JRZ RS PRO Sport Dampers
- Double-adjustable dampers
- Remote reservoir
- Adjustable compression settings (14 clicks)
- Adjustable rebound settings (21 clicks)
- Adjustable nitrogen gas pressure
- Quick-disconnect reservoir plumbing for front dampers
JRZ RS systems benefit from 60 years of knowledge gained from supporting and developing ultra premium suspension kits for racers of all types.Double Adjustable Dampers
The RS PRO is a double adjustable damper which incorporates championship winning external reservoirs for maximum control. Compression and rebound adjustments are made independently from one another, allowing enthusiasts to calibrate their suspension from compliant street mode to taking the checkered flag. The RS PRO has 21 precise clicks of rebound adjustment controlled by a knob positioned at the top of the strut, and 14 precise clicks of compression controlled by a knob located on the external reservoir.Remote Reservoirs
The RS PRO line includes remote reservoirs for each of the 4 dampers. These external reservoirs significantly increase their performance capabilities by providing more fluid displacement and increased cooling capacity. The nitrogen pressure within the external reservoir can also be adjusted between 150 - 350 PSI; a key feature for track and race enthusiasts looking to fine tune their suspension to the highest degree.
Lines to each reservoir are long enough to comfortably mount them under the hood and trunk in a cool location that’s easily accessible. For a painless installation, all PRO kits come with front quick disconnect lines.Performance and Comfort
A unique compression blow off system is used to filter out large, high-velocity bumps you’d typically experience on rough streets or when attacking a berm on the race track using lower-end coilovers.Longevity
The shaft bearing has been upgraded for extended life between service intervals and to facilitate easier rebuilds. When you finally do need a refresh, JRZ has two partner service centers in the USA that can complete all necessary work.CNC Machining
The JRZ RS Line dampers use CNC machined internals that allow precise damping characteristics to be achieved. RS dampers are built on the same production line as the Motorsport line.Strut Coating
The McPherson struts from JRZ are made from high tensile steel to cope with the extreme side loads transferred from wheel to damper. JRZ applies a specialty black coating that is highly corrosion resistant, sourced from a cutting edge supplier.
Ground Control Camber Plates
Large and Easy Adjustment Range
- Typically adjustable up to -2º of camber
- Typically 3/4º of caster correction
- Urethane bushing reduces NVH while improving handling response
If you enjoy your car predominantly on the street, these plates are for you. These are ideal for those who carve back country roads, push their luck on the occasional freeway on-ramp, or attend a few autocross or high performance driving events (HPDEs) per year. There is no metal-on-metal contact within the street plates. Instead, they use a urethane bushing as opposed to a solid metal bearing (like the race plates) to mount the strut, so they transmit far less noise, vibration, and harshness (NVH) than the spherical-bearing Race plates. If you want the performance benefits of negative camber without the metal-on-metal suspension feel, Street plates should be selected.
Large and Easy Adjustment Range
- Typically adjustable up to -3.8º of camber
- Typically 1.5º of caster adjustment
- Spherical bearing provides direct and precise road feel
Whether you are new to performance driving and looking to improve your skills behind the wheel, or an experienced racer, Race plates will provide a broad-enough range of camber and caster adjustment to ensure your alignment settings are ideal for any performance driving environment, whether on or off the track. Ultimately, Race plates are best suited for drivers who prioritize performance and a direct steering response over all else. Like all components engineered to maximize performance, the genetic makeup of race camber plates may induce noise audible in the cabin. However, most of our customers prefer the adjustability and solid design of the race plates, and are happy with the trade-off, even on their street-driven cars.
We favor their design because unlike many camber plates, the Ground Control design doesn’t support the weight of the car on the same bearing that’s used for steering. Instead, the Ground Control design features a separate proprietary bearing dedicated solely to allowing articulation of the shock shaft without the added task of supporting the car. These spherical bearings are very under-stressed, which allows precise, consistent steering input while the weight of the car is supported by a completely separate articulating needle bearing.
