Top Doorslammers are the ultimate drag racing sedans, using replicas of production sedans and coupes with full racing chassis and large capacity V8 engines, methanol fuel and supercharging.
The Top Doorslammer T/D Class started in Australia in 1995 as an Exhibition Class, from AA/Altered Production vehicles. John Zappia - a pioneer of the class, was the 1995 Top Doorslammer Champion and using a 554 cubic inch TFX engine, producing 2,380 horsepower, achieved a best performance of 6.54 at 218mph.
At events where a Top Doorslammer bracket is not posted, these vehicles will be eligible for Competition Eliminator, using their respective ANDRA National Class Index.
The equivalent Class in the USA is Pro Modified and Top Sportsman in the IHRA (International Hot Rod Association), where blown V8 sedans compete with up to 711ci Nitrous and Injected sedans. The larger NHRA (National Hot Rod Association) does not have a Top Doorslammer class, but is currently running IHRA invitation Exhibition brackets at their events, which are proving very popular.
ANDRA Drag Racing for beginners ANDRA National Records ANDRA Australian T/D Class Rules: Group One - Heads Up Racing
Class Details/Weightbreaks
In order to maintain parity among the different body and engine types, ANDRA has developed a range of weight and supercharger limits. These can be subject to amendment with 28 days notice to current competitors, if deemed necessary by ANDRA, to maintain performance parity between vehicle types. New car designs must be submitted to ANDRA for design approval prior to body construction, with suitable photos of body for approval before painting.
Vehicles using Screw Type superchargers, 5.25 lbs per cubic inch minimum V8 engines only. Minimum weight, 2700lbs (1224.7kg), including driver.
Vehicles using Rootes Type superchargers, 4.96 lbs per cubic inch minimum V8 engines only. Minimum weight, 2550lbs (1156.6kg), including driver.
Vehicles using Nitrous Oxide injection only, minimum weight 2400 lbs (1088.6kg) including driver, with no weight break.
Vehicles using 1963 Corvette bodies must weigh 5.45 lbs/cub and minimum weight of 2650 lbs (screw superchargers), 5.16 lbs/cub and a minimum weight of 2800 lbs (Rootes superchargers), or a minimum weight of 2500 lbs (1136kg) where nitrous oxide injection is used.
NOTE: Only one type of supercharging permitted.
Class Regulations
Engine:
Electronic Management: Except where class regulations permit, computer processor controls operating any aspect of fuel delivery to the engine in response to temperature, pressure or speed sensors are prohibited in Groups One and Two. Unless specifically permitted by the General Racing Regulations, no vehicle may be equiped with any computer or electronic device which can, in any way, directly influence the operation of the vehicle. No vehicle may use any other devices directly activated by light sources or radio transmissions from outside the vehicle. Data logging equipment is permitted in all categories provided it does not operate any function of the vehicle. Any device installed for the express purpose of creating a delay between release of brake, clutch, transmission brake or line lock button and movement of the vehicle from the staging beam, is prohibited in Groups One and Two.
Engine: Must be a V8 automobile engine, year, make and model optional. Any modification allowed. No more than one engine permitted. Any engine setback allowed. Rear engine location is not permitted. General Engine Rules
Exhaust System: All vehicles regardless of type must be equipped with exhaust collectors or stacks installed in such a manner as to direct the exhaust gases out of the body, to the rear of the vehicle, away from the driver/rider and fuel tank. Exhaust gases must not be directed towards the track surface.
Fuel: Restricted to alcohol or petrol only.
Induction: Mechanical fuel injection only permitted. Nitrous oxide may be used with carburettors in the absence of a mechanical supercharger.
Liquid Overflow: Required.
Lower Engine Containment Device: Required.
Superchargers: Permitted, except where vehicle uses nitrous oxide.
Supercharger Overdrives: Rootes type, 20 inch (508mm) rotor length and 11.25 inch (286mm) case width maximum, limited to 70%. Screw type with rotor diameter 8.5 inches (216mm) or less manufactured prior to 1/8/97 - 108% maximum. Screw type with rotor diameter greater than 8.5 inches (216mm) manufactured prior to 1/8/97 - 47% maximum.
Body and Chassis
Airfoils / Wings: Single, fixed airfoils are permitted. The airfoil must be securely mounted, and may be no wider than the widest part of the vehicle body. No part of the airfoil may be higher than the highest point of the roof or extended more than six inches behind the rearmost part of the body, not including bumpers or parachute packs. Maximum surface area of 850 square inches (5484 sq cm). One spill plate permitted on each side to a maximum area of 120 square inches (774 sq cm). Vehicles originally fitted with airfoils will be permitted use original location subject to approval by ANDRA.
