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Rule Updates

 2015  IHRA Rulebook Revisions and Clarifications



p. 56 Sportsman Motorcycle: Helmet: Add the following to the section: ECE 22.05 models permitted on bikes running 10.00 or slower in the1/4 or 6.50 and slower 1/8 mile. 


 Add the following the MX classes starting on page 34:

 Class SS/EX: 11.50 or more pounds per cubic inch, naturally aspirated, methanol only, front-wheel-drive only, full-bodied  (Index: 10.95 - 1/4 and 7.05 - 1/8.)  

Class SS/VX: 12.00 or more pounds per cubic inch, naturally aspirated, aircooled, Volkswagen, rear-engine, full-bodied.  (Index: 11.95 - 1/4 and 7.75 - 1/8.)  


VX class: Full-bodied, rear-engine, Volkswagen. Carbon fiber or fiberglass replacement body pieces permitted. Deck lid mandatory.

FLOOR: Mandatory. EX class: Horizontal portion(s) of floor pan may be removed from behind B-post or roll-cage main-hoop attachment points (whichever is farther rearward) to rear of car. Entire shock/strut tower structure must be retained. Portion of floor removed must be replaced with aluminum or steel, completely sealed. Excessive lightening of unibody structure, i.e., drilling of holes, etc., prohibited.

UPHOLSTERY: EX and VX classes: Upholstery, headliners, carpets, dashboard, etc. optional. Must be equipped with one seat minimum for driver, properly installed. Holes, slots, or other openings in floor and/or firewall prohibited.


SUSPENSION, FRONT: EX class: Upper mounting point for strut assemblies must be in the factory location. Front and rear sides of strut tower may be “notched” for tire clearance, and area must be refinished with minimum .024-inch steel. Roll-cage tubing may run across top of strut tower and attach to frame horn. Adjustable caster/camber pillow ball mounts are permitted. Lower control arm may be strengthened provided factory mounting points to chassis are maintained. Aftermarket or fabricated lower control arms permitted; must use original mounting points. Lower mounting point for strut assembly may be modified for improved caster or camber. Strut tower braces, lower tie bars, sway bars, and limit straps permitted. Traction bars/devices permitted; must be bolt-on ONLY. All front suspensions must utilize one, and only one, working shock absorber/strut per wheel. Shock/strut must attach to original OEM upper mount and maintain minimum 1-inch travel. VX class: OEM-type suspension and dimensions for model year claimed mandatory. Coilovers, longer spring plates, etc. prohibited. Raising and narrowing permitted.

SUSPENSION, REAR: EX class: Factory-independent rear suspension may be replaced with straight-axle suspension but must retain original mounting points. Strut must mount to original upper mounting point. VX class: OEM-type suspension and dimensions for model year claimed mandatory. Coilovers, longer spring plates, etc. prohibited. Raising and narrowing permitted.

TIRES : VX class: Street-type or drag slicks, maximum 10-inch tread width.

WHEELIE BARS: EX class: Permitted. Maximum length 65 inches from rear bumper




CAMSHAFT/LIFTERS: VX class: Flat tappet cam with flat tappet lifters mandatory. Maximum lift at the valve 0.630-inch.

CARBURETOR: VX class: Maximum two only, single- or two-barrel downdraft Kadron, Weber, Dellorto, or Empi  carburetors. Maximum 52mm (2.047 inches) throttle bore and 44mm (1.732 inches) venturis.

CYLINDER HEADS: VX class: Stock intake flange Volkswagen-type cylinder heads mandatory. Stud pattern must be in OEM location with OEM dimensions. Studs must be used to mount the manifold to the cylinder head. Welding to increase, or originally filled, manifold flange area permitted. Maximum intake valve head diameter 44.1mm (1.736 inches), maximum exhaust valve head diameter 37.5mm (1.476 inches). Minimum valve stem diameter 5/16-inch. Titanium valves, retainers, and keepers permitted. Steel pushrods mandatory.

ENGINE: EX class: Engine must be from same manufacturer as body. 4- cylinder engine only; all others prohibited. All engine-block and cylinder-head castings must be, or have been, available in a production car or truck from a recognized OEM assembly line with a minimum production run of 5,000 units. Fuel injection permitted. Fuel: methanol only.

