G35/350Z aftermarket coilover, springs and shocks spec's - 6MT.net Infiniti G35/G37/GTR Forums
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Default G35/350Z aftermarket coilover, springs and shocks spec's

Reposted with all due recognition to Gsedan35's efforts in compiling and sharing this extraordinary list. It has become the defacto resource, and remains subject to revision as information becomes available. Thank you Jim! Mods please Sticky.

Quote:
Just posting this to provide information for more informed choices.

NOTE!: Any aftermarket 350Z spring will lower a coupe a additional ½” over and beyond the published drop amount for the 350Z. For sedan owners, the same applies to you, except you will gain a additional 1”, not just ½”

Oem springs G35 coupes with oem 17’s & 18’s G35 sedan’s with sport suspension 350Z’s 2003/2004
Front:314 Rear:342

Oem springs G35 coupes 2005 only with oem 19’s only 350Z 2004.5/2005
Front:314 Rear:427

Any spring or coil over that has “stiffer then oem springs by” does not factor in the higher rear spring rates of 2005 coupes with oem 19’s or 04.5+ oem 350Z’s

Eibach 350Z progressive springs 1”/1” drop* on 350Z G35 drops will be higher (*higher amounts common)
Spring rates in LBS initial/final front 296/384 initial/final rear 316/421
F +22% R +23% (looking at peak rates only)

Eibach G35 Coupe progressive springs 1.1”/1” drop on G35 coupe
Spring rates in LBS initial/final front 229/337 initial/final rear 274/463
F +7% R +35% (looking at peak rates only)

Eibach G35 Sedan 1.1”/1.1” drop on sedan
Spring rates in LBS initial/final front 259/334 initial/final rear 359/416
F +6% R +21% (looking at peak rates and in comparison to a sport suspended sedan)
F +18% R +34% (looking at peak rates only and in comparison to a non sport sedan)
Side Note: The sedan Eibachs were developed on a non sport sedan, they did not use a sport suspended car to do the R&D work.

Eibach 350Z sportline progressive springs 1.2"/1.2" drop, G35 drops will be higher
Front: 239/400 Rear: 257/435

Eibach G35 Sedan sportline progressive springs 1.6"/1.6" drop
Front: 171/400 Rear: 285-502

RSR 350Z linear springs .6”/.6” drop on 350Z G35 drops will be higher
Spring rates in LBS 345/417
Stiffer then oem by F+10% R+22% (see note at very top)
Transfers +12% roll stiffness to rear

RSR G35 coupe progressive springs 1”/1” G35 coupe drop
Spring rates in LBS 315/315
Stiffer or softer then oem springs by F+0 R-8% (see note at very top)
Transfers +8% roll stiffness to front

Hotchkis 350Z Linear springs .6”/.8” drop on 350Z G35 drops will be higher
Spring rates in lbs 340/330
Stiffer or softer then oem springs by F+8% R-3% (see note at very top)
Transfers +12% roll stiffness to front

Tein S-tech 350z (fronts are progressive, rears are linear) .7”/.6” drop on 350Z G35 drops will be higher
Spring rates in lbs 386/402 (final rates only, softer initial front progressive rate unknown)
Stiffer then oem by F+23% R+16% (see note at very top)
Transfers +7% roll stiffness to front

Tein H-tech 350z linear springs .3”/.2” drop on 350Z G35 drop will be higher
Spring rates in LBS 358/375
Stiffer then oem springs by F+14% R+11% (see note at very top)
Transfers +3% roll stiffness to front

Tein H-tech G35 coupe & sedan(fronts are progressive, rears are linear)
Spring rates in lbs 324/260 (final rates only, softer intial front progressive rate unknown)
Stiffer or softer then oem springs by F+ 5% R-22% (see note at very top)
Transfers +27% roll stiffness to front

Tein S-tech G35 coupe & sedan (fronts are progressive, rears are linear)
Spring rates in LBS 358/274 (final rates only, softer intial front progressive rate unknown)
Stiffer or softer then oem springs by R+14% R-18% (see note at very top)
Transfers +32% roll stiffness to front

