► JRZ RS Coilover Package Group Buy - Hosted by APEX

[Eddy@ApexRaceParts]

Thank you everyone for your participation in our Group Buy. The deal is now officially closed, and was a huge success. We will continue to communicate with all pledged members of the deal, and look forward to transforming your car with these suspension upgrades.

Our fully customizable JRZ packages are still available directly on our website, at incredibly competitive prices. We currently stock the most BMW JRZ dampers in the country, giving us the ability to ship out most orders within 48 hours. Feel free to visit our website here if you are interested.

Update: We just launched another round! For more information regarding round 2 of our JRZ Group Buy, visit the link here here

-The APEX Team

[PbFut]

Damn it. And I have been doing so good at not spending money in 2018 on this bank account destroying hobby.

[jajou318]

Damn it. And I have been doing so good at not spending money in 2018 on this bank account destroying hobby.

You don't need em, you want em.

[trkshoe]

No... U need 'em :-)

[Eddy@ApexRaceParts]

”What makes JRZ so special, and which damper from their RS Line is best for me?”

Since APEX first released these custom suspension packages built around JRZ RS dampers, these have been the two most prominent questions proposed to our Product Experts. This is usually followed up with, “what spring rates, rear shock mounts and other accessories should I choose”.

As car enthusiasts we all share a passion for a specific marque, but often times that is where common ground ends. Even within our tight knit team of car enthusiasts here at APEX, it is clear that these cars are enjoyed in different ways, and we each have different goals, opinions, and expectations on how a car should or shouldn't be modified. This sentiment has stuck with APEX over the last 10+ years, and has been a driving force behind offering the community a wide array of wheel fitments that specifically met the diverse performance and budgetary needs of our customers. Forcing limited “cookie cutter” wheel fitments onto a diverse audience meant compromises would have to be made along the way, and that was quickly something that APEX navigated away from. In more recent years, this theme continues with our suspension solutions.

APEX hand picked race proven suspension components from three industry leading manufactures to create fully customizable coilover packages, and with JRZ’s 60+ years of experience in development and production of Motorsport grade dampers, we knew the JRZ RS line would provide our customers with the right foundation for each configured kit.

Back to the Basics

Before we dive into the details and differences of JRZ RS dampers available to us, let's review some basic suspension principles at a high level. In order to make an informed purchase decision, it is important to have a general understanding of the different components that make up a coilover, as well as the job of supporting suspension components. This is best explained by Motorsport guru Jay O’connell featured in the SAFEisFAST series, and we’ve compiled cliff notes below.

1. Springs

• Springs are the load bearing device essentially keeping the car off the ground
• Spring rate is the measure of how stiff the springs are, or how much force it takes to deflect them a certain distance
• There are many factors contributing to choosing the right springs rates, but the primary factor is that you need springs stiff enough to hold the car off the ground under the aerodynamic loads it sees
• Ideally you would run the softest springs you can get away with. The softer the springs, generally the more grip you can get out of the tires - Just stiff enough for the aerodynamic load that your car sees
• Higher spring rates where the speeds are high and there is more aerodynamic forces at play (track configuration and whether or not a car has aero)
• Softer spring rates where the speeds are quite low and there is less aerodynamic forces at play (track configuration and whether or not a car has aero)

2. Dampers (Shock absorbers)

• The dampers main job is to control the release of energy that is stored in the spring due to the weight on them. They are the most important component for controlling the mass and movement of the car so that you can get as much grip out of the tires as possible
• When a car drives over uneven surfaces all the energy in the compressed spring wants to come out fast, so the dampers job is to control that release of energy so that the car does not have a big response by the bump. We want to minimize the drama!
• Uncontrolled motion from worn out shock absorbers will take away from grip - upsetting the car

3. Damper Adjustments

• Rebound - Controlling the energy release out of the springs when the wheel & tire move away from the body - shock is expanding
• Compression/Bump - Controlling the movement of the wheel & tire moving up into the body/suspension - shock is contracting

4. Bump Stops

• In place to protect the dampers from the suspension running out of the travel or bottoming out. With these in place, you can feel a little more comfortable running a lower ride height without stiffening the springs because the bumps will “catch the car” before they hit. With that said, you do not want to be riding on the bump stops, as this indicates the car is running out of travel.

