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KW Suspension Factory Tour

Industry Insider: KW Suspension Factory Tour Part 2

By Mike Kojima, photos by Jeff Naeyaert

In our last installment we left you deep inside KW Suspension's wonder factory.  So far none of us has fallen into the shock fluid, turned purple and round, been sucked into TV's or mauled by squirrels. Now lets rejoin the tour!

To Read Part One Click Here!

 

 KW Suspension Factory Tour
 Piston rod assemblies await stuffing into a strut tube.
 KW Suspension Factory Tour
 More piston rods and strut inner tubes with their process travelers.
 KW Suspension Factory Tour
Foot or base valve controls the compression damping.  The brass colored bottom knob allows for externally adjustable damping.  The valve goes on the bottom of the inner tube and controls the fluid flow between the inner and outer tube.
KW Suspension Factory Tour
The adjustable part of the rebound valve in the piston.
KW Suspension Factory Tour
The piston rebound adjustable valve with the adjusting rod that goes through the shock shaft.

 

 

 

KW Suspension Factory Tour
More rebound valves in the foreground assembled on piston rods in the background.
KW Suspension Factory Tour
More examples of bespoke assembly fixturing.

 

Sub assemblies like valves are assembled in cells and inventoried according to calibration.  When a shock is assembled, the sub assemblies like base valves and piston/rods are brought together from inventory via automated conveyor belts and assembled into a shock in a manufacturing cell.  Fluid is added and the shock is pressurized. After assembly, every single shock is inspected and run on a shock dyno with the results being recorded.

 

KW Suspension Factory Tour
All shelving and containers at KW are standardized to DIN standards.  This not only makes things efficient but saves space and allows for many parts to use an automated picking system to speed production and parts handling with fewer people.
KW Suspension Factory Tour
Automated conveyor belts move parts from assembly station to station within the plant.  This reduces the amount of forklifts, handling and lifting done by people.  This goes a long way towards making the plant safer and more efficient.
KW Suspension Factory Tour
Major assemblies have computerized assembly instructions and process documentation.
 KW Suspension Factory Tour
 Sub assemblies being assembled into a complete strut assembly.
 KW Suspension Factory Tour
 Fluid is added and the shock is pressurized.
 KW Suspension Factory Tour
 A newly completed Variant III awaiting final inspection and dyno testing.
KW Suspension Factory Tour
Every single shock and strut is dynoed to confirm proper assembly and operation.
KW Suspension Factory Tour
The actual damping curve measured by the dyno is compared to what it should be and the shock is either accepted or rejected.

 

Not only OEM parts are assembled with such care but also every single coilover kit that KW makes, whether an aftermarket street kit or not is subjected to the same stringent quality standards and testing.  If you are looking into a suspension kit, we can assure you that you are getting something assembled with utmost care with a company whose culture is continuous improvement, using the latest tools and methods in industrial quality control, verified by third party audits.

KW Suspension Factory Tour
A new KW upcoming product, a hydraulic lift system so lowered cars can go up driveways etc, without damage.  The system raises the car by a couple of inches in seconds.

 

KW Suspension Factory Tour
It's all in the label.  This sticker has the serial number that enables KW to trace the production of the shock down to the very base materials and operators.  This is super important if troubleshooting a process is needed due to warranty issues.  This traceability is an ISO/QS requirement.

 

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Comments

8695Beaters
# 8695Beaters
Monday, November 08, 2010 4:41 AM
I'm sold, my Undergrad Research money is going towards a set of V3s for my S13. I can't wait to drive my car with a smooth ride, no bumpsteer, and no harsh impacts and bottoming out. All the attention to detail, and the fine precise machining is to die for.

I didn't see anything on the bumpstops KW uses. What do they use for bumpstops and where do they place them in the strut assembly?
Wrecked
# Wrecked
Monday, November 08, 2010 6:18 AM
Is any inaccuracy created due to the wheels being stationary (not rotating) on the 7 post rig?
240Z_Master
# 240Z_Master
Monday, November 08, 2010 8:57 AM
I've heard through the grape vine that they are producing S30 coilovers in the future! I want them!
Mike Kojima
# Mike Kojima
Monday, November 08, 2010 9:01 AM
Beater, KW uses a soft MCU type bumpstop.
Wrecked, there probably are some effects from the wheels not rotating but its more how the wheels behave off axis.
Master, its true and the AE86 too!
Der Bruce
# Der Bruce
Monday, November 08, 2010 9:22 AM
When KW and you were talking about fine tuning suspension, how much of a difference does it make when you switch out tires and wheels?

