SCCA C Stock Discussion

[Kido1986]

Originally Posted by JRP

I have an FR-S and I'm building it to run CS for the rest of this year and will see if I want to stay in Stock or move to another class next year. I checked with the Scion dealer and they don't have a part number for a "Crash/Camber bolt" and when I checked with the Subi dealer they said the top bolt is a camber adjusting bolt from the factory and don't list a part number for the camber bolt; would you happen to have the part number for the camber bolt? I'll be installing the Koni sport shocks this weekend so I'll be able to see it the top bolt is infact an adjustable bolt.

Also, do you feel the car needs the bigger front sway bar? I have the 22 mm Stano bar on order but don't want to put it on if it is not necessary. The bar is on backorder until the beginning of July and we have a race Fathers Day weekend so I'll get a good feel for the car with the stock bar then.

Jim
'88 Celica GT -> '88 Celica GTS -> '88 Celica w/ 3.0 V6 swap -> '92 MR2 -> '11 Scion tC -> '13 Scion FR-S
Our local autocross track : http://www.ssccmedford.org/track.html

Toyota Part # - SU003-02818

And yes on the bar. The BRZ was way too tail happy stock and the FR-S has more oversteer-prone springs than my BRZ. You're going to quickly find yourself chasing the rear... a lot.

What tires are you running?

[JRP]

Originally Posted by Kido1986

Toyota Part # - SU003-02818

And yes on the bar. The BRZ was way too tail happy stock and the FR-S has more oversteer-prone springs than my BRZ. You're going to quickly find yourself chasing the rear... a lot.

What tires are you running?

I will be running the ADVAN AD08 because I have 2 friends with BRZ's that run in STX and there is only one other car that runs in CS, at our local track. I think with a "Stock" setup I can at least keep up both my friends cars. Next year if I stay in Stock I'll run the R comp tires.

I've read that the BRZ has "slightly" stiffer springs and softer shocks than the FR-S. Is that the case? That might explain the tail happiness of the BRZ. I'm trying to determine if I need a front bar. I suppose I could try the stock, then the Strano bar and see which reacts the best.

[qoncept]

Originally Posted by JRP

I've read that the BRZ has "slightly" stiffer springs and softer shocks than the FR-S. Is that the case? That might explain the tail happiness of the BRZ. I'm trying to determine if I need a front bar. I suppose I could try the stock, then the Strano bar and see which reacts the best.

The spring rates on the FR-S are much more rear biased (153/195 on the BRZ vs 131/211 on the FR-S). I don't think there has been anything conclusive but it looks like the struts are valved to match.

[JRP]

Originally Posted by qoncept

The spring rates on the FR-S are much more rear biased (153/195 on the BRZ vs 131/211 on the FR-S). I don't think there has been anything conclusive but it looks like the struts are valved to match.

Are you saying the spring rate in the rear of the cars are "stiffer" than the front? I'm going with the Koni sport shocks so the valving of the stock strut won't matter much.

[xwd]

Originally Posted by qoncept

The spring rates on the FR-S are much more rear biased (153/195 on the BRZ vs 131/211 on the FR-S). I don't think there has been anything conclusive but it looks like the struts are valved to match.

I've had both struts on a shock dyno, they have the same exact valving. Only the springs are different (have had them on a spring dyno as well).

Yes the cars have stiffer springs in the rear.

[Kido1986]

Originally Posted by JRP

I will be running the ADVAN AD08 because I have 2 friends with BRZ's that run in STX and there is only one other car that runs in CS, at our local track. I think with a "Stock" setup I can at least keep up both my friends cars. Next year if I stay in Stock I'll run the R comp tires.

I've read that the BRZ has "slightly" stiffer springs and softer shocks than the FR-S. Is that the case? That might explain the tail happiness of the BRZ. I'm trying to determine if I need a front bar. I suppose I could try the stock, then the Strano bar and see which reacts the best.

Just remember before getting started on R Comps next year that 2014 is the last year for R Comps in stock (will be called SR class and will be supplemental for the new Street class).

Also, AD08s are legal to run RTR, just incase you have other RTR cars locally to run against.

And as pointed out, the shocks are the same on the two cars, just different spring rates between them (I do prefer the BRZs rates for stock/RTR).

[edj]

you can dial out the oversteer with the Koni shocks but you end up with a fair
amount of low speed understeer. go ahead and order the front bar.

the FR-S has stiffer rear springs than the BRZ but you will not notice it on the street.
you may be able to tell the difference on the track but it will be slight.

[Kido1986]

Originally Posted by edj

the FR-S has stiffer rear springs than the BRZ but you will not notice it on the street.

I definitely did notice on the street when driving about 4/10ths. It wanted to slide much easier anytime you added throttle. Haven't tracked an FR-S though.

[JRP]

I wonder what the combination of BRZ front and FRS rear springs would be like? Not legal for Stock but could be used in STX if the combo was good.

[Kido1986]

The car definitely needs more front spring so doing that isn't worth the labor IMO. For a cheap STX setup, do RCE Springs then add Koni shocks as budget allows.

[oTaGGeDo]

Am I the only one that can't keep traction durin Auto x to get a decent time I mean I have a great time but just drifting everywhere if I try and power through anything but I've only went once and car is still on stock wheels going to all of them from now on though

[xwd]

The stock tires are pretty terrible for autocross and putting power down.

Also if you haven't had an alignment done I would start there, it can also drastically change how the car behaves if it's off.

[neurokinetik]

Originally Posted by JRP

I wonder what the combination of BRZ front and FRS rear springs would be like? Not legal for Stock but could be used in STX if the combo was good.

That, combined with the rear swaybar disconnected is my winter setup. It gives a nice balance in the snow, but it's not something I'd consider a "hot ticket" setup for STX, even on the cheap.

[JRP]

This past weekend I the smaller camber bolt on the top of the steering knuckle to strut mount and my stock street tires are very close to the struct tube; how does a 245 tire on a stock dimension rim fit with the camber bolt?