Spring Rates/Drop rate

[mhx]

[Springs]
Stock EP3: Spring Rate: (248 Front/440 Rear)
Stock RSX: Spring Rate: (279 Front/458 Rear)
-
Dropzone: Spring Rate: (? Front/? Rear) - Drop: (2in all around)
Eibach Pro-kit: Spring Rate: (15-20% more than stock) - Drop: (1in Front/1.1in rear)
Eibach Sportline: Spring Rate: (20-25% more than stock) - Drop: (1.4in Front/1.5in Rear)
H&R Sport: Spring Rate: (25-30% more than stock) - Drop: (2in all around)
Neupseed Race: Spring Rate: (200 Front/280 Rear) - Drop: (2in all around)
Neupseed Sport: Spring Rate: (200 Front/280 Rear) - Drop: (1.5in Front/1.5in Rear)
Progress: Spring Rate: (280 Front/500 Rear) - Drop: (1.8in Front/1.5in Rear)
Sprint: Spring Rate: (20-25% more than stock) - Drop: (2in all around)
Spoon Progressive: Spring Rate: (413 Front / 458 Rear) - Drop: (1.5-1.7in all around)
Tanabe df210: Spring Rate: (10-15% more than stock) Drop: (2in Front/2.3in Rear)
Tanabe nf210: Spring Rate: (10-15% more than stock) Drop: (1.5in all around)
Tanabe gf210: Spring Rate: (20-30% more than stock) Drop: (1.3in Front/1.5in Rear)
Tein H Tech: Spring Rate: (257 Front/476 Rear) Drop: (.8in Front/.7in Rear)
Tein S Tech: Spring Rate: (280 Front/515 Rear) Drop: (1.4in Front/1.3in Rear)

[Ground Controls]
Dropzone: Spring Rate: (? Front/? Rear)
Ground Control EP3 kit: Spring Rate: (375 Front/450 Rear)
Skunk2 Coilovers: Spring Rate: (440 Front/330 Rear)

[Full Coil-overs] Spring & Shock (fixed height)
Mugen: Spring Rate: (283 Front/439 Rear) Drop: (1.4in all around)
Honda Factory Performance: Spring Rate: (? Front/? Rear) Drop: (?in all around) - very similar to the mugen kit, awaiting specs

[Full Coil-overs] Spring & Shock (adj height)
Buddy Club Racing Spec: Spring Rate (559 Front/894 Rear) (Adj ?? min - ?? max)
JIC FLT-A2: Spring Rate: (504 Front/560 Rear) Drop: (Adj stock - 3.5in max)
KW V2: Spring Rate: (340 Front/515 Rear) Drop: (Adj 1.4in min - 2.6in max)
Progress C1: Spring Rate: (350 Front/640 Rear) Drop: (Adj 1in min - 4in max)
Tein Basic: Spring Rate: (336 Front/448 Rear) Drop: (Adj ?? min - ?? max
Tein Type Flex: Spring Rate: (448 Front/559 Rear) Drop: (Adj ?? min - ?? max)
V2 Coilover kit from KW: Spring Rate: (340 Front/500 Rear) Drop: (Adj 1.4 min - 2.6 max)

[conversion rates]
1 kg/mm = 55.88 lb/in
1 N/mm = 5.588 lb/in

[What is Progressive Spring Rate?]
Progressive rate springs are likely

[Btrthnezr3]

Great info...Sticky.

