06+ Civic Si 2/4dr Spring Rates and Drop Guide

***FA5SI*** · 06-20-2007, 07:35 PM

Here are some springs I did research on and also contacted several companies to get information on the drop and spring ratings... Please add any other lowering springs spec/information thats not listed, and I will add it on the list

Company //// Ride Height F/R //// Spring Rate F/R :: (L) Linear (P) Progressive

Stock '06 Si Coupe //// 0" / 0" //// (L) 200 lbs. / 230 lbs.
Eibach ProKit//// 1.0" / 1.2” //// Coupe (P) 137-222 in. lbs / 143-262 in. lbs
Eibach ProKit//// 1.2" / 1.0” //// Sedan (P) 137-222 in. lbs / 142-262 in. lbs

Eibach Sportlines //// 1.4" / 1.4” //// (P) 125-222 in. lbs / 131-262 in. lbs

Skunk 2 //// 1.5” / 1.4” //// (P) 135-184 in. lbs / 125-273 in. lbs

Tein H-Tech //// 0.79” / 0.67” //// (P) 220 in. lbs / 250 in. lbs

Tein S-Tech //// 1.54” / 1.42” //// (P) 230 in. lbs / 270 in. lbs

Tanabe Sustec GF210 //// 1.0” / 0.75” //// (L) 187 in. lbs / 225 in. lbs ; +20-30% est.

Progress Group //// 1.3” / 1.2” //// (L) 240 in. lbs / 330 in. lbs

Neuspeed Sport //// 1.6” / 1.6” //// (P)+-218 in. lbs / +-448 in. lbs

Neuspeed Race//// 2.0” / 2.0” //// (P)+-303in. lbs / +-460 in. lbs

H&R Sport //// 1.5” / 1.3” //// (P) N/A in. lbs / N/A in. lbs

Comptech Sport //// 1.0” / 1.2” //// (P) N/A in. lbs / N/A in. lbs

HFP Springs //// 1.0” / 1.0” //// (P) N/A in. lbs / N/A in. lbs

B+G Sport //// 1.6” / 1.6” //// (P) 25%+ in. lbs / 25%+ in. lbs

Swift Springs USA

Swift Sport Springs

CIVIC SI--2 Door-FG2--Front 2.3-4.0kg/mm--129-224lbs/in--Drop 30mm/ 1.2in----Rear 3.2-4.6kg/mm--179-258lbs/in--Drop 20mm/ 0.8in
CIVIC SI--4 Door-FA5--Front 2.3-4.0kg/mm--129-224lbs/in--Drop 30mm/ 1.2in----Rear 3.2-4.6kg/mm--179-258lbs/in--Drop 25mm/ 1.0in
CIVIC-----2 Door-FG1--Front 2.3-4.0kg/mm--129-224lbs/in--Drop 25mm/ 1.0in----Rear 3.2-4.6kg/mm--179-258lbs/in--Drop 15mm/ 0.6in
CIVIC-----4 Door-FA1--Front 2.3-4.0kg/mm--129-224lbs/in--Drop 25mm/ 1.0in----Rear 3.2-4.6kg/mm--179-258lbs/in--Drop 20mm/ 0.8in

Part Number----4H913

SiRyan · 06-20-2007, 07:39 PM

Nice, you forgot comptech....

***Zeuceone*** · 06-20-2007, 07:43 PM

no he didnt. third one from the bottom.

SiRyan · 06-20-2007, 07:47 PM

sticky this thread....

***Ruthless909*** · 06-20-2007, 07:50 PM

Quote:

Originally Posted by SiRyan

sticky this thread....

x2......

samx109 · 06-20-2007, 08:38 PM

sticky RIGHT NOW

repped +1

***06NaviEX*** · 06-20-2007, 09:53 PM

Nice work! +rep

skandal57 · 06-20-2007, 09:56 PM

does anyone know any numbers on the HFP kit? i havent beem able to find out anything

02SilverSiHB · 06-20-2007, 09:59 PM

nice work. Not surprised about eibach's numbers....they very rarely will tell you due to competition.

juji88 · 06-20-2007, 10:53 PM

sticky this

Hondacivicsi23 · 06-20-2007, 11:10 PM

I thought skunk 2 was a 2 or 2.25 in. drop .......

