X275 Drag Radial has been the longest running drag radial category in our program with nearly nine seasons of some of the closest and most competitive racing on 275 drag radials that you’ll find anywhere. Over the years, there have been hundreds of cars that have competed in the class that changed the drag radial craze. Founder John Sears has been an integral part of the growth of the Outlaw Street Car Reunion and of X275, along with numerous other classes. X275 is a power limited category with numerous different engine and power adder combinations piled into one category rolling on 275 Drag Radials. Stock body lines and functional lighting makes the category very relatable for the avid fans in the stands that may have had a Ford Mustang or Chevrolet Camaro in the past or present. John Sears and a host of companies have joined together in 2017 to form the first season series with the X275 Championship Program, chasing points at select events across the country, with one racer standing tall at the end of the season as the top racer in the class for the season. The fourth running of the Outlaw Street Car Reunion was the second points race in the X275 Championship Series and we look forward to being a part of the series again in 2018. Listed below is our payout for the 2018 edition along with the class rules.
Presented by: Motion Raceworks, M&M Transmission and SpeedTech Nitrous
$10,000 to Win
$2,000 to Runner-Up
$750 to Semi-Finalists
$300 to Quarter-Finalists
$200 Entry Fee (Car & Driver)
Fully Guaranteed Purse
CLASS RULES & REGULATIONS
2018 Class Rules – As of December 9, 2017
The class designation is X275. All entrants must display this designation on both sides of their car with car number.
This is an 1/8th mile, heads up class run on a .400 Pro Tree. 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 professional ladder. This allows non-qualifiers to compete for additional points and a place to race. At larger events, 16, 32 or all run formats may be used. This is a single power adder class only!
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. Roots supercharged entries must have all safety gear, including blower restraint straps to comply.
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.
The car must retain its original appearance, profiles and dimensions. Factory roof and quarter panels must be used. 2005 and newer vehicles permitted, replacement roof panel. Factory firewall must be in factory location, notching/smoothing permitted but must be identifiable as stock location. 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 lengthened and must meet all NHRA/IHRA height, see ground clearance note below. Any beam tripping devices forward of the bumper are prohibited. 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/turbocharger/supercharger inlets are permitted.
Minimum 3 inches from front of car to 12 inches behind centerline of front axle, 2 inches for reminder of car, except oil pan, oil retention device and headers.
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 from firewall to rear of door jamb. Transmission tunnel may be removable and must be metal. Bare inside frame of car cannot be exposed. Aftermarket steering column is permitted.
OEM glass or Lexan windows are permitted.
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, only Chevy II or Dart permitted strut conversion). Shock tower can be notched or trimmed but must be in factory location, verifiable by the factory sheet metal being retained between frame rail and top of tower. Mini tubs are allowed. Rear frame rails may be notched for clearance and must be in the factory location. Factory wheelbase must be retained, +/- 1 inch.
Maximum displacement for all engines is listed below. Small Block, nitrous oxide combinations 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 10.7 deck height. Cylinder head specs and list for BB Nitrous combination attached. Billet SB/BB blocks permitted with cast cylinder heads only and a 50 lb. weight addition.
Single turbocharger limited to 88mm maximum. (Garrett GTX55-88, Exile ETR-88, or = Forced Induction, Comp, Bullseye – mid frame or current (2013) Gen II Pro Mod MF88, PTE LF85 or LF88 turbochargers only. Garrett GTX Gen II permitted. 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 (stepped or clipped compressor wheel prohibited). Inducer dimensions will not exceed 3.462 inches and exducer dimensions will not exceed 4.765 inches on mid-frame turbochargers. Inducer dimensions will not exceed 3.462 inches and exducer dimensions will not exceed 5.560 inches on large frame turbochargers. 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. Inserts or reducers to achieve inlet or outlet dimensions prohibited. Any type of air to air or water to air intercooler permitted. Turbochargers with nitrous oxide prohibited except on 2-rotor, 4-cylinder and inline 6-cylinder engines.
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 8-71. Centrifugal superchargers are permitted. Screw superchargers are not permitted.
Small Block is permitted to run any type multi-stage nitrous systems. Big Blocks are limited to a single stage fogger (2 nitrous solenoids, no limit on fuel solenoids) and two bottles are permitted or if using a single plate then you are limited to (1 fuel solenoid, 1 nitrous solenoid), and 1 purge solenoid, purge must exit engine compartment. Small Block & Big Block nitrous are permitted water injection. All 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 Nitrous BB combo are permitted. Cold nitrous systems permitted on small block and big block combinations. All lines on big block combinations must be visible and continuous from bottle to WYE without interruption.