VX class: Naturally aspirated, air-cooled, OEM Volkswagen. Maximum engine size 2,444cc (149 cid). Maximum bore diameter 94.1mm (3.705 inches). Cast-iron or steel cylinders and steel connecting rods mandatory. Vacuum pump prohibited. Oil-retention device mandatory; device must extend from midplate rearward past crankshaft pulley and must incorporate a minimum 2-inch-high lip on all sides. Nonflammable, oil-absorbent liner is mandatory inside of device.

ROCKER ARMS: VX class: OEM-style rocker arm mounting and dimensions mandatory. End supports permitted.

 TURBOCHARGERS: Permitted in DX only. Must be no larger than the T04-b or the 300 Series Rotomaster/Garrett, twin 62mm or single 80mm maximum size. Air-to-air or water-to-air intercooler permitted on turbocharged SS/DX vehicles.DRIVETRAIN: 2


WEIGHT: Minimum weight: 1,700 pounds for 6-cylinder cars; 1,200 pounds for 4-cylinder cars; VX class, 1,600 pounds. All weight minimums are with driver. Cars with fully automatic transmission with converter may remove 100 pounds from regular class weight; may be under posted minimum weight. Cars weighed with driver; class minimum includes driver.

CHASSIS, ALL CARS: EX class: Must retain FWD configuration; rear-drive conversions prohibited. Roll cage mandatory for all cars. Roll cage must be recertified every three years and have serialized sticker affixed to roll cage before participation. Excessive lightening of unibody structure (i.e., drilling of holes, etc.) prohibited. Center driver position prohibited. Driver must be located completely to the left or right of vehicle centerline. Engine must be located in OEM orientation for body used. Conversion from transverse to longitudinal engine orientation prohibited. Wheel tubs, back halfs, tube chassis, etc. permitted.

 WHEELBASE: EX class: Must retain original wheelbase for body used, plus or minus 1 inch. Maximum wheelbase variation from left to right is 1 inch.


 FIRE EXTINGUISHER SYSTEM: EX class: Minimum 5-pound, fire extinguishing system mandatory. System must be divided with one nozzle on driver’s side and one nozzle on engine.DRIVER: 10

PROTECTIVE CLOTHING: Jacket and pants meeting SFI Spec 3.2A/5 mandatory in AX, BX, DX, EX, or any vehicle running 9.99 or quicker. Jacket and pants meeting SFI Spec 3.2A/1 mandatory VX. Gloves and boots/shoes meeting SFI Spec 3.3/1 mandatory in EX. SFI Spec 3.3/1 gloves mandatory in any vehicle running 




p. 41 and 42 Stock Fuel Injection: Class designations:  Add the following class: DD and EE to the classes for 2008 and later factory muscle cars.

 Update the class break section to the following:


                                                            Index                1/4       1/8   

Class DD…….9.00 to 9.99                   DD/FI               11.25  -  7.30    

Class EE…….10.00 to 10.99                EE/FI                11.55  -  7.50

                                                DD/FIA             11.30  -  7.35    

                                                          EE/FIA             11.60  -  7.55


p. 38 STOCK: Cylinder Heads: Add the flowing to the section. Cylinder Head Studs permitted.




p. 24 TRANSMISSION: Add the following to the section: Manual Transmissions are limited to 5 forward speeds. 

p. 89 THROTTLES: Replace the second to last sentence in the section with the following:  Throttle cables or linkages are permitted in all applications.


p. 68 FIRE SYSTEM: Replace the first paragraph of the section with the following: Required on all closed body cars 7.49 or quicker ¼ or 4.49 or quicker 1/8 mile.



p. 81 LICENSE:  Replace the first paragraph of the section with the following: Each driver of a vehicle entered in any event conducted at an IHRA sanctioned facility must have a valid State driver’s license beyond a learners permit and a Competition License if mandated by class requirements (except Junior Dragster). This license is subject to inspection at any time. All drivers running 0-9.99 ¼ mile or 0 to 6.39 1/8th mile must obtain an IHRA or accepted competition license.

