[twiSTies]

This used to be a .jpg file that was hosted elsewhere and hosts come and go so I've decided to just type this out so it won't get lost again. This also allows for easier editing in the future as more releases and knowledge are attained.

            2004-2007 STi Aftermarket Spring Rate and Drop
 
Spring:                Rate (F,R, lb/min):             Drop(F,R,mm):
 
Stock                   224F/194R *                       0F/0R *
Cobb Sport              280F/243R *                     -51F/-38R *
Crucial Racing          257F/217R *                     -12.5F/-9R *
Eibach Pro-Kit          ???F/???R                       -30F/-20R *
Espelir GT              280F/230R !                     -30F/-20R !  
Ground Control          300F/300R *                      0 to -38 F&R *
Perrin                  ???F/???R                       -48F/-38R *
Prodrive                ???F/???R                       -15F/-10R ! 
RCE Blacks              285F/269R *                     -15F/-10R *
RCE Yellows             295F/275R *                     -23F/-20R *
RSR Ti2000              268F/194R *                     -41F/-36R *
STi Pinks               257F/217R *                     -20F/-20R 
STi Arai                342F/286R *                     -15F/-15R 
Swift Sport Mach        252F/224R *                     -30F/-30R ! 
Swift R Spec            285F/275R *                     -20F/-15R * (2004 Spec)
Swift R Spec            285F/275R *                     -25F/-25R * (2005+ Spec)
Tanabe DF210            263F/246R *                     -33F/-20R *
Tanabe GF210            241F/224R *                     -30F/-20R * (2004 Spec)
Tanabe GF210            324F/246R *                     -25F/-13R * (2005+ Spec)
Tein H-Tech             229F/196R *                     -26F/-9R  * (2004 Spec)
Tein H-Tech             230F/196R *                     -29F/-17R * (2005+ Spec)
Tein S-Tech             252F/219R *                     -41f/-24R * (2004 Spec)
Tein S-Tech             252F/219R *                     -44F/-32R * (2005+ Spec)

* = verified official info from mfg
! = info from from a vendor

No notation indicates best guess from experience

All drops are indicated as referenced to Stock 2004/2005 STi. When applied to a 2006/2007 STi, the front drop will be slightly less and the rear drop will be slightly more.

Stock Ride Height is measured as 386F/363R. See service manual for standard method of measurement.

All springs are progressive except Ground Control. Final Rate near end of strut travel is specified table value. Some are less progressive than others and may feel 'stiffer'.

[boondocksaint]

Well done. Thank you for this. As more become available, we can now update it.

[twiSTies]

Originally Posted by boondocksaint

Well done. Thank you for this. As more become available, we can now update it.

No problem, I've been meaning to do this for over a year now ever since it got taken down by a former member and Niveks link went dead.

It just seemed like with all the spring questions that get posted here (although it seems we've moved on to coilovers as a community, haha) that there should be a FAQ or chart to show what the specs are on them all. Here's that missing piece for the community.

[boondocksaint]

Oh there are still tons of spring questions. A good companion to the above post might be a Stretch "do they coil bind?" column.

I tried to gather all of the suspension knowledge in one place in a sticky here in the suspension forum but I simply don't have the time or the knowledge to maintain it.

[blindfold]

thanks a lot

[ButtDyno]

Here's the list I put together for the NASIOC Lowering Spring FAQ:
Google Docs - Shocks/struts

Just in case I have something you don't (or vice versa)

john

[twiSTies]

Originally Posted by ButtDyno

Here's the list I put together for the NASIOC Lowering Spring FAQ:
Google Docs - Shocks/struts

Just in case I have something you don't (or vice versa)

john

Thank you! I'll be sure to look through there when I get some time and add to the list. Feel free to use whatever you need from this one.

[gasgas200xc]

They should sticky this thread...

[snorky]

Originally Posted by gasgas200xc

They should sticky this thread...

+1000

thanks twisties for making the list, it will be invaluable to many in the future i'm sure.

I just realized that I always called my Arai springs Pinks. I didn't notice the difference until now. Who would have thought? I'm a noob! I sold them as pinks too.

[boondocksaint]

Added to threads of interest sticky.

[scoobster]

Thanks for the info

[hypa]

wow, great thread.
I'm amazed as to how low the Cobb's drop!

[RXTC]

Swift Spec R updates...
04/05 rates from their website are different. Perhaps changed?

Front 285 / Rear 275

http://www.swiftsprings.com/file/SportSprings.pdf

[twiSTies]

Originally Posted by RXTC

Swift Spec R updates...
04/05 rates from their website are different. Perhaps changed?

Front 285 / Rear 275

http://www.swiftsprings.com/file/SportSprings.pdf

good find, updated the chart. i got the numbers i had from TiC's website, so maybe things did change.

[TheHammer]

Thanks for this info