2019 Hobby Stock Rules
The 2018 rules for the Madera Hobby Stocks; Note, there are three different car packages you can operate under, this allows a wide range of cars to be competitive in this fun series.
Package (A) - Cars operating under the package (A) will meet the following requirements;
Weight - 3,200lbs prior to qualifying and any race. Stock chassis with stock suspension is 55% maximum left side weight. Stock front clip and stock front suspension with fabricated center frame and rear clip with leaf springs is 55% maximum left side weight. (Note, rear leaf springs only on all fabricated frames).
Engines- (A) cars will run a factory stock 602 crate engine, (A) cars must run an MSD rev limiter and will be required to run a track provided 6,000 rev chip at all times.
Engine set back – (A) The engine set-back rule is 0" back (straight up) at the center of the forward most spark plug hole to the center of the upper ball joint on the same side.
Body - (A) Bodies may be made of steel, aluminum or fiberglass, bodies are to be as stock appearing as possible. Bodies must have complete nose and tail coverings. No wedge style bodies. No rear window or rear spoiler allowed.
Suspension - (A) cars may run aftermarket upper A-Arms and bite bolts, but must run stock front suspension for make and model other than upper A-Arms. May use OEM replacement center link. (A) cars may run a single piece adjustable sway bar. No three piece sway bars allowed. Rear suspension will be stock for make if the car has a stock frame. (Note, rear leaf springs only on all fabricated frames).
Package (B) - Cars operating under the package (B) will meet the following requirements;
Weight - 3,350lbs prior to qualifying and any race. Stock chassis with stock suspension is 53% maximum left side weight. Stock front clip and front suspension with fabricated center and rear clip with leaf springs is 53% maximum left side weight. (Note, rear leaf springs only on all fabricated frames.)
Engines- (B) cars may run any normally aspirated engines, engine block and cylinder head must be cast iron. All engines must be wet sump, and may be any cubic inch. Must have flat tappet cam. (B) car carburetors must be 4412 or equivalent 500 cfm. Must fit Go-No-Go Gauges for 4412. Choke cannot be removed.
Engine set back – (B) The engine set-back rule is 0" back (straight up) at the center of the forward most spark plug hole to the center of the upper ball joint on the same side.
Body - (B) Bodies may be made of steel, aluminum or fiberglass, bodies are to be as stock appearing as possible. Bodies must have complete nose and tail coverings. No wedge style bodies. No rear window or rear spoiler allowed.
Suspension - (B) cars may run aftermarket upper A-Arms and bite bolts, but must run stock front suspension for make and model other than upper A-Arms. May use OEM replacement center link .(B) cars may run a single piece adjustable sway bar. No three piece sway bars allowed. Rear suspension will be stock for make if the car has a stock frame. (Note, rear leaf springs only on all fabricated frames).
Cars operating under package C must meet the following requirements;
Weight - 3,100 pounds prior to qualifying and any race. No left side weight rule for package "C"
Engines- (C) cars may run any normally aspirated engines, engine block and cylinder head must be cast iron. All engines must be wet sump, and may be any cubic inch. Must use flat tappet camshaft. (C) cars may run any single carburetor, again, any size four barrel or two barrel. 602 engines used in package “C” will be treated as open engines with no rpm limit.
Engine set back – (C) The engine set-back rule is a maximum of 3.5” back at the center of the forward most spark plug hole to the center of the upper ball joint on the same side. Note, you may not alter the stock fire wall in order to move your engine back.
Body - (C) cars must run a Stock Body, all body panels must be factory stock including hood, fenders, doors, quarter panels, trunk, rood, hood, floor pan, front firewall, rear firewall, etc. “C” cars may run a rear window and a 5” tall spoiler that is up to 60” wide.
Suspension - (C) cars may run aftermarket upper A-Arms and bite bolts, but must run stock front suspension for make and model other than upper A-Arms. May use OEM replacement center link. (C) cars may run a single piece adjustable sway bar. No three piece sway bars allowed. (C) cars must run the factory rear suspension their cars came from the factory with.
Brakes - (C ) cars must run factory stock brake pedal assembly with no brake balance bar allowed.
Frames - (C) cars must be factory stock frames, NO Fabricated frames allowed whatsoever on (C ) cars. Frame connectors ok on sub-frame cars for roll cage and safety purposes.
Stock Sheet Metal - (C) cars must have a complete stock floor pan and stock front and rear firewall with no exceptions. Trunk area may have the stock sheet metal removed to make room for a fuel cell.
Common rules that apply to all three packages, package A, B, and C
Roll Cage - All cars must have a full roll cage built from a minimum 1 ¾ x .095 round tubing, and must have a complete set of driver side door bars and at least and "X" in the passenger side.
Wheels & Tires - Wheels must be 8" or less, and must be steel. Tires must be the Hoosier 8.0-15/970 treaded tire. All tires must be purchased from the track. Tires MUST NOT be cut, soaked or modified in any manner at all. Used tires that were purchased from the Madera Speedway are ok to use.
Ride Height – 4” minimum ride height on all frame and body parts.
Fuel - All cars must run Sunoco 110 Purple track fuel or 91 octane Chevron fuel.
TRANSMISSION - May only be STANDARD 3 OR 4 SPEED, OR AUTOMATIC 2 OR 3 SPEED. Must be O.E.M. Manual transmission must use O.E.M. or O.E.M. REPLACEMENT SINGLE DISC CLUTCH. Automatic transmission must use O.E.M. or O.E.M. REPLACEMENT TORQUE CONVERTER. NO RACING OR HIGH PERFORMANCE CLUTCHES OR TORQUE CONVERTERS ALLOWED. A. All gears must be in stock working order. Transmission must be able to go into gear with engine running and car sitting still. B. All standard transmissions must have a S.E.M.A./NASCAR approved STEEL bell housing. Automatics must have a S.E.M.A. approved ring gear shield or a tech inspector approved 1/8" steel plate inside the car on the transmission tunnel part of the floorboard. No aluminum flywheels or drive lines.
