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St. Louis

LAS VEGAS // Nov 19-22, 2020

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ST. LOUIS // August 14-15 2020

RACE INFO  |  PAYOUTS  |  CONTACT   |  CONTINGENCY STORE  |  CLASS RULES  |  CONTENDERS  |  SPONSORS

class rules/ St. Louis Mickey Thompson 275 Radial

X275 is a 1/8-Mile Heads-Up Class run on a .400 Pro Tree / "All-Run Qualified Field" on a Pro Ladder with Auto-Start.

 

X275 Radial Racers can follow the following Rule/Weight set exactly or we also allow all of John Sears X275 legal combos at current 2019 X275 Rules/Weights

 

X275-Radial will run on a 1/8th mile format with a "Qualified" All-Run field

 

X275 CLASS GUIDELINES:

 

BODY:

The car must retain its original appearance and profiles. Aftermarket fiberglass parts are limited to hood, fenders, doors, deck lid and bumpers, one-piece front-ends are allowed, but must retain factory appearing grill, head lights, and marker lights. The driver and passenger doors must be fully operational and must open from the outside.

 

BRACKET RACING AIDS:

The use of bracket racing aids such as optical sensors, delay boxes, and throttle stops are prohibited

 

FIREWALL:

Must retain factory unaltered firewall, in factory location. A cosmetic overlay is permitted.

 

HOOD / SCOOPS:

Cowl & forward-facing hood scoops are allowed. Scoop or cowl may not exceed more than 9 inches at the highest point of the air inlet opening above the height of the original hood flat surface.

 

INTERIOR:

All factory interior pieces including pedal assemblies must be in factory locations. Covered/Painted Door Panels & OEM Appearing dashboard are required. Back seat may be deleted but must have carpet covering the bare floor.

 

LETTERING / DECALS:

X275-Radial Class sponsor decal (Mickey Thompson Tires) must be placed in the lower passenger corner of the front windshield PSCA Series Sponsor decal (MagnaFuel) must be placed in the lower passenger corner of the front windshield. SCSN Decals must be placed on both left & right sides of race car on the rear 1/4 Window, 1/4 Panel or Side of Rear Wing in a highly visible location. Front upper windshield cannot have another racing organization banner or decal (these must be removed or covered in black tape prior to qualifying.)

 

SEAT LOCATION:

Driver Seat must remain in the stock location.

 

CHASSIS / SUSPENSION

 

FRONT SUSPENSION:

All cars must retain stock suspension, aftermarket tubular control arms, coil over kits, or OEM front strut retrofits are permitted. Replacement Bolt-on Lightweight K-Members are legal, but must be a direct bolt on, no welding modifications permitted. Stock wheelbase will be enforced on all vehicles. You can weld tubes from your roll cage to the front suspension.

**The only front suspension bolt-on kit deemed legal by the PSCA are the CHRIS ALSTON No Fab, AJE, HEIDTS, Smith Racecraft and *FATMAN bolt-on kits (for 62-67 Nova's, 67-69 Camaro's & early Mustangs) Total Control Products Coil Over Conversion Kits, and The Rod & Custom Motorsport Mustang II kit for 64 1/2-66 Mustang, DoubleAAPerformance K-Member for G-Body, Part #RC-106 & Skinny Kid front end kits for late model Mustangs.... Kits must be installed as instructed and not modified in any manner.

 

K-MEMBER:

Aftermarket factory-replacement-type K-member permitted, but must attach to the chassis using only the original factory OEM-type mounting bolts. No part of the K-member may be welded to the chassis.

 

REAR SUSPENSION:

Bolt on traction devices are permitted. Leaf springs may be relocated for tire clearance purposes. Ladder Bar Type Suspension with Factory Frame Rails is legal.

 

FRAME & CHASSIS:

Stock frame rails must be retained in stock locations (NO EXCEPTIONS) front and rear. Notching of rear frame rails for tire clearance is permitted. Sub frame connectors are permitted.

 

ENGINE:

650ci Limit for Big Blocks with a MAX Bore Space of 4.84 - 480ci Limit for Small Blocks with a MAX Bore Space of 4.40

 

ENGINE MOUNT LOCATION:

Engine must remain in stock location. Engine may not touch the factory unaltered firewall. Motor plates are permitted.

 

HEADS:

Aftermarket cylinder heads, aluminum or cast iron are allowed (No Billet Heads Permitted except on Small Block Nitrous & Small Block Turbo Combos), See Weight Ads below

 

NITROUS:

Any nitrous combo is legal but cannot be used with any other power adder except by I-6 Combo (See Weights Below).