Tanabe GF210 Series 350Z progressive springs 1”/1.2” drop on 350Z G35 drops will be higher
Spring rates in LBS 336/375 (only peak rates are published, softer initial progressive rates unknown)
Stiffer then oem springs by F+7% R+10% (see note at very top)
Transfers +3% roll stiffness to rear

Tanabe NF210 Series 350Z progressive springs 1.2”/1.2” drop on 350Z G35 drops will be higher
Spring rates in LBS 314/353
Stiffer then oem springs by F+0 R+3%
Transfers +3% roll stiffness to rear

Tanabe NF210 Springs G35 COUPE progressive springs 1”/,6” drop on G35 coupe G35 sedan drop will be higher
Spring rates in LBS 297/336
Softer then oem springs by F-5% R-2%
Transfers +3% roll stiffness to front

Tanabe DF210 G35 COUPE progressive springs 1.7”/1.3” drop on G35 coupe, G35 sedan drop will be higher
Spring rates in LBS 308/353
Stiffer or softer then oem springs by F-2% R+3% (see note at top)
Transfers +5% roll stiffness to front

Tanabe NF210 G35 SEDAN progressive springs 1.6”/.9” drop on G35 sedan
Spring rates in LBS 297/269
Softer then oem springs by F-5% R-21%
Transfers 17% roll stiffness to front

Tanabe DF210 G35 SEDAN progressive springs 1.7”/1.5” drop on G35 sedan
Spring rates in LBS 286/280
Softer then oem springs by F-9% R-18%
Transfers +9 roll stiffness to rear

Swift 350Z linear springs .8”/.6” drop on 350Z, G35 drop will be higher)
Spring rates in LBS 336/364

Swift G35 coupe linear springs 1”/.6” drop on G coupe, G35 sedan drop will be higher)
Spring rates in LBS 280/314 (softer then oem)

Nismo T2 350Z Linear springs 1”/1” drop on 350Z
DO NOT buy these springs!!!, insanely far too stiff for use with anything but revalved Koni shocks
Listed for information ONLY!
Spring rates in LBS 625/700

Vogtland 350z progressive springs 1”/1” drop on 350Z G35 drop will be higher
Spring rates in LBS initial/final front 257/354 initial/final rear 285/422

Kg/mm springs 350Z
DR21 super sport 15mm drop
Spring rates in lbs initial/final front 246/398 initial/final rear 252/409

Kg/mm springs 350Z
DRacing 30mm drop
Spring rates in LBS initial/final front 252/454 initial/final rear 252/482 rear

Espelir coupe springs (the U.S. importer recently changed specs, I do not believe the newly listed specs are correct, since the new one's are extremely high. And when I called the company to ask if the springs are linear or progressive, they told me Linear, turn's out they were absolutely wrong, they are in fact progressive. I show the old specs for those reasons, take it with a grain of salt, same thing for the 350Z fitment)
409/460F F+30% R+37%
Transfers +7% roll stiffness to rear

Espelir 350Z springs
381/460 F+22% R+37%
Transfers +15% roll stiffness to rear

Tein Flex (twin tube construction, adjustable dampners
Full-length adjustment and height adjustment for separate setting of the height and spring preload
Spring rates 672/672
Stiffer then oem by F+114% R+98
Transfers +16% roll stiffness to front
Side Note: Extremely high spring rates mean even when the adjustable damping is set as low as possible, you may not find ride quality happiness, several reports of this setups harshness exist Yet a few owner comment’s of a “like stock ride quality” also exist. However given the fact that they use a spring stiffness that’s over 100% stiffer then oem, if ride quality is of concern, either hitch a ride in a car equipped with them or make a different choice. In addition, several review’s have been done by people actually having the original more softly sprung Tein Flex coilovers do not take their comments to mean the same as the one using the current product, the original product specs are listed below under Tein Flex JDM.

