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Need assistance interpreting the rules


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Hello Everybody, 

I have a suspension question specifically for STS. My car has rear independent suspension, 2 control arms per side. I'd like to know if using rear adjustable control arms is permitted or not. I can't find anything definitive in the rules. Any insight would be greatly appreciated. 

This is from the latest SCCA rulebook:

STS - 14.8 Suspension

H.Camber kits (also known as camber compensators) may be installed. 
These kits consist of either adjustable length arms or arm mounts (in-
cluding ball joints) that provide a lateral adjustment to the effective 
length of a control arm. Alignment outside the factory specifications is 
allowed. The following restrictions apply:
1. On double/unequal arm (e.g., wishbone, multi-link) suspensions, 
only the upper arms OR lower arms may be modified or replaced, 
but not both. Non-integral longitudinal arms that primarily control 
fore/aft wheel movement (e.g., trailing arm(s) or link(s) of a multi-
link suspension) may not be replaced, changed, or modified.
2. On arm-and-strut (MacPherson/Chapman) suspensions, the lower 
arms may be modified/replaced OR other methods of camber adjust-
ment as allowed by Sections 14.8.B, C, or F may be used, but NOT
both.
3. On swing or trailing arm suspensions, the main arms may not be 
modified or replaced, but lateral locating links/arms may be modi-
fied or replaced.
4. Front wheel drive (FWD) cars with rear beam axles may use shims 
between the rear axle and hubs.
5. The replacement arms or mounts must attach to the original standard mounting points. All bushings must meet the requirements of 
Section 14.8.B. Intermediate mounting points (e.g., shock/spring 
mounts) may not be moved or relocated on the arm, except as in-
cidental to the camber adjustment. The knuckle/bearing housing/
spindle assembly cannot be modified or replaced.
6. Changes in suspension geometry are not allowed except as incidental 
to the effective arm length change.
Note: Many modern suspension designs known by other names, ac-
tually function as double A-arm designs. These include the rear sus-
pensions on 1988-on Honda Civic/Integra, Chrysler/Plymouth/Dodge 
Neon, BMW E36, and most “multi-link” and are covered by Section 
14.8.H.1.

 

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Yes it is, as long as that is the only means of added camber adjustment at the rear. Meaning you can't have both adjustable control arms AND adjustable offset control arm bushings. But either one on its own is fine. 

 

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One of the control arms is for adjusting toe via an adjustment cam. What if i were to use that adjustable control arm to substitute this arm. Could I still use camber bolts?

Screenshot_20210407-180547_Dropbox.jpg

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I think no. 14.8.2 says:

2. On arm-and-strut (MacPherson/Chapman) suspensions, the lower 
arms may be modified/replaced OR other methods of camber adjust-
ment as allowed by Sections 14.8.B, C, or F may be used, but NOT
both.

So you can replace the lower arms, but cannot implement other methods of camber adjustment if you do so. If the camber bolt is there stock, it's OK. But if you're adding it, then it would violate 14.8.2. 

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