What are non-SI coupe and sedan spring rates? Internet info is very inconsistent - 8th Generation Honda Civic Forum
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Old 12-11-2017, 11:36 AM   #1 (permalink)
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What are non-SI coupe and sedan spring rates? Internet info is very inconsistent

I am very unclear on what are non-SI coupe and sedan spring rates. The info here and elsewhere on the internet is very, very inconsistent. Does anybody have any hard info. I'll copy and paste what info I have below. I gave up after there were too many inconsistent sources of info.



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Quote:
Originally Posted by scott4 View Post
(link)
  1. Sedan: 140f/145r - 24.2/10 (swayb)
  2. Coupe: 170f/200r - 25.4/11 (swayb)
  3. Sedan Si: TBD/TBD - 27/17 (swayb)
  4. Coupe Si: - 200f/230r - 28/17 (swayb)
  5. HFP (info here)
Quote:
Originally Posted by scott4 View Post
(link)
To achieve sport coupe performance, the Civic Coupe has the following exclusive suspension tuning compared to the 2006 Civic Sedan:

Front spring rate increases 20 percent
Rear spring rate increases 28 percent
Sport tuned front and rear damper settings
Solid front 25.4 x 3.5 mm tubular stabilizer bar (up from 24.2 x 3.0 mm)
Solid rear 11.0 mm stabilizer bar (up from 10.0 mm)

The math doesn't line up perfectly. Lets double-check.
(Honda Link)
(Archive) (link)
Civic Coupe Exclusive Suspension Tuning
To achieve sport coupe performance, the Civic Coupe has the following exclusive suspension tuning compared to the 2006 Civic Sedan:

Front spring rate increases 20 percent
Rear spring rate increases 28 percent
Sport tuned front and rear damper settings
Solid front 25.4 x 3.5 mm tubular stabilizer bar (up from 24.2 x 3.0 mm)
Solid rear 11.0 mm stabilizer bar (up from 10.0 mm)

Civic Si Exclusive Suspension Tuning
To achieve razor-like performance, the Civic Si has the following exclusive suspension tuning compared to the 2006 Civic Coupe:

Front spring rate increases 17 percent
Rear spring rate increases 14 percent
Track tuned front and rear damper settings
Solid front 28.0 mm stabilizer bar (up from 25.4 mm tubular)
Solid rear 17.0 mm stabilizer bar (up from 11.0 mm)
Heavy duty front wheel hub and bearings
Heavy duty front and rear lower control arms
Coupe Si: - 200 front / 230 rear (looks accurate here)

Y x 1.17 = 200
Y = Coupe front spring rate
Y = 170.94

Z x 1.14 = 230
Z = Coupe rear spring rate
Z = 201.754

A x 1.2 = 170.94
A = Sedan front spring rate
A= 1.42.45

B x 1.28 = 201.754
B = Sedan rear spring rate
B = 157.62

The first group of figures isn't correct. The list should say
  1. Sedan: ~142.5f/~157.6r - 24.2/10 (swayb)
  2. Coupe: ~170.9f/~201.8r - 25.4/11 (swayb)
  3. Sedan Si: TBD/TBD - 27/17 (swayb)
  4. Coupe Si: - 200f/230r - 28/17 (swayb)
  5. HFP (info here)

------------------------------------------------------------

Looks like the coupe rear rate got softer in 2008 -

Source 1

2008 Civic changes...

* New rear upper arm that decreases the amount of rear camber from -1.5* to -0.75*.

* For all 2DR models the rear spring has changed to the 4DR spring (lower rate).

* DX models now use the LX/EX Coupe (SVA) damper, not the Si Coupe (SVB) damper.

This was all done because of the camber change that was necessary to prevent abnormal tire wear (especially prevalent on Canadian market cars). The camber change caused less rear grip, so the engineers had to soften the rear... Perfect example of Honda's insurance lawyers defeating the engineers I suppose. However, my contact has driven both back to back and said that while the new setup is definitely more conservative, its not horrible. He bets that most drivers would not be able to pickup the difference.

BTW, I still don't know if the new rear upper arm has a unique part number or if it will use the existing number.

Anthony "Mario" Crea
NNJR-SCCA
(Source 2)
Quote:
Originally Posted by honda93 View Post
Don't forget, all non-Si Coupes are now running the non-Si Sedan rear springs for 2008; so the number for the rear spring on 2008+ cars drops from 200 lbs./in to 145-150 lbs./in

Anthony "Mario" Crea
NNJR-SCCA
------------------------------------------------------------

Part Number Check

2006
Coupe Front Spring R - 51401-SVA-A02
Coupe Front Spring L - 51406-SVA-A02
Coupe Front Strut Assy R - 51601-SVA-A04
Coupe Front Strut Assy L - 51602-SVA-A07

Coupe Rear Spring - 52441-SVA-A01
Coupe Rear Shock Assy - 52610-SVA-A05

Sedan Front Spring R - 51401-SNA-A13
Sedan Front Spring L - 51402-SNA-A02
Sedan Front Strut Assy R - 51601-SNA-A25
Sedan Front Strut Assy L - 51602-SNA-A25

Sedan Rear Spring - 52441-SNA-A21
Sedan Rear Shock Assy - 52610-SNE-A03
2007
Coupe Front Spring R - 51401-SVA-A02
Coupe Front Spring L - 51406-SVA-A02
Coupe Front Strut Assy R - 51601-SVA-A07
Coupe Front Strut Assy L - 51602-SVA-A15

