Atlas Performance Limited 235 Presented by Rocky Mountain Plumbing is a heads-up 1/8th mile class for all types of Rear Wheel Drive Vehicles from Classic 50’s Iron, 60’s Muscle Cars to Late Models Hot Rods & Trucks. This class is going to feature limitations in Cubic Inch Displacement, Power Adders and all cars will have to use a Small Rear Radial Tire (235 M/T Drag Radial Part # 3450 or 3752R Only)
Limited 235 will run on a 1/8th mile format with an all run field
BODY: The car must retain its original appearance, materials and profiles. Aftermarket Fiberglass or Carbon Fiber Body Parts limited to Hood, Deck-lid and Bumpers only. Rear Mini-Tubs or altering of factory wheel tubs are permitted however no full-size wheel tubs will be allowed.
FIREWALL: Must retain factory unaltered firewall, in original location. A cosmetic overlay is permitted.
FLOORBOARD: Must retain the factory Floorboard from Firewall to beginning of Trunk/Hatch area… Trunk/Hatch/Spare Tire area can be modified/flattened for battery placement, Fuel Cell etc.
GRILL / FRONT BUMPER: Factory Grille and Front Bumper must be of original design with no alterations to allow additional Air-Inlets
HOOD: No Forward-Facing Hood Scoops of any design or Air-inlets added for Blower/Turbo Cars
INTERIOR: Factory appearing door panels, carpet and dashboard are required. Back seat may be deleted but must have carpet covering the bare floor.
SEAT & SEAT LOCATION: Two front full-size bucket seats, or one bench seat with upholstery required. Seats must remain in the factory location without. Nitrous Bottle, Ignition box or any other device cannot be mounted within the passenger side seat.
WINDOWS: Must be factory OEM Glass, no Lexan permitted…. 1 exception, rear window on a truck if the roll-cage goes into the bed
CHASSIS / SUSPENSION
FRAME & CHASSIS: Stock frame rails must be retained in stock locations front and rear, notching of rear frame rails is allowed (No Full Back Half Chassis Permitted) Sub frame connectors are permitted.
FRONT SUSPENSION: All cars must retain stock-type front suspension. Aftermarket Tubular Control Arms, K-Member & Coil Over kits are legal but must completely be a bolt-on conversion. Bolt-On Firewall forward are not legal unless noted below**. 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.
**The only front suspension firewall forward bolt-on kits deemed legal by the PSCA are the CHRIS ALSTON No Fab (Mild Steel/A-Arm version only) / Figment Design & Chassis Gen II Mild Steel Front Clip / *FATMAN bolt-on kits (for 62-67 Nova’s, 67-69 Camaro’s & early Mustangs) / The Rod & Custom Motorsport Mustang II kit for 64 1/2-66 Mustang, AJE CN-6267, these kits must be installed as instructed and not modified in any manner. If you have a mild steel constructed bolt-on kit not on this list and want to see if it could be added, email us at firstname.lastname@example.org and include, manufacturer & part number
REAR SUSPENSION: After-Market Control Arms, Bushings, Shocks, Leaf Springs, Torque Arm & Coil Springs are OK to upgrade if all Factory/OEM Suspension Attaching Points are utilized in the way they came from the vehicle manufacturer with the following exception: On Mini-Tub or vehicles with Leaf springs moved inward, Shocks must still follow the same angle and placement as factory equipped (so if the bottom bracket is moved in 2′′ the top must do the same). Bolt On
Traction/Slapper Bars are allowed. No Ladder Bar Rear Type Suspension, No Wheelie Bars, No Off-set Coil Spring Kits,No Coil-Over Shock/Spring Conversion permitted.
WHEEL BASE: Must retain stock wheel base with a maximum variation right to left and front to back of one inch.
WHEELIE BARS: Wheelie bars are strictly prohibited and not permitted.
AUTOMATIC TRANSMISSIONS: Any OEM automatic transmission permitted. Aftermarket torque converter, shift kit, valve body, shifter, and pan cooler use are permitted. Trans brakes are permitted.
