stock springs and upgraded dampers
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Joined: Jul 2003
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From: Lawrence, ks, 66044
stock springs and upgraded dampers
i asked this in another string that just got locked... but i really can't find anything about this in the archive. has anybody run stock springs with upgraded dampers? any suggestions? i'm preparing my crx si for g-stock scca and they allow upgrades in dampers as long as stock springs are used and they are not externally adjustable... any thoughts?
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Re: stock springs and upgraded dampers (KUjonathan)
I saw that other thread, but didn't want to hi-jack it at the time...
I'd say Koni Sports (yellow) SA (single adjustable) would be my first choice.
I noticed you said the dampers need to be "...not externally adjustable...", but where in the SCCA Solo2 rules are you getting this? Or how are you defining ext. adj.? Because this has been legal for quite some time, in fact if it wasn't 100% of the Stock class National Champs would be illegal.
The only major change they made recently (2002-2003) was to limit the number of external adjustments. Since people were getting mega-buck 3 and 4-way adj. shocks made up.
From http://www.moutons.org/sccasolo/Rules/index.html which was taken from the National SCCA Solo Rules.
13. STOCK CATEGORY
.
.
.
13.5 Shock Absorbers
The make of shock absorber may be substituted providing that the number, type, (e.g., tube, lever, etc.) system of attachment and attachment points are not altered, except as noted below. The interchange of gas and hydraulic shock absorbers is permitted. The following restrictions apply:
No more than two separate external shock damping adjustment controls. Gas pressure adjustment is not considered a damping adjustment.
Suspension geometry and alignment capability, not including ride height, may not be altered by the substitution of alternate shock absorbers.
Adjustable spring perches are allowed, but the spring load-bearing surface must be in the same location relative to the shock mounting points as on the standard part. Shims may be used to achieve compliance.
The fully extended length must be within plus or minus one inch of the dimension of the standard part.
Electronically controlled shocks may not be used on vehicles not originally equipped with such units. Vehicles originally equipped with electronically controlled shocks may use the standard parts or non-electronically controlled alternative shocks subject to all requirements of 13.5. Non standard electronically controlled active shocks are not allowed.
The mounting hardware shall be of the original type. The use of any shock absorber bushing material, including metal, is permitted. This does not permit the use of an offset shock absorber bushing. The bushing attaching the end of the strut to the body or frame on a strut type suspension is a suspension bushing, not a shock absorber bushing. Suspension bushings, including but not limited to those which carry the weight of the car and determine ride height, may not be replaced with bushings of a different material or dimension.
To facilitate the installation of commonly available aftermarket shock absorbers, struts, or strut inserts whose shaft is larger than the center hole of an upper mount assembly, that hole may be enlarged by the minimum amount necessary to accommodate the shock shaft size, provided the following restrictions are met:
the enlarged hole must remain concentric with that of the original configuration;
the enlargement of the hole does not require modification of a bearing (as opposed to a washer, plate, or sleeve);
neither the hole enlargement nor the location of the shock shaft changes any alignment parameter.
A suspension bump stop is considered to be performing the function of a spring. Therefore, the compressed length of the shock at the initial point of contact with the bump stop may not be increased from the standard part, although the bump stop may be shortened for the purpose of installing non-standard shocks. Bump Stops installed externally and concentric with the shaft of a shock may be drilled out to fit a larger diameter shock shaft. Bump Stops may be substituted for the purpose of installing non-standard shock absorbers.
I'd say Koni Sports (yellow) SA (single adjustable) would be my first choice.
I noticed you said the dampers need to be "...not externally adjustable...", but where in the SCCA Solo2 rules are you getting this? Or how are you defining ext. adj.? Because this has been legal for quite some time, in fact if it wasn't 100% of the Stock class National Champs would be illegal.
The only major change they made recently (2002-2003) was to limit the number of external adjustments. Since people were getting mega-buck 3 and 4-way adj. shocks made up.
From http://www.moutons.org/sccasolo/Rules/index.html which was taken from the National SCCA Solo Rules.
13. STOCK CATEGORY
.
.
.
13.5 Shock Absorbers
The make of shock absorber may be substituted providing that the number, type, (e.g., tube, lever, etc.) system of attachment and attachment points are not altered, except as noted below. The interchange of gas and hydraulic shock absorbers is permitted. The following restrictions apply:
No more than two separate external shock damping adjustment controls. Gas pressure adjustment is not considered a damping adjustment.
Suspension geometry and alignment capability, not including ride height, may not be altered by the substitution of alternate shock absorbers.
Adjustable spring perches are allowed, but the spring load-bearing surface must be in the same location relative to the shock mounting points as on the standard part. Shims may be used to achieve compliance.
The fully extended length must be within plus or minus one inch of the dimension of the standard part.
Electronically controlled shocks may not be used on vehicles not originally equipped with such units. Vehicles originally equipped with electronically controlled shocks may use the standard parts or non-electronically controlled alternative shocks subject to all requirements of 13.5. Non standard electronically controlled active shocks are not allowed.
The mounting hardware shall be of the original type. The use of any shock absorber bushing material, including metal, is permitted. This does not permit the use of an offset shock absorber bushing. The bushing attaching the end of the strut to the body or frame on a strut type suspension is a suspension bushing, not a shock absorber bushing. Suspension bushings, including but not limited to those which carry the weight of the car and determine ride height, may not be replaced with bushings of a different material or dimension.
To facilitate the installation of commonly available aftermarket shock absorbers, struts, or strut inserts whose shaft is larger than the center hole of an upper mount assembly, that hole may be enlarged by the minimum amount necessary to accommodate the shock shaft size, provided the following restrictions are met:
the enlarged hole must remain concentric with that of the original configuration;
the enlargement of the hole does not require modification of a bearing (as opposed to a washer, plate, or sleeve);
neither the hole enlargement nor the location of the shock shaft changes any alignment parameter.
A suspension bump stop is considered to be performing the function of a spring. Therefore, the compressed length of the shock at the initial point of contact with the bump stop may not be increased from the standard part, although the bump stop may be shortened for the purpose of installing non-standard shocks. Bump Stops installed externally and concentric with the shaft of a shock may be drilled out to fit a larger diameter shock shaft. Bump Stops may be substituted for the purpose of installing non-standard shock absorbers.
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