ToyotaAutoXer
09-09-2003, 06:02 PM
I did some searching about whether or not I (along with most other Super Stock competitors) could use my coilovers under the CNAC rules. This is what I found: coilovers are allowed within Super Stock classes under CNAC rules: http://www.vcmc.ca/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=16;t=000013;p=
Current Rule Number: 6.4.E.d.i
Rules To Be Changed: Springs must be the same type as original (coil, leaf, torsion bar, etc.) and use the
original attachment points. Spring perches must remain in the factory location
Change To Read: Springs must be the same type as original (coil, leaf, torsion bar, etc.) and use the original
attachment points. Ride height may only be altered by suspension adjustments, the use of spacing blocks, leaf
spring shackles, torsion bar levers, adjustable coil spring perches, or modification of springs. This does not
allow the use of spacers which alter suspension geometry, such as those between the hub carrier and lower
suspension arm. Springs must be of the same type as the original (coil, leaf, torsion bar, etc.) and except as
noted herein, must use the original spring attachment points. Coil spring perches originally attached to struts
or shock absorber bodies may be adjustable. Spacers are allowed above or below the spring.
Author's Intent: The original interpretation under the 2000 CACC rules was incorrect and motives for this were
selfish and did not present any facts backing up the reasons for the non-allowance of threaded adjustable spring
perches.
One of the main reasons was cost. This is not true that a threaded perch system is significantly more costly
than other means of altering ride height. A review of current pricing of basic Ground Control systems shows a
very reasonable cost structure.
Ease of adjustability: The claim was made that thread perches could be adjusted between heats to gain advantage.
Given the complexity of suspension tuning, any adjustment done between heats and on site would yield
inconclusive/inconsistent results. If adjustability was truly a concern, then the same argument could be applied
to the prohibition of adjustable shock absorbers in Stock and SuperStock categories.
Availability: The argument was presented stating that coil-over kits were not widely available. This is now not
the case in the performance aftermarket. In fact, cars such as the Fiat X-1/9 can only be modified using
threaded spring perches as no other aftermarket alternatives exist.
It follows also that the current rule is inconsistent whereby cars utilizing leaf springs may change mounting
and locations via flip kits and/or shackles when such devices fit under the definition of a spring perch.
Current Rule Number: 6.4.E.d.i
Rules To Be Changed: Springs must be the same type as original (coil, leaf, torsion bar, etc.) and use the
original attachment points. Spring perches must remain in the factory location
Change To Read: Springs must be the same type as original (coil, leaf, torsion bar, etc.) and use the original
attachment points. Ride height may only be altered by suspension adjustments, the use of spacing blocks, leaf
spring shackles, torsion bar levers, adjustable coil spring perches, or modification of springs. This does not
allow the use of spacers which alter suspension geometry, such as those between the hub carrier and lower
suspension arm. Springs must be of the same type as the original (coil, leaf, torsion bar, etc.) and except as
noted herein, must use the original spring attachment points. Coil spring perches originally attached to struts
or shock absorber bodies may be adjustable. Spacers are allowed above or below the spring.
Author's Intent: The original interpretation under the 2000 CACC rules was incorrect and motives for this were
selfish and did not present any facts backing up the reasons for the non-allowance of threaded adjustable spring
perches.
One of the main reasons was cost. This is not true that a threaded perch system is significantly more costly
than other means of altering ride height. A review of current pricing of basic Ground Control systems shows a
very reasonable cost structure.
Ease of adjustability: The claim was made that thread perches could be adjusted between heats to gain advantage.
Given the complexity of suspension tuning, any adjustment done between heats and on site would yield
inconclusive/inconsistent results. If adjustability was truly a concern, then the same argument could be applied
to the prohibition of adjustable shock absorbers in Stock and SuperStock categories.
Availability: The argument was presented stating that coil-over kits were not widely available. This is now not
the case in the performance aftermarket. In fact, cars such as the Fiat X-1/9 can only be modified using
threaded spring perches as no other aftermarket alternatives exist.
It follows also that the current rule is inconsistent whereby cars utilizing leaf springs may change mounting
and locations via flip kits and/or shackles when such devices fit under the definition of a spring perch.