[02SilverSiHB]

*Stock: 248 front 440 rear *

Eibach pro kit: 15-20% more than stock Drop: 1" front and 1.1" rear
Eibach sport line: 20-25% more than stock Drop: 1.4 Front 1.5 Rear
GroundControl EP3 kit: 375ft/450rear
H&R Sport: 25-30% more than stock Drop: 2" Front and Rear
JIC FLT-A2 coil overs: 392 front and 448 rear
Mugen Spring Rate: EP3 49.6/77.1 N/mm F/R (=283/439 lb/in F/R)
Neupseed Race: 200 front 280 rear Drop: 2" front and rear
Neupseed Sport: 200 front 280 rear Drop: 1.5" front and rear
Older set is 440 front and rear
Progress: 280 front and 500 rear Drop: 1.8" front and 1.5" rear
RXS 49.0/80.4 N/mm F/R (=279/458 lb/in F/R)
Skunk2 Coilovers: Newer set is 440 front and 330 rear
Spoon Progressive F/R (kg/mm) 7.4 / 8.2 (1.5-1.7in drop)
Sprint: 20-25% more than stock Drop: 2" front and rear
Tein Flex: 448 front and 559 rear
Tein S Tec: ???? Drop 1.5" front 1.4" rear
Tein Type Flex: 8ft/10rear (448/560)
V2 Coilover kit from KW: 340 front 500 back drops from 1.4" - 2.6"

reply with any corrections/updates.. Thanks 02silver found your old post on k-series.. Please sticky this.
cool, where did you find it on k-series? I couldn't find it, everythings been switched around over there.

Oh, I'm not a mod, so I can't sticky it

[Gold_EP3]

i know its a dumb question but, the higher the spring rate the softer? or is it the higher the spring rate the stiffer? thanks guys

[mhx]

i know its a dumb question but, the higher the spring rate the softer? or is it the higher the spring rate the stiffer? thanks guys

higher the spring rate the stiffer the ride.

[djsolution]

mhx, are you sure about the tein s-tech spring rates? I was under the impression that they had lower rates than stock.

[djsolution]

Never mind, I just checked the TEIN website and saw that they're developing an EP3-specific application with the 280/515 rates. Unfortunately, those of us with the 01+ civic s-tech springs have the soft-as-buttah 157/291 rates. :(

[mhx]

mhx, are you sure about the tein s-tech spring rates? I was under the impression that they had lower rates than stock.

its on the website

[02SilverSiHB]

Never mind, I just checked the TEIN website and saw that they're developing an EP3-specific application with the 280/515 rates. Unfortunately, those of us with the 01+ civic s-tech springs have the soft-as-buttah 157/291 rates. :(
yeap...time to trade up for the real ones :D

[02SilverSiHB]

its on the website
I'd annote that some people have the lower spring rate, because tein just came out with specific ones for the ep3

[John02Si]

correct me if i'm wrong but the :

Neupseed Sport: Spring Rate: (200 Front/280 Rear) - Drop: (1.5in Front/1.5in Rear)

Will actually be a softer ride than stock???

[mhx]

correct me if i'm wrong but the :
Neupseed Sport: Spring Rate: (200 Front/280 Rear) - Drop: (1.5in Front/1.5in Rear) Will actually be a softer ride than stock???

Consider you have 2 springs having different spring rates: One with 345 and the other with 480. So what does it mean?

It means the 1st spring will compress 1mm if you put a load of 345 grams, while the 2nd one will not. The 2nd one will need a 480 g. load to compress 1mm. According to this, we can say that the 2nd spring is harder than the 1st one, or we can state that:

Springs that have a low Spring Rate are soft, while springs that have a high Spring Rate are stiffer.

[John02Si]

that being said above, am i going to be bouncing all over the place? i know ive already asked a few of you this question, but i'm really looking for the closest feel to stock as possible.

[FattyMcJ]

Anyone have any info on the D2 coilovers? Are these good for AutoXing?

[mhx]

that being said above, am i going to be bouncing all over the place? i know ive already asked a few of you this question, but i'm really looking for the closest feel to stock as possible.

I suggest getting:
Mugen: Spring Rate: (283 Front/439 Rear) Drop: (1.4in all around)
or
get an pro-kit

[mhx]

Anyone have any info on the D2 coilovers? Are these good for AutoXing?


i will get some, i was having a hard time searching for d2 because its too short. check back to the post and ill get it up sometime this week.

[LiLxKeNnY]

this is gonna be really useful!!!

