upcoming races
Las Vegas
St. Louis

LAS VEGAS // November 16-19 2017

ST. LOUIS // August 2-4 2018

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class rules / LAS VEGAS
Precision Turbo Pro Modified presented by ENERGY MFG.

Class Description

 

Precision Turbo Pro Modified presented by Energy Manufacturing will run on a 1/4 mile format with a 32-car Qualified field with Alternates.

 

The SCSN follows NHRA Advanced ET Rules - Refer to the NHRA rulebook.

 

REQUIREMENTS AND SPECIFICATIONS...

BODY: Funny car or one piece bodies not allowed even if equipped with doors. Maximum front end overhang of 45” as measured from centerline of front spindles. An SCSN accepted extension may be used to create 45” overhang if the front end overhang of the original body is less than 45”. All bodies must originate from a documented production vehicle. All new cars must be accepted by the SCSN Technical Services Department prior to construction.

 

DOORS: Required. Doors must be functional and able to be opened from both the inside and outside of the vehicle. Doors may be fabricated from carbon fiber, fiberglass or metal.

 

FIREWALL: All firewalls must be made of steel or titanium (.024 minimum thickness). Magnesium, aluminum or composite not allowed.

 

FLOORS: Replacing stock floors with .024″ steel, .032″ aluminum allowed. Driver’s side floor pan must be .024″ steel and must extend from firewall to rear of drivers seat and be welded in.

 

TAIL LIGHT: Functional rear tail light is required. Minimum of 1 tail light is required to be operational and controlled from the drivers compartment.

CHASSIS

 

BATTERY: Maximum of two batteries allowed. All batteries must be securely fastened using metal fasteners. Batteries (including battery box) must weigh less than 100 lbs. Must have an external master mechanical electrical disconnect at the rear or vehicle marked “PUSH OFF”.

 

BRAKES: Four wheel brakes with dual master cylinder mounted above frame rails required. Application of brakes must be a function of the driver. Steel brake lines required and must be routed away from the flywheel and driveline area. One line-loc system with one activation source permitted on front wheels only.

 

DRIVER LOCATION: Must be in conventional left hand drive location.

 

 

CLASS SPONSOR DECAL:

"Precision Turbo" decal must be installed on base of windshield on the passenger side. (Bottom left hand side when looking at front of vehicle windshield) or on both lower front fenders forward of the wheel opening

 

CLASS PRESENTED BY SPONSOR DECAL:

"ENERGY" decal must be installed on base of windshield on the drivers side. (Bottom right hand side when looking at front of vehicle windshield) Decals will be available during registration at the SCSN Event Trailer

 

SCSN SERIES DECALS:

SCSN 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

 

SCSN SERIES SPONSOR DECAL:

Extreme Racing Oil & 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 SCSN Event Trailer

 

 

GROUND CLEARANCE: Minimum of 3” required from front of car to 12” behind front axle centerline, 2” minimum for remainder of car.

 

SUSPENSION: Race car type suspension required. Solid suspension prohibited. Shock absorbers required for all four wheels. Lockup shocks prohibited. Active suspension of any kind prohibited. Any ability to make on-track setting/rate changes based on “real time” data or input from any source is prohibited. Electrically or pneumatically controlled, hydraulic shocks and/or struts are permitted, provided all adjustment settings/changes are preset before the run. Only 1 three-wire shielded cable connection is permitted from the top of the shock/strut to the shock/strut controller. Electrical connections of any other kind to or from the shock/strut prohibited. Shock/strut travel sensors permitted, but may ONLY be connected to the vehicle data recorder. Shock/strut control boxes that have connections for travel sensors must have the pin removed from the connector. Connection to serial port on control box prohibited once car reaches the ready line. All wiring must be visible and easily traceable.

 

TIRES: Slicks permitted. Must be automotive type tires designed specifically for racing. Tires cannot be located outside of bodyline. All tires must have manufacturer, model and or part number and size information must be clearly and permanently designated on sidewall. Maximum height of front tire is 25”.

 

WHEEL BASE: Maximum 115″. S-10, Ranger, Dakota Maximum 125″. Full size trucks Maximum 140”. Maximum variation is 2” side to side.

 

WHEELS: Wheels meeting SFI Spec. 15.1 or 15.3 mandatory. Inner liners accepted. Maximum rear wheel width 16” measured between the inner and outer tire mounting surfaces. Use of a liner mandatory on all non bead lock wheels.

