Spring rates civic /integra

[hondaNickx]

Copy/paste From Civicclub.com ... Everything is given in lbs/ins to convert to kg/mm divide by 56.
Example = 240kg/ins divide by 56 = 4.28kg/mm = 4.2K

P = Progressive
L = Linear


For 92-95 Civic (EJ ,EG)
K-Sports medium (Ej1) 672F/336R



For 96-00 Civics (EJ, EK and EM1 chassis codes)

Code:
96-00 EX factory 165F/80R (P/P)
99-00 Si (EM1) factory 201F/99.8R (P/P)
CTR factory EK9 240/240 (L/P)
APEX'i WS 447F/178R
D2 (ej9) 616F/392R
Eibach ProKit 290F/190R (P/P)
Eibach Sportline 310F/275R (P/P)
Gold-line GL 2.5" drop 320/190 (P/P)
Gold-line GPS 1.25" drop 275/160 (P/P)
Ground Control Coilover 380F/280R (P/P)*
H&R OE 280F/190R (P/P)
H&R Sport 330F/280R (P/P)
JIC FLT-A2s (USDM) 504F/336R (L/L)
Koni RSK Suspension kit 154-205/270 (P/L)
Neuspeed SofSports 260F/150R (P/P)
Neuspeed Sport 280F/180R (P/P)
Neuspeed Race 485F/395R
Omni-Power Adjustable Sleeve Coilover 448F/336R (L/L)*
Omni-Power Street Coilovers 448F/336R (L/L)*
Omni-Power Sport Coilovers 539F/448R (L/L)*
Omni-Power Drag Coilover 810F/810R (L/L)*
Omni-Power 6-Way Damping Coilovers 539/448/336 (L)*
Progress Coilovers 350F/250R (P/P)
Progress Lowering Springs 320F/200R (P/P)
SkunkWerks Coilovers (old) 400F/300R (L/L)
Skunk2 Coilovers (new) 500F/400r (L/L)
Sparco needed
Spoon Full Coilovers 300/240
SSR Cup 392/280
SSR S1 448/448
Suspension Techniques 10-15% more then stock (P/P)
Tanabe DF-210 10-15% more then stock
Tanabe NF-210 5-10% more then stock
Tein HT 1119F/448R (L/L)
Tein HG 365F/129-196R (L/P)
Tein SS 448F/224R
Tein Flex 504F/280R
Tein RA/RE/RS 783F/559R (L/L)
Tein S. Tech 235F/140R
Tokico Illumina Kit 250/123 (P/P)

For 02-05 Civic Si (EP3)

Code:
Eibach Pro-Kit 15-20% stiffer then stock
Eibach Sportlines 20-25% stiffer then stock
H&R Sport 25-30% more then stock
Omni-Power Street Coilovers 448F/336R (L/L)*
Omni-Power Sport Coilovers 539F/448R (L/L)*
Omni-Power 6-Way Damping Coilovers 539/448/336 (L)*
Progress 280F/500R
Sprint 20-25% more then stock
Tein Flex 448F/559R
Tein SS 336F/448R
Tein S. Tech 157F/291R

For 94-01 DC Integra

Code:
97, 00-01 ITR factory 250F/250R (L/P)
GS-R factory 200F/95R (P/P)
OEM 60x343mm 252F/140R (L/P)
Comptech Sport 335F/210R (L/P)
Eibach Pro Kit 288F/213R (P/P)
Eibach Sport Line 325F/241R (P/P)
Endless Zeal Function B6 Hard 672F/448R (L/L)
Endless Zeal Function B6 Street 560F/336R (L/L)
Ground Control Coilovers 380F/250R (L/L)*
H&R OE Sport 302F/168R
H&R Race 460F/350R (L/L)
H&R Sport 276F/276R (L/P)
HKS SF5 398F/291R (L/L)
KW variant 1 needed (L/L)
KW variant 2 needed (L/L)
KW variant 3 needed (L/L)
Mugen 5 Adjustment Kit 381F/252R (L/L)
Neuspeed Race 455F/360R (L/L)
Neuspeed Soft Sport 250F/185R (P/P)
Neuspeed Sport 250F/185R (P/P)
Omni-Power Adjustable Sleeve Coilover 448F/336R (L/L)*
Omni-Power Sport Coilovers 539F/448R (L/L)*
Omni-Power Street Coilovers 448F/336R (L/L)*
Omni-Power Drag Coilover 810F/810R (L/L)*
Omni-Power 6-Way Damping Coilovers 539/448/336 (L)*
RS*R Race 279F/268R (L/L)
RS*R SUS 242F/173R (P/P)
SkunkWerks Coilovers (old) 500F/400R
Skunk2 Coilovers (new) 500F/400R (L/L)
Spoon Progressive 358F/303R (P/P)
Spoon Stright Spring 60x200mm 448F/448R (L/L)
Swift Sport Mach Luxury 336F/196R (L/L)
Tanabe DF210 241F/201R
Tanabe GF210 302F/235R
Tanabe NF210 274F/201R
Tein High Tech 296F/257R (P/P)
Tein S-Tech 335F/274R (P/P)
* = Can custom make coil-overs with superior spring rates (0.25lb/ft increases)