MANUAL TRANSMISSION: After-market Standard Manual Transmissions are allowed except for Clutchless-Types, Clutch/Automatics or Planetary Transmissions. All shifts must be made manually without the aid of electric, hydraulic or pneumatic devices.
ENGINE / ELECTRICAL
BRACKET RACING AIDS: The use of bracket racing aids such as optical sensors, delay boxes, and throttle stops are prohibited
ENGINE: 515ci Limit for Power Adder Big Blocks – 525ci Limit for NA Big Blocks – 444ci Limit for Nitrous and NA Small Blocks – 415ci for Boosted Small Block (See Weight Breaks)
ENGINE BLOCK: Aftermarket Cast Iron are allowed. (No After-Market Aluminum or Billet Blocks permitted)
ENGINE MOUNT LOCATION: Engine must remain in factory stock OEM location. Engine may not touch the factory unaltered firewall. Motor plates are permitted.
ON BOARD DIAGNOSTICS / DATA RECORDERS: On board diagnostic computers and recorders are permitted. Memory and playback tachometers are allowed.
STREET LEGAL REQUIREMENTS: All cars are required to have Left & Right working headlights and tail lights
TRACTION CONTROL: Strictly Prohibited… Vehicle cannot have any form of a Drive-Shaft Sensor… Driveline will be checked in Tech and Random checks will be made during race weekends… If you are caught violating these rules, Car & Driver will be suspended from future PSCA Events (Including Street Car Super Nationals St Louis & Las Vegas) for the period of 13-Months.
INDUCTION – EXHAUST
CARB NITROUS ASSISTED: Any 4150 Based of Conventional design 4-Barrel is Max permitted (no 4500 Series/Dominators allowed on a power adder combo)
CARB NA COMBO: Any 4150 Based of Conventional design 4-Barrel is Max permitted (4500 Dominator is allowed at a 100lb weight penalty)
EFI: Any EFI system is permitted but throttle body is limited to 92mm or a 4150 Series 4-Barrel
FUEL: Gasoline (Race Gas) and E-85 are the only legal fuels permitted. CYLINDER HEADS: (See section in weight add section)
INTAKE (POWER ADDERS): 4150 flange as-cast aluminum of conventional 1-piece design (Non-Tunnel-Ram) Intake Manifold. Intake must have a visible part number from the manufacture to prove its of original 4150 design. Porting is allowed but intake cannot be cut-up, welded-on or altered in any way from its original design. If you’re not sure, please email us at email@example.com with your questions LS/LSX Legal Composite Intakes: FAST 54039, 146302 / Weiand 5000 / Professional Products Typhoon
INTAKE (Naturally Aspirated): 4150 or 4500 flange cast aluminum (Unless listed below) of conventional 1-piece design (Non-Tunnel-Ram) Intake Manifold. If you are not sure, please email us at firstname.lastname@example.org with your questions. 4500 Intake and or 4500 Series Carb add 100lbs
MUFFLERS: REAL Production Mufflers are required all 235 Limited cars, no Collector Mufflers permitted unless a Real Muffler is also in place. Modification or removal of muffler internals is prohibited (no gutting). If you are not sure what a “REAL MUFFLER” is (at least 6′′ of the muffler “Main Body” is required) email us at email@example.com Don’t blame us if you show up to race with a fabricated tube you may think is a muffler and you DO NOT pass tech inspection… Still not sure, email a photo of what you got to firstname.lastname@example.org
INTERCOOLER: Air to Air legal with a 25lb weight Deduct. Air to Water legal but complete system must be mounted from the firewall (engine side) forward… This includes everything including Intercooler, tank, lines, etc.
NITROUS SMALL BLOCK:
Any 4150 Nitrous Plate is legal but cannot be used with any other power adder and with the following restrictions.
- Only one (1) 10lb Nitrous Bottle is permitted)
- Only one (1) -4 Nitrous Bottle line (Both ends) to Solenoid is permitted (Max .147-ID
- Only one (1) .125 MAX Orifice Size Nitrous Solenoid is permitted
- Only one (1) Fuel Solenoid is permitted
- Only one (1) Small Purge Solenoid Permitted (Purge plume must be entirely outside of the engine bay and directed upward)
NITROUS BIG BLOCK:
Any 4150 Nitrous Plate is legal but cannot be used with any other power adder and with the following restrictions.
