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      10-04-2018, 10:02 PM   #1
GrayM4
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JRZ Group Buy for F8X, F3X, F2X - lowest prices

Bimmerpost fam Ė

I wanted to draw your attention to the JRZ suspension group buy hosted by forum sponsor Apex. Apexís last JRZ suspension group was at a 20% discount! Iíll be participating and am hoping many of you do so we can collectively maximize the savings.

For more info on the group buy: JRZ RS Coilover Packages: BMW F8X, F3X, F2X: https://www.gangup.com/apex/jrz-rs-f...2-q3-2018.html

Note that Apexís JRZ suspension packages are fully customizable with different spring rates and come with Ground Control camber plates.

I highly encourage you to consider JRZís and participate in the group buy. My M4 is a dual-purpose car that is driven to work daily and tracked on the weekends. While I was initially in search of coilovers that would offer best-in-class handling dynamics/steering feel/grip, I was pleased to read many forum members reporting improved ride quality/smoothness which is something I can also enjoy daily while commuting. I personally experienced this riding in forum member and JRZ factory-supported driver Tom Tangís M3. Thanks Tom! See Tomís write-up and review's:

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

http://www.jrzsuspension.com/rs-pro-3-continued.html

In the past, the cost of JRZís has held me back from equipping my M4 and getting the most out of the car. As far as Iím aware this is the best price in the country for JRZís.

Please share with your F8X, F3X, F2X buddies!
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      10-05-2018, 06:03 AM   #2
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Do you know if these dampers come with prewelded brackets for the acceleration sensor on the side of the shock? I noticed that in the picture there is only one mounting point (for the end links)
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      10-05-2018, 03:41 PM   #3
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Quote:
Originally Posted by GrayM4 View Post
Bimmerpost fam –

I wanted to draw your attention to the JRZ suspension group buy hosted by forum sponsor Apex.
We greatly appreciate your support GrayM4

Quote:
Originally Posted by Donger Kim View Post
Do you know if these dampers come with prewelded brackets for the acceleration sensor on the side of the shock? I noticed that in the picture there is only one mounting point (for the end links)
Edit 10/8 More clarification added. We too mixed up the acceleration sensor with the carrier that holds the brake lines.

Donger Kim,

Great question. The acceleration sensor located on the side of the factory damper is only relevant to the factory adaptive suspension. When enthusiasts install aftermarket suspension, this sensor is no longer needed and is removed along with the factory strut assembly. While a malfunction error notice will be displayed on the dash following its removal, JRZ's optional cancellation units or aftermarket coding can remedy this. It is important to note that the malfunction error notice will not compromise or hinder the performance of your aftermarket suspension in any way, but most enthusiasts opt to remove/clear it as it can be a bit of an eyesore.

I have included two images below for your reference. The first image is of the acceleration sensor itself, and the second image shows its orientation to the factory dampers (#11). The second image also shows the bracket/carrier for the brake lines (#6), which is reused with the JRZ suspension in place and attaches at the clamshell using the factory hex bolt (#5) and hex nut (#7).





Here is an image of one of the JRZ EDC cancellation units. Four components come with the optional upgrade, each plugging into one of the four corners of the vehicle.


Last edited by Expert@ApexRaceParts; 10-08-2018 at 03:41 PM..
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      10-05-2018, 06:19 PM   #4
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Originally Posted by Expert@ApexRaceParts View Post
We greatly appreciate your support GrayM4



Donger Kim,

Great question. The cable itself goes on a bracket that you can re-used from the factory suspension which is bolted to the strut housing. The accelerometer itself can be fitted like OEM to the damper. I have attached two images for your reference.





The 2nd picture was very helpful!! Thank you!
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      10-05-2018, 06:36 PM   #5
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The 2nd picture was very helpful!! Thank you!
No problem Don't hesitate to reach out if there are any other questions you might have.
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      10-06-2018, 02:04 PM   #6
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Technically that's the wheel speed sensor and not the acceleration sensor. The acceleration sensors would be removed along with the factory dampers and not reinstalled with the jrz.
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      10-06-2018, 05:26 PM   #7
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Originally Posted by jww///95 View Post
Technically that's the wheel speed sensor and not the acceleration sensor. The acceleration sensors would be removed along with the factory dampers and not reinstalled with the jrz.
Why donít passive suspensions not have this sensor then?
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      10-06-2018, 06:12 PM   #8
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Quote:
Originally Posted by Donger Kim View Post
Quote:
Originally Posted by jww///95 View Post
Technically that's the wheel speed sensor and not the acceleration sensor. The acceleration sensors would be removed along with the factory dampers and not reinstalled with the jrz.
Why don’t passive suspensions not have this sensor then?
Acceleration sensors are present only in support of the factory adaptive suspension. The jrz and other dampers are effectively adaptive deletes.
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      10-06-2018, 07:41 PM   #9
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Quote:
Originally Posted by jww///95 View Post
Acceleration sensors are present only in support of the factory adaptive suspension. The jrz and other dampers are effectively adaptive deletes.
Just want to clearify, if you code out the acceleration sensors, what are the downsizes/functions do you give up? I think my understanding of them isnít very great because as far as i know, it only tells the car if itís on a incline/decline + if the car is upside down lol
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      10-06-2018, 07:57 PM   #10
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Quote:
Originally Posted by Donger Kim View Post
Quote:
Originally Posted by jww///95 View Post
Acceleration sensors are present only in support of the factory adaptive suspension. The jrz and other dampers are effectively adaptive deletes.
Just want to clearify, if you code out the acceleration sensors, what are the downsizes/functions do you give up? I think my understanding of them isn’t very great because as far as i know, it only tells the car if it’s on a incline/decline + if the car is upside down lol
You're confusing the acceleration sensors which are specific to adaptive edc functionality with the height position sensors which are used for vertical headlight aiming and are attached to the control arms (1 for front axle and one for rear). These are not at all related to damper function.
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      10-07-2018, 09:47 PM   #11
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Quote:
Originally Posted by Donger Kim View Post
Just want to clearify, if you code out the acceleration sensors, what are the downsizes/functions do you give up? I think my understanding of them isn’t very great because as far as i know, it only tells the car if it’s on a incline/decline + if the car is upside down lol
Quote:
Originally Posted by jww///95 View Post
You're confusing the acceleration sensors which are specific to adaptive edc functionality with the height position sensors which are used for vertical headlight aiming and are attached to the control arms (1 for front axle and one for rear). These are not at all related to damper function.
What jww///95 said.

