2012 BRZ/FR-S Stock Class Autocross Discussion

[EMguy]

Originally Posted by Dark_Angle

I will probably leave it all alone because changing weight will change the handling characteristics of the car.

Yes, it will change the handling characteristics of the car.... For the better.

Less weight is always a good thing. (so long as it doesn't compromise safety, structural integrity, etc.)

[Sccabrz192]

Originally Posted by jdrxb9

I'll be surprised if we see a TSB from Toyota because: AFAIK they've been putting the alignment/crash bolt info in the FSM for a while now; the FR-S manual shows the procedure with only one alternate bolt (which is actually the lower bolt used in the upperr position instead of the upper lower bolt); the bolts do not have part numbers anything like the normal Toyota alignment/crash bolts. (link,link)

Since I'm pretty sure I'm getting a BRZ, I'm hoping we 1) don't need much static camber due to low roll, and 2) I'm right about no FR-S TSB

Wow, 3/4 degree adjustment? Lol

[Scooby South]

hmmmm..sorry.didnt know the omplete stock ruleset....but I would expect lots of griping about this car
...already hearing rumblings of the Miata contengent bitching about it....and 3/4 of a degree is better than nothing...

Bill

[jdrxb9]

Originally Posted by EMguy

Lightweight Wheel Options in 17x7, 5x100, ET 42-54:

-Kosei K4R (14 lbs)
-Buddy Club P1 Racing SF (17.4 lbs)
-Team Dynamics Pro Race 1.2 (17.3 lbs)*

*These won't be in stock in the right size, but TD will custom make individual orders to your specs with a 6-8 week lead time. They're reasonable priced, and 17.3 lbs.

Originally Posted by Sccabrz192

Following bill's lead, you do have some rota options...

GR-A, Boost, and circuit 10 are available in +48
Subzero in a +45

Ill edit this Post if i find others.

some more:

Kosei K1-TS      avail now in ET50 - listed at kosei's website in 42, but can't find a source in that offset
Kosei K3         listed at kosei's website in 42, can't find a source
Enkei            EV5,G5,Klamp,T-Fork - all 18+ lb, 45 or 48
Enkei            RPF1 - enkei lists a ET48, but can't find a source
Enkei            RPF1,RS+M,PF01 - all options at ET43 or ET45 with custom lug pattern drilling
Motegi           MR121 ET48 17lb
Tenzo            DC-5 and DC-6 ET42 ~17.5lb
Kyowa            228 ET42 ~17lb

[Scooby South]

Originally Posted by Dark_Angle

So removing the exhaust and adding the shorty pipe is probably a no no.

nope....look at my thread...towards the end and you will see the pipe I am talking about.....that is legal for stock

Bill

[Dark_Angle]

Originally Posted by EMguy

Yes, it will change the handling characteristics of the car.... For the better.

Less weight is always a good thing. (so long as it doesn't compromise safety, structural integrity, etc.)

Dont forget that if you lose weight then you will be messing with the distribution that I am sure that scion designed for. This could cause over/understeering characteristics. Yes you are saving weight but at what cost.

If you take off the same amount from the front of the car you would be back to the origiional distribution.

I bet you could drop about 100lbs. from the rear without trying very hard. Spare tire and tools along with the exhaust, truck carpet. Might get you close.

[Scooby South]

trunk junk has already been weighed at 35lbs...muffler is about 40lbs..

Bill

[Dark_Angle]

Originally Posted by Scooby South

trunk junk has already been weighed at 35lbs...muffler is about 40lbs..

Bill

Not bad

How about rear seat? The fold down and seat itself.

[Sccabrz192]

Cant remove seats. You will be reducing the yaw moment by removing trunk junk and muffler weight but slightly moving the cg location forward. In the grand scheme of things, you wont be able to tell from a vehicle dynamic standpoint.

[Dark_Angle]

Seats

Per class rules???

[AX_FRS]

Per class rules, you can't remove seats. You know, you could actually download the rule book in its entirity from SCCA for free. And the stock section isn't that long, only about 9 pages (if you don't count all the clarifications and classing pages).

[Dark_Angle]

That book gives me a head ache. I currently am going through a build and the SCCA rule book makes me go cross eyed. durrrrr

[Sccabrz192]

What class is your build for? Classes like mod and prepared can be really confusing. But stock, ST, and SP are pretty straight forward.

[Dark_Angle]

Street prepared if I remember correctly. I tossed that book in the trash and said screw it I was going to build the car I wanted and race it in whatever class. I gave up on trying to please the book.