[mhx]

this is gonna be really useful!!!
Yup, and i will update it when i find more springs/coilovers etc..

[Tenacious G]

it should be noted that the Tein springs for the EP are not out yet, according to Tein's Web site.

it's nice they finally came out with EP-specific springs.

[seandwd]

This is a great post. I will definately use this chart to aid me in the decision of what spring to buy. I'm leaning towards the Eibach Sportline. Thanks for the awesome info!!!

[mhx]

This is a great post. I will definately use this chart to aid me in the decision of what spring to buy. I'm leaning towards the Eibach Sportline. Thanks for the awesome info!!!

Yup, thats why i put it together..I didnt know what to buy myself... I do now.. I want the progress c1 kit..

[trickkykidd.02]

anybody know the HFP and UK/JDM spring rates ??

pls add to sticky list..

thnx

[SI DRAFTER]

Does Anyone Have Any Info On The Koni Springs That Come In The Sport Kit? Their Website Said 35 - 45mm Drop, Which Is +/- 1.5". But Whats The Spring Rate? Anyone Have This Kit?

[Zzyzx]

that being said above, am i going to be bouncing all over the place? i know ive already asked a few of you this question, but i'm really looking for the closest feel to stock as possible.

"Bounce" is more a question of damper then spring, given the fact that all springs want to bounce. And its the job of your dampers to prevent them from doing so.

Of course I've seen people confuse Bouncy rides with rough/stiff rides.

[nolij869]

so if its the job of the shock/strut to limit the bounce of the spring is it possible to still get a stiffer ride if u have aggresive(over stock) dampners and softer(less than stock) spring rates? or will you still have a softer ride because of the lower spring rates?

[thechromecoyote]

UKDM/ JDM Stock EP3 Type R
(257 / 419.10) Progressive

[Zzyzx]

so if its the job of the shock/strut to limit the bounce of the spring is it possible to still get a stiffer ride if u have aggresive(over stock) dampners and softer(less than stock) spring rates? or will you still have a softer ride because of the lower spring rates?

Depends on the damper. Dampers have two directions that they work in, Bump (Compression) and Rebound (extension) and Damper mfg's adjust the valving differently for each.

Of the two, Bump influences ride quality much more them rebound. Simply because the compression of the suspension is more jarring then the extension of the suspension. For example you hitting a pot hole. You don't feel that initial drop off (Rebound) but rather you fee the hit of the suspension and consequent compression of the suspension when it hits the other side of that pot hole.

You could say that overly stiff bump valving has the side effect of Faking a stiff spring rate.


As far as handling is concerned, Stiff bump valving has some drawbacks. As noted above you end up faking a stiffer spring rate.. which also means you are faking a stiffer Suspension frequency. which means less potential grip over less then perfectly smooth asphalt. Remember, stiffer springs = less mechanical grip. With that said, Optimum bump valving should be stiff enough to improve chassis responsiveness, but not so stiff as to cause the car to skip over bumps and ruts. A tire in the air can make no traction!!

[nolij869]

i see thnks for the info zzyzx just got curious after reading into the thread... ohh and the spring rates for the tokico advanced handling suspension kit are 240/300

[kwiksi]

Wow. I'm shocked at how much more heavier the Progress springs are in the rear than the front. Car handles great though.:mbiggrin:

[Zzyzx]

Wow. I'm shocked at how much more heavier the Progress springs are in the rear than the front. Car handles great though.:mbiggrin:

It just means Progress did their homework on the car.

The motion ratio of the rear suspension is nearly half of the front... Meaning only about half of the spring rate is actually getting to the tires contact patch.

[bigo711]

i think we need a update.
the info on tein coilovers are incorrect.

