steering knuckles - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

racingfool · 01-08-2022, 01:30 PM

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?

weederr33 · 01-08-2022, 01:58 PM

I believe Savage Geese said they are the same and are easily swappable if you're so inclined.

raisingAnarchy · 01-08-2022, 02:37 PM

Only $340 each from Subaru! lol
https://parts.subaru.com/p/Subaru_20...8311CC010.html

PLF69 · 01-08-2022, 03:05 PM

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)

Spuds · 01-08-2022, 04:56 PM

Quote:

Originally Posted by PLF69

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.

PulsarBeeerz · 01-08-2022, 06:54 PM

They will lessen the un-sprung weight as well. I assume there are published weights somewhere of each.

timurrrr · 01-08-2022, 08:30 PM

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.

timurrrr · 01-09-2022, 12:29 AM

Quote:

Originally Posted by PulsarBeeerz

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

2013-2020 Steel knuckles: 12.41lbs each
2022 Aluminum Knuckles: 9.08lbs each

3.33 lbs less each (6.66 lbs net weight less)

timurrrr · 01-09-2022, 12:31 AM

Quote:

Originally Posted by racingfool

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

Blighty · 01-09-2022, 04:09 AM

Quote:

Originally Posted by Spuds

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.

Blighty · 01-09-2022, 04:19 AM

Quote:

Originally Posted by racingfool

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.

PLF69 · 01-09-2022, 10:31 AM

Quote:

Originally Posted by Blighty

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.

PBR · 01-09-2022, 10:45 AM

Quote:

Originally Posted by Blighty

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.

RZNT4R · 01-09-2022, 07:12 PM

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.

01-08-2022, 01:30 PM	#1
racingfool Senior Member Join Date: Feb 2020 Drives: Miata Location: Seattle Posts: 241 Thanks: 86 Thanked 107 Times in 68 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	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?

01-08-2022, 01:58 PM	#2
weederr33 Airborne at your service Join Date: Sep 2014 Drives: '17 BRZ Series.Yellow Location: El Paso, Texas Posts: 6,140 Thanks: 4,416 Thanked 5,357 Times in 2,824 Posts Mentioned: 33 Post(s) Tagged: 2 Thread(s)	I believe Savage Geese said they are the same and are easily swappable if you're so inclined. __________________ Series.Yellowbird - http://www.ft86club.com/forums/showthread.php?t=122135 MS, CSCS, TSAC-F, CPT

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01-08-2022, 02:37 PM	#3
raisingAnarchy Member Join Date: Aug 2018 Drives: '20 Tundra, '84 SpecE30 Location: OH Posts: 35 Thanks: 28 Thanked 20 Times in 13 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Only $340 each from Subaru! lol https://parts.subaru.com/p/Subaru_20...8311CC010.html

01-08-2022, 03:05 PM	#4
PLF69 Member Join Date: Dec 2021 Drives: 2020 M340i, 2022 BRZ Location: Québec, Canada Posts: 21 Thanks: 36 Thanked 5 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	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)

01-08-2022, 06:54 PM	#6
PulsarBeeerz Senior Member Join Date: Mar 2017 Drives: JRSC BRZ Location: Dayton, OH Posts: 903 Thanks: 661 Thanked 719 Times in 384 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	They will lessen the un-sprung weight as well. I assume there are published weights somewhere of each.

01-08-2022, 08:30 PM	#7
timurrrr Senior Member Join Date: May 2019 Drives: 2022 GR86 Location: Between Sonoma and Laguna Seca Posts: 1,676 Thanks: 2,109 Thanked 1,250 Times in 694 Posts Mentioned: 28 Post(s) Tagged: 1 Thread(s)	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.

01-09-2022, 07:12 PM	#14
RZNT4R Professional Mechanic Join Date: Apr 2010 Drives: 2017 86 6MT Oceanic Location: Quebec, Canada Posts: 745 Thanks: 15 Thanked 565 Times in 340 Posts Mentioned: 12 Post(s) Tagged: 0 Thread(s)	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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