 

SUPERCHARGER:

Any Roots (Up to 12.71) or Centrifugal MAX 4.5 Inducer Diameter) Equivalent or smaller with the following specs must be approved by the PSCA before being deemed legal:

MAX Inlet Hose Diameter 5.00" MAX Inducer Diameter 4.50" MAX Exducer Diameter 6.75" MAX Outlet Inside Diameter 3.59"

 

TURBOCHARGER:

Accepted Single Turbochargers: 94mm Single Turbochargers are permitted on V6 and Small Block V8 engines in accordance with the following requirements:

1) Turbocharger must be of conventional impeller and

housing design and type.

2) Turbocharger is limited to a maximum size

of 3.701 inches (94mm) inducer diameter at the point where the leading edge of the compressor wheel meets the inlet housing.

3) Compressor cover inlet is permitted a maximum inlet diameter of 3.792 inches (96.3178mm)

4) Compressor Wheel to housing clearance must maintain a maximum 0.091 (2.3114mm) clearance beginning from a) the leading edge of the compressor wheel where it meets the inlet of the compressor housing, to b) the transition point where the trailing edge of the compressor wheel meets the volute.

5) All air entering the turbocharger must pass through the turbocharger inlet.

6) Injection of any liquid, gas, or any other substance into the inlet or exhaust

housing prohibited.

7) Compressor wheel contour must be continuous features from the inducer to the exducer (no "stepped" wheels).

 

Accepted Single Turbochargers: 98mm Single Turbochargers are permitted on V6 and Small Block V8 engines in accordance with the following requirements: 1) Turbocharger must be of conventional impeller and housing design and type. 2) Turbocharger is limited to a maximum size of 3.858 inches (98mm) inducer diameter at the point where the leading edge of the compressor wheel meets the inlet housing. 3) Compressor cover inlet is permitted a maximum inlet diameter of 3.949 inches (100.3114mm) 4) Compressor Wheel to housing clearance must maintain a maximum 0.091 (2.3114mm) clearance beginning from a) the leading edge of the compressor wheel where it meets the inlet of the compressor housing, to b) the transition point where the trailing edge of the compressor wheel meets the volute. 5) All air entering the turbocharger must pass through the turbocharger inlet. 6) Injection of any liquid, gas, or any other substance into the inlet or exhaust housing prohibited. 7) Compressor wheel contour must be continuous features from the inducer to the exducer (no "stepped" wheels).

 

Accepted Twin Turbochargers: 72mm or 67mm Twin Turbochargers are permitted on V6 and Small Block V8 engines in accordance with the following requirements:

1) Turbocharger must be of conventional impeller and

housing design and type.

2) Turbocharger is limited to a maximum size

of 2.637 inches (67mm) inducer diameter at the point where the leading edge of the compressor wheel meets the inlet housing.

3) Compressor cover inlet is permitted a maximum inlet diameter of 2.728 inches (69.3114mm)

4) Compressor Wheel to housing clearance must maintain a maximum 0.091 (2.3114mm) clearance beginning from a) the leading edge of the compressor wheel where it meets the inlet of the compressor housing, to b) the transition point where the trailing edge of the compressor wheel meets the volute.

5) All air entering the turbocharger must pass through the turbocharger inlet.

6) Injection of any liquid, gas, or any other substance into the inlet or exhaust housing prohibited.

7) Compressor wheel contour must be continuous features from the inducer to the exducer (no "stepped" wheels).

 

FUEL / FUEL SYSTEMS:

Gasoline (Race Gas), Alcohol and E-85 are the only legal fuels permitted. Nitro-Methane is strictly prohibited

 

Front Tires: Must have a minimum tread width of 4.5 inches. Front tires do not have to be DOT approved.

 

Rear Tires: Mickey Thompson 275/60R15 (3754x) Drag Radials or M/T 3055, 3055c or 3055s or any 28x10.5 slick (non-w) or shorter/narrower

 

WHEELBASE:

Must retain stock wheelbase with a maximum variation right to left and front to back of one inch.

