Atlas Performance Limited 235
Presented by Ross Racing Pistons

Ross Racing Pistons 235 Limited 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)

235 Limited 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.

LETTERING / DECALS:
235 Limited Class sponsor decal (Atlas Performance) must be placed in the lower passenger corner of the front windshield. PSCA Decals must be placed on both left & right sides of race car on the rear 1/4 Panel or wing in a highly visible location.

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 area

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, 6769 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 pscamobile@gmail.com and include, manufacturer & part number

REAR SUSPENSION:
After-Market Control Arms, Bushings, Shocks, Leaf Springs, Torque Arm & Coil Springs are OK to upgrade as long as 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.

DRIVE TRAIN

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 – 410ci 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 is limited to the use of a single drive-line sensor that is capable of measuring RPM and/or Wheel Speed. Sensor wiring must be clearly identified and easily traceable from sensor connection to Data Acquisition system. Sensor cannot be spliced or have any jumpers installed under any circumstances. RPM sensor CANNOT be routed into any Engine Management/Timing Management system, be it via direct or indirect connection. 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 SCSN Events (Including Street Car Super Nationals St Louis & RMSS) for the period of 13-Months. In addition a Donation of $1,000.00 must be made to a SCSN Charity (St Judes Children Hospital) before Car & Driver are Re- instated.

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 pscamobile@gmail.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’re not sure, please email us at pscamobile@gmail.com 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’re not sure what a “REAL MUFFLER” is (at least 6′′ of the muffler “Main Body” is required) email us at pscamobile@gmail.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 mel@racepsca.com

POWER ADDERS

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:
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 to Solenoid is permitted
*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)

SUPERCHARGER-SMALL BLOCK ONLY:
10-Rib Max Belt (Cog Belt ok by adding 100lbs, 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 a maximum size
of 2.99251 inches (76mm) 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 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 100 lbs. For Use of A 4500 Series Carb and/or 4500 Style Intake Manifold on NA Combo
Add 100 lbs. For Use of A Cog Drive Belt on a Supercharger Combo
Deduct 50 lbs. For Use of A “BloThru” 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 mel@racepsca.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
Big Block Chevy:

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
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 mel@racepsca.com

ATLAS PERFORMANCE 235 LIMITED 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:
“” 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” & “Unlimited Products” 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 “ALLRUN 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 “ByeRun” during the pairings draw (This does not include if you draw a racer that is broke or can’t 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

PAYOUTS:
$500.00 / To Win
$250.00 / Runner-up
$125.00 / Semi’s
$50 / Quarter’s Presented by BowTie Engine Shop

CLASS ENTRY FEE:
$75 Paid at the PSCA Event Trailer & $25 TRACK/NHRA TECH CARD AT TICKET BOOTH WHEN ENTERING BANDIMERE