IMCA

  • Typical HP
  • Typical Rear End
  • Typical Axle Lengths
  • Axle Type
  • Forward
    Bite
  • Most Throttle Turn
    (a bit Loose On Exit)
  • Some Forward Bite
    & Throttle Turn

IMCA A-Mod

  • 575
  • QC or 9″ Ford
  • 9″ = 28.50″ / 32.50″
  • All Gun-Drilled Axles
  • L = 1.080″
    R = 1.100″
  • L = 1.080″
    R = 1.145″
  • L = 1.080″
    R = 1.130″

IMCA B-Mod

  • 450
  • 9″ Ford
  • 9″ = 28.50″ / 32.50″
  • Often a “Solid” axle rule
  • L = 1.080″
    R = 1.100″
  • L = 1.080″
    R = 1.145″
  • L = 1.080″
    R = 1.130″

IMCA Sport Mod

  • 375
  • 9″ Ford
  • 9″ = 28.50″ / 32.50″
  • Usually a “Solid” axle rule
  • L = .940″
    R = .960″
  • L = .940″
    R = 1.130″
  • L = .960″
    R = 1.115″

Here is what you can expect from the options listed:

Using the smallest axle diameter allowable (based on HP) you will encourage both left & right axles to “wrap-up” at virtually the same rate. Maximizing axle wrap will make it more difficult for the tire to break traction on acceleration, whether it’s on corner exit or on restarts. You don’t have to worry about the axle breaking from twisting, the material & design is meant to twist all day without any damaging effect on the axle.

Best Suited Track Type: Dry-Slick