p. 69 ROLL CAGE / ROLLBAR (0 to 9.99 1/4 or 0 to 6.49 1/8): Replace the section with the following:  Roll cage mandatory on all entries.  On full bodied cars with an unaltered floor and firewall running 6.40 or slower in the 1/8th mile, a roll bar is permitted in place of roll cage.  All entries running 9.00 or quicker 1/4 mile or 6.00 or quicker 1/8 mile must have a current Chassis Certification. See SFI Specifications and General Regulations.

p. 69 ROLL CAGE / ROLLBAR (10.00 to 11.49 1/4 or 6.50 to 7.49 1/8):   Roll cage is mandatory if entry has an altered floor or firewall, or if vehicle exceeds 135 mph. Roll bar mandatory in all cars (including T-tops) running 10.00 to 11.49 ¼ mile or 6.50 to 7.35 1/8 mile, in convertibles running 11.00 to 13.49 ¼ mile or 7.00 to 8.25 1/8 mile and in all dune-buggy-type vehicles running 12.00 seconds and slower ¼ mile or 7.50 1/8 mile .




p. 69 10:00 to 11:49: Helmet: Replace the first sentence with the following:   Replace SN 95 with SN 2000 or newer mandatory.


p. 32 -33 Super Stock: Modified Stock and Modified Compact: Replace Pages 32 and 33 of the printed copy of the rulebook with the following.  The online version is correct.

 page 32

EXHAUST SYSTEM: Open exhaust with headers permitted. Tail pipes and/or mufflers optional. Final outlets for open exhausts cannot exceed 4” in diameter. 

MANIFOLD: Any stock or replacement intake manifold permitted.

GASOLINE: Must run gasoline. See General Regulations.

FLEX-PLATE: SFI 29.1 mandatory.

FLYWHEEL, CLUTCH: Stock-type cast iron flywheels and/or pressure plates prohibited. Units meeting SFI Spec. 1.1 required.

FLYWHEEL SHIELD: Flywheel shield meeting SFI Spec 6.1 required on all cars with clutch.

TRANSMISSION: Aftermarket conventional operated 4-speeds allowed. Clutch-assisted automatic transmissions use stick-shift weight break. Functional neutral safety switch mandatory. Lockup converters prohibited. Reverse gear required. Overdrive units prohibited.

TRANSMISSION SHIELD, AUTOMATIC: Transmission shield meeting SFI Spec 4.1required. See General Regulations.

REAR END: Axle retention devices and aftermarket axles mandatory. Any automotive type permitted. “Floater”, ratchet-type (limited slip), or locked accepted.

DRIVER RESTRAINT SYSTEM: Must meet SFI 16.1 within 2 year expiration from date of manufacture.

HELMET: SN-2005 or newer or SFI 31.1, 31.2, 41.1 or 41.2 mandatory. See General Regulations.

MASTER CUTOFF: Master electrical cutoff switch required. Marked “push-off”

ROLL BAR PADDING: Mandatory. SFI Spec. 45.1.

WINDOW NET: An SFI 27.1 net is mandatory.

DELAY BOX/SWITCH: Electronic, mechanical or any other delay device prohibited.

TAIL LIGHTS: A minimum of one functional tail light mandatory.


Modified Compact

DESIGNATIONS: SS/AC, SS/BC, SS/CC, SS/DC, SS/EC, SS/FC, followed by car number.

Numbers must be at least 4” high on all 4 windows.

Reserved for cars with originally equipped engines, self-starting and suitable for street use. Body, engine, drivetrain, chassis, etc., may not be altered, modified or relocated except as noted in Class Requirements. Push starts and tow cars prohibited. Class determined by total car weight divided by total cubic inches engine displacement.



Class AC .............15.00 to 16.49 Ibs. per cubic inch, includes rotary engines.

Class BC .............16.50 or more pounds per cubic inch

Class CC .............18.50 or more Ibs. per cubic inch, American production, front engine.

Class DC .............15.00 to 17.99 Ibs. per cubic inch, 4-or 6-cyl. front wheel drive only.

Class EC .............18.00 or more Ibs. per cubic inch, 4-cyl. front wheel drive only.

