Everything You Wanted to Know About NASA's American Iron Extreme Racing Series

Created for the kind of racer who loves American muscle and the freedom to create obscene amounts of horsepower within an open rules set, American Iron Extreme is the pinnacle of NASA’s American Iron series. Given the chassis capabilities the aftermarket has created and horsepower potential of American V8 power plants, American Iron Extreme is a showcase for the possibilities of an American muscle car built and set up for road racing. It is as much a series for engineers as it is for drivers to try to control all that power, set fast lap times and capture checkered flags!

The American Iron Extreme Series was created to meet the needs of domestic sedan racers looking for a series specifically tailored to accommodate highly modified vehicles that are currently relegated to racing in Unlimited or Spec limited series. This series is designed to field a large high-profile group of American muscle cars and will unify fields of cars that currently race in other sanctioning organizations. This large field/open modification concept will provide racers and vendors access to a promotional racing venue containing similarly prepared and appearing cars that can run nearly unlimited configurations.

All 1960 through present, American-made sedan vehicles/body styles certified by the United States Department of Transportation for street use at their date of manufacture. OEM and aftermarket “Body in White” type vehicle shells are allowed provided the body style is the same as original DOT manufacture.
  • 2010 Camaro SS $12,000 to $18,000
  • 2005-2009 Ford Mustang GT $4,000 to $10,000
  • SN95 Mustang $4,000 to $6,500
  • Fourth-generation GM F Body $2,500 to $8,000
The American Iron Extreme class has has a 5:1 power to weight ratio restriction.
Minimum weight: 2,700 lbs.
Primary fuels permitted are any grade commercially available unmodified gasoline or ethanol blends such as E85. Secondary fuels such as alcohol or methanol injection are not allowed. American Iron Extreme cars are unrestricted in all performance modifications with the exception of using nitrous oxide power adder systems. Use of nitrous oxide power adder systems is specifically outlawed.
$20,000 to $35,000 depending on modifications
$20,000 to $50,000
  • Replacing windshield with Lexan
  • Single- or double-adjustable coil-over suspension
  • SLA front suspension available to replace McPherson struts
  • Aftermarket brakes
  • Aerodynamics such as a G Stream rear wing, front splitter and Race
  • Louver hood vents
  • Turbochargers
Average cost to run a weekend — $2,200 to $2,800

Tires, size, brand and prices

From Phil’s Tire Service

Toyo Proxes RR 275 35ZR 18 $306

Toyo Proxes RA1 275 35ZR 18 $301

Brakes, brands and prices

  • Front, with stock calipers; Hawk DTC 70 $235
  • Rear, with stock calipers; Hawk DTC 60, $195
Ford Performance, Toyo Tires, Spec Clutches, Ohlins Suspension, Motion Control Suspension, Maxxis Tires, Injector Pulse, Hoosier Racing Tire, Hawk Performance, G-Loc Brakes, Frozen Rotors, Raybestos Brakes, BFGoodrich, AST Suspension.
Yes. Ford Performance.
  • American muscle taken to the extreme.
  • Huge aftermarket.
  • Unlimited modifications and performance potential.
Modifications list can be extensive, thus expensive.
  • Any performance modification is allowed provided the car complies with the class configuration specifications defined in Section 4.
  • All aerodynamic devices must be fixed for competition and shall be made from any material.
  • Venting, louvers, ducting, etc. is permitted anywhere on the car.
  • Brake rotor friction surfaces must be iron.
  • Rear axle assemblies may be modified in any manner. AIX axle housing materials are unrestricted
  • Rear axle assemblies may be modified in any manner. AIX axle housing materials are unrestricted
  • AIX engine blocks are unrestricted, but must use engines from any OEM or OEM equivalent (i.e. no three-rotor Mazdas, Formula 1 BMW’s, or Rolls Royce turbines allowed). Please consult with your local series director if you have questions.


Questions and Answers to Feed Your Curiosity

Not exactly. You can make as much power as you want within a 5:1 weight-to-power ratio. That’s no more than 1 horsepower for every 5 pounds of vehicle weight. If you exceed those power levels, you will be moved up into Super Unlimited where there are no such limits.
All AIX participants must have a dynamometer certification report prior to the start of the race or make arrangements to have a dyno test performed immediately after the race.
Yes, you can race anything from Ford, General Motors or Chrysler Group LLC. It just has to be a front-engine, rear-wheel drive car with a wheelbase of at least 100 inches.
No, you may not. No full tube-frame chassis or chassis conversions are allowed in American Iron Extreme.
No. AIX engine blocks are unrestricted, but you must use OEM or OEM equivalent.
Yes, independent rear suspension is allowed.
Minimum car weight is 2,700 pounds with the driver.
As big as you want. Any size tire available and sold commercially is allowed, as are tire shaving, tire grooving and tire treatment.
Yes you can. All devices must be fixed for competition, but venting, louvers and ducting is permitted anywhere on the car. You can use splitters and air dams, dive planes, canards, but those can’t extend forward more than 7 inches beyond the outline of the OEM stock bumper cover and can’t extend laterally more than 5 inches from the sides of the car. Rear wings and diffusers also are allowed.
Well, you can’t use water cooling and you must use iron rotors, and the OEM antilock braking systems, but calipers are unrestricted.
Yes. Traction-control devices are allowed.


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