5. Anti-roll Bar

• The main function is to reduce chassis roll. If you can reduce chassis role, you can maintain the camber angles of the tire in relation to the ground to give you more grip throughout the lap. It’s a quick way to tune the balance of the car
• Stiffening the front anti-roll bar you will get more understeer
• Stiffening the rear anti-roll bar you will get more oversteer
• If the car is understeering, the first thing to do is to soften the front anti-roll bar to get some grip back into the front tires. Conversely you could stiffen the rear anti-roll bars and take some grip away from the rear, but now you are just hurting the end that is already well hooked up. Generally you want to fix/tune the end of the car that has has the problem first.
• With each understeer/oversteer condition, there are multiple ways to fix it. You typically start with anti-roll bars, however you can then get into spring rates, damper settings and rake and that is when things can get somewhat complicated. Adjustments to correct a problem may cause a new problem to rear its head.

Moving in the Right Direction - JRZ RS Dampers

Quite often aftermarket suspensions targeted at car enthusiasts are not actually improving the handling capabilities of your vehicle. There’s never a shortage of “lower grade” dampers or coilover packages on the market disguised in enticing packaging with fancy marketing, so it is important to know the genetic makeup of what you are buying. When I ask customers to identify some of the key features they would like out of their new suspension, height adjustability is commonly the first answer. The ability to adjust vehicle ride height is desirable for a few reasons beyond getting rid of that unsightly wheel gap, however this is a standard feature of any coilover design and you owe it to yourself to set the bar much higher.

Premium grade coilovers are designed around quality dampers built for a specific operating range of spring rates, and these two components are co-developed to ensure maximum control over the vehicle's movement while it negotiates uneven road/track surfaces. The end goal is to reduce drama transmitted to the chassis, prevent loss of tire traction / maximize grip, and to keep things consistent and predictable for the driver. This is not to be confused with suspension that is overly stiff - a common misconception amongst car enthusiasts. Needless to say, not all coilover packages are created equal.

The JRZ RS-Line is hand built on the same production line as their ($8,000+) red motorsport-grade dampers. The build quality and attention to detail is second to none, and this is apparent from the moment you open the box and begin to handle the components. Every piece is anodized, leaving no uncoated corrosion-prone surfaces. Because the dampers are made by hand, each and every set is reviewed by a craftsman/craftswoman to ensure consistent quality, and personally signed off before making its way to you.

• Performance & 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.
  
  
• Feel The Change - Damper adjustments are highly intuitive compared to other brands. Each "click" of adjustment is felt with high precision not only by your fingers as you adjust rebound and compression settings, but also to the driver as the car is put through its paces. If you geek out over suspension like we do, this makes experimenting and dialing in your JRZ suspension a bit of fun.

The Golden Question - To What Degree do you Want to Tune Your Suspension?

Through conversing with a broad spectrum of customers, this is the major fork in the road. We can all agree that we would like our aftermarket dampers to significantly improve the handling characteristics of our vehicle, but to what degree are you willing and able to fine tune your dampers to optimize results given your vehicle setup, intended use, driving style etc.? Since dampers are the centerpiece to any high performing suspension package, it is important lay everything out on the table before making a decision. What are your long term goals for the car? Do you desire to compete in a form of class racing or time trials where the governing body imposes restrictions and guidelines? These are things to consider to ensure you are satisfied with your purchase in the long run.

I want to be clear that all JRZ RS dampers are very capable, and with the right supporting suspension components and chassis alignment they will dramatically improve the drivers ability to control the vehicle. The question is, how involved do you want to be? As we move through the different RS dampers available, each increases your ability to fine tune the suspension in a more granular way. The ability to externally modify damping characteristics is a desirable feature, particularly for those in continuous pursuit of improving lap times or beating out the competition. These enthusiasts and racers alike will go through the effort of adjusting rebound, compression and even external reservoir nitrogen pressure to compensate for tire wear, variations in track surfaces leading to poor or inconsistent levels of grip, and even in some instances driver errors.

RS ONE - Single Adjustable Dampers


The RS ONE is a single adjustable damper with 21 precise clicks of adjustment, and valving capable of handling a broad range of spring rates. Through the twist of one knob, JRZ strikes a balance of adjusting both rebound and compression together. Moving between comfortable street use, aggressive track mode, or anything in between has never been easier. The RS ONE design minimizes complexity, while still providing a significant increase in performance. If you are not the type of enthusiast to explore different spring rates, alignment settings or other chassis setup features on a continuous basis, and prefer to get a capable suspension as close to “set it and forget it” as possible, the RS ONE dampers are the perfect solution.

