Cal Club Autocross Forums

Marshall Grice wrote:why are you trying to calculate the splitter surface area? the only limitation is that it can't stick out more than 6" from the bumper.

"M. Front splitters are allowed and shall be installed parallel to the
ground (within +/-3 degrees fore to aft) and may extend a maximum
of 6 inches from the front bodywork/fascia as viewed from
above"

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you should read the whole thing, but the short story is "B" is the correct answer.

L. Aerodynamic Aids: Wings may be added, removed, or modified. Non-OE wings may only be attached to the rear deck/hatch area behind the centerline of the rear axle. The total combined surface area of all wings shall not exceed 8 square feet as calculated per Section 12.9. The number of wing elements is limited to 2.
...
M. Front splitters are allowed and shall be installed parallel to the ground (within +/-3 degrees fore to aft) and may extend a maximum of 6 inches from the front bodywork/fascia as viewed from above. Splitters may not extend rearward past the centerline of the front wheels. No portion of the splitter may extend beyond the widest part of the front bumper/fascia as viewed from above.

Marshall Grice wrote:yeah...what rules are you guys reading. for SM/SSM it's 8sqft of wing plus 6" of splitter. the end.

Marshall Grice wrote:yeah...what rules are you guys reading. for SM/SSM it's 8sqft of wing plus 6" of splitter. the end.

Christine Berry wrote:

Marshall Grice wrote:yeah...what rules are you guys reading. for SM/SSM it's 8sqft of wing plus 6" of splitter. the end.

Imagine a 8 Sqft wing on the back of a miata...

Christos Adam wrote:

Marshall Grice wrote:yeah...what rules are you guys reading. for SM/SSM it's 8sqft of wing plus 6" of splitter. the end.

Is this really confirmed?
I would not assume that just by readying the quoted text above... but granted that I don't have experience interpreting the rules while you guys do...

L. Aerodynamic Aids: Wings may be added, removed, or modified.
Non-OE wings may only be attached to the rear deck/hatch area
behind the centerline of the rear axle. The total combined surface
area of all wings shall not exceed 8 square feet as calculated
per Section 12.9. The number of wing elements is limited to 2.
Wings, and any component thereof, may not extend beyond the
vehicle width, as defined by the outermost portion of the vehicle
doors, less mirrors, door handles, rub strips, and trim. In addition,
no portion of the wing or its components may be more than
6" forward of the rear axle, more than 0" beyond the rear most
portion of the bodywork, or more than 6" above the roofline of
the vehicle, regardless of body style. For convertibles and roadsters,
the highest portion of the windshield frame will be considered
the highest portion of the roof.
Reinforcements to the wing mounting area may be used, but
may serve no other purpose. Body panels to which a wing
mounts must remain functional (e.g. trunk lids and rear hatches
must open). Wing endplate surface area is limited to 200 square
inches each and limited to a maximum of two.

M. Front splitters are allowed and shall be installed parallel to the
ground (within +/-3 degrees fore to aft) and may extend a maximum
of 6 inches from the front bodywork/fascia as viewed from
above. Splitters may not extend rearward past the centerline of
the front wheels. No portion of the splitter may extend beyond
the widest part of the front bumper/fascia as viewed from above.

F. Addition of spoilers, splitters, body kits, rear wings and nonfunctional
scoops/vents is allowed. The intent of this allowance
is to accommodate commonly available appearance kits, and
replicas thereof, which have no significant aerodynamic function
at Solo speeds. Body kits are limited to bumper covers,
valances, side skirts, and fender flares. Standard parts may not
be removed except for the substitution of spoilers, rear wings,
bumper covers and valances. Rear wings must attach only aft of
the rear wheel centerline.
The allowances regarding wings and spoilers only allow swapping
like for like if the original device was not an OE option as
configured by the factory, i.e. a spoiler for a spoiler or a wing for
a wing. If a vehicle is available without a wing or spoiler from
the manufacturer then either can be installed.
Surface area of all splitters, spoilers and rear wing (see 12.9)
shall not exceed 5 square feet in sum total. Substitution of rear
spoilers or wings must retain any original third brake light functionality
unless otherwise equipped. No underbody panels may
be added or substituted. The drilling of holes for the purpose of
mounting these pieces is permitted.

Christos Adam wrote: Is this really confirmed?
I would not assume that just by readying the rules (as Christina quoted)... but granted that I don't have experience interpreting the rules while you guys do...

F. Addition of spoilers, splitters, body kits, rear wings and nonfunctional
scoops/vents is allowed. ... Body kits are limited to bumper covers,
valances, side skirts, and fender flares. Standard parts may not
be removed except for the substitution of spoilers, rear wings,
bumper covers and valances...
Surface area of all splitters, spoilers and rear wing (see 12.9)
shall not exceed 5 square feet in sum total.

Jason Isley BS RX8 wrote:

Christos Adam wrote: Is this really confirmed?
I would not assume that just by readying the rules (as Christina quoted)... but granted that I don't have experience interpreting the rules while you guys do...

The rules are never confirmed. They are just placed in book for fun.

Christos Adam wrote:
The point is that the N1 advice that I always hear is that If the rule book doesn't say something clearly don't assume... that's why I'm asking if the assumption is valid... since I didn't read anywhere that the wing area doesn't include the splitter.