NASCAR TECHNICAL BULLETIN UPDATE 09/06/2012
NASCAR
issued a technical bulletin Thursday, Sept. 6 that reconfirms the
limits NASCAR Sprint Cup Series teams can go in setting up their rear
end suspensions in their race cars. Effective Sept. 12, the truck
trailing arm front mounting bushing assemblies may be built to allow a
maximum of ¼ inch of total movement in one direction only. Truck
trailing arm front mounting bushings must be designed to move freely
throughout the ¼ inch of approved travel. Previously approved front
truck trailing arm bushing assemblies which allow more than ¼ inch of
movement or that do not move freely throughout the ¼ inch travel will
no longer be permitted for use in competition. Approved front truck
trailing arm bushing assemblies must not be altered after being
approved. Wheelbase, rear axle location (parallel), offset and rear axle
housing alignment will be inspected both pre-race and post-race.
"This
doesn’t change any rules that we’ve already had," said John Darby,
NASCAR Sprint Cup Series Director. "It reconfirms how far teams can go
with their rear suspension setups. Teams have found that with a car’s
rear axle steer more is better as it helps with aero and gets the cars
through the corners faster. We are just reminding the teams what the
limitations are and that they cannot go past these limitations. We will
likely address this further in our 2013 rule book."
