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GR86 General Topics (2nd Gen 2022+ Toyota 86) General topics for the GR86 second-gen 86


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Old 01-08-2022, 01:30 PM   #1
racingfool
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steering knuckles

I prefer the looks of the GR but I want the aluminum knuckles from the BRZ.

Are they interchangeable? Geometry the same?

Any thoughts as to why the difference?
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Old 01-08-2022, 01:58 PM   #2
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I believe Savage Geese said they are the same and are easily swappable if you're so inclined.
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Old 01-08-2022, 02:37 PM   #3
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Only $340 each from Subaru! lol
https://parts.subaru.com/p/Subaru_20...8311CC010.html
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Old 01-08-2022, 03:05 PM   #4
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What's the final verdict on this ?

Did Toyota use the steel ones to save cost or because they are stiffer than the aluminum ones (may give better steering feel)
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Old 01-08-2022, 04:56 PM   #5
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Originally Posted by PLF69 View Post
What's the final verdict on this ?

Did Toyota use the steel ones to save cost or because they are stiffer than the aluminum ones (may give better steering feel)
I believe Toyota SAYS they are stiffer, and my guess it is technically a true statement. But is a person actual going to notice a difference in stiffness of the knuckle considering you've got rubber bushings, tires, and coil springs all moving about? Hell no.

Some possibility not considered is that Subaru and Toyota started with some baseline and then it was Subaru that decided to make aluminum knuckles independent of Toyotas engineering team.
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Old 01-08-2022, 06:54 PM   #6
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They will lessen the un-sprung weight as well. I assume there are published weights somewhere of each.
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Old 01-08-2022, 08:30 PM   #7
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Be aware that the aluminum knuckles are not compatible with some BBKs on the market.
Otherwise should swap fine.
Minimal weight savings, probably not noticable.
A lightweight battery is probably better value for money.
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Old 01-09-2022, 12:29 AM   #8
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Quote:
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They will lessen the un-sprung weight as well. I assume there are published weights somewhere of each.
A quick search reveals this:

Quote:
Originally Posted by Opie View Post
2013-2020 Steel knuckles: 12.41lbs each
2022 Aluminum Knuckles: 9.08lbs each

3.33 lbs less each (6.66 lbs net weight less)
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Old 01-09-2022, 12:31 AM   #9
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Quote:
Originally Posted by racingfool View Post
I prefer the looks of the GR but I want the aluminum knuckles from the BRZ.

Are they interchangeable?
https://minkara.carview.co.jp/smart/...4954/note.aspx
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Old 01-09-2022, 04:09 AM   #10
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Quote:
Originally Posted by Spuds View Post
I believe Toyota SAYS they are stiffer, and my guess it is technically a true statement. But is a person actual going to notice a difference in stiffness of the knuckle considering you've got rubber bushings, tires, and coil springs all moving about? Hell no.

Some possibility not considered is that Subaru and Toyota started with some baseline and then it was Subaru that decided to make aluminium knuckles independent of Toyotas engineering team.
According to reports of Toyotas 3 month tuning delay, these knuckles were changed to the old ones at the very last minute.

There is a chance it was done to improve the balance of the car at the limit, Toyota was (again according to reports at the time) really struggling with some of the tuning.
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Old 01-09-2022, 04:19 AM   #11
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Quote:
Originally Posted by racingfool View Post
I prefer the looks of the GR but I want the aluminum knuckles from the BRZ.

Are they interchangeable? Geometry the same?

Any thoughts as to why the difference?
I'd wait for someone to check it out.

Its probably cheaper to just get the GR86 front facia for your BRZ.
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Old 01-09-2022, 10:31 AM   #12
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Quote:
Originally Posted by Blighty View Post
According to reports of Toyotas 3 month tuning delay, these knuckles were changed to the old ones at the very last minute.

There is a chance it was done to improve the balance of the car at the limit, Toyota was (again according to reports at the time) really struggling with some of the tuning.
Interesting, if we keep in mind the front damper tuning is not the same, it could be that the heavier stiffer kuckles were a better match for what they wanted to achieve.

I don't mind it at all they will probably do some additional tuning and changes as the year go on.
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Old 01-09-2022, 10:45 AM   #13
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Quote:
Originally Posted by Blighty View Post
According to reports of Toyotas 3 month tuning delay, these knuckles were changed to the old ones at the very last minute.

There is a chance it was done to improve the balance of the car at the limit, Toyota was (again according to reports at the time) really struggling with some of the tuning.
It's a cheaper part and more durable. Most likely nothing to do with any kind of performance. Aluminum provides better NVH as well as less unsprung weight. But balance and feel? That sounds like a marketing department not an engineer.
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Old 01-09-2022, 07:12 PM   #14
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Cast iron is stiffer. Would you notice? I don't know, would you notice the rear swaybar being mounted to the subframe versus the body? Would you notice the difference between a 18.3mm hollow swaybar versus a 18mm solid one? Would you notice putting the 18mm bar bushings on the 18.3mm bar to get more squish in the rubber and more stiffness?

The aluminium knuckles by themselves are probably not better or worse, they probably don't make that huge of a difference in the overall setup.

I'd spend my money elsewhere on things that would make more of a difference.
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