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Last
Updated: NOV. 8, 2019
$5,000 WINNER
$1000 R-UP
$300 SEMIS
$200 1/4s
DESIGNATION: The class designation is LDR. All entrants
must display this designation on both sides of their car
with car number.
FORMAT: This is a 1/8th mile, heads up category running on
a .400 Pro tree with a 32-car qualified field,
professional pairing ladder. This is a single power adder
class only!
SAFETY: All NHRA/IHRA and Local Track Safety rules apply
for car and driver, including the use of an oil retention
device and/or engine diaper is MANDATORY. Any competitor
causing an oil down that does not have an oil retention
device will lose 5 points off their 2018 LDR championship
points tally.
BODY: The car must retain its original appearance,
profiles and dimensions. No aftermarket one-piece bodies.
OEM door jamb and quarter panels must be used. No modified
front ends to achieve maximum NHRA/IHRA overhang, must
stay within original body dimensions. Must retain factory
body lines with removable composite components as in hood,
front bumper, front fenders, doors and deck lid. Any beam
tripping devices forward of the bumper are prohibited.
Aftermarket front bumpers (“Ex. Snowplows or Valances”)
cannot have more than 2 inches of overhang over the stock
bumper dimensions, failure to abide by this rule will
result in disqualification. Aftermarket wings and spoilers
are permitted. A hood must be used; scoop or hood must
cover entire induction system. Exceptions are throttle
bodies or carburetors on naturally aspirated and nitrous
oxide assisted engines along with intake
manifolds/throttle bodies on boosted engines. Those may
protrude through the hood for clearance, if needed.
Forward facing hood scoops/turbocharger/supercharger
inlets are permitted. OEM/Lexan windows are permitted.
Front ends must be within the spirit of the rules and
legality is at the discretion of the race director.
Firewall must be in the stock location; stock firewall can
be modified.
CHASSIS: Door cars only, no pro mod or full tube chassis.
Backhalf style cars are permitted. No Wheelie Bars. Any
rear suspension is permitted. Factory front frame rails
are mandatory, they can be modified and must extend to the
center of the front spindle. Aftermarket front K-Members
are permitted, must bolt in the factory location. Factory
equipped 'bolt-in' subframe cars are permitted an
aftermarket bolt-on front end (Ex., Smith Racecraft) for
'62-'74 Nova and '67-'81 Camaro/Firebird, must bolt in.
Factory wheelbase for year/make/model must be maintained,
(+/- 1 inch). A minimum height of 3 inches from the front
of the vehicle to 12 inches behind front spindle center
line is mandatory. A minimum height of 2 inches for the
rest of the vehicle is mandatory (except for oil pan and
headers).
BALLAST: Any material used for the purpose of adding to a
car’s total weight must be permanently attached to the
car’s structure and must not extend in front of or behind
the rear of the car’s body. No liquid or loose ballast
permitted (water, sandbags, rock, shot bags, metal
weights, etc.). Removable weight must be securely mounted
to the frame or frame structure by a minimum of two
1/2-inch diameter steel bolts per 100 pounds, or one
3/8-inch steel bolt per 5 pounds. All other weight bars,
pucks, etc., must use a minimum two 1/2-inch diameter SAE
Grade 8 bolts for attachment per 100 pounds.
ENGINE/POWER ADDERS: The cubic inch limit for any
naturally aspirated or power adder combination is 965
cubic inches. All SMALL BLOCK combinations must retain
stock bore spacing (4.400) and a maximum 10.000-inch deck
height. All engines must have a diaper, belly pan or oil
retention device. Nitrous oxide is permitted to run any
type multi-stage nitrous system with no restrictions.
Nitrous entries must have bottle securely contained in a
bottle bracket. Maximum bore spacing for all boosted
combinations is 5.000 or less. Turbocharger combinations
are limited to a maximum 118mm single turbo or a set of
88mm twin turbochargers. Refer to weight
addition/reduction section below for twin turbocharger
clarification.
The maximum specifications for a single turbocharged
combination are COMPRESSOR WHEEL (inducer-118mm tip to
tip, exducer-141mm maximum) and TURBINE/EXHAUST WHEEL
(inducer-130mm maximum, exducer-114mm maximum). The
maximum specifications for a twin turbocharged combination
are COMPRESSOR WHEEL (inducer-88.9mm maximum, exducer
dimensions-134mm maximum, measured at the backing plate),
(non-extended exducer tip-to-tip measurements may not
exceed 135mm), (extended exducer tip-to-tip measurements
may not exceed 142.5mm) and TURBINE/EXHAUST WHEEL
(inducer-113mm maximum, exducer-103.5mm maximum). The
maximum diameter of the housing bore at the leading edge
of the wheel may not exceed 2mm more than the maximum
allowable turbocharger size permitted. Compressor map
groove will not exceed .250 of an inch. Turbochargers will
be verified by measuring the housing bore at the leading
edge of the impeller wheel and must retain the contour of
the compressor housing, stepped or clipped compressor
wheels are prohibited. Inserts or reducers to achieve
inlet or outlet dimensions are prohibited. Any
inconsistent modifications to compressor or turbine wheel,
blades, hubs, cover or housing beyond accepted
commercially available manufacturing process is
PROHIBITED. Supercharger combinations are limited to a
single centrifugal supercharger at a F3-139 maximum, small
block and big block. Maximum size on all twin centrifugal
supercharged combinations is base F1X, (F1X-12 is
prohibited). Roots superchargers are restricted to a 14-71
maximum. Screw superchargers are permitted on a small
block combination only and must be run on a 275 drag
radial, no big tire option. Screw superchargers are
prohibited on big blocks, 481X and HEMIs. Dual power
adders are strictly prohibited across all combinations.
