2.6 DIESEL CLASS RULES:
1. Class weight is 8,000 pounds with driver.
2. Ballast is permitted. Front hanging weights are permitted. Front ballast and ballast mounting point must be easily removable, but securely mounted. May not extend more than 60 inches from the centerline of the front axle and be high enough to clear scale and other pit obstacles. If it hits the scale it must be removed to compete. Ballast may be added to the bed of truck. If used it must be securely fastened to the bed. Final decisions rest with the technical department.
3. Batteries must be securely mounted. They may not be located in the driver compartment or forward of the radiator core support.
4. Body must be the OEM truck body including the full bed floor. The body must retain full sheet metal. Metal aftermarket hoods are permitted. Fiberglass hoods and roll pans only are permitted. All fiberglass hoods must be shielded on the underneath side with sheet metal or aluminum skin a minimum of .060 thick. The hood must be closed and securely latched while the truck is hooked to the sled. The complete OEM firewall and complete OEM floor pan is mandatory. A factory installed pickup bed or commercial style aftermarket bed must be installed.
5. Four wheel hydraulic functional brakes are mandatory.
6. OEM chassis is mandatory. The engine must be in the OEM location for the body used. The vehicle must retain the OEM chassis. Wheel tubs, back half conversions, tube chassis, etc, are prohibited.
7. Radiators must be in stock location and be of at least stock size.
8. An OEM transmission and transfer case are mandatory. They must have been an option on a one ton or smaller pickup.
9. Engine block must have been available as a factory option on a one-ton or smaller pickup truck. Cubic inch limit of 444 CI. Water pumps may be factory or electric powered. All factory belt driven accessories, excluding the air conditioning compressor, must be retained and powered via the crankshaft by a standard serpentine or “V” belt. Electric cooling fans are permitted.
10. All vehicles must be equipped to direct exhaust upward. The exhaust must exit rearward of the driver’s compartment or through the hood. Stacks exiting through the fender well are prohibited. Two(2) 3/8 inch diameter bolts must be installed through exhaust pipe in a cross pattern within one(1) inch of each other as close to the turbo as is possible. This will be teched. Bolt heads welded to the pipe or sheet metal screws to mimic this will be grounds for disqualification.
11. The fuel must be pump #1, #2 diesel or Soy/Biodiesel. Off road is prohibited. Fuel must be commercially available. A fuel cell may be sued in place of the factory fuel tank. It must be mounted securely in the bed of truck.
12. Fuel injection pump is limited to cylinder number specific (IE: 6 cylinder pump on a 6 cylinder motor ). Dual high pressure common rail fuel pumps or HPOP’s are permitted. Ag governors are allowed. No Sigma or 12 cylinder pumps allowed.
13. All engines turning more than 4500 RPM must be equipped with a harmonic balancer or dampener meeting SFI Spec 18.1.
14. The hitch must be a receiver style hitch. Reinforcements are permitted. Reinforcements must not extend forward of the center line of the rear axle and must remain inside the frame rails. The hooking point must be the rear most point on the vehicle and must be rearward of the stock location of the tail-gait. The hitch must be horizontal to the ground and stationary in all directions. Bumper may be notched or removed. The hitch’s height from the ground may not exceed 26 inches. The hooking point must have a minimum of 3 inch by 3 ¾ inch inside opening for the sled hook. The hooking point must be a minimum of 44 inches from the center of the rear axle, to the end of the hole where the hook touches metal to be pulled from, this is the hooking point.
15. Factory style or aftermarket intercoolers are allowed. Water to air intercoolers allowed. Ice and water must be weighed at the time of crossing the scales.
16. A complete interior, including dashboard, door panels, headliner, etc. is mandatory. Two matching front seats are mandatory. Aftermarket seats are permitted, they must be fully upholstered. All factory controls, lights, windows, signals, wiper, etc, must be retained and in working order. The use of hand throttles is prohibited. Aftermarket gauges are allowed.
17. All trucks are required to have a kill switch located on the back of the truck, located near the hooking point. On trucks with electric injection fuel pumps, it must have an electric shut off or disconnect for the injection pump on the back of the truck. For trucks with manual injection pumps, they must have an air guillotine of the spring loaded type, no butterfly type to kill the air intake to the engine. It is recommended to have an air shut off on all trucks. Kill switch failure will result in disqualification.
18. Nitrous oxide is prohibited. No other oxygen extenders are allowed. All system components must be removed from the truck.
19. Propane is prohibited. All system components must be removed from the truck.
20. Non-OEM rear-end housings are prohibited. The rear end housings must have been for a one ton or smaller pickup. Rear axle bolts must be covered with a cap or shield.