RS TWO - Double Adjustable Dampers


The RS TWO is a double adjustable non-remote damper which offers independent compression and rebound adjustment. Having both compression and rebound adjustability independent from one another allows users to make more precise inputs to find the balance they are looking for. The RS TWO 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 positioned at the bottom of the strut.

Whether you are interested in getting slightly more involved in the suspension tuning process from the get go, or ensuring you have the option to get more granular with suspension adjustments as you become a more experienced driver, the RS TWO has you covered without the added complexity of external reservoirs.

RS PRO - Double Adjustable Dampers


The RS PRO is a double adjustable damper which incorporates championship winning external reservoirs for maximum control. Like the RS TWO, 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.

If you are a suspension geek, serious track junky or competitive racer, the RS PRO is an extremely effective weapon. These dampers and external reservoirs are aimed at enthusiasts who will take the time to explore and document a variety of spring rates, alignment settings and other chassis setup features all in the name of pushing their cars and their skills to the limits. The value added from the external reservoirs is listed in the "remote reservoir" section below.

RS PRO 3 - Triple Adjustable Dampers


The RS PRO 3 is JRZ’s flagship triple adjustable damper for the RS line, which incorporates championship winning external reservoirs for maximum control. The RS PRO 3 has 21 precise clicks of rebound adjustment controlled by a knob positioned at the top of the strut. It also has 14 precise clicks of high speed compression and 8 precise clicks of low speed compression, both controlled by knobs located on the external reservoir.

Independently tuning high and low speed compression allows track junkies and competitive racers alike to get the absolute most out of their suspension. Double adjustable suspensions do not allow users to isolate and control high and low speed compression damping. Low speed compression controls the speed at which the suspension compresses while the car negotiates small bumps, and prevents wallowing. High speed compression controls the speed at which the the suspension compresses while the car negotiates quick or abrupt movements, like hopping berms or drastic changes in the road surface.

Although more adjustments can add a level of complexity to the end user, it is important to note that you can set low speed compression to full stiff, and the damper will now behave the same as the RS PRO double adjustable suspension. As you develop the car over time and become more familiar with fine tuning the suspension, you can then make adjustments to the low speed compression to find the perfect balance for your specific track surface(s). The RS PRO 3 is the ticket for hard core track enthusiast and competitive racers looking for any and every available edge over the competition. The value added from the external reservoirs is listed below.

Remote Reservoirs - Applicable to RS PRO & RS PRO 3
External reservoirs significantly increase performance capabilities by providing more fluid displacement and increased cooling capacity. Track enthusiasts and racers push their cars to the limits, and external reservoirs are one of the key ingredients to consistent damping performance from the starting line to the checkered flag. 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.



Some enthusiasts within the BMW community have years of experience and seat time under their belt, and with good information available to them, they are able to digest it with relative ease and make good purchase decisions. For many others it can be information overload, and therefore we recommend having a one on one consultation with an APEX Product Specialist to further discuss personal goals, expectations and budget. We may not have all the answers, but working closely with JRZ, Ground Control and Hyperco allows our staff to deliver top notch customer support, pre and post purchase. Keep in mind, configuring a suspension package and installing it on your vehicle is only half the battle. To get the most out of your new purchase, you’ll want to know that experts are there to support your efforts along the way.

Next up we’ll be taking a closer look at our Ground Control adjustable camber plates and rear shock mounts, baseline E46 street and track alignment suggestions, as well as a deeper dive into our Hyperco linear race springs, helper springs and guides. Stay tuned!

- Ryan

[Eddy@ApexRaceParts]

We’ve seen quite a few people asking about independent reviews of the JRZ suspension systems. After some quick searching via the forums and Google, we have compiled a short list of independent reviews for your reference.

Many of these reviews come from trusted members of the BMW community. Some consider themselves a novice, while others have personally tested and experimented with a multitude of different suspension setups, only to finally land on JRZ as the answer to their needs. These reviews will touch on different parts of the ownership process starting with the excitement that comes with unboxing the product, through the installation process and first impressions, and then ultimaltey some longer term feedback after the car is put through it's paces.

