My BRZ ST* Autocross build
 

Ok...so I am first in line at my local dealer to buy a BRZ..
can't wait...went to Detroit..and Chicago to get/see info on the BRZ/FRS
First off...Fairly impressed with most things on the BRZ...I Plan to AutoCross it Nationally with James Wilson and Christy Carlson in whatever ST Class it falls in.....It seems that I will be one of the first to try and make this thing competitive..I have lots of backing to ensure its competitiveness...
*Kartboy
*Grimmspeed
*Nameless Exhuast components
*Vorshlag/AST
*Whiteline
*SubyDude
and a couple of others to fill in the gaps...

Chances are...this car is 'probably' going to C Stock ...and ST R or X depending on how it drives when the SAC drives it... I think it will be competitive in either class.

What we know:
-Late Model WRX Rear Suspension, Where Rear Sways and Coilovers should be no problem bolting right up. what we don't know...is what the front Suspension will have, stock, for adjustment ..guess we will find out.

-5x100 boltpattern....be that as it may...deal with it... most likely choice for wheels for me....17x9 with a 42 offset should fit the bill nicely.

-Starting off with a mild 245/40/17 tire to begin with (HanKook R-S3's) Class rules will allow a 255 in STR and 265 in STX...that should fill in the wheelwells

-Subaru and Scion are bragging about the handling of this Platform...I will make it better. AST Dual Adjustable Suspension with Camber plates are in the Plan...the big Question is Spring rates...probably will start off with a 10k front and a 6k rear...

-Weight is 2762 lbs seems to be advertised weight...plan is to get it down to about 2600 in race trim including getting rid of the rear muffler altogether and just putting a turndown or a kick on it for weight reduction..

-Torsion Rear LSD..Will be changed out to OSGiken 1.5 Custom Mechanical LSD

-Steering is Rear Steer vs. Front Steer normally found on Subaru...so when you add camber....usually it toes' out the alignment...for general purposes...now. with the rear steer it should toe 'in'...sooo physical alignment will now become the norm at events...we'll see

Purposed Mods:

2013 BRZ Limited (yes with all the goodies...for resale value later)
AST RaceComp Suspension 10k front, 6k rear
Whiteline Adjustable Swaybars
17x9 43 offset Wheels
245/40/17 Hankook R-S3's (Already have)
Frt Camber plates
OS Giken 1.5 Mech LSD
Lightweight Front Seats...maybe TRD Recaro option
Stainless brake lines
Motul Fluids

That would Get me started...
thoughts???

Sorry for the book

Bill

waiting in the wings..;)

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ohhhhh yes....Please..:)...

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A Friend got to Corner weigh a Limited BRZ recently

Total weight 2686

LF – 749 RF – 769
LR – 598 RR – 570

Front – 1518 – 56.5%
Rear – 1168 – 43.5%

Left – 1347 – 50.1%
Right – 1339 – 49.9%

RR X LF – 49.1%
LR X RF – 50.9%

Notes:
Pre-production car
Half a tank of gas
The junk in the trunk weighed 35 pounds



More stuff starting to arrive...
17x9 42 offset..18.7 pds...

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latest on my Helmet....this is getting Close to the final product..some minor revisions..:)

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TRD has an interesting bit for the BRZ/FR-S/FT-86
door Stiffeners..I like...


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But it was actually the door stabilizer that impressed me the most. It’s a very simple upgrade, so simple that most would have probably never though about it. The idea behind it is to use the door as a stiffening implement, so that once it closers it slides this spring-loaded metal section behind the lock grab…
…against this teflon-like plastic part on the door itself. This pushes the door slightly against its hinges further stiffening up the chassis. The result is a better and more direct steering feel though the corners. Every little helps as they say, and TRD have actually patented this little gadget. I Likey..http://brzpost.com/styles/default/xenforo/clear.png.... makes sense and would appear to be an inexpensive worthwhile mod... I WILL be using this little device on my ST* Build..http://brzpost.com/styles/default/xenforo/clear.png

Some things are from some previous threads...just merged them all so everyone can see the progress...:)

Enjoy

Bill

Why 10/6 springs? Assuming you mean 10F/6R isn't the different motion ratios of the struts up front and multi-link in the back going to move it away from neutral and more to the understeer side of things?

kindof a guess right now.....I have 4 National level STR friends thats given me their rates on S2k's and Miatas..we'll see...:) its going to be a crapshoot until its gets sorted for sure.

Bill

S2k and Miata both have double wishbones front and rear, AFAIK.

This car has struts in the front. The difference is in the linkage's leverage that gets applied to the springs. So 8/8 on a strut/wishbone setup is not proportionally the same as 8/8 on a wishbone/wishbone setup.

E36 and later BMW guys will probably be able to help better.

According to RCE, stock spring rates are equal front and rear (185#). At the very least, I would think you would want to maintain the equal rates, perhaps even tending towards slightly stiffer in the rear. Miatas and S2Ks use very different suspension designs and the spring rates you received are meaningless for this application.

What is your previous Autocross experience?

One thought, I've seen those somewhere before, where was it....

oh yea....


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:happyanim:

Originally was going to go with 8k and 8k...until talking to some of those guys thats convinced me to try something more along their lines... its going to be a crap shoot until some testing can be done..:).. luckily I have a couple of decent Subaru Folks to rely on to help it get sorted... :)

exp: about 12 years or so...
campaigned a RS in GS, STS, and SM
campaigned a 05 STi in BSP ...nationally
campaigned a FSP Impreza (not competitive) locally ...was always about 1 -1.5 secs down to Jinx Jordon...but then again...He's fast...;)..

doing a Natinal Build on the BRZ ...soooo :)

Bill

Being able to drive fast and being able to give good suspension advice on a car different than their own don't always go together...

thats funny...:)...and I am as old as you are to know what charactor this is...;)

Bill

I hear ya..:)

My Helmet is coming along Sooooo nicely..:) wahoooooo


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I'm thankful you're posting this all in here, as well as NASIOC...

... but seriously, nice developments and connections within the community.

ha...Thanks..:)... just trying to 'combine' the community a little..:)

Bill

helmet is coming along very nicely!

Justin