***FA5SI*** · 06-20-2007, 11:20 PM

Quote:

Originally Posted by Hondacivicsi23

I thought skunk 2 was a 2 or 2.25 in. drop .......

I reconfirmed with them they said it was 1.5/1.4... hmmm can anybody else clarify this?

brthorner · 06-20-2007, 11:30 PM

Here is some more info for the file:

Tanabe makes two versions of the GF210...one for the LX/EX and one for the Si. I have the details on the Si model:

They are also Linear.
Front drop = 0.6"
Rear drop = 0.5"

Front rate = 3.4kg/mm
Rear rate = 4.1kg/mm

They also make their DF210 springs for the Si. The GF210 series is described as being 20% to 30% stiffer than stock, whereas the DF210 series is described as being 15% stiffer than stock, yet these two sets of springs have the same spring rates! The only difference is the drop. However, the GF210 lowers the car 0.1" more in the front, whereas the DF210 lowers the car 0.1" more in the rear. But obviously Tanabe feels really strongly about these particular spring rates, for some reason. Anyways, here are the specs on the DF210 springs as well:

These are also linear.
Front drop = 0.9"
Rear drop = 1.0"

Front rate = 3.4kg/mm
Rear rate = 4.1kg/mm

I almost bought the GF210 springs, but then I found out that Swift is going to be releasing their Sport Mach lowering springs for the Si in the next couple of months, so I'm waiting to see the details on those before making my final purchase...but the Swift's basically already have my vote.

Although, based on the specs above (and thanks FA5SI!!), the Progress springs kinda intrigue me now, particularly since they sell for like $150 or something. Does anyone have them installed, and if so, how do you like them??

Brian

irichard · 06-21-2007, 12:54 AM

remember to say which fits on what (2dr or 4dr)

***Zeuceone*** · 06-21-2007, 02:38 PM

theres also the vaoghtlan or something like that. mfinlay04 has them.

**Yodums** · 06-21-2007, 03:04 PM

This thread has been stuck.

brthorner · 06-21-2007, 08:00 PM

In order to convert lbs/in to kg/mm, multiply the lbs x 0.0178579673.

So the Progress springs for example are 4.3kg/mm in front, and 5.9kg/mm in the rear.

Highrev1 · 06-30-2007, 06:28 PM

FG Civic Si FG Civic LX
Front spring rate 200 170
Rear spring rate 230 200

Wheel Rate Estimates
Front wheel rate 190 161.5
Rear wheel rate 138 120

Wheel F/R bias 1.38 1.35

Firestrife · 06-30-2007, 06:36 PM

nice thread definitely sticky.
How bout some numbers on the Mugen suspension?

Quickkidd · 06-30-2007, 06:55 PM

i remembered that tai from corsport said that the skunk 2 springs will lower it around 2.25"

