2013 - X275 Rules

 

FORMAT:
This is an 1/8 mile heads-up class run on a .400 pro tree with a pro ladder. X275 is a qualified quick 8 field. Courtesy staging and auto-start is in effect. There will also be another class called “The Shootout” for qualifiers #9-16, and it will be run on a pro ladder. This allows non-qualifiers to compete for additional points and a place to race. (At larger events 2 – 16 or 3 - 8 or 3 -16 car fields or all-run format may be used)

 

SAFETY:
All NHRA/IHRA and Local Track Safety rules apply for driver and car, including the use of an oil retention device or engine diaper.

 

BODY:
The car must retain its original appearance, profiles, and dimensions. Factory roof and quarter panels must be used. Aftermarket fiberglass and/or carbon fiber replacement panels are limited to hood, front fenders, doors, deck-lids, and bumpers only. All front ends must be of factory dimensions and cannot be stretched. Aftermarket wings and spoilers are permitted. Complete stock appearing front and rear bumpers are required. A hood must be used: scoop or hood must cover the entire induction system. Forward facing hood scoops/ turbo or supercharger inlets are permitted. Beam trippers, extenders prohibited.

 

INTERIOR:
Factory appearing dashboard, door panels, and driver seat is required. Full Carpet is required on floorboards including transmission tunnel. Factory floor pan on driver and passenger side required. Transmission tunnel maybe removable and must be metal. Bare inside frame of car cannot be exposed. Aftermarket steering column is permitted.
WINDSHIELD/WINDOWS:
OEM glass or lexan windows are permitted.

 

CHASSIS:
Complete stock chassis and frame rails must be retained from motor plate/shock tower to behind the rear wheel opening. Back-halved cars are not permitted. Front core support may be modified or removed. Aftermarket bolt-on replacement front K-members/sub frames are allowed (if front shocks bolt to K-member then they must be in factory location). Mini tubs are allowed. Rear frame rails may be notched for clearance and must be in the factory location. Factory wheelbase must be maintained. (+ or – 1 inch)

 

ENGINE:
Maximum displacement for all engines is 588ci. Small blocks are allowed any deck height but must retain stock bore spacing. Big block allowed the following deck heights but must retain stock bore spacing. GM Big Blocks are limited to a 10.2 deck height. Ford Big Blocks are limited to a 10.3 deck height. Mopar Big Blocks are limited to a 10.7 deck height. (Cylinder head specs and list for BB Nitrous Combos to be released)

 

TURBOCHARGERS:
Single turbocharger limited to 88 mm maximum. (GT55-88, Pro-Mod 88, ET-R88, Comp, Bullseye or = mid/large frame turbo). Turbocharger size will be verified by measuring the housing bore at the leading edge of the impeller wheel and must maintain the contour of the compressor housing. Inducer dimensions will not exceed 3.462 inches and Exducer dimensions will not exceed 4.765 inches on MID FRAME turbos. Inducer dimensions will not exceed 3.462 inches and Exducer dimensions will not exceed 5.56 inches on LARGE FRAME turbos. The maximum diameter of the housing bore at the leading edge of the wheel may not exceed 2 mm more than the maximum allowable turbocharger size permitted and LF 85/88 with surge slots/holes must have a cover over the slots/holes that stand off by no more than .250. Inserts or reducers to achieve inlet or outlet dimensions prohibited. Any type of air to air or water to air intercooler permitted. Turbochargers w/nitrous-oxide prohibited except on 2-rotor, 4 cylinder, and inline 6 cylinder engines.

 

SUPERCHARGERS:
Cog or gear driven superchargers are permitted, must meet all factory inlet, outlet, and internal housing dimensions. Inserts or reducers to achieve inlet or outlet dimensions prohibited. Any type intercooler is permitted. Supercharger cannot be combined with nitrous oxide. Roots superchargers are limited to a 10-71. Centrifugal superchargers are permitted. Screw superchargers are not permitted.

 

NITROUS OXIDE:
Small block is permitted to run any type multi-stage nitrous systems. Big blocks are limited to a single stage nitrous system with single -6 line(**see below for accepted line) to fogger single wye to -4 line(**see below for accepted line) connected to fogger solenoids or single -6 line (** see below for accepted line) to plate solenoid(s) – A single stage fogger (2 nitrous solenoids and 2 fuel solenoids) are permitted or if using a single plate then your limited to (1 fuel solenoid, 1 nitrous solenoid), and 1 purge solenoid, purge must exit engine compartment. EFI Big Blocks will only be allowed 2 nitrous solenoids for a dry nitrous system and will only have 1 line per nozzle/per cylinder. (Using both sides of the fogger nozzle on a dry EFI NOS BB combo are prohibited)(Push systems prohibited)

 

TRANSMISSION:
Any factory style automatic transmission allowed. OEM factory style manual transmission allowed. Bruno-Lenco transmissions are prohibited. Aftermarket clutchless manual transmission and clutch assisted manual transmissions are permitted on naturally aspirated combinations only. Electric shifters or air shifters are permitted.

 

INDUCTION:
Small Block combinations may run any type induction. Big Block combinations are limited to a dedicated single opening cast intake with a single carb or a single 4150 or 4500 series throttle body. (4 blade, dual blade or single blade throttle body permitted)

 

OILING SYSTEM:
Dry sump oiling systems are permitted on all cars

 

EXHAUST
Mufflers or inserts are required on all cars except for turbo cars. Exhaust may exit underneath car or out the front fenders but must not affect timing or staging beams.

