Gen 2 Autocross Classing | Write your letters! - Page 10 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

dragoontwo · 01-21-2022, 09:44 AM

Quote:

Originally Posted by DocWalt

Would also be nice to go bolt to bolt on the subframe too

I'm not sure that they changed the subframe mount points, but just extended the rear suspension bits by 10mm.

I made a mistake in my previous statement. let me go back and fix it.

DocWalt · 01-21-2022, 10:03 AM

I thought the changes were at the knuckle side according to CSG Mike?

dragoontwo · 01-21-2022, 10:16 AM

I must have missed that post. A quick glance at the parts page shows the RLCA and knuckle being the parts specific to the 2022. I suppose my idea was wrong. However with the only change in the RLCA being that the hole moved outboard 10mm, my shock is now where it would have been on the previous model.

After some digging, I found this post by MikeCSG that states the rear measurements are identical with the change being in the rear quarter panel. In a post on the next page, he attributes the track width increase to the wheel width increase. So it looks like my theory was totally wrong.

Racecomp Engineering · 01-21-2022, 01:44 PM

Quote:

Originally Posted by dragoontwo

Like a flip chip for mountain bike geometry...

The Cusco rear arms have a flippable thing that changes the motion ratio.

The arms still use a pillowball so not legal but just showing what it looks like.

- Andrew

timurrrr · 01-21-2022, 02:30 PM

Quote:

Originally Posted by dragoontwo

After some digging, I found this post by MikeCSG that states the rear measurements are identical with the change being in the rear quarter panel. In a post on the next page, he attributes the track width increase to the wheel width increase.

But the '17–20 PP wheels were also 7.5" wide, and neither of those brochures call out a different track with for PP models.
I thought track width is measured from the center of the tire tread to the center of another tire tread, so it shouldn't change with wheel/tire width, assuming the same wheel offset?
Then also why 10 mm, not 12 or 13?

Quote:

Originally Posted by CSG Mike

dimensionally identical, when it comes to track width

That being said, I have no idea how track width is measured by manufacturers, down to the millimeter.
Could be more what you'd call a "guideline" ballpark number than an actual precise measurement.

bholliday · 01-21-2022, 02:59 PM

I'm guessing the track width for the brochure is probably measured in the CAD models. You certainly can get a nominal measurement that is way more precise than 1 mm.

Simmons · 01-24-2022, 05:39 PM

Being the wheels are 7.5 wide all around, why don't they claim the front track being wider?

strat61caster · 01-24-2022, 07:10 PM

Quote:

Originally Posted by Simmons

Being the wheels are 7.5 wide all around, why don't they claim the front track being wider?

I assumed they measure based on the wheel hub as there was no track width change on the special edition cars with 7.5’s iirc.

The wheel isn’t centered on its mating surface to the car so wider wheels do not necessarily result in no change to track width as measuring wheel center to wheel center.

Brock H. · 01-26-2022, 12:49 PM

Stupid question time.

Double checked the rules, but I figured I'd ask to double check. As Subaru has no "Manufacturer" camber bolts for the BRZ as defined in 13.8.E, aftermarket camber bolts are also a no, correct? How does one realistically get any front camber on these besides loosening everything and using the hole tolerances to get camber?

dragoontwo · 01-26-2022, 01:00 PM

Quote:

Originally Posted by Brock H.

Stupid question time.

Double checked the rules, but I figured I'd ask to double check. As Subaru has no "Manufacturer" camber bolts for the BRZ as defined in 13.8.E, aftermarket camber bolts are also a no, correct? How does one realistically get any front camber on these besides loosening everything and using the hole tolerances to get camber?

Factory "crash" bolts. Basically the lower 14mm bolts placed into the top 16mm holes. They're pretty cheap at the dealer.

I'm not sure if these are legal though.

Brock H. · 01-26-2022, 01:07 PM

Quote:

Originally Posted by dragoontwo

Factory "crash" bolts. Basically the lower 14mm bolts placed into the top 16mm holes. They're pretty cheap at the dealer.