[hondaNickx]

Interesting to see is the EK9 spring rate is allready 4.2K .That's a really good upgrade compared to the stock civic ex (coupe) and still have a stock suspension.

[saxophonias]

a friend of mine has placed the dc2 spings with koni shocks to his ee9. Good improvement but not something extremely special to suggest. Antiroll bars are the key i think.
Thanks for the list.
Furthermore, calculating the harshness to progressive springs in comparison to linear ones is very difficult.

[Dodo Bizar]

What suprises me is the bias of some kits, I see kits with front 2 to 3 times stiffer as rear, and some of the sport/race kits have this ratio 1.

In my case I can add for Civic chassis 92-99:

D2 616F/392R (need confirmation of the rear)
K-Sports medium: 672F/336R (also rear needs confirmation)

You see the K-Sports has a bias of 2:1 and it feels a lot softer as the D2... though chassis (EJ9 on D2 vs EJ1 on KS) also can make a diff. I'd rather have a setup closer to 1... or actually I'd like the ratio to be the same as the weight bias of the car, so when sudden steering the car does not twist since the roll angle balance front and rear are the same...

[BETEK]

Civic EJ9 1400cc 1996-2000 spring rates

Front: 152
Rear: 82.1


(Web site that calculates spring rates http://www.pontiacracing.net/js_coil_spring_rate.htm )

[saxophonias]

wow. So soft..

[Dodo Bizar]

My K-Sports under the EJ1 brake down in the meantime (2 dampers started leaking after 4 years, I consider myself lucky since other people had it as soon as 2 months). The D2 under the EJ9 are now donated to the EJ1... and surprise surprise I always found the EJ9 stiffer, but now the D2's are under the EJ1 and the car is actually much stiffer. Conclusion, factory specs are very inaccurate sometimes. There might be a bias in my story due to damping difference... but my gut feeling tells it is in the springrate itself since roll in corners has changed as well.

[Firebass]

i got dc2 springs with kayaba AGX they are very good so far for some improvement and can handle my B engine so not the tires fall too much and touch the fenderes , very good for drag also ^_^

[saxophonias]

For some weeks now I have installed some ITR DC2 springs with my bilstein shocks.
They are identical in height with my previous HhR springs. I couldn't believe my eyes.
https://www.dropbox.com/s/zd2lvofegg2ak ... 7.jpg?dl=0
https://www.dropbox.com/s/f9ji6cfblvgmo ... 9.jpg?dl=0

The ride height is identical to HnR, so almost 3.5cm
The car handles very nice and it is very comfy, and bounces significantly less. I will post a good photo to see how it sits.

[hondaNickx]

For some weeks now I have installed some ITR DC2 springs with my bilstein shocks.
They are identical in height with my previous HhR springs. I couldn't believe my eyes.
https://www.dropbox.com/s/zd2lvofegg2ak ... 7.jpg?dl=0
https://www.dropbox.com/s/f9ji6cfblvgmo ... 9.jpg?dl=0

The ride height is identical to HnR, so almost 3.5cm
The car handles very nice and it is very comfy, and bounces significantly less. I will post a good photo to see how it sits.

That could makes sence since a Type-r sits 1.5-2cm lower then a regular civic .And there might be some difference in spring height between the civic and integra springs.
Good to know integra springs lower about 3.5cm on a civic.