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Extreme 10.5 Class
- No minimum weight or maximum cubic inch limit.
- BELLY PAN: Allowed. Pan must extend beyond
the leading edge of the engine and any accessories.
The front edge of the pan must have a 1 inch
lip.
- 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. All bodies must originate
from a production vehicle.
- DOORS: Required. Doors must be functional
and able to be opened from both the inside and
outside of the vehicle. Doors may be fabricated
from carbon fiber, fiberglass or metal. A metal
deflector between the fenders and the leading
edge of the doors is required.
- FIREWALL: Magnesium not allowed. All firewalls
must be made of steel or titanium (.024 minimum
thickness)
- FLOORS: Replacing stock floors with .024"
steel or .032" aluminum allowed. Driver's
side floor pan must be .024" steel and
must be welded in place extending from firewall
to back of driver's seat. Carbon fiber or composite
materials may not be utilized in any portion
of the flooring in the driver's compartment
except for any panel located behind the driver
including suspension covers and wheel tubs.
- HOOD SCOOP: Allowed. One opening only.
- HEADLIGHTS AND TAIL LIGHTS: Functional headlights
(minimum of 3” in diameter) and tail lights
are required and must be in stock location.
Brake lights must also be functional.
- WINDOWS AND WINDSHIELD: Required. May be
replaced 1/8 inch think lexan, plexiglass or
other shatterproof material.
- BATTERY: Required. All vehicles must be self
starting. Maximum of two batteries allowed.
All batteries must be securely fastened. An
external master electrical shut off clearly
labeled “PUSH OFF” is required.
- BRAKES: Four wheel brakes with dual master
cylinder mounted above frame rails required.
- CHASSIS: SFI 25.1 E or 25.2 certification
required.
- DRIVER LOCATION: Must be in stock location,
on left side of vehicle.
- 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.
- STEERING: SFI 42.1 steering wheel disconnect
required
- SUSPENSION: Race car type suspension required.
Solid suspension prohibited. Shock absorbers
required for all four wheels.
- TIRES:. Maximum tire width, regardless of
temperature or wear, not to exceed 11.5”.
Maximum roll out of 105”, regardless of
temperature or wear, as measured with vehicle
off of the ground at 8 lbs of air pressure.
Manufacturer, model and size information must
be clearly designated.
- WHEEL BASE: Minimum 90", Maximum 115”.
Maximum variation is 2”.
- WHEELIE BARS: Required. Non metallic wheels
required.
- WHEELS: Wheels meeting SFI spec 15.1 mandatory.
Maximum width 16”. Use of a liner mandatory
on all non bead lock wheels.
- EXHAUST: Automotive type system designed specifically
for racing with functional mufflers required.
Must utilize a traditional 4 into 1 collector
design. Zoomies prohibited. Cone inserts are
not allowed. Exhaust gasses must be directed
out of the body towards the rear of vehicle
and away from the driver and fuel system.
- FLYWHEEL SHIELD: SFI 6.3 certification required.
- FUEL: Alcohol, gasoline and methanol allowed.
The use of nitromethane is strictly prohibited.
- INTAKE MANIFOLD: Burst panel is required
on all vehicles. SFI 23.1 certification required
on all supercharged entries.
- NITROUS OXIDE: Allowed.
- REAR END: Automotive type required. Titanium
wheel studs prohibited.
- STARTER: Required. All vehicles must be self
starting.
- SUPERCHARGER: Use of any size centrifugal,
roots-type or screw-type supercharger allowed.
- TRANSMISSION: Any type allowed.
- TURBOCHARGER: Allowed.
- COMPUTER: Allowed.
- DATA / ELECTRONICS ACQUISITION: Allowed.
- STARTING LINE ENGINE CONTROL DEVICES: Allowed.
- DRIVER RESTRAINT SYSTEM: SFI 16.1 certification
required. With “7 point system&rdquo
recommended.
- ENGINE CONTAINMENT SYSTEM: lower engine containment
system required. The system must include the
oil pump and related components and be a minimum
of 3” above ground.
- FIRE SYSTEM: SFI 17.1 system required. One
nozzle required inside driver’s compartment
must be directed at driver’s feet. Two
or more nozzles must be directed at front of
engine and fuel cell.
- HEAD AND NECK RESTRAINT: SFI 38.1 required.
An aluminum skid plate located above driver’s
head is recommended.
- HELMET: SN-2000 or newer of SFI 31.2 or 41.2
required.
- MASTER ELECTRICAL CUTOFF: Required. Must
be clearly labeled “PUSH OFF”.
- PROTECTIVE CLOTHING: A driver's suit meeting
SFI 3.2A/15, gloves meeting SFI 3.3/15, shoes
meeting SFI 3.3/15 and a head sock meeting SFI
3.3 required on all nitrous assisted vehicles.
- ROLL BAR PADDING: SFI 45.1 required.
- SUPERCHARGER RESTRAINT: SFI 14.2 minimum required
on all roots-type superchargers. SFI 14.21 required
on all screw-type superchargers. You must utilize
the entire assembly including bag, plate and
straps.
- TRANSMISSION: All transmissions must be covered
by a one piece SFI 4.1 restraint.
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