Lots of talk about coilovers/lowering springs and all the posts normally come down to personal preference. So I thought it would be a good idea to collect some info for those looking to buy a set of coilovers or lowering springs.

I can update this first post when you post info on this thread. Spring rate is not always straight forward, if it's progressive I think we can collect the final rates before the spring closes. Helper springs are normally fully compressed so I think it is useless to collect that data.

SI-units are the easiest so we will use those. I can convert if you have lbs/in or some other values. Kg/cm (N/mm also) seems to be the most common so will use that. Newtons (N) are also used here approximation 10N ~ 1kg is close enough.

Damping is another thing that effects a lot, but I think it is enough just to collect if there are adjustable dampers or not. Damping explains why some coilovers can feel harder even they have softer spring rate, but spring rate is a good starting point in decision making.

If someone has a bench to measure stock springs that would be great too.

Here we go, in alphabetical order for Mk1 TT Quattro:

Make:AP
Model:
Product number: GF10-041
Front spring rate: 70 kg/cm
Rear spring rate: 60 kg/cm
Adjustment: height (F/R)

Make: AST
Model: 4100
Product number: 4622S-0014-M1
Front spring rate: 70 kg/cm
Rear spring rate: 80 kg/cm
Adjustment: height (F/R), Rebound (F/R)

Make: Bilstein
Model: PSS9
Product number: 48-080422 / F4-GM5-8042-H6
Front spring rate: 65 kg/cm
Rear spring rate: 117.5 kg/cm
Adjustment: height (F/R), Rebound (F/R)

Make: GAZ
Model: GHA/GGA
Product number: GHA336/GGA436
Front spring rate: 58 kg/cm
Rear spring rate: 80.4 kg/cm
Adjustment: height (F/R), GGA rebound also (F/R)

Make: H&R
Model: Street
Product number: 29431-1
Front spring rate: 65 kg/cm
Rear spring rate: 108 kg/cm
Adjustment: height (F/R)

Make: H&R
Model: Comfort
Product number: 29431-2
Front spring rate: 65 kg/cm
Rear spring rate: 90 kg/cm
Adjustment: height (F/R)

Make: H&R
Model: Twin-tube
Product number: 35431-1
Front spring rate: 60 kg/cm
Rear spring rate: 114 kg/cm
Adjustment: height (F/R), rebound (F/R)

Make: KW
Model: Variant 3
Product number:
Front spring rate: 81.3 kg/cm
Rear spring rate: progressive, rate unknown
Adjustment: height (F/R), rebound (F/R), compression (F/R)

Make: KW
Model: Clubsport
Product number:
Front spring rate: 101.9 kg/cm
Rear spring rate: progressive, rate unknown
Adjustment: height (F/R), rebound (F/R), compression (F/R)

Make: ST Suspension (KW sub brand)
Model: Coilover kit
Product number: 90830
Front spring rate: 70 kg/cm
Rear spring rate: unknown (marked: 8012 14E11)
Adjustment: height (F/R)

Make: Weitec (KW sub brand)
Model: Hicon GT
Product number: 13210041
Front spring rate: 70 kg/cm
Rear spring rate: progressive spring approx. 110 kg/cm
Adjustment: height (F/R)

KW's have so far the hardest springs that probably was not a suprise to anyone who has driven a car with KW coilovers

Here is spring rate explained

Nate i tip my hat to you sir .... exellent idea this thread. Would be fantastic to have information one page for reference and comparison!

Damien.

Sent a PM to AwesomeJohn as he is selling quite many brands of springs and coilovers, I hope he can fill in the data for Weitec, AP, FK.

I'm sure he will help but he is off for a week so don't expect a quick reply

I take my time but i get there in the end!

Make: AP
Model:
Product number: GF10-041
Front spring rate: 70/170 N/mm
Rear spring rate: 60/130 N/mm
Adjustment: height (F/R)



Make: Weitec
Model: Hicon GT
Product number: 13210041
Front spring rate: 70 N/mm
Rear spring rate: progressive spring approx. 110 N/mm
Adjustment: height (F/R)

Still working on FK but i'll get to the bottom of it as quick as i can.

Excelent, thanks John!

Those AP's have progressive springs also? I'm quessing that first number is the starting rate and the last one just before the spring closes.

That's what i thought but the second number is actually the length of the spring off the vehicle!

nate42 wrote:
Make: KW
Model: Clubsport
Product number:
Front spring rate: 101.9 kg/cm
Rear spring rate: progressive, rate unknown
Adjustment: height (F/R), rebound (F/R), compression (F/R)

My ride

nate42 wrote:KW's have so far the hardest springs that probably was not a suprise to anyone who has driven a car with KW coilovers

I find them quite comfy

Matt B wrote:

nate42 wrote:
Make: KW
Model: Clubsport
Product number:
Front spring rate: 101.9 kg/cm
Rear spring rate: progressive, rate unknown
Adjustment: height (F/R), rebound (F/R), compression (F/R)

My ride

I bet that is one nice coilover setup for serious driving Do you have any pics of your coilovers? I think would be great addition to this thread.

glslang wrote:

nate42 wrote:KW's have so far the hardest springs that probably was not a suprise to anyone who has driven a car with KW coilovers

I find them quite comfy

What version you have V1/V2/V3? They might come with different springs. Car weight, ARB's and damper settings also effect alot, good you like them

Old and bad quality pics of AST 4100

Matt B wrote:

nate42 wrote:
Make: KW
Model: Clubsport
Product number:
Front spring rate: 101.9 kg/cm
Rear spring rate: progressive, rate unknown
Adjustment: height (F/R), rebound (F/R), compression (F/R)

My ride

Propper job, seriously expensive but just about as good as you can get!

Added Bilstein PSS9