PRO EXTREME Class Rules
Decals Required on both sides of the
vehicle, front fender or hood.
PDRA Logo required on both sides of
Alternates receive ONLY 25 entry
Pro Extreme or PX followed by car number. Numbers must be at
least 4” tall and on both side windows, upper left of rear
window and upper right of windshield.
FIELD: 16 car qualified field.
Minimum weight at conclusion of run, including driver 2,350
225 lbs weight break for entries utilizing a small block
All rules subject to change at the sole discretion of the PDRA
Technical Services Department.
REQUIREMENTS AND SPECIFICATIONS
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 spindles. An PDRA accepted
extension may be used to reach 45” if the front end overhang
of the body is less than 45”. All bodies must originate from a
production vehicle. All new cars must be accepted by the PDRA
competition department prior to construction. All vehicles
must be professionally finished, painted, lettered, numbered
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, aluminum or composite not allowed. All
firewalls must be made of steel or titanium (.024″ minimum
FRAME: Chassis must meet SFI Spec
25.1. Chassis must be recertified
yearly by the PDRA and have
specialized sticker affixed to roll
cage before participation. See General
Regulations 4:4, 4:11, 10:6. A panel
of .032-inch aluminum, .024-inch
steel, or carbon fiber must be
installed on the inside portion of the
roll cage anywhere the driver's legs
can come into contact with the cage.
Panels must be installed in the front
and lower portion of the drivers-side
X brace. Panels must attach to the
interior side of the tubing, or no
further than the middle of the tubing,
with "impact-type" padding attached to
the panels. Padding must extend to be
flush with X brace. Minimum padding
thickness is 1/4 inch. An additional panel(s) of .032-inch aluminum,
.024-inch steel or carbon fiber must
be installed in the roll cage roof
area. The panel(s) must, at minimum,
extend from the drivers side roof bar
to the centerline of the vehicle. The
panel(s) in the Funny Car cage area
must be removable for proper chassis
certification inspection. Racecars
built before 2015 has a 12 month grace
period. All racecars must meet
requirements listed above by 2016.
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 aluminum may be
utilized in the passengers portion of the flooring in the
HOOD SCOOP: Allowed. One opening only. Must be finished and
painted to follow the bodies paint scheme.
TAIL LIGHT: Functional rear tail light is required. Tail light
must be permanently mounted and controlled from the driver’s
WINDOWS AND WINDSHIELD: Required. May be replaced 1/8” think
lexan, plexiglass or other shatterproof material. An opening
with a 4″ diameter minimum is required on side windows
adjacent to the driver.
BATTERY: 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
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
STEERING: SFI 42.1 steering wheel disconnect required.
SUSPENSION: Race car type suspension required. Solid
suspension prohibited. Shock absorbers required for all four
TIRES: Automotive type tires designed specifically for
racing required. Tires cannot be located outside of bodyline.
Manufacturer, model and size information must be clearly
WHEEL BASE: Minimum 100”, Maximum 115”. S-10, Ranger, Dakota
Maximum 125”. Maximum variation is 2” side to side.
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.
DRIVELINE AND ENGINE
CLUTCH AND FLYWHEEL: Clutch and flywheel meeting SFI 1.3, 1.4,
or 1.5 certification required. SFI 29.1 flexplate required on
all torque converter equipped cars
(SFI 29.2 recommended).
CYLINDER BORE SPACING: Bore Spacing is set at a maximum of
DRIVELINE: A full 360 degree driveshaft tube is required over
yoke, extended a minimum of 12” from transmission tail shaft.
Minimum thickness of tube housing is .050” chromemoly or
titanium. Two piece units accepted with a minimum of 6 3/8”
grade 8 bolts. SFI 43.1 driveshaft required.
ENGINE CONTAINMENT SYSTEM: SFI 7.1 lower engine containment
system required. If a flexible 7.1 system is utilized, it must
be accompanied by a carbon fiber or aluminum belly pan with a
minimum 2” vertical lip.
ENGINE SETBACK: Maximum of 10% of total vehicle wheel base as
measured from the centerline of the forward front spindle to
center of front spark plug hole.
