If you are building a racecar from the ground up, you may also want to consider stitch welding or riveting the entire unibody structure. Stitch welding or riveting the overlapping seams of metal will increase the overall rigidity of the chassis without adding any additional weight.
Can you reinforce a car?
Frame reinforcement also provides comfort for your ride
The second main advantage of stiffening up one of these old cars is actually comfort. … Now that can all be fixed once the frame is properly reinforced and stiffened, and your shocks and springs can work as they were designed.
How do you stiffen a unibody car?
Unibody chassis stiffening can be done in a number of ways.
Another way is to relocate the factory leaf springs, if they are present. Stiffer radiator supports and torque boxes, strut bars and fender ties are also added to help reinforce weaker points of the unibody.