 

DRIVELINE AND ENGINE

CLUTCH/FLYWHEEL: Flywheel and clutch meeting SFI Spec. 1.3, 1.4, or 1.5 certification required. Three discs maximum with a maximum disc diameter of 11 “ or four discs maximum with a maximum disc diameter of 8 “. Flywheel shield meeting SFI Spec 6.2 or 6.3 required. Maximum depth of flywheel shield: 9.400 “. Clutch must be manually operated by driver’s foot: electronics, pneumatics, hydraulics, or any other device may in no way affect the clutch system. Throwout bearing must release all fingers, levers, stages, etc. simultaneously. Staged or variable release clutches of any description prohibited.

 

CYLINDER HEADS: Hemi, canted-valve, or wedge heads permitted. Billet heads permitted. Maximum one spark plug per cylinder.

 

ENGINE CONTAINMENT SYSTEM: SFI Spec. 7.1 lower engine containment system required. If a flexible 7.1 system is utilized, it must be supported by a belly pan made from carbon fiber or .032” aluminum with a minimum 2” vertical lip.

 

MAXIMUM CUBIC INCH ENGINE DISPLACEMENT: 526 cubic inch maximum for Supercharged cars, 526 cubic inch maximum for Turbocharged entries 910 cubic inches (At different min weights) for Nitrous powered entries and unlimited CI for NA entries. All rules subject to change at the sole discretion of the SCSN Technical Services Department.

 

ENGINE SETBACK: Maximum of 10% of total vehicle wheel base as measured from the centerline of the forward front spindle to center of front spark plug hole.

 

EXHAUST: Exhaust gasses must be directed out of the body and away from the driver and fuel system.

 

FUEL: Alcohol, gasoline and methanol allowed. The use of nitro-methane and/or propylene oxide is strictly prohibited.

 

NITROUS OXIDE: Prohibited on Turbo and Supercharged entries. Water injection permitted on Nitrous entries only, only water permitted in water injection system.

 

SUPERCHARGER:  Hi-helix or standard helix Roots type supercharger only. Manifold burst panel meeting SFI Spec 23.1 plus restraint system meeting SFI Spec 14.2, including injector restraint straps mandatory. Intercoolers, variable multi-speed supercharger devices prohibited. The top opening may not exceed 12 “ in length or 5 “ in width. The entire inlet opening must be on/in the upper surface only. The maximum length from the front of the supercharger drive pulley to the leading edge of the rotor is 15 “. Offset drive pulleys, spacers, modified cases, or attaching methods may not be used to add to the 15” maximum. The rotors must be driven from the front (both the external drive and the internal gearing. Any inlet/outlet cavity in front of the rotors is restricted to a maximum of 3.000 “ measuring from the face of the bearing plate to the front of the cavity. Roots Type: Maximum size: 14-71, 22 1/4-inch case length, 11- ¼” case width, 19” rotor length; maximum rotor diameter:5.840 “ including fixed stripping. The case must be one piece with removable front and rear bearing end plates; rotor must be contained within one-piece case. Roots-type high helix: Must adhere to same maximum case dimensions and maximum rotor cavity diameter as standard Roots. Rotor helix angle may not exceed 6.5 degrees per inch (123.5 degrees total over 19” maximum rotor length). Screw-type supercharger legal but has limitations (See weight section below).

 

THROTTLE: Throttle control must be manually operated by driver’s foot. Electronics, pneumatics, or hydraulics is permitted for starting line/staging rpm limiters only.

 

TURBOCHARGER: Twin turbochargers limited to 88mm. Turbocharger size will be verified by measuring the housing bore at the leading edge of the impeller wheel. 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.

 

MISCELLANEOUS

STARTING LINE ENGINE CONTROL DEVICES: Allowed.

 

SAFETY EQUIPMENT

DRIVER RESTRAINT SYSTEM: SFI Spec. 16.1 certification required. 7 point system recommended

 

ENGINE CONTAINMENT SYSTEM: NHRA accepted lower engine containment system required. The system must include the oil pump and related components and be a minimum of 3” above ground.

 

FIRE SYSTEM: SFI Spec. 17.1 system required. System must contain a minimum of 20 lbs of fluid or gas fire suppression agent. One nozzle required inside driver’s compartment must be directed at driver’s feet. Two or more nozzles must be directed at front of engine and fuel cell. All fire suppression must be released with a single actuation. (i.e. single handle, button or lever)

 

HEAD AND NECK RESTRAINT: SFI Spec. 38.1 required. An aluminum skid plate located above driver’s head is recommended.

