Suspension Secrets Solid Front Control Arm Bushes – BMW G29 Z4

Increase rear axle stability and predictability with our Suspension Secrets Rear Solid Control Arm Bush for the BMW G29 Z4.

When cornering hard, the rear control arm bushes in the BMW G29 Z4 flex. This flex causes the rear camber angle to change dynamically, which causes a reduction in rear traction as the changing camber results in inconsistent levels of grip through the corner. Any changes to the rear camber angles will also change the rear toe angles, increasing rear instability and causing the rear end to “scrabble”.

To solve this issue we designed our Suspension Secrets Rear Solid Control Arm Bush for the BMW G29 Z4. Compared to the OEM rubber bushes, our solid bushes do not flex, and as a result the rear camber and toe remains constant when cornering, significantly increasing cornering stability.

The key features of the Suspension Secrets Rear Solid Control Arm Bush for the BMW G29 Z4 are:

• Increased rear axle stability on road and track

• Improved sense of connection to rear axle

• Increased cornering grip

• More precise handling when driving quickly

• Motorsport-grade Rodoball bearings

Suspension Secrets’ products are designed and manufacturedin the UK. Our products are made from billet aircraft-grade 6082 T6 aluminium and corrosion-resistant 316 stainless steel. We use motorsport-spec Fluro rod ends and Rodoball bearings for maximum performance and longevity.

Improve braking stability and steering accuracy by installing the Suspension Secrets Solid Front Control Arm Bush for the BMW G29 Z4.

The standard front control arm bushes are made soft rubber with an oil filled liner. When driving fast, these oil filled bushes flex substantially leading to changes in front geometry and an overall vague feeling to the steering on the car. Under heavy braking both of these bushes compress substantially leading to a sensation that the chassis has a delay when coming to a stop. The geometry is also affected under heavy braking, causing the steering to move side to side and lose grip from the front axle.

To solve both of these problems, solid front control arm bushes are required. Our solid bushes are designed as press-fit replacement for the OEM control arm bushes. As our bushes are solid, they eliminate all of the issues caused by the soft rubber bushes. Instead you gain improved braking stability and steering accuracy at the limit.

Our bushes have been designed to use bearings that offer a very minimal increase in NVH, leading to an upgrade that is perfect for both the road and the track as they provide a very large performance gain for a very small offset in NVH increase.

The key benefits of our Suspension Secrets Solid Front Control Arm Bush for the BMW G29 Z4 are:

• Increased braking stability

• Improved steering feel and accuracy

• Reduced understeer

• Increased sense of connection to the road

Further Reading

As standard, the OEM rubber bushes used by BMW are quite soft. They are built for refinement, flexibility and durability. Rubber bushes are quiet and are ideal for a car that is designed to be used frequently.

Unfortunately, when used in a performance application, rubber bushes have quite a few downsides. When braking hard, the OE rubber bushes flex. They flex so much that the wheel assembly moves rearwards as the car brakes. This causes unwanted toe geometry change which causes the car to feel very nervous and vague when braking.

The flex in rubber bushes also causes understeer and the steering wheel to feel very inaccurate during cornering.

Toe

Toe is the angle between each wheel with relation to the longitudinal axis of the vehicle. The animation below illustrates to toe-in, toe-out and zero toe.