EXHAUST: Automotive type system designed specifically for
racing required. Exhaust gasses must be directed out of the
body towards the rear of vehicle and away from the driver and
All removable multi-piece exhaust
collectors/stacks must be securely
fastened with either an NHRA-accepted
header tether, a minimum ½”
(half-inch) stitch weld located on
each primary tube or be permanently
attached to the vehicle body or frame
with positive fasteners (i.e. exhaust
hangers, support brackets, bolts/nuts,
etc.) such that they require tools for
HARMONIC BALANCER: SFI 18.1 certification required.
FLYWHEEL SHIELD: SFI 6.3 certification required.
FUEL: Alcohol, gasoline and methanol allowed. The use of
nitromethane is prohibited.
IGNITION: Maximum of one (1) spark plug per cylinder on
all supercharged or turbocharged vehicles.
INTAKE MANIFOLD: Burst panel meeting SFI 23.1 certification
REAR END: Automotive type, Full-floater rear end required.
Titanium Wheel studs prohibited.
STARTER: Optional. No push starts allowed.
SUPERCHARGER AND OVERDRIVE: Use of any size centrifugal,
roots-type or screw-type supercharger allowed. Maximum
overdrive for a roots-type supercharger is 1.70 (70 percent
over). Maximum overdrive for a PSI screw-type supercharger is
2.28 (128 percent over). Maximum overdrive for a Whipple
screw-type supercharger is 1.60 (60 percent over). All
screw-type superchargers must be certified to SFI Spec 34.1
and overdrive limit established to be eligible for PDRA
competition. Any new screw-type supercharger must be accepted
for competition prior to competing at an PDRA event. All
screw-type superchargers must display a current SFI
POWER ADDER: More Than One Power Adder
is allowed. (Nitrous Oxide Allowed)
TURBOCHARGER: Allowed. No turbo to
exceed more than 102 mm. Must be SFI
TRANSMISSION: Any type allowed.
CREDENTIALS: A valid competition license is required. Valid
NHRA or IHRA competition license will be accepted or may be
transferred when presented with a current physical.
When an event is contest at an NHRA
Member track only PDRA or NHRA
competition licenses will be accepted.
DATA AND ELECTRONICS
STARTING LINE ENGINE CONTROL DEVICES: Allowed.
TOW VEHICLES: Allowed. A valid driver’s license is required to
operate any type of tow vehicle. All passengers must be seated
inside of vehicle with all doors closed. Riding in open
hatchback, trunk or cargo area not allowed. ATV’s are allowed
with a maximum of one passenger who must be seated at all
times. Golf carts are allowed with a maximum of four
passengers who must be seated at all times. Posted pit speeds
must be obeyed at all times. If pit speed is not posted,
maximum pit speed will be 5 mph.
DRIVER RESTRAINT SYSTEM: SFI 16.1 certification required. 7
point system recommended.
FIRE SYSTEM: SFI 17.1 system required. System must contain a
minimum of 20 lbs of fluid or gas fire suppression agent. 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. All fire suppression must be
released with a single actuation (i.e. single handle, button
HEAD AND NECK RESTRAINT: SFI 38.1 required. An aluminum skid
plate located above driver’s head is recommended.
HELMET: SN-2010 or newer, SFI 31.2 or 41.2 required. Use of
open face helmet prohibited. Eject Helmet Removal System (Part
# SDR 890-01-30) or equivalent required.
MASTER ELECTRICAL CUTOFF: Required. Must be clearly labeled
PARACHUTES: Dual parachutes required. Separate shroud-line
mounting points with 1/2” sleeved grade 8 bolts required.
PROTECTIVE CLOTHING: A driver’s suit meeting SFI 3.2A/20,
gloves meeting SFI 3.3/20, shoes meeting SFI 3.3/20 and a head
sock meeting SFI 3.3 required. A head sock is not required
when a helmet manufactured with a skirt meeting SFI 3.3 is
RF SHUTDOWN RECEIVER: Properly functioning Electrimotion
shutoff device (part numbers SB001 and RF001) recommended.
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.
UPHOLSTERY: Driver’s seat foamed with energy absorbing
material, formed for the driver and covered with flame
retardant material is required. Lateral helmet supports
WINDOW NET: SFI 27.1 required.
BE SURE TO ALSO VIEW OUR "OVERALL / GENERAL SERIES RULES"