21. The vehicle must retain the full, original OEM steering gear. The vehicle must retain the original OEM power assistance, if it was so equipped. Additional stabilizers are permitted. Non-OEM power assist methods are prohibited.
22. Complete headlight and taillights assemblies are mandatory and must be operative, except the right front headlight may be removed for air inlet to engine. Complete OEM windshield and all other windows are mandatory. Windows must be able to operate per factory specifications. They must open and close via electrical or mechanical means.
23. The factory suspension configuration must be retained. Modifications to the front suspension that would alter the original location (IE; moving it forward or backward) are not permitted. Strut tower braces, lower tie bars, sway bars and limit straps are permitted. Traction bars and devices are permitted. Air shocks are prohibited.
24. An OEM style suspension is mandatory. Traction bars and devices are permitted. They must be bolt on only. Welds are permitted for attachments to the frame or axle housing. Traction bars if installed must have a chain or cable to some type of safety device mounted one (1) foot from the front support to catch the bar in case of failure. Control arms may be strengthened or replaced, providing all original mounting points are retained and used. Sway bars, lower tie bars, limit straps and camber kits are permitted. The rear suspension may be solid with a removable block. Air bag spring assist and air shocks are prohibited.
25. The tires must be DOT street tires. Cut tires are prohibited.
26. Non OEM transfer cases are prohibited. It must have been an option on a one ton or smaller pickup truck.
27. Automatic transmissions: Non OEM transmissions are prohibited. Aftermarket torque converters, valve bodies and internal components are permitted. Transmission brakes are prohibited. Any non OEM floor mounted automatic shifter must be equipped with a spring-loaded positive reverse lockout device to prevent the shifter from accidentally being put into reverse. A functional neutral safety switch is mandatory. Vehicle must not start in gear. All transmission lines must be metallic or high pressure type hose. All automatic transmissions must be equipped with a transmission shield meeting SFI Spec 4.1 and must be labeled accordingly. A blanket type shield must be used and appropriately labeled as meeting SFI Spec 4.1 and it must extend from the rear of the engine block to the rear of the tail housing with a minimum of six (6) inch overlap where it is fastened. All vehicles using an automatic transmission must be equipped with a flex plate meeting SFI Spec 29.1.
28. Manual transmissions: Non OEM transmissions are prohibited. Aftermarket internal components are permitted. A clutch meeting minimum SFI Spec 1.1 or 2.1 is mandatory on all engines. All manual transmissions must be clutch assisted. Sequential shifters are prohibited. All transmissions must have a flywheel shield labeled as meeting minimum SFI Spec 6.3 or greater. Applications for which an SFI Spec flywheel shield is not available may use a properly attached SFI 4.1 or 4.2 blanket that completely covers the bell housing. It must be attached to the rear of the engine block and extend rearward to the transmission with a minimum of six (6) inch overlap where it is fastened. All transmissions or clutch pedals will have a safety interlock switch so that vehicle will not start in gear.
29. The vehicle is limited to a single 2.6 inlet turbocharger. The compressor wheel must protrude into the compressor inlet bore 1/8 inch. The 1/8 wheel protrusion must be cut flat and square. NO TAPERED CUTS. The inducer bore on the compressor housing is limited to 2.6 inches and the bore must be uniform in size throughout the diameter. No oval or egg shaped bores will be allowed. The inducer bore is non-removable and must be maintained for 3/4 of an inch from the front face of the compressor wheel. The inlet will be measured with a 2.65 plug or internal calipers. The plug must not be able to enter the inducer bore. A map width enhancement (MWE) groove is allowed. No MWE groove width greater than (.200) of an inch will be allowed. The entire MWE groove must be placed behind the cut or step on the wheel for the protrusion into the inducer bore. Turbos with non-stepped wheels, true 2.6 or smaller must still have the 1/8 protrusion into the inducer bore and the 2.6 bore must be maintained for 3/4 inch in front of wheel and may have a MWE groove no larger than (.200) of an inch wide behind the face of the wheel. All provisions allowing air to the wheel other than via the bore inlet and the MWE groove are prohibited. The 6.4 power stroke engine may utilize the factory twin turbo configuration. The driver will be responsible for making compressor wheel and bore accessible for tech personnel to measure bore and inspect compressor wheel.
30. Water injection is prohibited. All system components must be removed from truck.
31. The vehicle must retain the original factory wheel base and track width. Cab and chassis trucks may not exceed 172 inch center to center of axles. Front dual-wheel spacers may be used only with accompanying positive-offset dually style wheels.