For example, you switch out from your daily drivers to your weekend warrior combo that's, let's just say, 10lb less per wheel. Doesn't the compression and rebound act differently, with the different parameters?

PS. Were you guys carving your way through SEMA last week getting us some good stuff?
mx5
# mx5
Monday, November 08, 2010 11:05 AM
Mike, KW had a V3 prototype for first and second gen Miatas (1990-2005) which was on Matt Andrew's car and got stolen few years ago. Nothing from KW about V3 since then. Do you know if anything is in the pipeline?
Seb@SZ
# Seb@SZ
Monday, November 08, 2010 6:41 PM
Mike,

What's the ETA for the Z32 V3s?

Seb
Mike Kojima
# Mike Kojima
Monday, November 08, 2010 9:40 PM
Bruce, switching out tires and wheels with a different mass makes a feelable difference. You can tune it with the shocks damping adjusters.

MX5, Matt's car had some hand built motosports dampers and SCC was told that they were V3's. KW does not believe that the Miata is a serious performance platform and they only make V2's for them I think. Not knowing the Miata scene, do you think 50 sets of V3 could be easily sold?

Seb, we have the proto V3's for Z32 I just have to test them and play around with the spring rates and valving. I am super busy with Superlap battle, RTA and Gymkana coming up so it will probably have to wait until early 2011.
mx5
# mx5
Tuesday, November 09, 2010 1:48 PM
@Mike - I don't think there is V2 for Miatas either. There are over 1 million Miatas sold between 1990 and 2005 and over that peroid suspension-wise it is pretty much the same car. Since the platform is relatively cheap to maintain and the suspension geometry is way way better (double wishbone front and rear) than majority of the cars in the price range, there are lots of Miatas at pretty much any autocross or track day one goes to. Suspension and light weight are Miata's two strong point and that's where most Miata track day junkies invest most. I think KW would sell much more than 50 kits. It is just interesting that KW skipped that market. Have you paid attention to what the 949 racing did with the 6UL wheels? Custom 9" wide fit for a Miata and they sold thousands. So many, that Tire Rack followed and made custom Miata wheel to not miss the market ...

Even things like this one sell ;)
http://949racing.com/xidacoilovermiata.aspx



Mike Kojima
# Mike Kojima
Thursday, November 11, 2010 9:59 PM
What do you think of coming out with a more hardcore Club Sport, track day oriented suspension?
Arnie
# Arnie
Saturday, November 20, 2010 3:27 AM
Mike, once again, awesome insight into this company. Great work.

In regards to their Motorsports dampers using low pressure oxygen, how do they keep the oil from cavitating? Wouldn't the use of low pressure oxygen be more susceptible to cavitation compared to high pressure nitrogen?
Arnie
# Arnie
Saturday, November 20, 2010 5:09 AM
Another question in regards to spring rate choice for their setups. Many coilover manufacturers only make coilovers and not the complete compliment of swaybars, etc. They often ramp up spring rate for roll control rather than taking into account that the end user is throwing a larger swaybar into the equation. Does KW take this into account when specing their spring rates? i.e. using a lower spring rate if they know you are using uprated bars, etc.?
Mike Kojima
# Mike Kojima
Saturday, November 20, 2010 10:01 PM
The valving is designed to operate at 100-150 psi.
Markingtime
# Markingtime
Monday, December 20, 2010 12:25 PM
Thanks for taking the bullet for the rest of us in getting this great information. I'm sure it was a real hardship. I've been trying to find this level of information on them for some time.

My car came stock with electronically adjustable dampening force control from the cab. Although it only has two settings, I really like the feature because I can change it on the fly but it is nearing the time for an upgrade. I have been considering KW for some time now because of their incredible quality and their available cab controlled ride height adjustment (which I desperately need), but they don't have the option to have electronically adjustable dampening force control on the fly in the cab like Tein. Is there any indication from KW that they are working on adding such a system? I don't want to try to put KW's ride height adjustment system on a competitor's product, assuming it is even possible, and I can afford to hold off a while if it was something they were working on.

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