TEIN FLEX is 678 780
TEIN SS is 340 450

all tein info can be found on http://www.tein.com/tech_info/a12.html

[SHHEP3@UB]

Does Anyone Have Any Info On The Koni Springs That Come In The Sport Kit? Their Website Said 35 - 45mm Drop, Which Is +/- 1.5". But Whats The Spring Rate? Anyone Have This Kit?

i am also looking into the Koni Sport Suspension Kit, and would like to know if anyone has used it/ know someone who has used it. the stock struts are beginning to leak in the front so i want to to replace the whole setup, and the Koni kit looks the best especially since each damper is externally adjustable.

if anyone else has any other ideas, open to suggestions. i want a sporty ride for auto crosses, but nothing too harsh for commutes to work and school. i need to keep things on a budget, and about $750 for the koni kit is right in my price range.

[mustclime]

true choice told me the koni springs are about 20% stiffer than stock.....thats abour 300lb ft and 490 lb rear :mwink:

[frm_808]

[Full Coil-overs] Spring & Shock (adj height)
Buddy Club Racing Spec: Spring Rate (559 Front/894 Rear) (Adj ?? min - ?? max)
JIC FLT-A2: Spring Rate: (504 Front/560 Rear) Drop: (Adj stock - 3.5in max)
KW V2: Spring Rate: (340 Front/515 Rear) Drop: (Adj 1.4in min - 2.6in max)
Progress C1: Spring Rate: (350 Front/640 Rear) Drop: (Adj 1in min - 4in max)
Tein Basic: Spring Rate: (336 Front/448 Rear) Drop: (Adj ?? min - ?? max
Tein Type Flex: Spring Rate: (448 Front/559 Rear) Drop: (Adj ?? min - ?? max)
V2 Coilover kit from KW: Spring Rate: (340 Front/500 Rear) Drop: (Adj 1.4 min - 2.6 max)



what would you guys choose of these for autoX and y

[oldskoofame]

i posted this stuff early last year along with sway bar infos.

[oldskoofame]

what would you guys choose of these for autoX and y

depends what tires you are running along with camber that you desire. also not to forget the sway bar and the balance of the chassis.

[frm_808]

depends what tires you are running along with camber that you desire. also not to forget the sway bar and the balance of the chassis.

i posted this stuff early last year along with sway bar infos.


got a link then

[oldskoofame]

got a link then

is that a question or a command?
as you can see, ephatch was rebooted and i believe only recent threads have been kept.

[frm_808]

is that a question or a command?
as you can see, ephatch was rebooted and i believe only recent threads have been kept.

that sux

[Zzyzx]

for prebuilt setups for compitition....

Buddy Club Racing Spec:Yes, Good dampers
JIC FLT-A2: Spring Rate: No, Bad dampers
KW V2: Spring Rate: Yes, good dampers
Progress C1: Yes, good dampers
Tein Basic: no, Bad dampers
Tein Type Flex: no, bad dampers


Spring rates can be changed as nessisary for tuning... Dampers are much more problematic as you are stuck with the basic design from what ever mfg you buy from. even if they do allow for re-valving. I.e. Single adjustible dampers that adjust both bump and rebound Vs the better single adjustible dampers that only adjust rebound.

[frm_808]

for prebuilt setups for compitition....

Buddy Club Racing Spec:Yes, Good dampers
KW V2: Spring Rate: Yes, good dampers
Progress C1: Yes, good dampers


are these rebuildable?

[oldskoofame]

that sux

it's all good.
members still won't understand how to shop around looking at those numbers.

[oldskoofame]

are these rebuildable?

revalving you mean..

if u can revalve it, you can rebuild it, as long as you have contact with the company.

if you can rebuild it, it doesn't always mean you can revalve it.

[frm_808]

it's all good.
members still won't understand how to shop around looking at those numbers.
ya i know that spring rate needs to be higher in the rear

revalving you mean..

if u can revalve it, you can rebuild it, as long as you have contact with the company.

if you can rebuild it, it doesn't always mean you can revalve it.

ya thats true. i guess i gotta see wat company does this.
im not in a big hurry for coils. just doing my time of researching. thanks for the info bro

[clizoman]

add bc n+ 10 , 14

[EP3_U_SEE]

noob question.......

wouldn't it be better if you had skunk 2 coilover fronts and ground control rears...?