The sensors that are mounted to the struts are used with the OEM M-Adaptive dampers. When you install a coilover kit (JRZ included), you essentially have no use for these any more because the coilover kit can't use them. Instead, the new coilovers are adjustable dampers that are adjusted manually with a dial/knob. Exceptions are KW DDC and Tractive Coilover kits but that's another topic.

The reason why people have said to "code it out" is because once the coilover kit is installed, you have no more adaptive suspension (EDC). And since your car came with the adaptive suspension, it will give you an error. You code it out to get rid of the annoying error notification.

I knew I was going to get coilovers (in fact my JRZs arrived before my car did), so I didn't pay for the M-Adaptive Suspension. Those who did and then chose to go with a coilover kit essentially wasted money.
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      10-08-2018, 02:35 PM   #12
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Quote:
Originally Posted by exo-shell View Post
...Those who did and then chose to go with a coilover kit essentially wasted money.
At least in the US market, adaptive became standard around the time of the LCI so you wouldn't have paid extra for it upfront (the de-optioning of adaptive doesn't credit back any $) you just have the extra step of coding it out now for non-adaptive aftermarket suspension installations.
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      10-08-2018, 07:11 PM   #13
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Quote:
Originally Posted by jww///95 View Post
Quote:
Originally Posted by exo-shell View Post
...Those who did and then chose to go with a coilover kit essentially wasted money.
At least in the US market, adaptive became standard around the time of the LCI so you wouldn't have paid extra for it upfront (the de-optioning of adaptive doesn't credit back any $) you just have the extra step of coding it out now for non-adaptive aftermarket suspension installations.
Oh. Didn't know that little tidbit. That's actually pretty cool that LCI owners have the option of keeping the EDC+HAS vs going full coilovers.
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      10-09-2018, 04:48 PM   #14
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How many pledges are required for any kind of discount?
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      10-09-2018, 08:51 PM   #15
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      10-10-2018, 03:44 PM   #16
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Thank you for posting that Bravehart. After running a successful deal last month with the E36/E46/Z community which hit the max discount tier, we believe the discount tiers have extremely reasonable participation requirements.

To keep the technical discussion flowing, here is an article I wrote which some of you may find helpful.



”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 manufacturers 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 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 a 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 to 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 driver's 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.

- Ryan
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      10-12-2018, 01:29 AM   #17
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Thanks Braveheart!

Glad to see the level of interest and discussion taking place. Counting me (need to switch interest to pledge on the group buy page) there are 5 people interested so we're at 10% discount so far.
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      10-15-2018, 10:05 AM   #18
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ctgeorge time go go after those 911's?
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      10-23-2018, 11:58 AM   #19
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I'm interested. Just bought some rims that I'm sure will need a coilover setup to fit.
Need guidance on spring rate and camber plate type. Thanks
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      10-23-2018, 01:13 PM   #20
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Originally Posted by Mmvic View Post
I'm interested. Just bought some rims that I'm sure will need a coilover setup to fit.
Need guidance on spring rate and camber plate type. Thanks
Thanks for the post! There are many factors which will determine the best options for your specific car and how you intend to use it.

For camber plates, we offer only one type for the F8x platform. The Ground Control Touring camber plates are a newer design which leans on the F8x platform's superior noise isolation compared to older cars. This means a separate urethane-bushing "street" plate option is not necessary.

The touring plates are intended for both street and track use, and you can find out more about them on our website here.

Regarding spring rates, we've worked extensively with JRZ to put together 3 'Levels' of spring setups that should cover the majority of use cases (text below copied from our website):

Spring lengths (without helper springs)
Front: 6"
Rear: 7"

Level 1
Front: 500 lbs/in; Rear: 750 lbs/in
Ideal for daily driving and canyon carving while still delivering predictable handling youíll 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 wonít mind the increased stiffness.

Level 2
Front: 700 lbs/in; Rear: 900 lbs/in
Ideal for the driver who makes frequent track visits, often using performance tire compounds, and may still 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
Front: 800 lbs/in; Rear: 1,000 lbs/in
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.

Of course, we are able put together custom-rate spring setups as well. Feel free to call or PM us to discuss your ideal setup!

--Dylan
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      10-23-2018, 02:10 PM   #21
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Location: Palm city fl

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Thanks for the info, very tempting
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      10-24-2018, 01:46 PM   #22
Mmvic
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Drives: M3
Join Date: Oct 2018
Location: Palm city fl

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3 bolt or 5 bolt strut?
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