- • Only one (1) 10lb Nitrous Bottle is permitted
- • Only one (1) Fuel Solenoid is permitted
- • Big Block Combo can use -6 line and any size single Nitrous Solenoid with a MAX Jet Size .125
- • Only one (1) Small Purge Solenoid Permitted (Purge plume must be entirely outside of the engine bay and directed upward)
SUPERCHARGER-SMALL BLOCK ONLY: 10-Rib Max Belt (Cog Belt ok by adding 50lbs, No Direct Drive) LEVEL 1 (3200lbs) VORTECH: V3-SCI, V2-S, V2-SC, V2-SCI, V1-S, V1-SC & V1-SCI / ProCharger: PB600B, P1iSC, P-
1SC-1 & P-1SC- 2 LEVEL 2 (3300lbs) VORTECH: V3-SI, V2-SI, V2-E & V2-SCI / ProCharger: D1 & D1SC / KenneBell: 2.6 LEVEL 3 (3400lbs) VORTECH: V2-Ti, V1-Ti / ProCharger: F1, F1A & F1D / KenneBell: 2.8 & 2.8LC / Paxton: Novi-2000 LEVEL 4 (3500lbs) VORTECH: V7-J, V7-JT, V7-YSi & V2-7YSi/ ProCharger: F1A-91, F1A-94 / KenneBell: 3.6LC
ACCEPTED SINGLE TURBOCHARGER:
Compressor and turbine wheels, blades, hubs, cover, or housing modifications are PROHIBITED and must be run as produced
76mm with the following guidelines: Accepted Single Turbochargers: 76mm 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 the following: Turbine: Inducer maximum diameter 3.94” (100mm) Exducer maximum diameter 3.60” (91.4mm) Hub minimum diameter 1.00” (25.4mm) measured at intersection with blade trailing edge.
Housing maximum bore diameter 3.690 (93.73mm). Wheel must protrude into this bore diameter minimum 0.25”. Compressor: Cast wheel inducer maximum diameter 2.993” (76mm) Exducer (overall) maximum diameter 4.567” (116mm). Billet wheel inducer maximum diameter 2.875” (73.03mm) Exducer (overall) maximum diameter 4.567” (116mm). Hub minimum diameter as measured at intersection with blade leading edge: Cast 1.100 (27.94mm), billet 0.800” (20.3mm) Housing maximum bore diameter 3.084 (78.33mm). Wheel must protrude into this bore diameter minimum 0.25”. Compressor wheel contour must be continuous features from the inducer to the exducer (no “stepped” wheels). Ported shroud groove must intersect housing bore within 0.50” from the furthest intersection point to the compressor leading edge. Groove width 0.200” maximum. 3) Compressor cover inlet is permitted a maximum inlet diameter of 4.0 inches 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 “Non-Billet Wheel” Turbochargers: 55mm Twin Turbochargers are permitted on V6 and Small Block V8 up to a MAX of 377ci 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 2.165 inches (55mm) 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 2.500 inches (63.5mm) 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).