06-20-2007, 07:35 PM	#1 (permalink)
*FA5SI* Hot n Spicy Join Date: Apr 2007 Location: San Diego Age: 21 Posts: 1,206 iTrader: 25 / 100%	06+ Civic Si 2/4dr Spring Rates and Drop Guide Here are some springs I did research on and also contacted several companies to get information on the drop and spring ratings... Please add any other lowering springs spec/information thats not listed, and I will add it on the list Company //// Ride Height F/R //// Spring Rate F/R :: (L) Linear (P) Progressive *Stock '06 Si Coupe //// 0" / 0" //// (L) 200 lbs. / 230 lbs.* *Eibach ProKit//// 1.0" / 1.2” //// Coupe (P) 137-222 in. lbs / 143-262 in. lbs* *Eibach ProKit//// 1.2" / 1.0” //// Sedan (P) 137-222 in. lbs / 142-262 in. lbs* *Eibach Sportlines //// 1.4" / 1.4” //// (P) 125-222 in. lbs / 131-262 in. lbs* *Skunk 2 //// 1.5” / 1.4” //// (P) 135-184 in. lbs / 125-273 in. lbs* Tein H-Tech //// 0.79” / 0.67” //// (P) 220 in. lbs / 250 in. lbs Tein S-Tech //// 1.54” / 1.42” //// (P) 230 in. lbs / 270 in. lbs *Tanabe Sustec GF210 //// 1.0” / 0.75” //// (L) 187 in. lbs / 225 in. lbs ; +20-30% est.* *Progress Group //// 1.3” / 1.2” //// (L) 240 in. lbs / 330 in. lbs* *Neuspeed Sport //// 1.6” / 1.6” //// (P)+-218 in. lbs / +-448 in. lbs* *Neuspeed Race//// 2.0” / 2.0” //// (P)+-303in. lbs / +-460 in. lbs* *H&R Sport //// 1.5” / 1.3” //// (P) N/A in. lbs / N/A in. lbs* *Comptech Sport //// 1.0” / 1.2” //// (P) N/A in. lbs / N/A in. lbs* *HFP Springs //// 1.0” / 1.0” //// (P) N/A in. lbs / N/A in. lbs* *B+G Sport //// 1.6” / 1.6” //// (P) 25%+ in. lbs / 25%+ in. lbs* Swift Springs USA Swift Sport Springs CIVIC SI--2 Door-FG2--Front 2.3-4.0kg/mm--129-224lbs/in--Drop 30mm/ 1.2in----Rear 3.2-4.6kg/mm--179-258lbs/in--Drop 20mm/ 0.8in CIVIC SI--4 Door-FA5--Front 2.3-4.0kg/mm--129-224lbs/in--Drop 30mm/ 1.2in----Rear 3.2-4.6kg/mm--179-258lbs/in--Drop 25mm/ 1.0in CIVIC-----2 Door-FG1--Front 2.3-4.0kg/mm--129-224lbs/in--Drop 25mm/ 1.0in----Rear 3.2-4.6kg/mm--179-258lbs/in--Drop 15mm/ 0.6in CIVIC-----4 Door-FA1--Front 2.3-4.0kg/mm--129-224lbs/in--Drop 25mm/ 1.0in----Rear 3.2-4.6kg/mm--179-258lbs/in--Drop 20mm/ 0.8in Part Number----4H913 Last edited by FA5SI; 12-24-2008 at 03:06 AM. Reason: Updated Dec 2008

06-21-2007, 03:04 PM	#16 (permalink)
Yodums Scrodums Join Date: May 2006 Location: Ottawa, Canada Posts: 8,924 The Stig iTrader: 10 / 100%	This thread has been stuck. __________________ 2007 Taffeta White Civic Si Coupe

06-30-2007, 06:55 PM	#20 (permalink)
Quickkidd Senior Member Join Date: Nov 2005 Location: South Bay Age: 21 Posts: 198 iTrader: 2 / 100%	i remembered that tai from corsport said that the skunk 2 springs will lower it around 2.25" Last edited by Quickkidd; 06-30-2007 at 07:02 PM.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

06-20-2007, 07:39 PM	#2 (permalink)
SiRyan Senior Member Join Date: Aug 2006 Location: Bay Area,Ca. Posts: 6,287 Ryan iTrader: 18 / 100%	Nice, you forgot comptech....

06-20-2007, 07:47 PM	#4 (permalink)
SiRyan Senior Member Join Date: Aug 2006 Location: Bay Area,Ca. Posts: 6,287 Ryan iTrader: 18 / 100%	sticky this thread....