 

FUEL:
Gasoline only is permitted. Alcohol/E85 permitted on roots blown/V6/Inline-6/4cyl applications. Alcohol or E-85 or other derivatives is prohibited on all other combinations. Meth injection prohibited. Water injetion permitted on SB NOS combos only.

 

STREET EQUIPMENT:
Functional headlights, taillights and brake lights required. All headlights, brake lights, etc. must be on car and not removed for any reason. All vehicles may be towed back from their passes.

 

SUSPENSION:
Stock style or ladder bar suspension cars only. Aftermarket four links are prohibited on all cars. Aftermarket direct replacement components such as: front control arms, rear control arms, front coil over shocks, and rear coil over shocks are permitted. Aftermarket rack and pinion steering allowed. Rear leaf springs, springs, shocks, and coil-overs may be moved to accommodate tire clearance, and do not need to be mounted in stock location. Bolt-on or welded sub-frame connectors, rear sway bars, are permitted on all cars. Wheelie bars are prohibited on all cars. Torque arms are only permitted on cars that were originally equipped from factory with it. Upper and Lower control arms must be mounted in the factory chassis locations -S Box permitted

 

TIRES:
All cars with power adder must compete on a Drag Radial type tire with the following sidewall designation 275/60/15. Naturally aspirated cars are permitted to run a 28.0” x 10.5” slick, no “W” tires permitted.

 

Minimum base Weights:

All minimum weights include the driver.
Naturally Aspirated (small block) 2500 lbs
Naturally Aspirated (big block) 2700 lbs
Nitrous (small block) 2850 lbs
Nitrous (big block single stage plate any deck height & conventional heads) 3200 lbs
Nitrous (big block single stage fogger standard deck height & conventional heads) 3250 lbs
Nitrous (big block single stage fogger with tall deck height and conventional head) 3350 lbs

Single YSI / F1A/6-71 Supercharger (small block) 2950 lbs
Single F1C/8-71 Supercharger (small block) 3050 lbs
Single F1R/Xi/10-71 Supercharger (small block - *mod motor or with stock valve angle heads) 3250 lbs
Single F1R/Xi/10-71 Supercharger (small block) 3300 lbs
Single F1X/XB105 Supercharger (small Block - *mod motor or with stock valve angle heads cast head only) 3400 lbs

 Single 76mm T6 Turbocharger (mid frame) (small block) 2700 lbs.
Single 80mm T6 Turbocharger (mid frame) (small block) 2800 lbs.
Single 85mm T6 Turbocharger (mid frame) (small block) 2900 lbs.
Single 88mm T6 Turbocharger (Y2K or GT47-88 ) (mid-frame) (small block) 3000 lbs
Single 85mm T6 Turbocharger (Pro Mod 85) (mid frame)(small block) 3050 lbs
Single 88mm T6 Turbocharger (GT55-88, Pro Mod 88 or =) (small block) 3100 lbs
Single 85mm T6 Turbocharger (Large Frame 85) (small block – mod motor or stock valve angle cast head only) 3200 lbs
Single 85mm T6 Turbocharger (Large Frame 85) (small block) 3250 lbs
Single 88mm T6 Turbocharger (Large Frame 88 ) (small block – mod motor or stock valve angle cast head only) 3300 lbs
Single 88mm T6 Turbocharger (Large Frame 88 ) (small block cast head only) 3350 lbs

* Small Blocks (NOS & N/A) with single 4150 carb/throttle body: deduct 50lbs
*Small Block (NOS) with any plate nitrous system: deduct 50lbs (deduct does not apply if used in conjunction with fogger)
* Small Blocks (NOS & N/A) with 23 degree Chevy heads, 20 degree Ford heads, and 18 degree Mopar heads: deduct 100lbs.
* Small Blocks (NOS only) 18–10 degree valve angle inline head: deduct 50 lbs
* Small Blocks (NOS only) cast t-ram/sheet metal/2 carbs or 2 throttle bodies: add 100 lbs
* Non-Intercooled boosted cars on gasoline: deduct 50 lbs
* Belt driven centrifugal superchargers: deduct 50lbs
* Sheetmetal or cast ram type intake on boosted/blown combo: add 50 lbs.
*Billet heads permitted, billet blocks not permitted (add 50 lbs for billet head)
* Aftermarket rear suspension COPO Chevy and Drag Pack permitted on the new Camaro and Challengers must be mounted in exact factory location on body/frame. Torque arm on late model GTO. Corvette with any leaf spring suspension permitted.
* Buick/Olds/Pontiac Nitrous combos will be 3150 lbs and not to exceed 588 cu inches
* V-6/Inline 6/4 cylinder Turbocharged/Supercharged/Nitrous combos will deduct 200 lbs from base weight on gas and 100 lbs. if on alcohol
*Factory IRS deduct 50 lbs
**-6 and -4 nitrous line(s) must be of standard braided line construction, (high pressure hydraulic line prohibited as they exceed the internal diameter of industry standard) Standard spec lines only.

If one combination appears to have an advantage rules may be changed at the race director’s discretion in order to keep a level playing field for all competitors