About AGTRRA

The American GT Road Racing Association, LLC was formed to take advantage of:

  • A cyclical slowdown in racing
  • The abandonment of this class of car by many sanctioning bodies
  • The disillusionment by teams with current series operators and the upward spiraling costs of racing while sponsorship lags.

American GT cars are purpose built replicas of series produced Touring or Grand Touring Automobiles such as: Mustangs, Corvettes and Camaros. The series produced cars exemplify the American automotive tradition of affordable ample horsepower and great looks. American GT cars feature tube frame chassis, V-8 or V-6 pushrod, carbureted engines with composite bodies. Tube frame construction enables preparation of extremely high performance road racing vehicles. These cars are capable of speeds in excess of 200MPH and pulling 2.5gs.

Our Vision

Currently a large field of tube frame GT style cars exists throughout Canada, America, the Caribbean, Central and South America and elsewhere without a single owner-friendly professional sanctioning organization. The field consists of former Grand-Am GTS, current SCCA GT-1 and former and current Trans-Am cars. We are organizing the field into a series pitting competitors from various countries into a competition to be crowned the American GT Inter-Americas Champion, promoting nationalistic rivalries while reaching American, Canadian and Latin Markets. We want the best venues to showcase our competitor’s talents and sponsor’s products. The races at Mosport and Lime Rock were both part of large, spectator-fueled events. The tracks we pick will be chosen for a combination of challenge for the competitors, geography, spectator appeal, and economics. Our focus is always on the competitors and sponsors.

About the Cars

The Cars as described above are purpose built tube framed racecars. The external shape and recognizable features of the body, original roof line, front and back window angle and shape are maintained throughout the carbon fiber bodywork. Front under wing and rear wing of a single-element Liebeck airfoil #LD104E scaled to a chord length of 11 inches X 72 inches are permitted. Louvers or air extractors over the front wheels are also permitted. The tube frame is generally limited to a 102-inch wheelbase with a minimum ground clearance of 2 inches. Over the years engine performance has increased dramatically due to refinement in the heads. Any engine builder will discuss stroke, bore, cam lift and duration, timing and aspiration with everyone but the heads are where the engine builder’s art or craft is practiced and each has their secrets.

The biggest challenge we faced in preparing the rules was the differences in the equipment that existed. So we started with dyno runs on various head types, displacements and carburetors. This allowed us to set a power to weight ratio for each head type and displacement. We then added or subtracted weight for other benefits and handicaps such as four speed transmissions vs. five speeds, aero package, wheel width and rim size etc. It is mandatory that all major engine components and parts are for sale to the public in a regular product offering.

  • The cylinder block’s angle of cylinders, number and type of main bearings, location of camshaft and overall configuration must be identical to the production engine.
  • The engine must be located so that the rear of the engine block is no further than 19.250 inches behind the front axle centerline.
  • Pistons rods and pins must meet certain minimum weights.
  • Only magnetic steel crankshafts are permitted.
  • Only analog ignition amplifier boxes and RPM limiters that do not contain programmable computerized or memory circuits are permitted.
  • The distributor must be mounted in the stock location.
  • Currently traction control is not permitted.
  • Only mechanical water pumps belt driven from the crankshaft are permitted.
  • Engine lubrication is via a dry sump system with the oil reservoir tank mounted with in the main chassis framework.
  • Clutches must be a minimum of 5.5 inches and made from magnetic steel.
  • Carbon clutches are permitted.
  • Transmissions are limited to five forward speeds and must use a mechanical H pattern shift linkage.
  • Drive shafts must be racing type made with a minimum diameter of 3.5 inches and a wall of 0.065.
  • Rear axels are open to type.
  • All four wheels must be the same diameter.
  • The frame and role cage must be made of magnetic steel and be welded.
  • Carbon fiber as a primary structural component is not permitted.
  • Only basic coil over double wishbone, with one adjustable shock per wheel type suspensions are permitted.
  • Brake systems consist of magnetic cast iron or cast steel rotors with a maximum diameter of 14 inches, dual master cylinders, and one brake caliper with a maximum of six pistons and two pads per wheel.
  • Fuel is limited to race gas of various octane ratings with or with out lead.
  • Rigorous safety equipment standards are employed.