All forms of power adders (nitrous, turbochargers and
superchargers) must be commercially available to the
general public for purchase and use. ELECTRICAL: All
entries must be self-starting from inside the vehicle. A
master cut-off switch is mandatory on the rear of the car
with an on/off sticker. Any electronic ignition system is
allowed, see below for weight additions/reductions.
Computer/Data Recorders are permitted. EXHAUST: Mufflers
or inserts are required on all cars except for turbo cars.
Exhaust may exit underneath car or out the front
fenders/valance but must not affect timing or staging
beams. CO2 SYSTEM AND LINE: The first TWO feet (minimum)
of the line coming from the CO2 bottle must be 1/4"
plastic line with push-locks. No braided steel lines
direct from the CO2 bottle to ensure no nitrous oxide is
being used. Braided steel line may be used after the first
two feet of plastic/push-lock line to protect the line
running through the firewall and/or around exhaust system.
INTERCOOLER: Any intercooler is permitted on gasoline
combinations only. Must be securely mounted to chassis or
mounts with preferred hardware. Water box must be
contained in a safe environment with a top to enclose
water/ice during the run. Intercooler combined with a
methanol fueled combination is prohibited.
TRANSMISSION/DRIVELINE: Any transmission permitted. Any
converter permitted. Lock-Up Transmission/Converter setups
are permitted on naturally aspirated and nitrous oxide
combinations only, prohibited on turbocharger or
supercharger combinations. FUEL: Any gasoline, E85 or M1
permitted. M5 is prohibited. No nitromethane or additives.
WHEELS/TIRES: Any brand 275/60/15 Drag Radial. Mickey
Thompson 295/65/15 Drag Radial (PN: 3558) and Hoosier
295/65/15 DR2 (PN: 17316DR2) will be the legal tire
options for the 'big' tire option. Nitrous oxide
combinations can run any tire at base weight, no weight
penalty on nitrous cars for the big tire. Any 481X/HEMI or
Any Hemispherical Headed Combination equipped with single
turbocharger, twin turbochargers or centrifugal
supercharger(s) must be on a 275/60/15 drag radial, no big
tire option for that engine/power adder combination. Must
stay on the same tire throughout the entire event.
WEIGHTS: All weights are minimum with driver in car.
NATURALLY ASPIRATED: - Small Block - No Minimum - Big
Block - No Minimum NITROUS OXIDE: - Small Block - 2,200
lbs. - Big Block (4.840 Bore, Any Transmission) - 2,550
lbs. - Big Block (5.000 Bore, Any Transmission) - 2,650
lbs. - Big Block (5.000+ Bore, Up to 903 CI, No Lockup
Transmission) - 2,800 lbs. - Big Block (5.000+ Bore, From
904-965 CI, No Lockup Transmission) – 2,825 lbs. (+25) -
Big Block (5.000+ Bore, Up to 903 CI with Lockup
Transmission) – 2,850 lbs. - Big Block (5.000+ Bore, From
904-965 CI with Lockup Transmission) – 2,875 lbs. (+25)
TURBOCHARGER: - Small Block, Single Turbo - 2,800 lbs.
(-50) - Small Block, Twin Turbo - 2,950 lbs. (-50) - Big
Block, Single Turbo - 3,075 lbs. (-25) - Big Block, Twin
Turbo – 3,325 lbs. (No Weight Addition for the 295/65/15
Tire) SUPERCHARGER: - Small Block, Roots - 2,650 lbs. -
Big Block, Roots – 2,800 lbs. - Small Block, Screw – 3,000
lbs. - Small Block, Single Centrifugal (ProCharger F1 or
Equivalent) - 2,725 lbs. (-50) - Small Block, Single
Centrifugal (ProCharger F2 or Equivalent) - 2,750 lbs.
(-50) - Small Block, Single Centrifugal (ProCharger F3 or
Equivalent) - 2,775 lbs. (-50) - Small Block, Twin
Centrifugal - 2,950 lbs. (-50) - Big Block, Single
Centrifugal (ProCharger F1 or Equivalent) - 2,975 lbs.
(-50) - Big Block, Single Centrifugal (ProCharger F2 or
Equivalent) - 3,025 lbs. (-50) - Big Block, Single
Centrifugal (ProCharger F3 or Equivalent) - 3,075 lbs.
(-50) - Big Block, Twin Centrifugal - 3,200 lbs. (-50)
WEIGHT ADDITIONS/REDUCTIONS: - 100 lb. Weight Addition for
the 295/65/15 ‘Big’ Tire Option, (MT 3558 or Hoosier
17316DR2) except Big Block Twin Turbo combination. - 100
lb. Weight Addition for 481X/HEMI or Hemispherical Headed
BBC/BBF except Twin Turbo platform. - 481X, HEMI and Any
Hemispherical Headed Engine must be on 275 Drag Radials if
power adder is single turbocharger, twin turbocharger or
any centrifugal supercharger(s) combination. This rule
applies for the screw supercharger, small block
combination as well. - 25 lb. Weight Reduction for
Non-Extended Tip Compressor Wheel turbochargers on Twin
Turbocharged Combination Only (Competitors may be asked to
remove compressor cover for verification at any time by
technical inspection team) - 25 lb. Weight Reduction for
Conventional Headed BBC Combinations on Gasoline. - 50 lb.
Weight Reduction for Centrifugal Supercharger Combination
on Gasoline. - 50 lb. Weight Reduction for Leaf Spring
Rear Suspension. |
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