Class FC For 4-cyl. American built cars with a maximum displacement of 165 cu. in. Minimum weight with driver is 2,400 Ibs. for automatic and 2,500 for manual transmissions.

Requirements and Specifications for compact classes are the same as those for Super Stock classes, with the following exceptions.

BODY: Must be factory-produced passenger car. Customizing, chopping, channeling or sectioning prohibited. Body must not be altered in height, width, length or contour. “Sports cars” (Karmann Ghia, Porsche, Opel GT, etc.) prohibited. Original steel body shell must be retained. Fiberglass or other lightweight components restricted to hood,


 page 33

fenders, splash pans, valance panels and rear deck lid are permitted. Such pieces must resemble stock components replaced. Lift-off hoods and deck lids permitted. Excessive weight reduction of body or body parts prohibited. No underhood modifications. Air dams and spoilers which are available through car manufacturer are allowed front and rear in classes E and F.

BUMPERS: Optional.

FENDERS: Four full stock-production required, duplicate fiberglass permitted. Rear fenders may be altered for wide tires and must have re-rolled or beaded edges.

FIREWALL: OEM mandatory.

GRILLE: Must be full stock production for body used.

HOOD SCOOPS: May not extend more than 5 inches above stock hood surface, one inlet only, and must be finished and painted to match body paint scheme.

STREET EQUIPMENT: Any street equipment which does not affect the external appearance may be removed except tail lights. Electric fans/water pumps permitted.  Stock wiring harness not required.

UPHOLSTERY: Full interior trim must be retained, equivalent to stock. Bucket seats in lieu of stock permitted (2 required) if they are full size, fully upholstered and in stock position. Aftermarket seats prohibited. Headliners and rear seats optional, factory type upholstery and/or paneling required in place of rear seats. Dash board exterior appearance must be maintained.appearance must be retained.

WINDSHIELD, WINDOWS: Windshield and windows must be clear or factory tinted safety glass. Windows need not be operative.

BATTERY: Trunk installation permitted. Maximum: 2. Total weight, wet, fully charged, including battery box: 100 Ibs.

BRAKES: Four-wheel brakes mandatory.

FRAME: Must be stock automobile frame for body used. Front-to-rear frame strengthening members may be added to unibody constructed car. 2” x 3” .120” minimum wall thickness, and located in straight line between front and rear subframe.  If material passes through floor, floor must be welded to member. Cross members may not be altered or relocated except as required for engine or transmission swaps, shock absorber and traction bar installations. Rear may be constructed of 2” x 3” rectangular material with .120 “ wall thickness and must be installed at original height location. 

FUEL SYSTEM: Fuel cells accepted, may be mounted in trunk. Minimum 5 gallons, maximum 16 gallon capacity. See General Regulations.

GROUND CLEARANCE: Minimum: In class A-F, 3 inches from front of car to 12 inches behind centerline of front axle, 2 inches for remainder of car, except oil pan and exhaust headers. Class F cars rocker panel bottom to ground measurement cannot be less than 5 inches.

MOTOR PLATES: Permitted Front and rear.

STEERING: Minimum steering wheel diameter: 13 inches.

SUSPENSION: Stock front required for year/model body used. Any automotive type rear accepted. One hydraulic shock absorber required per wheel. Minimum down travel at shock: 1 inch.

TRACTION BARS: Units must not be longer in overall length than one-half wheel base of car. Traction bars and/or mounting brackets must not be lower than lowest edge of rear wheel rim. Traction bars or any suspension component may not extend through floor of car. Interior floor must remain as originally produced: contour and material. Trunk floor from a point behind original rear seat to rear of car may be refabricated with same thickness materail as removed if ladder barss are used to locate rear axle housing an extra rod and suppoort is required to keep rear end positioned in th event of rod failure.

WHEELBASE: Must be stock for car body used. 105 inches maximum for all classes.  Maximum variation from left to right; 1 inch.