[metalviper]

for what is the setup for? the stiffer springs in the rear will help reduce understeer on a stock chassis suspension. the motion ratio of the ep3 requires stiffer rear springs than fronts, unlike other hondas. but getting custom spring rates from gc>skunk2+gc

[mustclime]

noob question.......

wouldn't it be better if you had skunk 2 coilover fronts and ground control rears...?

the groundcontrol adjustor collors are a better design any way.....

[chiwhitesi]

i want to bump this zombie thread

does anyone have the spring rates that come with the Koni Sport Springs?

[SHHEP3@UB]

i want to bump this zombie thread

does anyone have the spring rates that come with the Koni Sport Springs?

I have the koni sport springs, and all they tell you is that they are "progressive". I have looked them up online and even sent them an email and did not get an exact answer. i bought the whole koni sport kit with strut inserts, so the springs were matched to the struts. They do give a full 2" drop, if that helps.

[chiwhitesi]

I have the koni sport springs, and all they tell you is that they are "progressive". I have looked them up online and even sent them an email and did not get an exact answer. i bought the whole koni sport kit with strut inserts, so the springs were matched to the struts. They do give a full 2" drop, if that helps.

thats the kit was was hoping to get, the drop is advertised as 35mm i thought that was pretty good but u said 2in??? hmmm

how is the ride?
ever auto x?

[SHHEP3@UB]

thats the kit was was hoping to get, the drop is advertised as 35mm i thought that was pretty good but u said 2in??? hmmm

how is the ride?
ever auto x?

I did have a review of the kit after I installed them, but it was deleted.

Yeah, I was very surprised when the car come off the lift and seeing how low it was. 35mm is just an estimate from koni. I bought the sport kit because the stock struts had blown after 130k miles, and I wanted something specifically for autocross. It cost me $700 for the whole kit plus $300 for installation, which was another reason why I bought it. The set up is very stiff, it's livable, but still a nasty impact when you hit a pothole. I have taken the car to an autocross with the new setup, but haven't really had enough time to really play with the adjustable dampening to really find a good tune, so I just cranked all four corners down to the fastest dampening and it did make a huge difference. Much less body roll, much better weight transfer, and controlling the front tires with the throttle was much easier. I would recommend the kit, but if you want to be really competitive, mix and match the struts to springs that would give you a better ride height.

http://sphotos.ak.fbcdn.net/hphotos-ak-snc1/hs209.snc1/7630_161832037266_626397266_3341030_3911391_n.jpg
http://sphotos.ak.fbcdn.net/hphotos-ak-snc1/hs209.snc1/7630_161832052266_626397266_3341033_264185_n.jpg
http://sphotos.ak.fbcdn.net/hphotos-ak-snc1/hs229.snc1/7630_161832057266_626397266_3341034_1720969_n.jpg
http://sphotos.ak.fbcdn.net/hphotos-ak-snc1/hs209.snc1/7630_161852922266_626397266_3341439_669763_n.jpg

[chiwhitesi]

thanks alot man i appreciate your help, i think i will take the leap and pick up the kit. Why did it take $300 for the install? just curious

[SHHEP3@UB]

thanks alot man i appreciate your help, i think i will take the leap and pick up the kit. Why did it take $300 for the install? just curious

No problem! It took $300 for the install because they are strut inserts, not whole assemblies like the HFPs. The strut housing on the existing struts are cut apart and the koni inserts are put in place. It's not that hard to do yourself, there are actually a whole bunch of youtube videos with step by step instructions, but upstate New York winters caused every single nut and bolt to be corroded to the point that everything non-essential was torched and cut off. I do not have that kind of equipment, so I had a shop put them in. I was lucky too, the shop only charged me for their estimated cost because it took a lot longer than expected because of the corrosion. Gotta love salt.

