This year we are offering a Farm Stock class at the 2025 Midwest Winter Nationals. Below are the rules for the clubs that are competing in the class. Hopefully your tractor fits one of these versions. If not at the bottom is a general version that should answer your questions. If you still have questions, feel free to reach out to me at 309-712-1406. I will do my best to answer your question.

 

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Illini State Pullers: 2Hot 2Farm Rules: 
Revised for the 2025 Midwest Winter Nationals
 

1. Engine: 480 cubic inch maximum (zero tolerance). De cubing allowed.

 

1. OEM cylinder heads for model or series of engine only, maximum of 2 valves per cylinder. Re-cast heads not allowed.

2. OEM replacement blocks allowed; must have stock engine-mounting plate that is made for the replacement motor and looks stock.

3.  Manifolds: OEM stock intake and exhaust manifolds for the model or series of engine permitted. Single air inlet only. Up to 1” intake manifold spacer allowed. Modifications to manifold for intake plumbing adaptation allowed. No precooling or after-cooling of intake air allowed. No ice filled or ice cooled devices of any kind onboard the tractor. All engine air must enter the inlet of the turbo at ambient air temperature and humidity. Inlet air must not be drawn through or across any cooling device.

4. Fuel Pumps: Up to P7100 series injection pumps with a maximum of 13mm plunger, or stock-appearing pump for make and model of tractor. No Sigma pumps. Only one plunger per cylinder.

5.  Turbo: Out-of-the-box Borg-Warner SX-E 362 (new part number 13009097053). No modifications to the turbo of any kind are allowed, other than external modifications to intake or exhaust housings, strictly for adaptation to intake and exhaust plumbing. The following exhaust housings are allowed: AR ratios of 0.88 - #177211, 0.91 - #177208, or 1.00 - #179905.

6.  Water Injection: Maximum of 2 ports in crossover pipe only. Competitors must use specified pre-mixed water purchased from Whatssmokin Promotions.

7.  RPM Limit: 3000 rpm maximum, as monitored from sled, or random spot check. (See Disqualification section) Tractor must be equipped with ISSPRO #R8906, 2-wire speed sensor with single magnet mounted to speed target (one pulse per engine revolution). Wire harness must be in full view and be connected (without splices) to a standard 110V female, grounded receptacle located in similar position as kill switch connection with clear access for sled hook-up.

8.  Tires: 20.8 x 38 or 18.4 x 42 maximum. Cut tires allowed at Midwest Winter Nationals. Any rim width or wheel style allowed.

9. . Weight: 11,000 lb.

10. Chassis: Maximum wheelbase of 114 inches, and maximum length of                                                   13 feet from the center of the rear axle to forward most point of tractor (excluding tow hook). Any non-factory fabricated front axle is required to have stabilizer bars (ski bars) that can support the weight of the tractor.

11. Minimum drawbar length is 18 inches from the center of the rear axle to the point of hook.

12. Maximum hitch height is 20 inches at hook point. (Hitch device must be no less than 1 inch thick. Must have 3 inches wide by 3 ¾ inches long opening parallel with the ground.), pulling point may not be more than 1 ½ inch from back edge of hitch. Hitch must be clearly accessible, frame mounted, rigid in all directions, and shall be constructed so that in the event of breakage, the drawbar supports do not pull from a top link or brace above the center of the rear axle.

13. Factory style ROPS or roll-cage required

14. Fuel: Diesel fuel only as a primary fuel. Blended fuels and biodiesel allowed. All fuel must read below 150 on the fuel test and not light with a candle lighter.

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Southwest Wisconsin Altered Farm Rules:

Revised for 2025 Midwest Winter Nationals

 

General Rules:

1) Weight: 11,000 lbs.

