I'm searched out... Maybe someone can school me... I'm looking for spring rates on the Eibach Pro-Kit and Ground-controls...
I don't intend on tracking my daily driver so I'm looking for something to eliminate some wheel-gap, and keep the same ride.

Everyone's opinion is subject to their perspective and perception of "ride quality". So, I figure the best way to figure this for myself is to study spring rates.

(I suppose "progressive rate" springs are not something typically listed as a static rate.)

Here's what I've found: (and if anyone can contribute please do)

OEM Springs: EDIT
NOTES: http://www.s2000.com/2004.php
OEM:
00-01 - Fr: 218(3.9) - Rr: 291(5.2)
02-03 - Fr: 240(4.3) - Rr: 230(4.1) <<est.
2004 (this is a tough one...)
If calculated against 00-01 rates (based on quote above)
Fr: 233(4.16) - Rr: 262(4.68) (218 - 7%= 233) (291 - 10%= 262)
If calculated against 02-03 rates
Fr: 256(4.57) - Rr: 207(3.7) (probably incorrect)

KG/mm sport:
Fr: 398(7.0) - Rr: 448(8.0)

Neuspeed:
Fr: 280(5.0) - Rr: 215(3.8)

Tein S-Tech:
Fr: 297(5.3) - Rr: 364(6.5)

Espelir Active Super Down
Fr: 313.6(5.5) - Rr: 392(7.0)

Eibach Pro-Kit EDIT
Fr: 262(4.67) - Rr: 342(6.1) < Thanks s2ka !

Eibach Ground-Control
??? (build to spec)

**NEW**

Buddy Club coilovers < Thanks Lig ! EDIT
Fr: 569(10) - Rr: 569(10) (Donate here for his chiropractic bills)

H&R coilovers
Fr: 345(6.16) - Rr: 345(6.16) < Thanks Ludedude !

Spoon Sports Progressive Springs
Fr: 263(4.7) - Rr: 386(6.9)

Tanabe GF210
Fr: 283(5.0) - Rr: 378(6.75)

Tein Type CS coilover
Fr: 224(4.0) - Rr: 336(6.0)

Tein Type RA coilover
Fr: 559(10) - Rr: 559(10)

Backyard Special European R Springs
Fr: 262(4.6) Rr: 335(5.9)

 

GC recommends 340F/380R but will configure to your spec.

 

FWIW, I have 380's all around... I don't believe they are too harsh. My car is not exactly a daily driver, but I have put on 47k+ miles on her in just under two years. I'll be using 500/550 next time at the track though.

 

I'd prefer to keep the stock feel, but get the impression that if I lower it an inch, and keep the same "rate" I run the risk of bottom-ing out the shock.
-true?

Would it be unreasonable to get GC's with stock rates?
240(4.3) - Rr: 230(4.1)

Another thing;
What's up with the rear rates having bias over front on certain models?

what's the point there?

thanks!

 

If you lower 1" and retain OEM rates you will probably hit your bumpstops. Front and rear rates effect handling (oversteer/understeer). Basically, stiffer in back = more oversteer, stiffer in front = more understeer. I think running them pretty even (like GC 340/380) works reasonably well. Skip, I could have used stiffer GC spring this weekend at Summit Point but the OEM shocks probably can't handle anything much stiffer.

 

Eibach Pro Kit:

Fr: 262 - Rr: 342

 

Hey, does anybody know the spring rate of H&R springs?

 

Hey, does anybody know the spring rate of H&R springs?

With the spring rate being greater in the front, (ie.Neuspeed,KG/mmSport) ,the intent is to dial out oversteer.

 

I'm not sure where you found this but, YOU are the freakin man!

 

oryanh, can you verify your OEM specifications? You're showing the '04 cars as having a significantly STIFFER rear than the '03 cars...?