Subframe bushing collars takes up slop developed by old rubber or urethane subframe bushings, to yield a more responsive suspension and reduced wheel hop. These 8 piece CNC machined aluminum collars install above and below the bushings which retains the stock anti-squat geometry. Top collars are slotted to allow for installation of the collars without having to drop the subframe.
Hard urethane subframe bushing spacers are used to tune anti-squat by rotating the instant center of the rear suspension through rotating the subframe or moving the subframe relative to the center of gravity:
For maximum squat (eg. drag racing), rotate the instant center down by installing large diameter spacers above front subframe bushings and small diameter spacers below rear subframe bushings.
For slightly increased squat, lower the instant center by installing spacers above all subframe bushings.
For slightly increased anti-squat, raise the instant center by installing spacers below all subframe bushings.
For maximum anti-squat (eg. drift), rotate the instant center up by installing small diameter spacers below front subframe bushing and large diameter spacers above rear subframe bushings.
Note: These spacers cannot be used in conjunction with subframe collars.
Our CNC machined T6061 aluminum subframe bushings completely replace the stock bushings to eliminate free play of the subframe relative to the chassis. Solid subframe bushings will transmit more drivetrain noise to the cabin, but will greatly reduce wheel hop and improve suspension performance. And in the long run, rubber or urethane bushings will always need replacement, these aluminum bushings will last the life of your car.
Beware of cheap copies of our subframe bushings! The copies are made from our original 2003 design, our bushings are superior:
Accurately CNC machined in the USA to exact tolerances. Tolerances off by a few thousands of an inch can make the bushings near impossible to install!
USA T6061 aluminum stock.
Taper on hole for top bushing to make alignment of the subframe onto chassis studs easier.
Revised bushing height to eliminate slop on certain cars with longer threaded studs.
Correct counter bore size so the lower cup/brackets will sit flush on the bushing.
Installation notes:
Stock bushings have to be pressed/cut out from the subframe to install these aluminum bushings.
Place bushings in freezer for a few hours prior to install, in most cases the bushings will slip right in.
Bushings with counter-bore are installed on the bottom of the subframe, bushings with flat surface install on top.
Rubber or urethane bushings deform slowly over time and causes excessive movement of the differential and creates wheel hop. Our CNC machined T6061 aluminum differential mounting bushings will hold the differential solidly to the subframe, significantly reducing wheel hop and improving power transfer to the ground. In addition, reduced movement of the differential during hard launches can also help prevent damage the drive shaft and half shafts.
Note: More drivetrain noise will be transmitted into the cabin.
Made in the USA
Nismo differential bushings are made of stiffer rubber vs. stock, and will reduce differential movement and wheel hop. Driveline noise will be increased though slightly less noisy than aluminum bushings.