2) No Speed Limit

3) 3000 RPM limit

4) 20.8x38 tire maximum, cut tires allowed

 

Safety Rules:

1) RPM plug in sensor for RPM sled box FVP P/N: 3316 Required

2) Cross bolts in exhaust must follow updated 2024 rules

3) Wheelie bars extending past rear tire required - Must be a maximum of 10" from ground

4) Fenders and/or floorboards supporting weight of driver required

5) Kill switch mounted at rear of vehicle required

6) Must have positive stop on injection pump for high idle

7) Dead man throttle required

8) No Injectables allowed

9) Front Ski Bars required, Front axle support to be made of 2.00” X .095 tubing or 2.00” X .120 mild steel tubing or same material as tractor frame rails. Front axle supports should connect to each frame rail in-line and extend towards front of tractor. Front skid/ front axle support should have radius to prevent digging into track. Front axle support frame should be strong enough to support front end weight of tractor. Support should have a maximum of 4” ground clearance.

 

10) Tie bars mounted to rear axle and extending forward of the flywheel mounted to frame.

 

11) Fuel shutoff controlled from seat of tractor required

 

12) All inline turbocharged engines are required to have a cable(s) placed between first and second cylinder through exhaust manifold port area. Cable must be a minimum of one (1) 3/8 manufactured pendant line with a rating of at least 3000 pounds or more with a tag from the manufacturer that indicates rated load capacity with swaged sockets. Or Two (2) 3/8" cables with a minimum of 4 clamps at the splice or crimps with a coupler on each cable. Cable(s) must circle the entire head /block assembly with a maximum of 4" of slack.

 

13) Electric TA's allowed

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Engine:

1) Side shields required

2) 505 cubic inch limit

3) 1 inch intake manifold spacer allowed

4) No intercoolers or cooling devices allowed

5) Water injection allowed, water only, Maximum of 2 ports in crossover pipe only

6) Diesel Fuel only

7) Turbo must be under hood and exhaust exit upward

8) Maximum of 3.25" crossover pipe diameter allowed

9) Maximum of 13mm P7100

10) Maximum of S362SX-E 2.42" 61.44mm P/N 13009097053 out of the box turbo

11) OEM Motor and Block. Block is not to be altered in any way externally for mounting of fuel injection pumps and remain in stock location. Internal webbing and water jacket to remain intact with provisions to re-bore block

12) Must have OEM cylinder head, intake manifold and exhaust manifold for that model or series tractor. No filler heads, single feed intake manifolds only. No headers or custom intake manifolds.

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Hitch:

1) 20” max drawbar height

2) 18" minimum from center of rear axle to end of drawbar

Chassis:

1) Roll Cage with harness or OEM ROPS with lap belt required

2) Must have weld on hubs for pressed steel, no cast centers

3) OEM ag rear end

4) Wheelbase is a maximum of 114 inches unless produced by manufacturer, Maximum of 13 feet from the center of the rear axle to the forward most part

5) Working brakes required

6) OEM Transmission must be stock appearing. No aftermarket gear boxes.

7) Clutch housing, transmission case, rear end housing must be OEM or equivalent

8) Custom Frames and tube chassis are allowed.

 

Backroads Pullers Inc. 11,000 lb. IMPROVED FARM Stock

 

1. 3000 RPM limit.

2. S362(Borg Warner P/N 13009097053) is the only turbo that is legal for competition. All turbos must be purchased and sealed by Ed Guenther at Guenther Heritage Diesel in Walnut, IL. 3. Water injection is allowed. Two nozzles located in cross over tube.

Water must be supplied by Whatssmokin Promotions

4. No Intercoolers or Aftercoolers.

5. 18.4x42 and 20.8x38 max tire size. Top Cuts allowed. No Full Cut tires allowed.

6. 20" max draw bar height, 18" from the center of rear axle.

7. All must tractors must run a speed sensor (ISSPRO R8906) to female 110v outlet at rear of tractor. If sensors fail to work, the competitor will not be allowed to hook for the rest of the event, unless the competitor can correct the issue.

8. 466 cubic inch limit. Case tractors will be allowed 504 cubic inches. All engines will be checked to verify the engine's size. Once the engine has been checked, a Back Road's Official will seal the oil pan.