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 small block and big block nitrous combinations only. Electric or Air shifters are permitted. Must not touch firewall or be mounted to firewall. Mid-Plate permitted. Roots supercharger combination not allowed lock-up style transmission.
Small Block combinations may run any type induction. Big Block nitrous combinations are limited to a dedicated single opening cast intake or cast tunnel ram with a single carb or a single 4150 or 4500 series throttle body. 4 Blade, dual blade or single blade throttle body permitted. Big Block N/A can run any style intake and carburetor/throttle body.
Dry sump oiling systems are permitted on all cars.
Mufflers or inserts are required on all cars except for turbocharged cars. Exhaust may exit underneath car or out the front fenders but must not affect timing or staging beams.
Gasoline/Alcohol/E85 permitted on all applications. Weights are based on gasoline (including E85) as the fuel. Any use of M1 will incur a 50 pound weight add. M1 used in addition to an intercooler is NOT permitted. Water injection permitted on SB/BB nitrous combinations only.
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.
Stock style or ladder bar suspension cars only, stock rear frame rail must be permanently attached and in the stock location. 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 subframe 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 (see notes below). Upper and Lower control arms must be mounted in the factory locations, -S box permitted. Late Model GTO and 5th Generation Camaro permitted bolt-in torque arm style suspension. Late model Mustang (Cobra Jet), Camaro (COPO) and Mopar Drag Pak permitted on their respective body type.
All cars with power adder must compete on a Drag Radial type tire with a following sidewall designation, 275/60/15 or 28×10.5 Pro Bracket Radial. Naturally aspirated combinations are permitted to run a 28.0″ x 10.5″ slick, no “W” tires permitted.
All minimum weights are with car and driver.
ENGINE/POWER ADDER/BASE CID/BASE WEIGHT
– 6 Cylinder / Diesel (Cummins) / Turbo 88mm / 3200 lbs.
– 4/6 Cylinder / Turbo 88mm / 2,750 lbs. (Nitrous Oxide Permitted)
– Small Block / Nitrous / 500 CID Maximum / 2,550 lbs.
– Small Block / Supercharger / 480 CID, 4.00/4.125″ (F1R/Xi) Inducer / 2,725 lbs.
– Small Block / Supercharger / 480 CID, 4.200″ (F1X/XB105) Inducer / 3,050 lbs.
– Small Block / Supercharger / 480 CID, 8-71 Roots / 2,750 lbs.
– Small Block / Turbocharger / 480 CID, 80mm x 130mm / 2,950 lbs.
– Small Block / Turbocharger / 480 CID, 85mm / 3,100 lbs.
– Small Block / Turbocharger / 480 CID, 88mm / 3,150 lbs.
– Big Block / Naturally Aspirated / 750 CID / 2,600 lbs.
– Big Block / Nitrous Oxide, Conventional Head / Up to 588 CID / 2,950 lbs.
– Big Block / Nitrous Oxide, Conventional Head / Up to 632 CID) / 3,100 lbs.
– Turbocharger weights based on Gen II PTE Pro Mod Series and Gen II GTX Series with maximum compressor exducer of 133mm (LF85/88 fall into this weight.
– Add 50 lbs. for Billet Head (Must be used with cast block only of stock bore space/deck height).
– Add 50 lbs. for Boosted Combination for M1 (Intercooler not permitted with use of M1 as primary fuel).
– Add 50 lbs. for Billet Block (Must be used with cast cylinder head only and be stock bore space/deck height, excluding mod motor).
– Add 50 lbs. for Lock-Up Converter/Transmission
– Add 50 lbs. for SR20 or Equivalent BB Cylinder Head, must maintain 20 Degree Valve Angle and Conventional Port layout.
– Deduct 75 lbs. for Stock Valve Angle (23 Degree GM / 20 Degree Ford / 18 Degree Mopar / 15 Degree LS)
– Deduct 50 lbs. for Stock Valve Angle Raised Runner (23 Degree GM / 20 Degree Ford / 12 Degree LS)
– Deduct 50 lbs. for F1C-10.5 (from 4.00 Base Weight)
– Deduct 100 lbs. for F1A-104 (from 4.20 Base Weight)
– Deduct 50 lbs. for 4150 Carburetor/Throttle Body
– Deduct 100 lbs. for GTX55-85 or GTX55-88 GEN 1 Turbocharger (118mm Compressor Exducer)
– Deduct 100 lbs. for Plate Nitrous System
– Deduct 200 lbs. for 8.2 Deck or Mod Motor (If Mod Motor billet block is used, deduct is only 100 lbs.)
** If one combination appears to have an advantage, rules may be changed at the race director’s discretion at ANY time in order to keep a level playing field for all competitors.
** Rules from X275.net