upcoming races
Las Vegas
St. Louis

LAS VEGAS // November 21-24 2019

ST. LOUIS // August 1-3 2019


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

Precision Turbo Pro Modified presented by Energy Manufacturing will run 1/4-mile and qualify for a 32-car field (with Alternates) and be put on a 32-car Pro Ladder.....Unless fewer than 32 cars qualify, then we will follow the NHRA "Official Ladder" for that field size....


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



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.


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


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.



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 960 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.


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- 1⁄4” 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).


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.




No Minimum



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

2200 pounds for Nitrous entries (866-910ci)

2100 pounds for Nitrous entries (up to 865ci)



2350 pounds for Supercharged entries (up to 526ci Max)



C ROTOR - 2450 lbs Up to 92% Overdrive

C ROTOR - 2525 lbs Up to 98% Overdrive

C ROTOR - 2650 lbs Up to 108% Max Overdrive D ROTOR - 2550 lbs 108% Max Overdrive



2300 pounds for Centrifugal Supercharged entries (Small Blocks) 2400 pounds for Centrifugal Supercharged entries (Big Blocks)



2400 pounds for Single Turbocharged entries

2650 pounds for Twin Turbocharged entries (88mm Max)

2950 pounds for Twin Turbocharged entries (98mm Max)



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 Deducts: 100lbs for Pontiac Based Engines


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



"ENERGY" decal must be installed on base of windshield on the driver’s side.

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



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



"Unlimited Products, FuelTech & N20" Decals must be placed on the rear 1/4 Window, 1/4 Panel or Side of Rear Wing in a highly visible location



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.






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 qualified field size....



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.



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, 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.



All Pro Modified 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 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.



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



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

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



$20,000 / To Win

$1,500 / Runner-up

$500 / Semi's

$250 / Quarters

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


2016 & 2017 Winner Mike Bowman




Heather Roth: Event Coordinator


Call/Text 1-702-701-6464


Mel Roth: President


Call/Text 1-661-917-3078