Honda Spring Rates for Stock and Aftermarket Springs

[kommon_sense]

Thought that I would share this. I found this info on club si. It was posted by Hondaman.

Would probably be nice if this were made into a sticky.

A special thanks to MikeK for keeping these that I posted a long time ago.

For 96-00 Civics (EJ6-8 and EM1 chassis codes)
96-00 EX - 165F/80R (P/P)
99-00 Si (EM1) - 201F/99.8R (P/P)
97, 00-01 ITR - 250F/250R (L/P)
GS-R - 200F/95R (P/P)

H&R OE - 280F/190R (P/P)
Eibach ProKit - 290F/190R (P/P
H&R Sport - 330F/280R (P/P)
Eibach Sportline - 310F/275R (P/P)
Neuspeed SofSports - 260F/150R (P/P)
Neuspeed Sport - 280F/180R (P/P)
Neuspeed Race - 485F/395R
Skunk Coilovers -old - 400F/300R (L/L), 500F/400R for integra
Skunk2 Coilovers - new - 500F/400r (L/L)
Progress Coilovers - 350F/250R (L/L)
Progress Lowering Springs - 320F/200R (L/L)
Ground Control Coilover - 380F/280R (P/P) (this is the standard kit and the springs are mildly progressive).
Tein RA/RE/RS - 783F/559R (L/L)
Tein HT - 1119F/448R (L/L)
Tein HG - 365F/129-196R (L/P)
Tein SS - 448F/224R
Tein Flex - 504F/280R
Tein S. Tech - 235F/140R
APEX'i WS - 447f/178r
Suspension Techniques - needed
JIC FLT-A2s - USDM - 504F/336R (L/L)
Sparco - needed

For 02+ Civic Si (EP3): ~ Very special thanks to Mike (EXavier) for these!!!
Progress - 280F/500R
Eibach Pro-Kit- 15-20% stiffer then stock
Eibach Sportlines - 20-25% stiffer then stock
Sprint - 20-25% more then stock
H&R Sport - 25-30% more then stock
Tein SS - 336F/448R
Tein Flex - 448F/559R
Tein S. Tech - 157F/291R
We are really in need of finding out what stock rates are for an EP Hatch!!!

If you've got any to add or have springs for me to test let me know and I'll put them on the compression tested and do a full plot of the springs. I'll need one front and one rear spring to test them.

P = Progressive
L = Linear

[tdoto_]

nice find man................do you think there is a big difference from the 95 t0 the 96 ex's

[kommon_sense]

I don't have any hard facts. However my girl's 95ex does feel a bit stiffer than my 98ex did when it was stock.

[hcvcx]

are the neuspeed race springs for 96-00 civics progressive? or linear?

[kommon_sense]

Don't know for sure, however i would assume that they are progressive since the other neuspeed springs are progressive.

[91Teg/99EX]

I can get a good deal for my friend's used tokiko illumina / ground control setup. The problem is that his car is a 1999 Civic SI and mines is a 1999 Civic EX. I know the shocks/coilovers will fit my car, but will it ride like crap since the spring rates are different and meant for a b16 motor?

[kommon_sense]

I doubt it. Most companies make the same spring for all 96-00 civs. Also, there shouldn't be a significant weight difference between your 99ex and a 99-00si.

[phuckinilltegie]

who has had both ground control and skunk 2 on the same car? how much bumpier were the skunk 2's? i had the old skunks and ground controls and i didn't notice much difference between them.

also what shocks did you have them paired with? i know this had been asked so many times

[stackz]

ok, sorry to bring this from the dead but from what I can tell it seems like in order of most comfy ride quality compared to stock these would be my best choices:

stock:
96-00 EX - 165F/80R (P/P)

choices:
Neuspeed SofSports - 260F/150R (P/P)
Neuspeed Sport - 280F/180R (P/P)
Eibach ProKit - 290F/190R (P/P)

uber stiff macho ass rattler:
Tein HT - 1119F/448R (L/L)

am I correct in this assumption? how the hell can stock rear springs be 80 and aftermarket ones start at 150?

[kommon_sense]

Well, if you go solely based on spring rates, then you are correct. However the quality of the spring and design play a part as well. My car rides smoother with h&r sports than it did with eibach pro-kits.

Comparison H&R Sports vs. Eibach Pro-Kits vs. Stock (56k no-no...)

[stackz]

Originally Posted by kommon_sense

Well, if you go solely based on spring rates, then you are correct. However the quality of the spring and design play a part as well. My car rides smoother with h&r sports than it did with eibach pro-kits.

Comparison H&R Sports vs. Eibach Pro-Kits vs. Stock (56k no-no...)

that article was exactly what I was looking for. first time anyone has compared stock springs in pictures against other company springs. so the h&r sports drop it lower than the eibachs?? how much? what is your overall drop?

as long as I can go up SOME over my 2"-2.25" drop that I have right now I'll be happy. Also, couldn't you compensate by getting a thicker spring pad? or taking it out all together? can't remember which would compress the spring or not.

I didn't know koni yellows were height adjustable? time to look into that I guess.

just how bumpy is the ride on those springs? right now I go 15 mph downtown atlanta on the old shitty streets by the park and it's like I'm in a mine cart...

[kommon_sense]

The konis have several rings and a clip. You put the clip in one of the rings and the spring perch rests on the clip, so you can adjust the height up or down about an inch total (5 spring positions). So i raised the front up one setting. I'm probably 1.75-2" lower in the front. I don't have any daily driving clearance issues.

The ride is very smooth on decent roads, but if you hit a harsh bump, you know it It is fine for daily driving. My woman doesn't complain. On decent roads it was on par with her stock 95ex. However the difference becomes noticeable on rough roads. I probably wouldn't want to go much stiffer on a daily driver.

[stackz]

Originally Posted by kommon_sense

My woman doesn't complain.

sounds good to me. I actually bought a set of the H&R sports earlier today and they're in transit as I write this...bought time I did something. I just hope these will help out. If not then I'm going to get the OE sports...

now I need to figure out what shocks I want, probably end up getting agx's

[Midd1e Finger U]

I'm throwing some Susp. Techniques on my car today. How do you find out the spring rate?

[kommon_sense]

You are going to have to call and ask. THe manufacturer *may* or may not tell you the rates. Some just won't give that info out. Only way to truly find out is with a spring dyno.