WHEEL AND TIRES: Must be equipped with automotive-type wheels and tires suitable for street use. Aftermarket street wheels and racing slicks permitted. Light weight automotive wire wheels or motorcycle wheels prohibited. Minimum wheel size, 13 inches, unless originally equipped with smaller wheels. No more than 2 inches of tire

tread may extend outside of rear fender. Clearance from outside of rear tire to inside of fender at widest point may not exceed 2 1/2 inches if tire is inside fender/body line. Tire tread may extend 1” outside of stock fender line in classes D through F, front-wheeldrive only.




The following is a partial list of the changes or clarification made to the 2015 IHRA rulebook.


Pro Classes: The Electrimotion shutoff safety device is mandatory in Nitro Funny Car, Pro Stock, Top Fuel and Pro Mod.

Top Dragster: The maximum dial for Top Dragster is 7.60 1/4 mile and 4.90 1/8 mile

Top Sportsman: The maximum dial for Top Sportsman is 7.80 1/4 mile and 5.20 1/8 mile. Full face helmets are mandatory on all entries in Top Sportsman.

Super Rod: An engine containment system is mandatory.

Junior Dragster: The age for the beginner class is 7 to 9.


General Regulation Points

The Pro-Am event claims structure for 2015 will be reduced to best 5 of 7 events.

The following is an amendment to the staging and starting system section in general race regulations: If both cars leave before the timing system is activated in any class, the competitor doing it first will be disqualified. If the race director is unable to determine who left first, both competitors will be disqualified.

Collectors that utilize springs or less than 4 tabs on collector and 4 tabs on primaries must use a secondary method for tethering collector. Tethering devices may be made from minimum 1/8" steel cable and t-bolt clamps or muffler clamps with locking fasteners.

SN-2000 helmets are not permitted in Quick Rod, Super Rod, Hot Rod, Super Stock or Stock.

SN-1995 helmets will not be permitted in any entry ET bracket class.


p. 59 Summit Sportsman Safety and General Rules: Add the following: Tail Light: A minimum of one functional tail light mandatory on all entries.



p. 33 Super Stock: Modified Stock: Hood: Delete the limitation of 5 inch high opening from the section. The maximum overall height is limited to 11 inches.


p. 87 Ignition: Add the number 7761 to the first sentence of the section. It should read as follows:"The use of any ignition system (eg MSD 7531) or related accessory (eg 7561 or power grid accessory 7761) that uses a multipoint or rate of acceleration rev limiter are prohibited from use in IHRA unless specified by individual class requirements.


p. 14 Top Sportsman: Transmission: Change the sentence in the middle of the section to read as follows: "All entries with pressurized transmissions must have interior sheet metal tunnel isolating drivers compartment from unit or the driver must use a 3.2A-15 driver suit if tunnel is not present."

p. 81 Delay Device: Delete the last sentence in the first paragraph and replace the first sentence of the second paragraph with the following: "All wiring associated with the delay device, throttle stop, ignition system, automatic shifter and electronic fuel injection must be fully visable, labeled and traceable. Delay devices and components must be utilized in an unaltered manner consistent with the manufacturer's installation and instruction books."

p. 56 Hot Rod: Replace the first sentence with the following: "An SFI 30.1 flexplate shield is mandatory on all entries running faster than 135 mph."


p. 19 Super Stock: Class designations: Add the following class: SS/BBS and SS/BBA.

Update the class break section to the following:

Class AA...5.00 to 5.49     INDEX - SS/AAS and SS/AAA 9.15 (1/4) & 5.95 (1/8)
Class BB...5.50 to 5.99     INDEX - SS/BBS and SS/BBA 9.80 (1/4) & 6.35 (1/8)


p. 24 Super Stock / GT: Change the third to last sentence of the designations section to the following: "Cars must have originally been equipped with a V-6 or V-8 or be IHRA accepted based upon original shipping weight."


p. 48 Pure Stock: Camshaft: replace 12/10/13 revision with the following: Camshaft must retain OEM lift, duration and overlap for horsepower claimed as verified by manufacturer supplied specifications. Aftermarket camshafts meeting specifications permitted. If complete engine package has not been supplied by manufacturer, the combination may not be classified for competition in Pure Stock.


p. 48 Pure Stock: Camshaft: Camshaft must retain stock lift for horsepower claimed per IHRA Technical Bulletins. OEM duration and overlap is optional

p. 52 Quick Rod: Engine Containment System: Engine must be equipped with an IHRA accepted engine containment system. All systems must cover the oil pump and related accessories.


