RSS: Project GUMBO 4.0
#64
RSS: Brake Upgrade
RSS: GIRODISC – 380mm/350mm Slotted 2-Piece Floating Discs for 997.2 GT3/RS (Kit #758)
Girodisc Racing Brakes and Technology offer performance advantages in the areas of weight reduction, durability, and brake cooling.
(Girodisc vs. OE Steel Rotors)
Girodisc Slotted
380mm 22.3 lbs (2 lbs. rotating weight reduction)
350mm 18.3 lbs (2.45 lbs. rotating weight reduction)
Porsche OE
380mm 24.3 lbs
350mm 20.75 lbs
Girodisc Performance Advantages
Why discs are slotted:
Slotting aids the disc in several ways:
-The edges of the slots continuously clean and refresh the pad surface. This will allow the pads to have to have a maximized friction surface always available. Additionally, they prevent contaminates from collecting between the pad and disc interface.
- The disc is lightened, decreasing its rotational inertia.
- Slots prevent the formation of a water film on the disc in wet weather, maintaining the best brake response.
Why reducing the weight of the braking system benefits the vehicle:
The mass of any vehicle requires energy to accelerate or decelerate. Reducing the vehicle mass improves acceleration, and requires less energy to be dissipated during deceleration. Rotating mass requires additional energy in order to increase or decrease its speed of rotation. Decreasing the mass of the disc has a great benefit due to the reduction in the rotational inertia. This will allow more of the braking force to be available to decelerate the vehicle, not the disc.
Additionally, the mass of the brake system is also unsprung mass. Reducing the unsprung mass has the benefit of improved suspension performance, resulting in enhanced ride and handling. This is due to the fact that rotating masses require additional energy to vary the plane on which they turn. The lighter the disc, the quicker the response of the vehicle steering due to the reduction in gyroscopic effect from the reduction of the rotational inertia of the disc.
Directional rotation of the discs:
For an internally vented disc, the geometry of the vanes dictates the direction of rotation. There are many ways in which a vented disc can have the vanes oriented. For maximum airflow and superior cooling, the Girodisc system uses the curved vane system. The curved vane creates a centrifugal air pump. The rotation of the disc causes air to be pumped from the center of the disc, through the vanes, and out through the outside diameter of the disc. This greatly enhances the disc’s ability to dissipate heat. The curved vane system was developed for racing vehicles where the removal of excess heat is critical for braking system performance.

380mm 2-pc. Center-lock Front Disc with Pagid RS-19's



350mm 2pc. Center-lock Rear Disc with Pagid RS-19's

Girodisc Racing Brakes and Technology offer performance advantages in the areas of weight reduction, durability, and brake cooling.
(Girodisc vs. OE Steel Rotors)
Girodisc Slotted
380mm 22.3 lbs (2 lbs. rotating weight reduction)
350mm 18.3 lbs (2.45 lbs. rotating weight reduction)
Porsche OE
380mm 24.3 lbs
350mm 20.75 lbs
Girodisc Performance Advantages
Why discs are slotted:
Slotting aids the disc in several ways:
-The edges of the slots continuously clean and refresh the pad surface. This will allow the pads to have to have a maximized friction surface always available. Additionally, they prevent contaminates from collecting between the pad and disc interface.
- The disc is lightened, decreasing its rotational inertia.
- Slots prevent the formation of a water film on the disc in wet weather, maintaining the best brake response.
Why reducing the weight of the braking system benefits the vehicle:
The mass of any vehicle requires energy to accelerate or decelerate. Reducing the vehicle mass improves acceleration, and requires less energy to be dissipated during deceleration. Rotating mass requires additional energy in order to increase or decrease its speed of rotation. Decreasing the mass of the disc has a great benefit due to the reduction in the rotational inertia. This will allow more of the braking force to be available to decelerate the vehicle, not the disc.
Additionally, the mass of the brake system is also unsprung mass. Reducing the unsprung mass has the benefit of improved suspension performance, resulting in enhanced ride and handling. This is due to the fact that rotating masses require additional energy to vary the plane on which they turn. The lighter the disc, the quicker the response of the vehicle steering due to the reduction in gyroscopic effect from the reduction of the rotational inertia of the disc.
Directional rotation of the discs:
For an internally vented disc, the geometry of the vanes dictates the direction of rotation. There are many ways in which a vented disc can have the vanes oriented. For maximum airflow and superior cooling, the Girodisc system uses the curved vane system. The curved vane creates a centrifugal air pump. The rotation of the disc causes air to be pumped from the center of the disc, through the vanes, and out through the outside diameter of the disc. This greatly enhances the disc’s ability to dissipate heat. The curved vane system was developed for racing vehicles where the removal of excess heat is critical for braking system performance.

380mm 2-pc. Center-lock Front Disc with Pagid RS-19's



350mm 2pc. Center-lock Rear Disc with Pagid RS-19's

#66
Tasty Gumbo...
Time for some attention on the inside of the 4.0...
Since this car deserves something special, we decided on our NEW RSS Bolt-In 1.75" Chromoly 4PT 931 Series Competition Rollbar in White.
The RSS 931 Series Competition Rollbar is very robust and with it's full 'X' crossover design to the rear shock towers, blends perfectly with our recipe for this build. The front legs mount to the chassis floor near the B pillar with supplied underplates and hardware.
A few images...











More to come...
Since this car deserves something special, we decided on our NEW RSS Bolt-In 1.75" Chromoly 4PT 931 Series Competition Rollbar in White.
The RSS 931 Series Competition Rollbar is very robust and with it's full 'X' crossover design to the rear shock towers, blends perfectly with our recipe for this build. The front legs mount to the chassis floor near the B pillar with supplied underplates and hardware.
A few images...











More to come...
#68
-Troy












