Quote:
Originally Posted by AeroModder
On the underside, leave it flat. A lip spoiler on the boot is the equivalent of a gurney flap, just turned upside-down.
If the rules allow, a diffuser at the end of a smooth undertray would be ideal, like this:
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Nah nothing like that allowed, here is part of the rules copied...
BODY
Any modification to body not expressly permitted in this Rulebook is prohibited. Any body that meets the Funny Car body requirements in their entirety is acceptable for TMFC. These bodies must be run as they come from the FIA-accepted molds. Any modification not expressly permitted in the Funny Car (Section 5) body requirements is prohibited. Body model must be no older than 15 years maximum. All bodies must be 2-door sports car, 2-door coupe, or 2-door sedan body of a type originally mass-produced by automobile manufacturer. Must have originally measured 63 inches (160.0 cm) wide or more at centerline of front and rear axle. Maximum body and/or roof width cannot exceed stock dimensions. Duplications of production bodies of fiberglass or carbon fiber permitted. Body may be lengthened or shortened. Front and rear contour of body must resemble same configuration and design for specific body used; holes for air passage prohibited.
Maximum body width variation from front to rear is 6 inches (152 mm). Minimum body width is 60 inches (152.4 cm) when mounted. Bodies are measured at centerline of front and rear axles. Enclosing the wheel wells or the use of wheel fairings is prohibited. Fender flares or lips (maximum 1 inch [25.4 mm]) not on original factory-produced bodies will not be considered in any width measurement.
Wheelwell openings: front, minimum 5 inches (127 mm)
measured vertically from centerline of the front axle to wheelwell opening; rear, minimum 8 inches (203 mm) measured vertically from centerline of rear axle to wheelwell opening. Trailing edge of rocker minimum of 18 inches (45.7 cm) measured directly from centerline of rear axle. Front overhang not to exceed 40 inches (101.6 cm) from centerline of front axle. Beltline moldings (if on stock vehicle), headlight and tail light housings or indentations must be incorporated into body. Tail light area may be hinged (top only) for air venting, maximum 100 square inches (645 cm2) per side; any other holes in rear of body prohibited. Hood scoops prohibited; injector must protrude through hood. Maximum dimensions of hood cowling, 26 inches wide (660 mm) by 5 inches (127 mm) high. Opening for blower hat must have a minimum 2.500-inch (63.50 mm) clearance between body and throttle linkage.
Rocker panel extensions may not be more than 1 inch (25.4 mm) wide. Ground effects of any description prohibited. Ground effects include, but are not limited to, rocker skirts, belly pans, sheetmetal work under the body that produces a «tunnel» for the passage of air, etc. Final determination on all body modifications rests with FIA Technical Services Department.
Bodies must be removable from a rear-release mechanism that must be accessible in the taillight panel area. The rear-release mechanism must be the pin and cable type. The mechanism must be unobstructed and easily visible and not located within 3 inches (76 mm) of any other opening. Release handle must be T-handle design with minimum measurement of 3 inches (76 mm) in length. Contact FIA Technical Services Department for acceptable design, operation, and installation.
Body (hood) burst panel, minimum 288 square inches (1858 cm2), mandatory on all screw-supercharger-equipped cars. Body burst panel must be secured with plastic screws and two 1/8-inch (3.2mm) stainless steel wires, with body pad bolted with plate on both sides of panel.
Any new body designs or concepts must receive approval from FIA prior to competition. Plans, drawings, pictures, etc., must be submitted to the FIA Technical Department for approval. Body specifications may vary for certain exhibition vehicles; prior FIA approval necessary. Underside of body, including roof area and all composite components such as timer boxes etc, must be covered with an FIA-accepted SFI Spec. 54.1 flame retardant covering or coating. Must be applied according to the manufacturer’s specifications and recommendations.
All bolts and fasteners on body, windows, etc. must have button heads toward outside of body. All stiffeners must be placed on the inside of the body, whether on windows, spoiler, etc.
Mounting trees for body may not be adjustable. The framing must be a permanent fixture, with no adjustments.
GRILLE
Must be equipped with a simulated grille of same configuration and design for specific body used, holes for air passage prohibited.
7.7 REAR BUMPER
Must be equipped with rear bumper consisting of a minimum vertical surface of 3-inches (7.65 cm); maximum allowable cutout for parachute shroud lines 4-inches (10.2 cm) by 30-inches (76.2 cm). The trailing edge of rear bumper may not extend more than 54-inches (137.2 cm) from the centerline of the rear axle. Maximum measurement from trailing edge of the rear bumper to ground, 29-inches (73.6 cm) at rear tire pressure of 4.5 PSI (.64 bar). Maximum 1-inch (2.54 cm) lip permitted on rear bumper as a stiffener, not included in overall measurement.
7.8 SPOILERS
Permitted front and rear. Rear spoiler cannot be “built-in” to body. Rear deck relocation cannot extend more than one-third of the as-produced replica body’s rear window. Side surfaces of elevated decks must be completely covered by spoiler spill plates.
Maximum rear spoiler width, including spill plates and attachment points, 54-inches (137.2 cm). Rear spoiler spill plates cannot be located forward of the centerline of the rear axle and onto rear quarter. Spill plates cannot be more than 5-inches (12.7 cm) above the roof line. Rear-most point of spill plate may not exceed 60-inches (152.4 cm) past the centerline of the rear axle. Spill plate supports permitted on one side of spill plate only, not both. Lip on rear edge of spill plate (vertical) .5-inch (1.27 cm) maximum.
The trailing edge of rear spoiler may not extend more than 56-inches (142.2 cm) past the centerline of the rear axle, may not be over 3-inches (7.65 cm) above the roof line, and the forward and trailing edge may not be mounted so as to preclude a “wing” configuration. Wicker on spoiler not to exceed 2-inches (5.1 cm) forward or back. The installation of vortex generators is permitted on the spoiler assembly only; prohibited on car body. Any adjustment or movement during run prohibited. Air flow through spoiler or past the underside of spoiler, other than hinged tail light area, prohibited.
7.9 WINDOWS
Windshield mandatory. Side windows optional. If windows are used they must be clear. Side windows must have a minimum 6-inch (15.2 cm) diameter opening adjacent to driver. See General Regulations 7.8.
GROUND CLEARANCE
Minimum 3-inches (7.6 cmm) from front of car to 12-inches (30.5 cm) behind centerline of front axle, 2-inches (5.1 cm) for remainder of car, except oil pan and exhaust headers.
INJECTOR SCOOP
Injector scoop may not extend more than 18 inches (45.7 cm) forward of the center of the forward engine cylinder, may not extend more than 12 inches (30.5 cm) behind the center of the rear engine cylinder, may not be higher than the top of the windshield, may not have more than 1 square foot (929 cm2) of opening area, and may not be more than 24-inches (61.0 cm) wide.