[kai-wun]

Looking for a linear spring that's ~1" drop, with matched dampers. Aside from DC5 A-Spec suspension, any suggestions?

[lemonhead228]

i have a question about the tien s springs..

how would you kno if the springs are for a em2 or ep3?

i traded my stock springs for a set and now i have no idea!.

im dropped 1.5 in the rear and a lil lower in the front.

[EP3 Dream]

at what point is there a significant feel to a ride, softer or stiffer. in other words, if stock is 248/440, lets say i get a kit thats 220/400 (just random numbers) will i feel a difference? 240/430? im just trying to gauge how much stiffer/softer it would be comapring to stock. im looking for a slightly softer ride with about 1-1.5 drop. some of them have that drop but are stiffer (bleh), some have a little less drop but its softer, trying to figure out what to compensate for.

btw, theres signifcant up-bumps on my daily commute, and i drive very spirit-ly, and i use that term very loosely >.>

[HondaFreak]

WOW! Every single one of those I would consider soft. The race suspension I picked needs 700/1400 springs. Wow. And my car is only 2570 full. That's a very interesting set of info.

Christian

[EP3 Dream]

at what point is there a significant feel to a ride, softer or stiffer. in other words, if stock is 248/440, lets say i get a kit thats 220/400 (just random numbers) will i feel a difference? 240/430? im just trying to gauge how much stiffer/softer it would be comapring to stock. im looking for a slightly softer ride with about 1-1.5 drop. some of them have that drop but are stiffer (bleh), some have a little less drop but its softer, trying to figure out what to compensate for.

btw, theres signifcant up-bumps on my daily commute, and i drive very spirit-ly, and i use that term very loosely >.>

bump for help! :) (700/1400 is soft to u but not me xD)

[thakid]

Ok I been reading this stuff and I am so lost. I'm looking for coilovers that give me a drop of 2.5inch. And are great for daily driving. What do you guys recommend? Thanks.

[SamuraiSi]

anyone ever try the Megan Racing springs? i didn't see those on the list.

http://www.meganracing.com/product_detail.asp?prodid=467&catid=44

[i_love_my_ep3!]

someone please clear up this mess ive read this tread and got no where lol no offense.

[PatrickJamesYu]

this first page is pretty explanatory, no?

[makavelibranded]

someone please clear up this mess ive read this tread and got no where lol no offense.

everything you need is in the 1st post

[PatrickJamesYu]

Ok I been reading this stuff and I am so lost. I'm looking for coilovers that give me a drop of 2.5inch. And are great for daily driving. What do you guys recommend? Thanks.

All coilovers will allow this drop
with their adjustable height it's usually about 3 inches at most.
Some can dump it at like 4

[lemonhead228]

i bought a set of use mugen ss without springs. you guys think the tein s springs be a good replacement?

[Zzyzx]

Consider you have 2 springs having different spring rates: One with 345 and the other with 480. So what does it mean?

It means the 1st spring will compress 1mm if you put a load of 345 grams, while the 2nd one will not. The 2nd one will need a 480 g. load to compress 1mm. According to this, we can say that the 2nd spring is harder than the 1st one, or we can state that:

Springs that have a low Spring Rate are soft, while springs that have a high Spring Rate are stiffer.

Kind of... while the concept you posted applies to a springs in general, once they are attached to a car it really stops meaning anything useful. To get better data we have to take in to account both the motion ratio of the suspension that the spring is attached to as well as how much weight that suspension is holding. The 1st one gives you whats called "wheel rate" which is the effective spring rate acting at the contact patch of the tire. It will be, in nearly all cases, Less then the springs normal un mounted rate. the one time it can be greater is with cantilevered suspensions, such as those found on F1 cars. On this car the front motion ratio is ~.9 where as the rear motion ratio is ~.5... which means that only 90% of the front springs actual rate gets used; so if your front spring rate is 345 then your wheel rate is 345x.9= 310. Alternately on the rear where the motion ratio is .5 your 480 spring rate drops to a 240 wheel rate....
So while initially the front spring is "softer", when put on the car the front end actually ends up with the functional stiffer spring. And we haven't even taken weight supported in to account.