TIRES-REAR: M/T 235 Drag Radial (3752R) and (3450)
LIMITED 235 WEIGHT GUIDE
Base Weight (All weights are race-ready, car with driver)
4 Cly VW Air-Cooler W/Any Power Adder…………….2050 lbs
4 Cly – Rotary W/Any Single Power Adder…………….2250 lbs
V/6-I/6 W/Nitrous………………………………………….2700 lbs
V/6-I/6 W/Turbo or Blower……………………………….3000 lbs
Small Blocks N/A………………………………………….2600 lbs
Small Blocks W/Nitrous (up to 415ci)…………………….3150 lbs
Small Blocks W/Nitrous (416-434)………………………3250 lbs
Small Blocks W/Nitrous (435-444 Max)…………………3350 lbs
Small Blocks Supercharged (Level 1) ………………….3200 lbs
Small Blocks Supercharged (Level 2) ………………….3300 lbs
Small Blocks Supercharged (Level 3) ………………….3400 lbs
Small Blocks Supercharged (Level 4) …………………3500 lbs
Small Blocks Single Turbo up to 67mm ……………….3200 lbs (Cast or Billet Wheel No Inlet Restrictions)
Small Blocks Single Turbo (67.01 to 71mm)……………..3300 lbs (Cast Wheel no Inlet Restrictions)
Small Blocks Single Turbo (67.01 to 71mm)……………..3350 lbs (Billet Wheel 4” Reduced Inlet)
Small Blocks Single Turbo (67.01 to 71mm)……………..3400 (Billet Wheel No Inlet Restrictions)
Small Blocks Single Turbo (71.01 to 74mm MAX)……….3400 lbs (Cast Wheel no Inlet Restrictions)
Small Blocks Single Turbo (71.01 to 74mm MAX)……….3450 lbs (Billet Wheel 4” Reduced Inlet)
Small Blocks Single Turbo (71.01 to 74mm MAX)……….3500 lbs (Billet Wheel No Inlet Restrictions)
Small Blocks Single Turbo (74.01 to 76mm MAX)……….3500 lbs (Cast Wheel no Inlet Restrictions)
Small Blocks Single Turbo (74.01 to 76mm MAX)……….3575 lbs (Billet Wheel 4” Reduced Inlet)
Small Blocks Single Turbo (74.01 to 76mm MAX)……….3625 lbs (Billet Wheel No Inlet Restrictions)
Small Blocks Twin Turbo (Max 55mm Max 377ci)……….3500 lbs (No Billet Wheels permitted)
Big Blocks N/A (up to 472ci)………………………………..3000 lbs
Big Blocks N/A (473 up to 525ci)…………………………..3100 lbs
Big Blocks W/Nitrous (up to 472ci)……………………….3300 lbs
Big Blocks W/Nitrous (473ci to 515 Max)……………….3400 lbs
LIMITED 235 WEIGHT ADDS & DEDUCTS
Add 50 lbs. For Use of a 4500 Series Carb and/or 4500 Style Intake Manifold on NA Combo Add 50 lbs. For Use of a Cog Drive Belt on a Supercharger Combo Deduct 50 lbs. For Use of a “Blo-Thru” Carburetor on a Boosted Combo Deduct 25 lbs. For Air to Air Inter-Cooler on a Boosted Combo Deduct 50 lbs. For No Inter-Cooler of any-type on a Boosted Combo Deduct 100 lbs. For “310ci or less Boosted Small Blocks” (not including Mod Motor) Deduct 150 lbs. For “2-Valve Mod Motor” Combo’s
LIMITED 235 CYLINDER HEAD WEIGHT ADDS:
If you do not see your exact Head Listed, please email us the brand and part numbers for approval before coming to a race, if your Cylinder Head is not listed, you will not be legal to compete in Limited 235 email@example.com
Add 0 lbs.
Any OEM Factory Cast Iron/Aluminum Heads (This does not include GM Performance, Ford Racing or Mopar Performance Parts listings)
Small Block Ford: Edelbrock Performer Series & Victor Jr. # 77189 & 77199 / AFR 165, 185, 195 Series / World Products 180cc Windsor Jr / Ford Racing M-6049-Z304D
Small Block Chevy: AFR 180, 190, 195, 210, 220, 227 Series / Edelbrock Victor Jr 77589 / TEA SBC220-CUSTOM / Jegs PP 514032 /
Big Block Chevy: Brodix BB-2 X, BB-2 XTRA & BB-3 Series / Dart Pro-1-310, 325, 335 & 345 #’s 19100000, 19200000, 19300000 & 19474030 / Canfield 0902 6007 /
Small Block Mopar: Jegs PP 514202
Add 50 lbs.
Small Block Ford: Trick Flow TFS-51910002-M44, TFS-51700001, TFS-51710001-M64 / AFR 205 Series / Speedmaster PC3061 Small Block Chevy: Dart Pro-1 230 Series #’s11710040P, 11711143P, 11720040P, 11721143P, 11810040P, 11811143P, 11820040P & 11821143P, Chevrolet Performance 88958758, TFS-30610001
Add 100 lbs.