9. Bosch A pump max.

10. No tube chassis.

11.Wheelie bars and air shut off are mandatory. Wheelie bars must not be connected solely to the hitch.

12.All tractors must weigh 11,000 lbs. max, depending on the class.

13.ROPS required. ROPS must be able to support the weight of the tractor in the event of a roll over. Drivers of tractors equipped with ROPS must wear a seat belt while hooked to the sled. 14. OEM cylinder heads only. No recast heads.

15.All tractors must have two 3/8" grade 5 bolts at a 90 degree angle located in exhaust pipe. 16. Fire extinguisher on tractor/vehicle required.

17.All tractors that compete in the Improved Farm Class must be fully inspected, registered, and driver membership paid in full in order to compete at any Back Road's sanctioned events.

 

General Farm Stock Rules: If you don’t fit in the rules above
 

Engines

1. Each competing vehicle must have a working ISSPRO #019R8906 magnetic pickup attached to the front of the engine to measure engine RPMs. The lead from the pickup to the rear of the vehicle is to be made of 14-16 gauge wire attached to an 110V, 3 prong female electrical outlet. The 2 wires from the pickup need to be attached to the 2 main spades, not the ground spade, of the electrical outlet. This outlet receptacle needs to be mounted next to the rear mounted air shutoff cable. Wire must be one (1) continuous wire outside the side rails and visible. NO SPLICES!!! The pickup MUST be in working order during competition. If a competitors pick up does not work during competition the vehicle will be disqualified. 

2. Engine must be stock block for that make or model.

 

3. Engines are limited to agricultural produced intake and exhaust manifolds. 

4. No intercoolers allowed. OEM agricultural intercooler manifolds are allowed without any cooling assistance hooked up. 

5. Tractors are limited to 505 cubic inches.

6. Farm Stock tractors are limited to a single turbocharger with a 2.4 inch inducer bore. Compressor wheel must protrude into the inducer bore at least 1/8 inch and a maximum of 2 inch. No BOAT PROP TURBOCHARGERS!!! A single MAP grove allowed, no bigger than .250. All air must pass through the 2.4 turbocharger bore.
 

7. Maximum fuel pump is a Bosch P7100

11. No aluminum or aftermarket heads are allowed. NO RECAST HEADS ALLOWED. 

12. Engine must be stock appearing for that make and model of tractor.

 

Chassis 

1. Tractors are to be stock appearing. This is a Farm Stock class and should be presented as such. 

2. All housings must be stock appearing for that make and model of tractor. 

3. Must run OEM axles and axle housings for that make and model of tractor.(including Planetary axle) 

4. Fenders are required. 

5. Aluminum rear wheels allowed

Exhaust Systems
Exhaust - A smoke tube is required. Exhaust must have two 3/8 bolts, grade 5 minimum, positioned in the exhaust tube 90 degrees to each other and within 1 inch of each other. Fuel and Fuel Containers
1. No nitrous oxide, oxygen or nitro methane.
2. Tractors must run on diesel.
3. Water injection allowed. Water must be purchased from Whatssmokin Promotions

Kill Switches
1. All diesel competing vehicles must have an air shut-off and fuel shut off in working at order at all times. 
2. On a diesel tractor, the kill cable must activate the air shut-off or fuel shut off required on a diesel engine. A cable may be used for this purpose, but must have positive type enclosed cable for the air shut-off. The cap must have a spring loaded closing mechanism. It is recommended that a gasket / seal arrangement be used. to more effectively shut off air flow. Door or rain cap air shut offs (no butterfly type) will be required on all self ignition engines with a separate control for the driver. Control for driver not to be the same as for the sled. No electrical operated air shut-offs allowed. 
3. All kill switches must be mounted independent of drawbar and/or wheelie bars / stabilizer bars. 
4. The kill switch must be located in the rear center (maximum of 6 inches off center in any direction), approx four feet above the hook point. 
5. The breakaway kill switches must have attached to them a minimum of a 2-inch diameter ring, with a minimum 1/8 inch cross-sectional thickness. The cable from the sled will be attached to this ring. 
6. Portion of the kill switch and mounting bracket(s) must be able to withstand 32 pounds of pull per switch when pulled independently or collectively. 
7. Diesel engines must have a fuel shut-off valve control within easy reach of driver (your normal fuel shut-off on diesel pump). All diesel engines must be equipped with an emergency shutdown air shut-off at the air intake, which can be utilized from the tractor seat. Stabilizer Bars