p. 62 ET 11.50 to 13.49: Helmet: Change SN 90 to "SN 95" in the section.


p. 69 Jr. Dragster: Add to the class designations section as the last paragraph: "It is the responsibility of the team/parent to not dial-in or run under the ET breaks for the age groups listed above at all IHRA sanctioned events. This includes ET at Nitro Jam, Pro-Am, Team Finals and Jr Team Finals events. One warning will be issued to any competitor that dials-in quicker than his or her age group restriction. If the competitor does this a second time they will be disqualified."

The lowest dial-in for the respective age groups is the class index or 7.90 for Master, 8.90 for Advanced and 11.90 for Beginner.


p. Crate Motor Stock: Manifold: Change the wording of the first sentence to: "Any OEM or aftermarket cast aluminum or iron manifold that will fit under stock unaltered hood with no modifications allowed."


p. 13 Top Sportsman and p. 15 Top Dragster: Delete the following from the first paragraph. “Competitors may dial quicker between rounds, but may dial no slower than .10 beyond the slowest qualified car.” Competitors may dial any number they wish provided it is quicker than the posted maximum limitation for each class.

p. 70 Jr Dragster: Engine: Add the following to the accepted engine list. “ Briggs and Stratton 206 factory sealed crate engine. The crate engine must maintain un-tampered hologram seal installed at the factory. No alterations or modifications to Briggs & Stratton 206 crate engine permitted except for installation of exhaust header and air filter."


p. 69 Jr. Dragster Master: Change the following word to the end of the sentence in the middle of the paragraph: One warning will be issued if a competitor runs an elapsed time of 7.70 "or quicker or 85 mph or faster." 



Competitors in all divisions must have a minimum of 4 claims from events within the respective divisional schedule. Wild card events may not be used as the only source of in division claims. Wild card events are designed to help competitors living in certain regions, where Summit Pro-Am events are less concentrated, compete for a division championship while keeping costs of travel at a minimum. They are not intended to replace actual competition at the events within a division. At least 2 of the 4 mandated points claiming events in any division must be from events physically located within the division.

Due to its geographic location and the costs associated with traveling to any out of division events, the Border Bandits divisional schedule will continue to be limited to 4 in-division claiming events to determine the end of the season points. As was the case since inception of Division 6, there will be no out of division claims factored into any scores.

January 8, 2013


 p. 5 Summit Tournament of Champions: Under participant guideline delete the following from number 2: “(less any division champions – see below).” 

 p. 20 Super Stock: Engine:  Change overbore from .075 to .080 in the section.

 p. 26 Super Stock Production: Engine: Change overbore from .075 to .080 in the section.

 p. 42 Stock: Engine: Change overbore from .075 to .080 in the section. 

 p. 44 Stock: Upholstery: Add the following references for front seats to the section.  Delete all other reference to front seats in the section. 

 Full-size aftermarket or corporate OEM front seats permitted; must be upholstered and properly supported.”


This group is limited to any unaltered 2008 or newer foreign or domestic, production type automobile or truck that is street driven with proof of registration, vehicle insurance with valid license plates.  These vehicles are limited to street events, test & tune and select import events.  Competition in the facilities normal weekly ET bracket series under these parameters is prohibited.  

 These vehicles may run provided all of the criteria listed within this section is verified prior to participation.  Unaltered 2008 OEM model year and newer production cars running slower than 10.00 and 135 mph do not have to meet the requirements and specifications for the Summit Sportsman ET safety rules except for the following: Convertibles and T-top entries must meet the minimum specifications listed in ET Bracket section for roll bar and roll cage requirement.  Vehicles must pass all state highway safety requirements in which the vehicle is registered prior to acceptance.

 The vehicles OEM installed anti lock brakes, airbag function and seat belts as well as any other related system must be functional as per the manufacturers specifications at all times.

 All drivers must utilize helmet and protective clothing requirements as per the minimum specifications outlined in the 2013 IHRA rulebook under the ET bracket section starting on page 61.on the combination.




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