[DynamiteRoll]

Kind of... while the concept you posted applies to a springs in general, once they are attached to a car it really stops meaning anything useful. To get better data we have to take in to account both the motion ratio of the suspension that the spring is attached to as well as how much weight that suspension is holding. The 1st one gives you whats called "wheel rate" which is the effective spring rate acting at the contact patch of the tire. It will be, in nearly all cases, Less then the springs normal un mounted rate. the one time it can be greater is with cantilevered suspensions, such as those found on F1 cars. On this car the front motion ratio is ~.9 where as the rear motion ratio is ~.5... which means that only 90% of the front springs actual rate gets used; so if your front spring rate is 345 then your wheel rate is 345x.9= 310. Alternately on the rear where the motion ratio is .5 your 480 spring rate drops to a 240 wheel rate....
So while initially the front spring is "softer", when put on the car the front end actually ends up with the functional stiffer spring. And we haven't even taken weight supported in to account.

WOW I actually get that!

[Eddie Murphy]

What are the spring rates and drop rates on the RSX-S A-Spec Suspension Kit for 2002 - 2006?

[Hasbro]

What are the spring rates and drop rates on the RSX-S A-Spec Suspension Kit for 2002 - 2006?

3/4"

Rates are evasive. Somewhere in between the RSX and Mugen, I would say;

Stock EP3: Spring Rate: (248 Front/440 Rear)
Stock RSX: Spring Rate: (279 Front/458 Rear)
Mugen: Spring Rate: (283 Front/439 Rear) Drop: (1.4in all around)

[poeticfinesse21]

What are the spring rates and drop rates on the RSX-S A-Spec Suspension Kit for 2002 - 2006?

There's actually two different A-spec kits. One for the 02-04 RSX and one for the 05-06 RSX. The 05-06 kit has reversed springs in the front and is assumed to be slightly stiffer. Acura has never officially released the spring rates so no one know for sure. The only thing that is certain is that the springs are progressive meaning that they are somewhat soft under normal load and get progressively stiffer as they compress. I assume that the A-spec spring rates for the 02-04 kit are very similiar or maybe even identical to the 02-04 DC5 Type-R spring rates which are:

2.8 to 4.6kgf/mm front
3.0 to 8.0kgf/mm rear

I haven't been able to find the spring rates for the 05-06 DC5-R.
There's a lot of speculation that the A-spec kit is just rebadged Type-R suspension for the US market.

[Hasbro]

I would agree only from what I've read that they are the same. I happen to have early A-Spec springs and RSX dampers that I keep threatening to sell... very nice condition.

[Hasbro]

This is an old list. I've had it for 5 or 6 years and it was older than that. Don't know the original author's name. It has numbers I haven't seen anywhere else.



Spring Rates/Drop rate
[Springs]
Stock EP3: Spring Rate: (248 Front/440 Rear)
Stock RSX: Spring Rate: (279 Front/458 Rear)
UKDM/ JDM Stock EP3 Type R (257 / 419.10) Progressive
02-04 ITR DC5 3.7k front, 7.4k rear (207.19lbs/in front & 414.38lbs rear)
05-06 ITR DC5 4.6k front, 8.5k rear (257.59lbs/in front & 475.98lbs rear)
Dropzone: Spring Rate: (? Front/? Rear) - Drop: (2in all around)

Eibach Pro-kit: Spring Rate: (15-20% more than stock) - Drop: (1in Front/1.1in rear)

Eibach Sportline: Spring Rate: (20-25% more than stock) - Drop: (1.4in Front/1.5in Rear)

H&R Sport: Spring Rate: (25-30% more than stock) - Drop: (2in all around)

Neupseed Race: Spring Rate: (200 Front/280 Rear) - Drop: (2in all around)