 

Drawbars and stabilizer bars: 

1) Drawbars shall meet the following: drawbar to be a minimum of 2 square inches total steel material at any point. This includes the area of the pin with the pin removed. The pin will be a minimum of 7/8 inch. Drawbar must be equipped with a steel hitching device not more than 1.5 x 1.5 square, (or 1.5 round), and with an oblong shaped hole 3.75 inches long and 3” wide. 
2) No drawbar support tubes attached above the centerline of the rear axle, unless using the stock drawbar support for that make and model. Absolutely no drawbar supports designed to pull only from, or to be attached only to a point above the centerline of the rear axle. 
3) Drawbar maximum height 20 inches
4) Drawbar to be no shorter than 18 inches Front Hitch - All vehicles must have a front hitch attached to the vehicle that is capable of supporting the weight of the front of the vehicle. It must be the furthest most point on the vehicle and be centrally located. The hitch must have a minimum of a 3 inch diameter hole to allow for the 3 point mounted hitches on the movers to manipulate the competing vehicles. No weights are to be positioned next to the hitch in a way that may restrict the turning radius of the movers once they have picked up the front of the vehicle. 
5) Stabilizer bars are required. The drawbar assembly will not in any way be attached to the stabilizer bar assembly. 
6) The stabilizer bar must extend a minimum of 32 inches behind a line drawn from the center of the wheel to the ground. Pad must not be more than 10 inches off the ground at 32-inch point and be measured during hitch check before competition. The stabilizer pad must be a minimum of 5 inches square with a minimum of 20 inches allowed from outside of one pad to the other. No crossbars between stabilizer bars allowed behind point of hook. 

Safety
1. Any engine driven fan must be shrouded 360 degrees. 
2. Side Shields - All tractors must have a deflection shield on both sides of the engine, and cover the entire engine, either aluminum or steel not less than 0.060 of an inch thick. There must be a fire wall that separates the operator from the engine compartment with no holes other than those used for controls to pass through. In that instance, each hole is not to have more than one inch clearance around the item passing through the fire wall. .060 of an inch thick steel or .120 of an inch aluminum must run between the frames and under the harmonic balancer to prevent loss of harmonic balancer from the tractor.
3. Clutch must be SFI approved. Certification papers required.
4. Clutch Blanket - Tractors must be equipped with a minimum of 17 inches wide, 6 strap SFI 4.2 clutch blanket. Blanket must overlap a minimum of 6 inches. Please do not use a second hand blanket with holes burnt through it. 
5. All tractors must have tie bars from the rear axle housing to the frame of the tractor. 
6. All pulling vehicles must be equipped with a minimum of 2 lb. Halon type of 2.5 lb. dry-powder type fire extinguisher, full charged with a gauge, in working condition and convenient to the operator. 
7. Personal Safety Equipment - Driver must wear a helmet, snell rating of 85 or higher and neck collar. Driver must wear a fire suit jacket. SFI 3.2A-1 minimum. Driver must wear gloves, SFI 3.3-1 minimum. 
8. ROPS must be modified to Maximum height of 8 feet 6 inches. It is optional to have a roll cage with an SFI, 5 point harness. 

Tires
1. Maximum size is 20.8-38 or 18.4-42
2. Cut tires are allowed

Weights
1. Maximum weight for tractor and driver is 11,000 lbs. 
2. Weights must be safely secured and must not extend rearward beyond rear tires. No weight frame may extend more than 24" beyond the furthest point of the front of the tractor