I'm not sure if these are legal though.

That was my guess at the moment.

MacSpeed · 01-26-2022, 03:12 PM

They're legal. same part number as the 1st gen cars. Its in the service manual.

MMoore4545 · 02-08-2022, 10:29 AM

Has anyone gotten a letter written to STAC regarding the RCLA's?

Banannie · 02-08-2022, 10:32 AM

Quote:

Originally Posted by MMoore4545

Has anyone gotten a letter written to STAC regarding the RCLA's?

And ask for what? I'm not asking to be controversial, just truly curious - the STAC won't make allowances for a single car

01-21-2022, 10:03 AM	#128
DocWalt Senior Member Join Date: Oct 2013 Drives: '22 BRZ Location: PA Posts: 1,833 Thanks: 2,298 Thanked 1,472 Times in 767 Posts Mentioned: 24 Post(s) Tagged: 2 Thread(s)	I thought the changes were at the knuckle side according to CSG Mike? __________________ - Ken. H DocWalt's WRB 2013 BRZ Build Thread \| DocWalt's 2022 WRB BRZ Build Thread

01-21-2022, 10:16 AM	#129
dragoontwo Senior Member Join Date: May 2020 Drives: 22 BRZ limited Location: Clarksville TN Posts: 1,183 Thanks: 217 Thanked 990 Times in 521 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	I must have missed that post. A quick glance at the parts page shows the RLCA and knuckle being the parts specific to the 2022. I suppose my idea was wrong. However with the only change in the RLCA being that the hole moved outboard 10mm, my shock is now where it would have been on the previous model. After some digging, I found this post by MikeCSG that states the rear measurements are identical with the change being in the rear quarter panel. In a post on the next page, he attributes the track width increase to the wheel width increase. So it looks like my theory was totally wrong. Last edited by dragoontwo; 01-21-2022 at 11:21 AM.

01-24-2022, 05:39 PM	#133
Simmons Senior Member Join Date: Jun 2012 Drives: 2022 BRZ Location: PA Posts: 957 Thanks: 300 Thanked 570 Times in 266 Posts Mentioned: 17 Post(s) Tagged: 0 Thread(s)	Being the wheels are 7.5 wide all around, why don't they claim the front track being wider? __________________ 2022 BRZ 71 STR Sponsors Xero-Limit//Karcepts

02-08-2022, 10:29 AM	#139
MMoore4545 Member Join Date: Apr 2016 Drives: 2022 BRZ Location: Asheville, NC Posts: 35 Thanks: 37 Thanked 23 Times in 16 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Has anyone gotten a letter written to STAC regarding the RCLA's? __________________ '91 Fc3s Turbo '22 Brz Limited MT Too Many motorcycles.

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01-21-2022, 02:59 PM	#132
bholliday Member Join Date: Nov 2014 Drives: 2022 BRZ Premium Location: Tulsa, OK Posts: 37 Thanks: 48 Thanked 16 Times in 9 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I'm guessing the track width for the brochure is probably measured in the CAD models. You certainly can get a nominal measurement that is way more precise than 1 mm.

01-26-2022, 12:49 PM	#135
Brock H. Member Join Date: Oct 2012 Drives: 2022 BRZ, Red Location: Oklahoma City, OK Posts: 45 Thanks: 14 Thanked 22 Times in 14 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Stupid question time. Double checked the rules, but I figured I'd ask to double check. As Subaru has no "Manufacturer" camber bolts for the BRZ as defined in 13.8.E, aftermarket camber bolts are also a no, correct? How does one realistically get any front camber on these besides loosening everything and using the hole tolerances to get camber?

01-26-2022, 03:12 PM	#138
MacSpeed Senior Member Join Date: Sep 2021 Drives: 2022 BRZ Location: FL Posts: 135 Thanks: 71 Thanked 106 Times in 50 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	They're legal. same part number as the 1st gen cars. Its in the service manual.

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