 

WHEELIE BARS:

Wheelie bars are not permitted (any type of device other than factory OEM frame/suspension/body parts used to control a wheelie/wheel-stand in any way is also prohibited)

 

WEIGHT GUIDE

 

Base Weight (All weights are race-ready, car with driver)

4 Cly W/Any Power Adder.................................................2500 lbs

V/6-I/6 Nitrous....................................................................2600 lbs

V/6-I/6 Turbo or Blower.....................................................2900 lbs

V/6-I/6 Turbo or Blower W/Single Fogger Nozzle.............3100 lbs

Small Blocks W/Nitrous......................................................2600 lbs

Small Blocks W/Turbo (up to 80mm) .................................2900 lbs

Small Blocks W/Turbo (80.01 to 88mm) .............................3250 lbs (Mid-Frame, Y2K or GT47-88 3050 lbs)

Small Blocks W/Turbo (88.01 to 94mm) .............................3300 lbs

Small Blocks W/Turbo (94.01 to 98mm) .............................3500 lbs

Small Blocks W/Twin Turbo (up to 68mm ea) .....................3275 lbs

Small Blocks W/Twin Turbo (72mm ea) ..............................3350 lbs

Small Blocks W/Supercharger (up to 4.090" Inducer)..........3050 lbs

Small Blocks W/Supercharger (4.091-4.200" Inducer).........3200 lbs

 

Small Blocks W/Supercharger (4.201-4.500" Inducer)........3300 lbs

Big Blocks Nitrous up to 550ci............................................2800 lbs

Big Blocks Nitrous 551ci to 600...........................................2900 lbs

Big Blocks Nitrous 601ci to 650ci Max................................3000 lbs

Big Blocks Roots Supercharged 600ci Max..........................3500 lbs

 

WEIGHT ADDS & BREAKS:

  • Add 50 lbs. For Small Blocks using SC1, Brodix (BF 200 & 300 Series) Brodix (CV SP265 & SP330) All Pro (- 2) Mast (Mozez) .....Similar Canted Valve and any Symmetrical Cylinder Heads will be evaluated on a case by case basis
  • Add 100 lbs. Small Blocks using Dart "Little Chief" CFE "SBX" or Similar Style Heads
  • Add 100 lbs. For Big Blocks Using any Canted, Splayed Valve, Big Chief Style Cylinder Heads Deduct 50 lbs. For Rear Leaf-Spring Suspension
  • Deduct 100 lbs. For Small Blocks less than 358ci
  • Deduct 350 lbs. For no Power Adder.

 

SCSN Required Decals:

 

CLASS SPONSOR DECAL:

"Mickey Thompson Tires" must be installed on base of windshield on the passenger side. (Bottom left- hand side when looking at front of vehicle windshield) before entering the tech area.

 

SCSN SERIES DECALS:

"SCSN" decals must be placed on both left & right sides of race car on the rear 1/4 Window, 1/4 Panel or Side of Rear Wing in a highly visible location

 

CONTINGENCY AND CONTINGENCY SPONSOR DECALS:

In order to receive Contingency Monies from any of the listed Contingency Sponsors, you must have the correct product listed and matching Contingency Decal for that product on your car for the entire SCSN Racing Event... Racers will be checked for Products & Decals while be teched in and Winner & Runner-up again will be checked in the Winner's Circle after the conclusion of each event. Winner & Runner-up failing to show up for this mandatory Inspection will forfeit all Contingency Money that is owed!!!! All Contingency Decals may appear anywhere on the vehicle in a clear and organized fashion. Contingency decals may not be overlapped or modified. Most decals are available at the SCSN Event Trailer, but in the event the SCSN does not have the decals in stock, it is the racer's responsibility to obtain the proper decals to be eligible for the Contingency payout.

 

 

FIELD SIZE & LADDER:

X275 is an all run qualified field on a NHRA Pro-Ladder

 

TOW BACK & TOW VEHICLES:

All X275 entries can tow to staging lanes and to the track scales with a golf cart or other similar small tow vehicle. All carts will be subject to search by a SCSN Official at any time.

 

ALTERNATING LANES DURING QUALIFYING:

Each X275 driver must alternate lanes during qualifying. If you choose to ignore this rule, your second consecutive pass in the same lane on the same day will be disqualified.

 

AUTO-START:

The Auto-Start System will be turned on with a 7-sec timeout

 

 

 

QUESTIONS??

Heather Roth: Event Coordinator

heather@streetcarsupernationals.com

Call/Text 1-702-701-6464

 

Mel Roth: President

mel@racepsca.com

Call/Text 1-661-917-3078

 

 

All rules subject to change at the sole discretion of the SCSN Technical Services Department.

QUESTIONS??

Heather Roth: Event Coordinator

heather@streetcarsupernationals.com

Call/Text 1-702-701-6464

Mel Roth: President

mel@racepsca.com

Call/Text 1-661-917-3078