Coupe Rear Spring - 52441-SVA-A01
Coupe Rear Shock Assy - 52610-SVA-A05

Sedan Front Spring R - 51401-SNA-A13
Sedan Front Spring L - 51406-SNA-A13
Sedan Front Strut Assy R - 51601-SNA-A25
Sedan Front Strut Assy L - 51602-SNA-A25

Sedan Rear Spring - 52441-SNA-A21
Sedan Rear Shock Assy - 52610-SNE-A03
2008
Coupe Front Spring R - 51401-SVA-A02
Coupe Front Spring L - 51406-SVA-A02
Coupe Front Strut Assy R - 51601-SVA-A07
Coupe Front Strut Assy L - 51602-SVA-A15

Coupe Rear Spring - 52441-SVA-A01
Coupe Rear Shock Assy - 52610-SVB-A05

Sedan Front Spring R - 51401-SNA-A13
Sedan Front Spring L - 51406-SNA-A13
Sedan Front Strut Assy R - 51601-SNA-A25
Sedan Front Strut Assy L - 51602-SNA-A25

Sedan Rear Spring - 52441-SNA-A21
Sedan Rear Shock Assy - 52610-SNE-A03
2009
Coupe Front Spring R - 51401-SVA-A02
Coupe Front Spring L - 51406-SVA-A02
Coupe Front Strut Assy R - 51601-SVA-A07
Coupe Front Strut Assy L - 51602-SVA-A07

Coupe Rear Spring - 52441-SNA-A02
Coupe Rear Shock Assy - 52610-SVB-A05
...... cut....


This info already doesnt work with the claim that coupes got a softer rear in 2008. The coupes got the exact same PN for their rear damper (52610-SVB-A05) as the SI in 2007-2008. Why the hell would they want to use a SI damper in the rear for a soft spring?

There are too many inconsistencies with this info. This doesn't make sense.

Look below. A change happened in the rear suspension 2009 for coupes. Who the hell knows what spring rate it was, but it required an SI damper. I do not think that suggests a softer spring.

SPRING, REAR
Part Number: 52441-SVA-A01

Honda Civic 5AT DX 2D 2006, 2007, 2008, 2009, 2010, 2011
Honda Civic 5AT EX 2D 2006, 2007, 2008
Honda Civic 5AT EXL 2D 2008
Honda Civic 5AT EXLN 2D 2008
Honda Civic 5AT EXN 2D 2006, 2007, 2008
Honda Civic 5AT LX 2D 2006, 2007, 2008
Honda Civic 5MT DX 2D 2006, 2007, 2008, 2009, 2010, 2011
Honda Civic 5MT EX 2D 2006, 2007, 2008
Honda Civic 5MT EXL 2D 2008
Honda Civic 5MT EXLN 2D 2008
Honda Civic 5MT EXN 2D 2006, 2007, 2008
Honda Civic 5MT LX 2D 2006, 2007, 2008
SPRING, REAR
Part Number: 52441-SNA-A02

Honda Civic 5AT EX 2D 2009, 2010, 2011
Honda Civic 5AT EXL 2D 2009, 2010, 2011
Honda Civic 5AT EXLN 2D 2009, 2010, 2011
Honda Civic 5AT EXN 2D 2009, 2010, 2011
Honda Civic 5AT LX 2D 2009, 2010, 2011
Honda Civic 5MT EX 2D 2009, 2010, 2011
Honda Civic 5MT EXL 2D 2009, 2010
Honda Civic 5MT EXLN 2D 2009, 2010
Honda Civic 5MT EXN 2D 2009, 2010
Honda Civic 5MT LX 2D 2009, 2010, 2011
SHOCK ABSORBER ASSEMBLY, REAR
Part Number: 52610-SVB-A05

Honda Civic 5AT DX 2D 2007, 2008, 2009, 2010, 2011
Honda Civic 5AT EX 2D 2008, 2009, 2010, 2011
Honda Civic 5AT EXL 2D 2008, 2009, 2010, 2011
Honda Civic 5AT EXLN 2D 2008, 2009, 2010, 2011
Honda Civic 5AT EXN 2D 2008, 2009, 2010, 2011
Honda Civic 5AT LX 2D 2008, 2009, 2010, 2011
Honda Civic 5MT DX 2D 2007, 2008, 2009, 2010, 2011
Honda Civic 5MT EX 2D 2008, 2009, 2010, 2011
Honda Civic 5MT EXL 2D 2008, 2009, 2010
Honda Civic 5MT EXLN 2D 2008, 2009, 2010
Honda Civic 5MT EXN 2D 2008, 2009, 2010
Honda Civic 5MT LX 2D 2008, 2009, 2010, 2011
Honda Civic 6MT SI 2D 2006, 2007, 2008, 2009, 2010, 2011
Honda Civic 6MT SI-HPT 2D 2010, 2011
Honda Civic 6MT SI-N 2D 2006, 2007, 2008, 2009, 2010, 2011
Honda Civic 6MT SI-ST 2D 2006, 2007, 2008, 2009
Honda Civic 6MT SI-STN 2D 2006, 2007, 2008, 2009
Honda Civic 6MT SIHPTN 2D 2010
SHOCK ABSORBER ASSEMBLY, REAR
Part Number: 52610-SVA-A05
Honda Civic 5AT EX 2D 2006, 2007
Honda Civic 5AT EXN 2D 2006, 2007
Honda Civic 5AT LX 2D 2006, 2007
Honda Civic 5MT EX 2D 2006, 2007
Honda Civic 5MT EXN 2D 2006, 2007
Honda Civic 5MT LX 2D 2006, 2007


Good grief. This info doesn't work with an alleged change to softer springs for coupes in 2008 at all.


Last edited by scott4; 12-11-2017 at 01:36 PM.
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