just quickly glanced through because I have to go out for the evening, but I love data. But not having both is just trivia.
No "after" data, as the original goal here was to diagnose an issue on a customer's Spec E46. Our answer at that time was basically, "If it ain't broke, don't fix it." If we'd seen a higher amount of deflection on our car, we would've fitted a bar to retest. The results were interesting enough that we wanted to share them.
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Old 07-22-2016, 11:57 AM   #5
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Originally Posted by Jonathan @ BimmerWorld View Post
No "after" data, as the original goal here was to diagnose an issue on a customer's Spec E46. Our answer at that time was basically, "If it ain't broke, don't fix it." If we'd seen a higher amount of deflection on our car, we would've fitted a bar to retest. The results were interesting enough that we wanted to share them.
Ah! Cool. I didn't realize the nature of the testing.

It could prove quite interesting if y'all did before and after testing. That data could be very interesting.

BTW, I was not trying to diss your test or posting the results. That, in and of itself it pretty interesting.

I'm assuming Spec E46 does not allow tying the cage to the strut towers?
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Old 07-22-2016, 12:05 PM   #6
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It's interesting that the curbing produced a negative deflection. Makes you go "Hmmmm......"

It would be interesting to have plots of both X and Y axis deflection. I originally saw the curb notation and assumed it was a positive deflection, but looking at the plot it's clear it's negative. That is particularly interesting because one could expect some Y axis deflection from the frame rail, which would tend (I think) to cause a positive X axis deflection. If there is Y axis deflection, that means it's likely the real X axis deflection is greater than the plot would indicate (going up in Y deflection would increase the distance between the towers, leading to a positive X deflection).
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