Ballast: Permitted.
Batteries: All wet cell batteries must be isolated from driver compartment and must be securely mounted.
Body: May use any coupe or sedan body originally mass produced by an automotive manufacturer prior to 1972, or specifically Australian produced full sized coupes or sedans of any year. Panel vans, station wagons, utilities and sports cars may compete in this class providing all requirements are met. No open vehicles. All cars in this class must have at least two fully operative doors that permit and/or entry from either side. All windows must be retained with 50% of stock opening showing. No one piece bodies. No funny car bodies. Rear wheel arches are subject to approval by ANFRA Technical Department. Left or right hand drive permitted, no centre steer. Front spoiler, grille and guard profile must be approved by ANDRA. Light weight after market body components permitted as long as same appearance is retained for body being used. No holes permitted in back of body. Two hinged openings with combined total maximum of 100 square inches accepted. One inch lip allowed on body in frontal area only.New car designs must be submitted to ANDRA for design approval prior to body construction, plus three photos of body for approval prior to painting. No modifications beyond those currently approved will be permitted for body styles already in use. Existing vehicles registered with ANDRA prior to 31/8/96 will be permitted to continue in the class with no further body or chassis modifications until October 2001, after which time all vehicles must comply with current body dimension guidelines.
Bumpers: Optional.
Bonnet: Required on all race cars in this class. Side panels may be omitted. One piece bonnet/gueard assembly permitted.
Fenders: Must have four production type fenders. Fibreglass or composite replicas permitted.
Frame: Vehicles contructed after 1/10/97 must meet SFI 25.1C. All vehicles in the class must comply with SFI 25.1C after 1/10/2002.
Instruments: Optional.
Overhang: All overhang dimensions are subject to ANDRA approval.
Radiator and Grille: Radiator optional. Grilles are required, and may be painted on. Any deviation from original contours or mouldings must be approved by ANDRA.
Seats:
Spoilers: Permitted, must be approved by ANDRA.
Street Equipment: Headlights must be original size in original location but may be painted on.
Upholstery: Optional.
Wheelbase: 100 inches (2540mm) minimum, 115 inch (2921mm) maximum, or standard wheelbase for body used where longer.
Windshield and Windows: Must be in good condition and may be fully operative. All non operative windows must be permanently closed. Plexiglass of a minimum of 1/8 inch (3.2mm) thickness may be used in any window to replace original glass. Other than factory tint, front windscreens must be clear on all vehicles. Any deviation from original contours must be approved by ANDRA. Any deviation from original contours must be approved by ANDRA. Rear window must be fitted.
Drive Train
Auto Trans/Converters:
Clutch: Mulit stage/lock up clutches prohibited. Clutch must be manually operated by the driver's foot. Electronics, pneumatics, hydraulics or any other device may in no way affect the clutch system, and the throwout bearing must release all fingers, levers or stages simultaneously. Staged or variable release clutches of any description prohibited.
Drive Line: May be modified or fabricated to fit altered units.
Transmission: Aftermarket or production automobile transmissions of any year, make, model or ratio are permitted in all classes. Operative reverse gear is required. Transmission must remain in conventional location determined by engine used. Aftermarket planetary (Lenco type) to a maximum of four forward gear packs and clutchless manual (Liberty type) transmissions permitted.
Suspension
Brakes: Four wheel hydraulic brakes required as minimum.
Suspension: Each car must have operative suspension front and rear and be equipped with at least one effective shock absorber per wheel.
Driver and Safety
Arm Restraints/Window Nets: Required.
Chutes: Required. Dual parachutes with seperate shroud line attachments mandatory on all vehicles.
Driver Position: May be relocated rearwards from stock position. Seat back may be no closer than 24 inches (619mm) to the rear axle centre line. Centre steering not permitted.
Delay Devices: Not permitted.
Fire Extinguisher System: All supercharged vehicles using an enclosed fibreglass or composite body must be fitted with an on-board fire extinguisher system.
Helmet: Required.
Licence Requirements: GOL (Group One Drag Racing Licence) as minimum.
Neck Collar: Required.
Night Lighting: Required.
Protective Clothing: Required.
Roll Bar/Cage: Required. Must meet SFI 25.1C.
Safety Belts: Required.
Self Starting: Remote starters may be used, but removal of panels for access is prohibited.
Technical Inspection: Required.
Naming Rights Sponsor
2006 - 2007 WSID Season Review
2006-2007 Top Doorslammer Season Review
1st World Record 5 Second Run
