Technical Infos

  • A little piece of history

 

Tractor pulling competitions first appeared in Quebec in 1970, at the St-Hyacinthe agricultural fair. In 1975, the fair board signed a contract with the Ontario Tractor Pulling Association to hold the first modified tractors pull. Because many events were organized throughout Quebec and rules differed from one place to another, a group of amateurs got together and established the basis of what is now the ASTTQ in the fall of 1978. In December 1978, the ASTTQ became the only structured organization of tractor pulling in Quebec.

 

  • Primary goals

 

The primary goals of the ASTTQ were to lay out a set of rules that would make the competitions fair and safe for everybody. We then went on to build a sled that would be adapted for modified vehicles, which were becoming more and more popular. To determine the season’s champion from each category, a circuit was established along with a point system.

 

  • From farm tractors to semi trucks

 

In its first year of operation, the ASTTQ sponsored 16 competitions throughout Quebec. Although the majority of pulling vehicles consisted of farm tractors and street 4X4’s, there were also a few modified tractors. Today, the original stock tractors classes have been replaced with classes with a bit more action… The modified 4X4 trucks appeared in 1981, the pro stock then super stock class in 1982, the modified minis in 1985, the two wheel drive trucks in 1991, and finally the semi trucks in 1999.

 

  • Transformations done on the sled

 

The club’s equipments also have undergone drastic transformations since the beginning. The sled was completely transformed to make it self-propelled and more efficient. In the spring of 1991, a new mini sled was built in order to fulfill the requirements of minis getting more and more powerful. And in the winter of 2004-2005, the big sled had been modified once again to include a diesel engine, an enclosed cab for the operator, and mostly to assure a top quality competition with the ever improving pulling vehicles. And finally in 2012, the big sled has been sold to make room for an Ironman sled which is the standard in the Grand-National type competitions.

 


 

  • Mini modified tractors

 

Mini modified use automotive-type engine(s), with 2 valves and 1 operating spark plug per cylinder, cast iron or aluminum.

The vehicle’s dimensions are limited to 6 feet wide and 8 feet from the center of the rear wheels to the from of the vehicle.

The weight of the class is 2050 lbs.

The tire’s rim diameter is limited to 16.1”.

 

Maximum limitations:  

Maximum of 575 c.i., naturally aspirated.
 1 small block blown engine, maximum of 380 c.i.
– Supercharger limited to 6-71 with 18% overdride, or 8-71 with 10% overdride.
– Turbocharger limited to a single stage.
– Retrofit type, high Helix or modified configurations of superchargers are not allowed.

 


 

  • 4X4 modified trucks

 

The vehicles in this class must have 4 wheel drive and weight a maximum of 6200 lbs.

The vehicle must have a hood, grill and fenders in place as intended by the manufacturer.

The body style must be or have been available from a dealer as a mass produced vehicle and it must maintain the original appearance.

The frame may be different than the make and model of the body. Tubular steel frames are allowed.

The maximum tire size is 112” circumference on a 18” rim, inflated to 30 PSI.

 

Maximum limitations:  
 
 
 
 

1 automotive-type engine with a maximum of 8 cylinders and 650 c.i.
– Naturally aspirated only.
– 2 valves and 1 operating spark-plug per cylinder.
– No diesel engines allowed.
– Legal fuels are gasoline and alcohol.

 


 

  • Super stock tractors

 

Tractors with cast-tub type frames (Oliver, Cockshutt, White) are allowed to remove the frame from the front of the transmission housing.

Engine and clutch housing are to remain in the original location and mounted solid as intended by the manufacturer.

Any alteration to the chassis shell must have the approval of the ASTTQ or NTPA technical service.

Tubular steel frames are allowed.

The principal criteria being the retention of the original stock appearance.

The only engines considered legal must be available in two wheel drive farm tractors.

The engine’s block of a given brand is to remain consistent with that brand sheetmetal.

The engine block can’t be modified externally from EOM configuration, except for repair or mounting fuel injection pump.

The maximum wheelbase is 114 inches with a maximum overall length of 13 feet from the center of the rear axle to the most forward point of the vehicle.

The weight of the class is 8200 lbs for diesel engine tractors, 8200 lbs for alcohol engine of 410 c.i. or less tractors, 7700 lbs for alcohol engine of more than 410 c.i. tractors.

 

Limitations maximales:  

Engines are limited to 2 valves per cylinder, 3 pressure stages and 4 turbochargers.
 Diesel engines are limited to 650 c.i.
 Alcohol engines are limited to 505 c.i.

 


 

  • TWD trucks

 

The maximum length of the vehicle is 15 feet from the center of the rear axle to the most forward portion of the vehicle, including weights and racks.

The maximum width is 8 feet and the weigh must not exceed 6200 lbs.

The chassis may be a truck frame or a fabricated frame similar to the modified tractor’s, tubular steel frames are allowed.

The vehicle must have a hood, grill and fenders in place as intended by the manufacturer.

The vehicle’s body style must be or have been available from a dealer as a mass produced vehicle and it must maintain the original appearance.

The maximum tire size is 143” circumference on a 18” rim, inflated to 28 PSI.

 

Maximum limitations:  

1 automotive-type engine with a maximum of 8 cylinders and 575 c.i.

 

– 2 valves and 1 operating spark-plug per cylinder.

 

– Maximum of 1 stage of compression, either by supercharger or turbocharger.

 

– Supercharger is limited to 14-71.

 


 

  • Modified tractors

 

Modified tractors are allowed any combination of engines, transmission and final drive.

No portion of the vehicle may exceed 14 feet from the center of the rear wheels to the front of the vehicle.

The weight of the class is 7500 lbs.

Tires are limited to 30.5” wide.

 

Maximum limitations:  
 
 
 

4 blown automotive engines.
– Superchargers are limited to 8-71.
– Turbochargers are limited to a single stage.
– No intercooler allowed.

 

3 blown automotive engines.
– Superchargers are limited to 14-71.
– Turbochargers are limited to a single stage.
– No intercooler allowed.

 

5 naturally aspirated automotive engines, big blocks.

 

6 naturally aspirated automotive engines, small blocks.

 

2 V-12 aircraft engines.
– Maximum of 2 stages of compression per engine.

 

1 V-12 aircraft engine, plus 1 automotive blown engine.
– Auxiliary stage of compression allowed on the V-12.
– Supercharger is limited to 8-71 on the automotive engine.

 

2 industrial or marine-type engines.
– Diesel allowed.
– Maximum of 2 compression stages per engine.

 

1 JFTD-12 turbine engine.

 

2 T-55 turbine engines.

 

2 T-64 turbine engines.

 

5 T-53 turbine engines.

 


 

  • Semi trucks

 

The truck must have a valid licence certificate.

The hitch must be bolted on the frame, reinforced place of 0.5 inch is allowed.

No reinforced plate on the frame behind the hitch higher than the pivot point will be allowed.

No weight can be added to the truck.

Road tires (DOT) only with a maximum size of 11.0 x 24.5.

 


 

Note to the Reader:

The information on this page is simply for spectators/readers knowledge about the main lines for each class.

The information on this page WILL NEVER REPLACE the official rules included in the rule book of the ASTTQ of the respect year.