Avanti GT Tribute

[GibsonMotorsports]

The unique feature of the backbone chassis is that the transmission and driveshaft tunnel become the primary structural componenent supplying a high level of torsional rigidity, linking the front and rear suspension components, The step down feature refers to the floor being located at the bottom of the frame, providing a lower seating position, and thus a lower center of gravity to promote good handling.



The first priority was to identify all the drivetrain dimensions, stock C6 suspension pick up points, then modify them to accommodate a slightly narrower track width.



We're hoping to take the Avanti GT on several long road trips, such as participating in Hot Rod's Power Tour. Given the intended use, achieving a comfortable ride will be as important as having great handling. In that spirit, we decided on a slightly softer suspension with greater travel than a Corvette, requiring some of the suspension pick up points to be relocated. We had to ensure negative camber gain was managed with greater suspension travel in a manner that did not result in a excessive bump steer.

All of the key measurements were collected, including the dimensions of the modified body to establish the wheelbase, front and rear track width. Then, several sketches were made in an attempt to better understand how to connect everything together. With the Chassis layout designed, it was time to test the modified suspension pick up points to be sure they would perform as expected. All the critical data was entered into Performance Trends “Suspension Analyzer“ software that was instrumental in redesigning the geometry of our late model stock car. By using the different heights available for the inner pivot points of the upper A Frames, we were able find the best position, that gave us the desired negative camber gain, with minimal toe change.