About Top Doorslammer

Spectacular heads up class that currently compete in the Nordic region. The regulations allow multiple engine combinations, supercharged, nitrous injected or turbocharged and attract a vast variety of car types.


Svenska: Medlemsavgiften skall vara oss tillhanda före anmälan till berörda tävlingshelg. Team utanför Sverige betalar på plats.
English: The membership fee shall be transfered to our bank account prior to signing up to an event. Non-Swedish teams pay at the track.

Membership fee/Medlemsavgift: 1000 SEK
Bank account: 8327-9 693 744 122-5 (Swedbank)

For more information about membership, contact Andreas Sjödin.

Rules for Top Doorslammer Scandinavia 2017

Text in green are the latest rule revisions.

The class runs on 1/8 mile

CLASS BREAK-OUT: 3.66 sec.

CHASSIS: SFI 25:1E certification required.

SUSPENSION: Race car type suspension required. Solid suspension prohibited.

WHEEL BASE: Minimum 100″, Maximum 115″. S-10, Ranger, Dakota Maximum 125″, and full size trucks maximum 140” Maximum variation is 2” side to side.

GROUND CLEARANCE: Minimum of 3” required from whatever portion of the vehicles body or chassis that breaks staging beam to 12” behind front axle centerline. Minimum of 2” for remainder of vehicle.

DSC02701 BODY: Funny car or one piece bodies not allowed even if equipped with doors. Maximum front end overhang of 45” as measured from centerline of front spindle. An extension may be used to reach 45.

DOORS: Required. Doors must be functional and able to be opened from both the inside and outside of the vehicle.

DRIVER LOCATION: Must be in stock location.

WEIGHT: Minimum weight at conclusion of run, including driver:
– Nitrous: 1050kg
– Roots blower/turbo/procharger: 1090kg
– Screw blower: 1120kg

ENGINE: No maximum cubic inch limit.

SUPERCHARGER: Use of any size centrifugal, roots-type or screw-type supercharger allowed.

Screw blower, see below:

Engine size PSI Whipple
To 500 cid 2.25 1.70
500 – 450 cid 2.15 1.62
450 cid 2.04 1.54

Roots blower
No overdrive class limit. Overdrive can never exceed manufacturer limit.


NITROUS OXIDE: Allowed, but not together with any other power adder!!

TRANSMISSION: Any type allowed, if use of automatic transmission it need to be fitted with efficient oil collecting device.

dsc_0024CLUTCH/FLYWHEEL: Flywheel and clutch meeting SFI 1.3, 1.4, or 1.5 certification required.

REAR END: Automotive type, Full-floater rear end required on cars that runs faster than 3.90 sec @ 1/8” or reaches a final speed of 210 mph (338km/h).

WHEELS: Wheels meeting SFI spec 15.1 mandatory. Maximum width 16”. Use of a liner mandatory on all non bead lock wheels.

STARTER: Optional. No push starts allowed.

FUEL: Unleaded gasoline or methanol, use of nitromethane is prohibited.

LICENSE: Valid FIA International License or C1 (Pro Mod) license mandatory.

START NUMBER: Required on windshield, rear window and both sides of the vehicle.

DECALS: Top Doorslammer logo required on both sides of the vehicle. Additional sticker to show vehicles kind of power adder also required. TD and power adder decals handed by the Top Doorslammer association.

OTHER: Follows most FIA Rules for Advanced ET but SBF rules first.

For more detailed information take a look in the EDRS Guidelines.

Sjödin Motorsport Race Cars
Bil & glasdesign