![]() ![]() Other ZN6 chassis owners have ran into premature axle failure lowered as little as 1.5”. ![]() Another great example being my own 2013 Subaru BRZ lost an axle and left me stranded at just 75,000 miles because it has been lowered on coilovers with drop knuckles in the rear. Many vehicles, like early Mistubishi Evos, run into an issue that once lowered the CV axle will actually bind and limit suspension travel as well as prematurely wear the CV joints. If the vehicle has independent suspension with Constant Velocity (CV) joint axles, it will be incredibly important to make sure your CV axle angle is not too extreme. Your suspension and steering angles are not the only things to worry about though if you want to go really low. These kits are often called Roll Center Adjusters or RCAS, Bumpsteer kits, or drop knuckles. There are many kits that correct bump steer and roll center simultaneously with tie rods and a roll center correcting ball joint, spindle, strut spacer, or a lowered steering knuckle which will help make your control arms and tie rods more parallel and adjust your roll center to a more effective height.It is incredibly important for all wheel drive and rear wheel drive vehicles have their rear roll center and center of gravity set precisely as getting your roll center wrong will lead to the vehicle being unable to load the tires effectively under throttle input as well as creating the potential for increased wheel hop.Example: Driving over a bump and the tires are forced to steer, thus the name bumpsteer. ![]() If the steering arms or tie rods do not cycle through the suspensions travel on a parallel path to the control arms the vehicle will have a tendency to change toe. Typically as the vehicle is lowered, the control arm angles will become more extreme, while the tie rods will often be at less extreme angles. For men, owning a car is the same as designer jewelry for women.Furthermore, you can begin to experience bump steer, especially on MacPherson strut style front suspension. Some body roll works towards better loading your tires, if your roll center and center of gravity are too close it will be difficult to generate any grip and the car will easily slide.Power is sent to the wheels through this suspension system via a differential that is hard mounted to the rear subframe between the control arms with axles utilizing constant velocity (CV) or U joints so the axles can move up and down as the suspension compresses and extends. These control arms each hinge from their own individual location causing the camber of the wheels to change throughout the suspensions’ stroke, which is known as camber gain. This style of suspension allows both the wheels on the axle to cycle through their travel independently of each other, using individual control arms for each side for location. For the sake of simplicity I will just be covering what to look out for in the most common suspension designs including independent front and rear suspension, as well as solid axle rear suspension.Īlmost every car on the road today, excluding trucks and some SUVs, all have some form of independent suspension utilizing at least a lower control arm on each side as well as using rack and pinion steering. The modifications you have to do for every single vehicle to compensate for lowering them varies. ![]()
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