Neupseed Sport: Spring Rate: (200 Front/280 Rear) - Drop: (1.5in Front/1.5in Rear)

Progress: Spring Rate: (280 Front/500 Rear) - Drop: (1.8in Front/1.5in Rear)

Sprint: Spring Rate: (20-25% more than stock) - Drop: (2in all around)

Spoon Progressive: Spring Rate: (413 Front / 458 Rear) - Drop: (1.5-1.7in all around)

Tanabe df210: Spring Rate: (10-15% more than stock) Drop: (2in Front/2.3in Rear)

Tanabe nf210: Spring Rate: (10-15% more than stock) Drop: (1.5in all around)

Tanabe gf210: Spring Rate: (20-30% more than stock) Drop: (1.3in Front/1.5in Rear)

Tein H Tech: Spring Rate: (257 Front/476 Rear) Drop: (.8in Front/.7in Rear)

Tein S Tech: Spring Rate: (280 Front/515 Rear) Drop: (1.4in Front/1.3in Rear)

[Ground Controls]
Dropzone: Spring Rate: (? Front/? Rear)

Ground Control EP3 kit: Spring Rate: (375 Front/450 Rear)

Skunk2 Coilovers: Spring Rate: (440 Front/330 Rear)

[Full Coil-overs] Spring & Shock (fixed height)

Mugen: Spring Rate: (283 Front/439 Rear) Drop: (1.4in all around)

Honda Factory Performance: Spring Rate: (? Front/? Rear) Drop: (?in all around) - very similar to the mugen kit, awaiting specs

[Full Coil-overs] Spring & Shock (adj height)

Buddy Club Racing Spec: Spring Rate (559 Front/894 Rear) (Adj ?? min - ?? max)

JIC FLT-A2: Spring Rate: (504 Front/560 Rear) Drop: (Adj stock - 3.5in max)

KW V2: Spring Rate: (340 Front/515 Rear) Drop: (Adj 1.4in min - 2.6in max)

Progress C1: Spring Rate: (350 Front/640 Rear) Drop: (Adj 1in min - 4in max)

Tein Basic: Spring Rate: (336 Front/448 Rear) Drop: (Adj ?? min - ?? max

Tein Type Flex: Spring Rate: (448 Front/559 Rear) Drop: (Adj ?? min - ?? max)

V2 Coilover kit from KW: Spring Rate: (340 Front/500 Rear) Drop: (Adj 1.4 min - 2.6 max)

More Coilover Set Rates

Buddy Club n+:
Spring Rate: 10k Front/14k Rear

Buddy Club rsd:
Spring Rate: 10k Front/16k Rear

D2:
Spring Rate: 8.7k Front/8.0k Rear

Form and Function:
8k Front/6k Rear

KW Variant 2:
6.1k Front/9.2k Rear

Megan Street:
8k Front/10k Rear

Megan Track (DC5 specific):
12k Front/16k Rear

Progress:
6.3k Front/11.6k Rear

Skunk2 Pro S:
12k Front/8k Rear

Tanabe Pro S:
6k Front/8k Rear

Tanabe Pro Type 2:
8k Front/8k Rear

Tien Basic:
6k Front/8k Rear

Tien SS:
6k Front/8k Rear

Tien Flex:
12k Front/14k Rear

Tien Flex (DC5 Specific):
14k Front/16k Rear

[conversion rates]
1 kg/mm = 55.88 lb/in
1 N/mm = 5.588 lb/in


[What is Progressive Spring Rate?]
Progressive rate springs are likely

[b_ron]

any way to tell if your dc5r is 02-04 or 05-06?

[Hasbro]

Iirc, 05/06 RSXes have the front right spring wound opposite of the other three.

[jjr007]

Curry Honda advertises the a-spec as 2002 to 2006, no distinction between years, and lowering of 1 inch. I read on an Acura forum, that the a-spec for 2005-2006,
said 10% increase over stock on the box, but on the 2002-2004, it did not say. I would think that they would be identical, no reason to change what ain't broke.