Mark Seymour - Reference and Resources

Login FormClose

Reference: Ginetta G40 Suspension Specs

Toe

  • 1mm out at the front
  • 1mm in at the rear

Anti-roll bars / Sway bars

GRDC 2017-20 competition specs mandated as follows:

    • Front: inner hole (hole 1, stiff)
    • Rear: outer hole (hole 3, soft)

Ride height

GRDC 2017-20 competition specs mandated as follows:

  • 95 mm ground to body (minimum)

G40 Cup (formerly GRDC+) 2018 competition specs:

  • 90 mm ground to body (minimum)

Camber

GRDC 2017-20 competition specs mandated as follows:

    • Front: 3mm + 2mm shim per side
    • Rear: 3mm + 2mm shim per side

Shock absorbers / Dampers

GRDC coilover make: Protech 400 Series, one way (adjusts bump & rebound)

  • C-spanner: 1.9 inch
  • Shock absorber settings: 13 clicks available, hard (stiff) is clockwise
  • Springs front: 800 lb/in
  • Springs rear: 425 lb/in

GRDC+ / G40 Cup coilover make: Quantum One.Zero, Ginetta branded, one way (adjusts bump & rebound), different front and rear

  • C-spanner: 68-75 mm with lug (e.g. Gedore available from Amazon). One full turn of the coilover collar is approximately 1 mm in ride height.
  • Shock absorber settings: 24 clicks available, clockwise to set stiffer. When adjusting, it's easier to go full stiff then adjust back to soft because you can feel the clicks clearly when going downwards. The rear shock is upside down compared to front, so the adjuster is at the top. The units are also marked as F and R (for front and rear).
  • My suggested starter settings are: Rear 6 clicks from soft (18 from hard), roll bar full soft. Front 21 clicks from soft (3 from hard), roll bar medium.
  • Springs front: 800 lb/in
  • Springs rear: 425 lb/in
  • Front with C-Spanner

Rear suspension images (hub, sway bar linkage, toe linkage, upper / lower wishbones, coilover)

See also