06-20-2007, 08:38 PM	#6 (permalink)
samx109 Senior Member Join Date: Nov 2006 Location: Laurel, MD Posts: 7,526 Sam iTrader: 21 / 100%	sticky RIGHT NOW repped +1

06-20-2007, 09:53 PM	#7 (permalink)
*06NaviEX* 2008 HRP FA5 Join Date: Feb 2007 Location: Frisco, TX Posts: 586 Brian iTrader: 6 / 100%	Nice work! +rep

06-20-2007, 09:56 PM	#8 (permalink)
skandal57 Senior Member Join Date: May 2007 Location: Lehigh Acres, FL. Posts: 522 iTrader: 1 / 100%	does anyone know any numbers on the HFP kit? i havent beem able to find out anything

06-20-2007, 09:59 PM	#9 (permalink)
02SilverSiHB Senior Member Join Date: Oct 2005 Location: Misawa, Japan Age: 32 Posts: 1,287 iTrader: 5 / 100%	nice work. Not surprised about eibach's numbers....they very rarely will tell you due to competition.

06-20-2007, 10:53 PM	#10 (permalink)
juji88 Senior Member Join Date: Jan 2007 Posts: 105 iTrader: 0 / 0%	sticky this

06-20-2007, 11:10 PM	#11 (permalink)
Hondacivicsi23 Senior Member Join Date: Jan 2007 Location: Orlando,Fl Posts: 1,029 Michael iTrader: 6 / 100%	I thought skunk 2 was a 2 or 2.25 in. drop .......

06-20-2007, 11:30 PM	#13 (permalink)
brthorner Senior Member Join Date: Nov 2006 Location: Walnut Creek, CA Posts: 121 Brian iTrader: 0 / 0%	Here is some more info for the file: Tanabe makes two versions of the GF210...one for the LX/EX and one for the Si. I have the details on the Si model: They are also Linear. Front drop = 0.6" Rear drop = 0.5" Front rate = 3.4kg/mm Rear rate = 4.1kg/mm They also make their DF210 springs for the Si. The GF210 series is described as being 20% to 30% stiffer than stock, whereas the DF210 series is described as being 15% stiffer than stock, yet these two sets of springs have the same spring rates! The only difference is the drop. However, the GF210 lowers the car 0.1" more in the front, whereas the DF210 lowers the car 0.1" more in the rear. But obviously Tanabe feels really strongly about these particular spring rates, for some reason. Anyways, here are the specs on the DF210 springs as well: These are also linear. Front drop = 0.9" Rear drop = 1.0" Front rate = 3.4kg/mm Rear rate = 4.1kg/mm I almost bought the GF210 springs, but then I found out that Swift is going to be releasing their Sport Mach lowering springs for the Si in the next couple of months, so I'm waiting to see the details on those before making my final purchase...but the Swift's basically already have my vote. Although, based on the specs above (and thanks FA5SI!!), the Progress springs kinda intrigue me now, particularly since they sell for like $150 or something. Does anyone have them installed, and if so, how do you like them?? Brian

06-21-2007, 12:54 AM	#14 (permalink)
irichard Senior Member Join Date: Sep 2005 Posts: 1,102 **** iTrader: 1 / 100%	remember to say which fits on what (2dr or 4dr)

06-21-2007, 08:00 PM	#17 (permalink)
brthorner Senior Member Join Date: Nov 2006 Location: Walnut Creek, CA Posts: 121 Brian iTrader: 0 / 0%	In order to convert lbs/in to kg/mm, multiply the lbs x 0.0178579673. So the Progress springs for example are 4.3kg/mm in front, and 5.9kg/mm in the rear.

06-30-2007, 06:28 PM	#18 (permalink)
Highrev1 Senior Member Member Join Date: Mar 2006 Location: PM me NothernNJ Installs/Details Posts: 3,877 iTrader: 1 / 100%	FG Civic Si FG Civic LX Front spring rate 200 170 Rear spring rate 230 200 Wheel Rate Estimates Front wheel rate 190 161.5 Rear wheel rate 138 120 Wheel F/R bias 1.38 1.35

06-30-2007, 06:36 PM	#19 (permalink)
Firestrife Senior Member Join Date: May 2007 Location: Gainesville, FL Age: 21 Posts: 4,012 Keenan iTrader: 9 / 100%	nice thread definitely sticky. How bout some numbers on the Mugen suspension?