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KW V3. springs to linear?

Hey guys I'm purchasing Cup Kits for the front coilovers from https://www.stanceparts.com/air-cup-lift-system/ , it says i need to use Linear springs. Since the springs on the V3 coils upfront are

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Old 04-24-2018, 04:21 AM   #1 (permalink)
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Default KW V3. springs to linear?

Hey guys

I'm purchasing Cup Kits for the front coilovers from https://www.stanceparts.com/air-cup-lift-system/, it says i need to use Linear springs. Since the springs on the V3 coils upfront are progressive is there a suitable replacement that you guys know of that would help me here? Preferably that isn't too expensive and maybe functions just as well as the spring im replacing?

Note: Just some requirements based on what the site says.

Quote:
High spring rates
If you're using extreme high spring rates, higher than the original rates that came with your coilovers, then it's possible that you can't use the full 50mm lift from the air cups. Due to the extreme high spring rates, the weight of the car won't compress the springs and damper enough to create a stroke for the air cups to lift. This can be solved by using helper springs.

DIMENSIONS
• The diameter of the air cup is 120 mm.
• The fitting is 17mm.

The air cup is only 20mm thick in the lowest position. Depending on your coilovers and vehicle, the air cups will take up a certain space. In most cases this is 20 to 30mm. If you have enough travel left on your coilovers to lower it, it won't be a problem. If not, you can install shorter springs to compensate this
If someone could suggest me some springs i can use that still fit within the few requirements listed, i would really appreciate it!

Last edited by Asus_; 04-25-2018 at 04:00 PM. Reason: fixed a typo
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Old 04-24-2018, 11:33 PM   #2 (permalink)
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I'm guessing that was a typo on your part, but it says you can ONLY use linear springs. You need a 60mm or a 2.5inch diameter spring with an max O.D of 99mm.

Your best bet is a 7inch spring with a nominal spring rate anywhere from 400-900ib/in. I don't suppose you plan on pulling anymore than 1G of lateral force often, so this shouldn't be a problem.

You'll subsequently need to change your rear spring rate as well or your balance will be off substantially. You'll be chasing damper rate problems until you shoot yourself in the head if you don't.

Good luck
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Old 04-25-2018, 07:34 PM   #3 (permalink)
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I tried calling KW again, spoke to another rep and this is the info i got, It's possible to put linear springs but i need to buy the following . . .

- springs inner diameter is 61mm
- apparently i need to to buy tophats?
- they say i dont have to change the back springs since i only DD not track.

Is all this accurate? I'm going to give Swift a call tomorrow, do you guys have any affordable recommendation of a good spring, i honestly trust this community's opinion, you guys know more about this than i do.


Side Note: heard a loud clunk today wen turning the wheel to one side. it was hard to turn.. The car was off but push start was in "on" position. should i be worried?

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Old 04-26-2018, 12:44 AM   #4 (permalink)
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Bump, I really need help here, im doing hours n hours of research and i can't seem to really find any solid answers
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Old 04-26-2018, 08:31 AM   #5 (permalink)
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Originally Posted by Asus_ View Post
Bump, I really need help here, im doing hours n hours of research and i can't seem to really find any solid answers
Have you tried to search in any “stance” or suspension based forums? They may have more accurate answers for you, if those forums exist.
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Old 04-27-2018, 02:34 AM   #6 (permalink)
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Originally Posted by ZontheRocks View Post
Have you tried to search in any “stance” or suspension based forums? They may have more accurate answers for you, if those forums exist.
I have lol probably spent roughly 8+ hours reading up as much as i could but only small bits here n there were usefull while most of it was useless as it was for different coils and much different application than what i needed.

So after talking with Swift, here is the info.

KW V3 Spring 9.3" 237mm (Height)
Progressive Spring
Spring Rate - 88 N/mm

Replaced with

Swift Metric Spring 7" 178mm (Height)
Linear Spring
88.24 N/mm = 504 Pounds per inch
Outer Diameter - 89mm

I don't remember why exactly we chose 7" but i think he had a reason for it, possibly something to do with how the stock v3's progressive spings work, i dont remember tbh...I'm just tad worried cause he said something about play in the spring since it'll be shorter but also said its not an issue.

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Old 08-09-2018, 01:51 PM   #7 (permalink)
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Did you ever move forward with this?

We've done numerous of umbrella kits, adding a cup kit to the KW setup, adding a swift spring, no issues
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Old 08-10-2018, 05:08 PM   #8 (permalink)
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Did you ever move forward with this?

We've done numerous of umbrella kits, adding a cup kit to the KW setup, adding a swift spring, no issues
I had everything ready to be installed to be honest but decided against it last minute because no one could tell me how exactly the car would ride on the swift springs and i would no longer be able to return it once mounted so i didn't want a rougher ride since i daily it!

Plus changing the springs when they are meant to be progressive just changes the dynamic a bit on these great coilovers so at that point do i really have v3 performing at their best with different springs, so if i ever change coilovers, i'll definitely attempt it again but i dont see a need to change coilovers for now. I keep contemplating the idea of going bags who knows!
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