Small Block Ford: AFR 220 Series / Trick Flow TFS 52410003-M61 Small Block Chevy: AFR 235 Series, 245 #1138 Big Block Chevy: Dart Pro-1-355 19574030
Add 150 lbs.
Small Block Ford: Small Block Chevy: Brodix -10 BRO-1100002, Dart 220
Add 200 lbs.
Small Block Chevy: Pro-Filer 176X
Add 250 lbs.
Small Block Chevy: Allpro 23* #RR245sp-22 LS: Brodix 158-1173001
NOT LEGAL UNLESS NOTED FOR NA COMBO’S.
Small Block Ford: Edelbrock Victor SR 7721 (add 200lbs for NA) / Trick Flow Tfs-sb-188-2-1979, tfs-5171t016-C02
Big Block Ford: Trick Flow TFS-5451T802-M87
Small Block GM: Edelbrock Victor 18* Series (add 200lbs for NA) / GM Perf 10033867 / Brodix 10RI, 10X
Big Block Chevy: Profiler 174x-c35
If you do not see your exact Head Listed, please email us the brand and part numbers for approval before coming to a race firstname.lastname@example.org
Limited 235 REQUIRED CLASS DECALS: Decals will be available during Sign-Up at the SCSN Trailer
ATLAS PERFORMANCE LIMITED 235 REQUIRED CLASS DECALS
CLASS TITLE SPONSOR DECAL:
“Atlas Performance” decal must be installed on base of windshield on the Driver’s side. (Bottom right-hand side when looking at front of vehicle windshield)
CLASS PRESENTED BY SPONSOR DECAL:
“MagnaFuel” decal must be installed on base of windshield on the Passenger’s side. (Bottom left-hand side when looking at front of vehicle windshield) Decals will be available during registration at the PSCA Event Trailer
PSCA SERIES DECALS:
“PSCA” Decals must be placed on both left & right sides of race car on the 1/4 Window, 1/4 Panel or Side of Rear Wing in a highly visible location
PSCA CLASS SPONSOR DECALS:
“Ross Pistons” & “MandM Heating & Cooling” Decal must be placed on the rear 1/4 Window, 1/4 Panel or Side of Rear Wing in a highly visible location
All Decals will be available during registration at the PSCA Event Trailer during Sign-Up
CONTINGENCY PROGRAM & CONTINGENCY DECALS:
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 PSCA Event Trailer, but in the event the PSCA 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.
RACE DAY POLICIES
FIELD SIZE: Limited 235 will qualify with an “ALL–RUN FIELD”
ALTERNATING LANES DURING QUALIFYING: Each Limited 235 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.
ELIMINATION’S: Drivers will draw Poker Chips prior to each elimination round to determine pairings. #1 Qualifier will draw first, followed by the rest of the qualified field
LANE CHOICE DURING ELIMINATION’S: This will be determined on the Poker Chips that each driver will choose prior to each round
STARTING SYSTEM: 4-Tenths Pro Tree
AUTO-START: The Auto-Start System will be turned on with a 7-sec timeout
BYE-RUNS: Each racer can only receive one “Bye–Run” during the pairings draw (This does not include if you draw a racer that is broke or cannot make the call to lanes) All vehicles must still take the tree during any single run
SCALES: After each qualifying and elimination pass, all cars must stop and weigh at the track scales. If you lose in eliminations, and your opponent fails to make weight you will be reinstated into the eliminations only if you made minimum weight requirements. If both cars failed to make minimum weight, both cars will be disqualified. It is the driver’s responsibility to verify with each track scale, the weight of his/her car prior to each race day. There will 5lb error factor allowed.
Once Your Vehicle Passes Tech Inspection, There Are No Refunds
$750.00 / To Win
$300.00 / Runner-up
$125.00 / Semi’s
CLASS ENTRY FEE: $75 Paid at the PSCA Event Trailer & $25 TRACK/NHRA TECH CARD AT TICKET BOOTH WHEN ENTERING BANDIMERE
2020 LIMITED 235 CHAMPION / MEG RAMSEY