Performance, Race

Postdating the 964 and 993 : BBi Billet Uprights

Porsche 964 and 993 platforms are still considered quite sophisticated for their time. But time is unforgiving when it comes to technology advances, materials and design. Time simply leaves everything in its dust.

The market has improved support for these cars with hardware, accessories and electronics, but no one thoroughly addressed the outdated suspension geometry. In 2017 we took on bringing the 964/993 platforms up to date using the latest tools and manufacturing processes. Porsche left a lot on the plate in the 90s and we picked up where they left off. To help with this effort we once again partnered with Scarbo Performance who have years of experience developing complex suspension systems and creating incredible parts.

6 Months of Development | 200+ hours of engineering | 4 iterations

We started off with 3D Laser scanning the front suspension of the 964 and 993 platforms, modelling all the components to create a virtual setup of each car in CAD. Furthermore, we scanned the standard OE uprights as well as the EVO variants to evaluate what were were working with.

With the factory configurations set in CAD we started to work on our design targeting what needed to be updated based on how we needed to set the cars. After a complete kinematics study we needed to eliminate bump steer, address the ackerman angle and add adjustability. Most of the cars we work with are also lowered which cut into shock travel. We found that the Evo uprights were well designed, but still left room for improvement.

After 6 months of development, with over 200 hours of engineering and after 4 design iterations we locked the design. The end result is a geometry, strength and weight optimized part. It is machined form 6061 billet aluminum on 5-axis CNC machines and hard coat anodized in black.


The roll center has been corrected and bump steer has been virtually eliminated. The shock mount was also lowered by 50mm, accommodating lowered vehicles and gaining back shock travel. We have retained full compatibility with OE heat shielding, sensors and bearings. The caliper mounts are designed for the OEM Porsche 993 Brembo units.

The whole upright is not just optimized for suspension geometry but for strength and weight. To ensure best performance on track, the part was subject to extensive FEA testing to be 2x stronger than the OE part. We’ve added structural ribbing to increase rigidity. It has also been optimized for weight. Each upright is just 5.56lbs despite the added strength and denser material.

Bump Steer Curves

The goal is to have no change in steering angle, as the wheels travels up and down (a flat line). The Evo uprights are a significant improvement over OE, but we found further improvement there with the BBi units.
  • Developed for lower ride height: 50mm lower than OEM, non RS

  • Adjusted Strut mount location for full shock travel

  • Corrected Roll Center

  • Virtually eliminated Bump Steer

  • Perfect Ackerman

  • Retains OE Shield Mounting

  • Reinforced Tie Rod and Control Arm mounting

  • FEA Tested for strength vs. weight optimization (2x Stronger, 5.56lbs/pc)

  • 6061-T6 Aluminum with Steel Tapered Inserts

  • 5-Axis CNC Machined

We are very satisfied with the part and the impact it has on these older platforms. Combined with our spherical control arm joints, inner and outer tie rods and a solid coil over setup - it really transforms the car as a whole. We have sold over 50 sets now since the product launched. Francis was one of our first customers with the setup. He tracks and daily drives his car.

"Huge Difference - turn-in is much more immediate, no more on-center wiggle/sloppiness, the weight through the wheel loads up in a nice way now, and that bump steer is no more! The wheel carriers were installed with the tie rods and ball joints from you guys as well. Amazing package!" - Francis

These BBi 964/993 Uprights are available to order as well as the supporting components. We can pre-assemble bearing and help you spec the ideal suspension configuration for your aircooled Porsche.