 

MASTER ELECTRICAL CUTOFF: Required. Must be clearly labeled “PUSH OFF”.

 

PARACHUTES: Dual parachutes required. Separate shroud-line mounting points with 1/2” sleeved grade 8 bolts required.

 

PROTECTIVE CLOTHING: A driver’s suit meeting SFI Spec. 3.2A/15, gloves meeting SFI Spec. 3.3/15, shoes meeting SFI Spec. 3.3/15 required for Nitrous and Gasoline burning Turbocharged entries. A driver’s suit meeting SFI Spec. 3.2A/20, gloves meeting SFI 3.3/20, shoes meeting SFI Spec. 3.3/20 required for Supercharged and Methanol burning Turbocharged entries. A head sock meeting SFI Spec. 3.3 is required unless a helmet manufactured with a skirt meeting SFI Spec. 3.3 is used.

 

TRANSMISSION: All transmissions must be covered by a one piece SFI Spec. 4.1 restraint.

 

WINDOW NET: SFI Spec.27.1 required.

 

MINIMUM WEIGHTS:

NATURALLY ASPIRATED:

No Minimum

 

NITROUS:

2300 pounds for Nitrous entries (911-960ci Max)

2200 pounds for Nitrous entries (866-910ci)

2100 pounds for Nitrous entries (up to 865ci)

 

ROOTS SUPERCHARGED:

2400 pounds for Supercharged entries (up to 14.55% OD / up to 526ci Max)

2450 pounds for Supercharged entries (over14.55% OD to Max 29% OD / up to 526ci Max)

2450 pounds for Supercharged entries (Max 29% OD up to 455ci)

 

SCREW BLOWER:

C - 2500 lbs 92% max overdrive

D - 2550 lbs 108% max overdrive

 

CENTRIFUGAL SUPERCHARGED:

2300 pounds for Centrifugal Supercharged entries (Small Blocks)

2400 pounds for Centrifugal Supercharged entries (Big Blocks)

 

TURBOCHARGED BIG BLOCK:

2400 pounds for Single Turbocharged entries

2650 pounds for Twin Turbocharged entries (88mm Max)

 

TURBOCHARGED SMALL BLOCK:

2200 pounds for Single Turbocharged entries

2350 pounds for Twin Turbocharged entries (88mm Max)

2200 pounds for Twin Turbocharged Modular entries (88mm Max)

 

Deducts: 75lbs for use of a Torque Converter in Small Block Applications Only

 

SCSN Las Vegas Required Decals:

Class Sponsor Decal

"Precision Turbo" decal must be installed on base of windshield on the passenger side or on both lower front fenders forward of the wheel opening

 

Event Sponsor Decal

"LJRC" decal must be installed on base of windshield on the drivers side.

(Bottom right hand side when looking at front of vehicle windshield) Decals will be available during registration at the SCSN Event Trailer

 

SCSN Series Decals:

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

 

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 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.

 

RACE DAY POLICY'S

Field Size and Ladder:

Pro Modified will qualify for a 32-car field (with Alternates) and will be put on a 32-car Pro Ladder. If less than 32 cars enter, we will follow the NHRA "Official Ladder" for the field size....

 

Alternates:

If there are more than 32 cars qualifying for the 32-car field, we will start inserting alternates (To replace broken qualified cars) starting at spot 33 and so on... If you are an alternate, and a spot opens up, you will be inserted in the 1st available position before the drivers meeting on Sunday morning. This will give the qualified cars overnight to get the cars repaired.

 

TOW BACK & TOW VEHICLES:

All Pro Modified entries are allowed to 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 Pro Modified 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

 

BYE-RUNS:

All vehicles must take the tree, and run down the 1/4 mile

Once Your Vehicle Passes Tech Inspection, There Are No Refunds!!!

 

PAYOUTS:

$15,000 / To Win

$1,500 / Runner-up

$500 / Semi's

$250 / Quarters

Class Entry Fee: $300 (Plus $80 Track Tech Card)

 

2016 Winner Mike Bowman

 

2016 Winner Mike Bowman

QUESTIONS??

 

Heather Roth: Event Coordinator

heather@streetcarsupernationals.com

Call/Text 1-702-701-6464

 

Mel Roth: President

mel@pscaracing.com

Call/Text 1-661-917-3078