Money2536's Review of JRZ RS Sport Two/Fall Line Suspension Upgrade
(TONS of amazing pics and video. Some beauty shots next to a KW kit for size comparison as it really shows why KW requires spacers!)

https://f80.bimmerpost.com/forums/sh....php?t=1222708

A Novice's Review of JRZ RS ONE TOURING

https://f80.bimmerpost.com/forums/sh....php?t=1317569

Suspension dilemma: KW or JRZ?

https://www.m3post.com/forums/showthread.php?t=731846

Review | JRZ Suspension Engineering RS Pro

https://www.m3post.com/forums/showthread.php?t=1059632

JRZ RS Two Touring/Sport Track Review

https://f80.bimmerpost.com/forums/sh....php?t=1297051

[Eddy@ApexRaceParts]

JRZ has a rich heritage of supporting many different vehicle marques, and a laundry list of podium finishes and noteworthy accomplishments in professional levels of Motorsport. Here is some good feedback from real racers and successful race teams within the Porsche racing community at the 48hours of Sebring - an event JRZ is no stranger to.

JRZ Suspension Engineering 2012 at the 48h of Sebring - YouTube

[Eddy@ApexRaceParts]

We are down to the last seven days of this Group Buy. We’ve made great progress so far, but it’s crunch time and we need everyone’s participation to make this deal a success. With 44 members expressing interest so far, it is totally feasible to reach one of the top tiers offering massive discounts, but we need everyone to return to the deal page to confirm their official pledge. We are accepting new pledges up until Sept. 12th at midnight.

Whether you are planning to install aftermarket suspension on your car for the first time, or replacing another brand that failed to provide you with the performance you were looking for, this is an extremely rare opportunity to acquire a premium grade coilover package at prices that are simply unheard of. You don’t want to miss out on this one.

Our suspension experts have created a helpful suspension buyers guide which can be viewed on our APEX blog, and we are also available for one-on-one consultations.

-The APEX Team

[BimmerBreaker]

Im intrigued but have any of these kits been tested on the fickle Z platform, or is it just theory and math that determine the suspension tuning?

[Eddy@ApexRaceParts]

Major Update Everyone,

Thanks to JRZ, we are reactivating this Group Buy for a second chance at hitting the max discount as they just approved a major improvement to the deal.

Formerly, this deal required 50+ pledges to unlock the top discount tier of 20% off. Since the “interested” list did not surpass that marker, we believe many of you sat on the sidelines and didn’t pledge knowing the most attractive discount was not possible to reach. We reviewed the results with JRZ and they agreed to lower the requirement for the top 20% off tier down to just 21 pledges! That is less than half of the original requirement, and with 17 members already pledged, we only need 4 more to seal the deal.

This change is applicable to everyone. The deal has been reactivated until this Thursday, September 20th at 11:59 PM Pacific. After that time the deal is 100% done and closed.

Interested Members: Revisit the deal page, and enter your pledge asap. There are more than twice as many of you interested as needed to reach this discount now.

Pledged Members at 12% off or higher: You are not currently a buyer since we didn’t reach your goal. You’re already pledged though, so no further action is needed from you. If we can add 4 more pledged members by Thursday then you’ll become a buyer at 20% off unless you choose to cancel your pledge before then.

Pledged Members at 10% off: No action is required. If we reach the 20% discount level, your order will automatically get upgraded to the better discount. If we can’t reach that discount then your order will continue to process as scheduled at the 10% off discount. This brief extension will not result in any shipping delays.

Newcomers: You are welcome to join in still. Visit the deal page and pledge now.

If you have an E36, E46, Z3M or E85/6 Z, this is the best opportunity to acquire a fully customizable coilover package surrounding premium JRZ dampers that we’ve ever seen.

- Team APEX

[Eddy@ApexRaceParts]

You Did it, Max Discount Achieved!

It has been a wild ride, but we are very excited to announce that we have received enough pledges from the community to officially unlock the 20% off max discount tier.

The Group Buy will be accepting new pledges up until tonight at 11:59 PM Pacific, after that time the deal will be 100% closed. For anyone in the market for a premium suspension package, this is an absolute no brainer at a guaranteed 20% off.

Our staff of Product Experts will be reviewing and responding to any incoming correspondence through the end of this deal. If you have any last minute questions feel free to send a private message, or post in the public discussion tab on the GangUp deal page.

Congratulations to everyone, and great work making this deal a massive success.

- APEX Team

[Chamberlin]

Im intrigued but have any of these kits been tested on the fickle Z platform, or is it just theory and math that determine the suspension tuning?

I had the same thoughts, and even at the 20% discount I backed out due to high price vs. the unknowns on the M Coupe. Looks like they sold a few sets, so I suppose there'll be some data points out there soon enough.

[E34nication]

Bumping this... picked up an e36 after this group buy ended. If anyone bought in and is having second thoughts shoot me a PM.