REARENDS - No quick change rear ends allowed. All drive shafts must be steel.
TRACK WIDTH & Wheel Base - All competing cars will not exceed 78" inch track width, it will be measured from the bulge outside to outside of the front tires at the spindle height. Minimum wheel base is 108". Minimum wheel base is 108" for package "A" and "B". Package "C" must run the stock wheel base the car came with.
EXHAUST SYSTEM - Stock O.E.M. cast iron exhaust manifolds, Center dumps are allowed, or Single flange tube type bottom dump headers allowed. No wrap around, step, or 180 headers allowed. Any muffler may be used provided maximum sound level 95 db at 100'. Maximum 2.5" pipe, dual exhaust OK. No flex pipe. Exhaust must extend behind the driver's seat, with no exhaust of any kind inside the car. Any size outlet OK. Exhaust must be securely attached to the bottom of the car. Loss of any part of exhaust system on or off track will be cause for Black Flag.
Non-conforming exhaust system (75 pound weight penalty) there is also a 53% maximum left side weight rule for any car carrying a weight penalty. All cars must meet the 95db at 100’.
Rear Window and Rear Spoiler – No rear window and spoiler of any kind may be used on A and B package cars.
SHOCKS - Any steel nonadjustable shock, all parts must be steel. Aluminum rod end on shaft end ok. NO bump stops or coil overs.
BRAKES - Only single piston OEM style brake calipers allowed. Only OEM brake rotors allowed.
Steering & Spindles – OEM stock spindles only, No rack and Pinon unless factory for make and model on package “C” and mounted in factory location. OEM style center link only. No three piece sway bars.
A-Arms - Stock OEM lower control mounts and lower control A-Arms only. Aftermarket upper A-Arms and mounts are ok.
The following infractions will result in a firm penalty which could include a LIFETIME ban from the series.
A. Being caught with traction control.
B. Bypassing the RPM limiting control device in any way.
C. Altering the 602 crate engine under the seals in any way that is non OEM. (you may run aftermarket valve springs but they must be the same spring pressures as OEM, you may run any carburetor, you may run an aftermarket OEM replacement distributer, you must run a mechanical fuel pump in the stock location, and you must run the stock oil pan and stock harmonic balancer).
D. Altering the Hoosier 970 tire, such as soaking the tire, or cutting the tire. Tires be a stock 970 tire.
E. If you are caught cheating the fuel in any way, the Sunoco fuel and the Chevron 91 octane fuel must be stock, and must not have ANY additives whatsoever.
Illegal components will be confiscated by Madera Speedway and become property of the speedway.
Madera Speedway Race Procedures
" Start and Restarts: All Starts and restarts will be double file unless we deem it necessary to go single file. The Leader may choose the outside or inside line after the initial start of the race. Start line is at the cone located in turn 4. Once the lights are out, you must line up double file with the Leader a fender ahead of the second place car. Keep a reasonable pace to the Start Cone. Roll into the throttle at the vicinity of the cone and watch the Flagman for the Green Flag. No brake checking. No Passing/Pulling out of line prior to reaching the Start/Finish line. The front row will be given 2 attempts to start or restart the race. If they fail to, they will be penalized to the second row. The criteria for the start that the flagman is looking for is as follows; 1- The leader has set a reasonable pace. 2- The leader has a slight lead. 3- The leader initiates the start in the vicinity of the start cone/line.
" Caution Flag Procedures: When the Caution Flag is displayed, you are to slow down in a safe manner and proceed with caution back to the start /finish line single file. No Racing or Passing. Violators are subject to penalty. Your restart position will be the position you were in the previous completed lap unless you are deemed to be involved in the incident that brought out or led to the yellow flag being displayed. If you are involved in causing a caution flag you will be sent to the rear of the field. If you stop on track or fail to keep pace during the caution flag, and were not involved with an incident, you will be placed in the position where you blend back in to the field. Caution Flag laps may be counted if we deem necessary.
" Rough Driving: Rough driving will not be tolerated as well as any retaliation. If you are deemed to be the cause of an incident or involved, you will be placed to the very rear of the Field unless the other competitor involved was deemed to be Blocking. Depending on the incident, you may be parked, issued a fine, and penalized.
" Hot Pits: If you enter the Pits for any reason you will restart at the rear of the Field, just in front of any Lucky Dog cars.
" Lap Down Cars: All lap down cars will be moved to the rear on all restarts. There will be a Lucky Dog on every yellow flag giving one driver the least amount of laps down, one lap back and putting them to the very rear of the field unless the eligible car was involved in the yellow flag incident.
" Blue Flag; Blue flag means move over the leadings our coming. Follow the Flagman's direction and move to the high side if possible. Make sure you hold your line. Use hand signals to notify them of your intentions
" Black Flag: Black flag pointed at you is a warning in regards to your actions on the track. If it is displayed, you must go to the pits within 3 laps
" Red Flag: Red flag means stop in a safe manner and follow Track Officials directions. Cars in the Hot Pits may be worked on.
Safety will be firmly enforced, make sure your equipment is up to speed. Charged Fire System Mandatory. Head and Neck Restraint System mandatory. Belts, window net, and Helmets must be SA 2005 or newer. All Drivers must wear SFI rated suit, gloves, and shoes. SFI undergarments are recommended.
All cars must run a transponder mounted 12" behind the rear axle.