Hyperco Coilover Springs
Pick from recommended rates or choose your ownLevel 1Level 2Level 3F: 450 lbs/in 5x2.25"
R: 700 lbs/in 7x2.25"F: 550 lbs/in 5x2.25"
R: 800 lbs/in 7x2.25"F: 700 lbs/in 5x2.25"
R: 1,000 lbs/in 7x2.25"
Spring kits include 5" front & 7" rear main spring lengths with a 2.25" ID.Level 1 Spring Kit
Ideal for daily driving and canyon carving while still delivering predictable handling you’ll enjoy on the occasional track day. Body roll and brake dive will be greatly reduced compared to stock or lowering springs. Passengers or clients likely won’t mind the increased stiffness.Level 2 Spring Kit
Ideal for the driver who makes frequent track visits, often using performance tire compounds, and may want to drive their car to and from the track. Body roll is reduced even further than with Level 1 spring rates. Also suitable for street use, but non-enthusiast passengers may not enjoy the increased stiffness.Level 3 Spring Kit
These are no-compromise race spring rates. Ideal for cars that see more miles on the track than on the street. This setup is for minimal body roll and maximum responsiveness, meaning on-track handling will be extraordinary at the expense of comfort on the street.Pick your own springs
Rate Range: 400 lbs/in - 1,400 lbs/in
Length Range: 5" - 8", 2.25" ID
Select the “custom” option when configuring your kit's spring rate to display the drop-downs for selecting rates and lengths for the front and rear independently. All springs will have 2.25” inner diameters to work with the provided JRZ and Ground Control perches.
Powerflex Polyurethane Rear Shock Mounts
Choose the right mount for your needs
To extract the most performance out of your high end dampers, it is vital to ensure there are no weak links amongst supplementary suspension components. These Powerflex polyurethane bushings replace the stock rubber bushings, and are designed to decrease the amount of deflection in your car's suspension which directly improves handling, driver feedback, and tire wear. Powerflex uses their own premium polyurethane formulation and durometer is standardized per fitment and location. The Street (yellow) option will significantly increase performance with minimal increase in NVH (noise, vibration, harshness), if any at all, while the Track (black) option is ideal for more serious performance and track use where enthusiasts are less sensitive to NVH.
JRZ Rear Ride Height Adjusters & Bump Stops
Included in every kit, these JRZ spring perches allow for precise rear ride height adjustment. They are machined from aluminum and anodized black.
To further increase service life and safe operating ranges specially designed bump stops and dust boots are included.
Weight Jacks replace the standard rear height adjusters, to address the issue of inconsistent spring rates. Rear springs aren’t compressed straight up and down. As the control arm articulates, the spring is compressed unevenly. These weight jacks use a pivot point to keep the spring vertical throughout the range of motion. As an added benefit, ride height can be adjusted with a socket from underneath without having to pull the wheel off. These parts are BMW CCA and SCCA IT legal.
Although not required, helper springs are used to keep the main springs seated on their perches while the suspension is at full droop. When cornering hard, going over a crest in the road, or jacking up the car, the suspension has the potential to droop enough for a spring to unsettle. If that happens it can seat incorrectly the next time it’s compressed. These are highly recommended for street cars if you want to avoid a lot of the suspension related noise that’s common with aftermarket suspensions.
As a wheel company, APEX is well aware of the importance of tire to suspension clearance. For that reason we try to avoid traditional helper or tender springs as they can add a lot of stack height to the suspension. Adding an extra spring and guide to the equation ultimately lowers the position of the bottom spring perch. Doing so can result in tire interference on many BMW models, especially when wide wheel and tire configurations are used. To keep the lower perch set as high up as possible, we’ve specifically selected Hyperco’s ultra thin helper springs which are significantly thinner when fully compressed compared to most other helper springs on the market. We’ve also sourced an ultra low profile aluminum guide to hold it in place. Their stack height is very short at approximately half an inch combined.
Apex Actual Price No Brand JRZ Vehicle Chassis BMW E82/88 1 Series Damper Type Double Adjustable with External Reservoir
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