Full Metal Jacket

The modified roadster frame enjoys a serious cage thanks to the NASA and SCCA guidelines for open GT-1 cars.  The differences in the frame and the tremendous amount of additional tubing mean that street car features like doors that are hinged have been replaced by NASCAR style side impact tubes.  Frame mods accommodate mounting and shielding of the racing fuel cell, intrusion plates and racing seats.    

The chassis is about 15% more rigid than the Mk3 roadster.  Most of the additional steel is for safety, rather than chassis rigidity.  There is no backbone section to the frame, but the full race cage contributes more than that in added rigidity.  Additionally, the fact that the cage is welded along with the frame means that the body needs to be cut along a line from the rear cockpit opening to the back of the roll bar legs.  We send along a carbon fiber cosmetic cover for this area.

The FFR 3-link suspension is the most optimized race suspension we sell, and Challenge frames come ready to use that suspension. 

Owing to the increased amount of steel in the Challenge car chassis, completed vehicles typically weigh around 100 lbs more than standard roadsters.