Technical Information

Advantage Online

Advantage Online: 2008 Archives

The GT-R uses a multi-material design of high-strength steels, aluminum, and carbon fiber. The mix of materials gives the GT-R a favorable ratio of high power to low weight and helped Nissan achieve a tight build tolerance.

High-strength steel is used for most of the GT-R structure, such as the front and rear lower rails and the A-pillars. Ultra-high strength steel is used in parts of the door opening internal structure to increase occupant safety (see Figure 2). Squeeze-type resistance spot welding is the primary joining method used for the steel structure. Laser welding is used in the front corners of the roof and on the package tray. Laser welding joins panels where they overlap by fusing the materials with a laser beam, welding through the top panel, joining it with the panel underneath (see Figure 3).

Cast aluminum is used for the GT-R front strut towers, door shells, and rear bulkhead (see Figure 4). The front strut towers and rear bulkhead are attached to the steel structure using adhesive and bolts. The adhesive is used to increase structural integrity and to act as an isolator between the dissimilar metals, preventing galvanic corrosion (see Figure 5).

Carbon fiber panels, along with plastic and sheet-molded compound panels, are used to completely close out the GT-R underbody. This gives the GT-R very low drag co-efficiency, increasing the aerodynamics of the vehicle. Carbon fiber is also used for the radiator core support, which is bolted to the front steel structure.

Collision Repairs

With the introduction of the GT-R, Nissan dealers that are authorized to sell the GT-R must be affiliated with a Certified Nissan GT-R body shop. Nissan recommends that all structural repairs and other specific repairs be done by Certified Nissan GT-R body shops (see Figure 6).

Nissan North America contracted I-CAR to develop and deliver a one-day live training program for selected collision repair facilities. The one-day live training covers vehicle concept, structural design, and in-depth vehicle repair processes and recommendations (see Figure 7). Along with having one representative attend training, the repair facility must also use a dedicated fixture system for GT-R structural repairs. Nissan recommends the use of a Celette dedicated fixture system to help restore the original accuracy to the vehicle.

The GT-R has a four-stage refinish color available. The four-stage silver metallic, Nissan color code KAB, is applied at the factory as a basecoat (1), clearcoat (2), ultra-silver-affect basecoat (3), and final clearcoat (4) to make the four-stage finish (see Figure 8). Refinishing technicians should check with their specific product maker for recommendations on replicating this new four-stage color.

Conclusion

The 2009 Nissan GT-R has a high level of accuracy placed throughout the construction and design. While minor cosmetic repairs and refinishing processes may be done by any well established collision repair facility, Nissan has taken steps to promote that structural damage be repaired at a Certified GT-R body shop. The facility must have the recommended equipment to restore the original accuracies of the vehicle and trained technicians that attended the one-day live program at the I-CAR Tech Centre. Nissan is taking these steps for the benefit of GT-R owners, in the event of collision damage to their GT-R vehicle, that trained technicians will have the skills to achieve a complete and safe repair.

For comments or suggestions on the Advantage Online, please contact I-CAR Senior Instructional Designer Bob Jansen at bob.jansen@i-car.com.