Tein Flex JDM specs (can be special ordered est 10-12 weeks delivery)
Full-length adjustment and height adjustment for separate setting of the height and spring preload
Spring rates 560/560
Stiffer then oem by F+78% R+64%
Transfers 14% roll stiffness to front
Side Note: This is the original specs first offered in the U.S. with the Flex, shortly after it’s introduction the specs changed to those listed further above (672/672)

Tein Basic (twin tube construction, non adjustable dampners )
Spring rates 504/504
Stiffer then oem by F+61% R+43%
Transfers +18% roll stiffness to front
Side Note: Excellent value at it’s price point, drop's sedan's more then some of us care for.

Tein SS (twin tube construction, adjustable dampners )
(JDM only at this time. 10-12 weeks delivery, come via ship)
Spring rates 392/314-392 (rear’s are progressive)
Stiffer then oem by F+25% R+15% at peak

Tein CS (Monotube constructionad, adjustable dampners )
Special Note: A comfort ride system compare to HKS LS.They are valved and sprung to fulfill their intended mission of offering up improved ride comfort. More specifically their valving will impact the performance they can deliver. And to add, revalving them is extremely expensive if you find they are too soft for you. If you want performance, pick a different Tein offering or pick a different brand.
Spring rates 392/392
Stiffer then oem by F+25% R15%
Transfers +10% roll stiffness to front

Nismo S-tune (twin tube construction, uses progressive springs, especially in rear)
350Z/G35 Coupe
Spring rates 448/504
Stiffer then oem by F+43% R+48%
Transfers +5% roll stiffness to rear

Nismo S-tune (twin tube construction, uses progressive springs, )
G35 Sedan
Spring rates 347/342
Stiffer then oem by F+10% R+0%
Transfers 10% roll stiffness to front

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post #2 of 5 Old 03-28-2006, 11:50 PM Thread Starter
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more... pg2

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Jic Flta-2 350Z fitment (Monotube construction, adjustable dampning)
Full-length adjustment and height adjustment for separate setting of the height and spring preload
Special Note: This setup is known for it’s extremely harsh steet ride quality, buyer beware get a ride and drive in a Z33 spec setup before you buy.
Spring rates560/672
Stiffer then oem by F+78% R+98%
Transfers +20% roll stiffness to rear
Note: We have seen this setup run with softer 504lbs rear springs , search post’s by FritzMan on my350z

Jic Flta-2 G35 coupe (Monotube, adjustable dampning)
Full-length adjustment and height adjustment for separate setting of the height and spring preload
Spring rates 560/560
Stiffer then oem by F+78% R+64% $1750
Transfers 14% roll stiffness to front

Jic Flta-2 G35 sedan (Monotube, adjustable dampning)
Full-length adjustment and height adjustment for separate setting of the height and spring preload
Spring rates 504/392
Stiffer then oem by F+61% R+15%
Transfers +46% roll stiffness to front

Cusco Zero 1&2 Full-length adjustment and height adjustment for separate setting of the height and spring preload
Zero 1 has non adjustable dampning
Zero 2 has adjustable dampning
Spring rates 560/392
Stiffer then oem by F+78% R+15%
Transfers +63% roll stiffness to front (
Side Note: Pillow ball version reported to transfer excess harshness to the car, advise to not buy them.

Bilstein PSS coil over (Monotube construction, non adjustable dampners)
Special Note: Mild spring rates, but Bilstein says the dampners are performance valved
Spring rates 370/240-420 (rear progressive)
Stiffer then oem by F +18% R +23% (at peak rear spring rate)
Transfers +5% roll stiffness to rear
Note: be used to offer a 1” sedan drop, cost effective at $1195 shipped vs. Tein Basic’s you get monotube construction and minimum sedan drop is higher in the front (1” pss vs. 1.6” Basic)

Bilstein PSS9 coilover (Monotube construction, adjustable dampners)
Special Note: Mild spring rates, but Bilstein says the dampners are performance valved
Spring rates 370/240-420 (rear progressive)
Stiffer then oem by F +18% R +23% (at peak rear spring rate)
Transfers +5% roll stiffness to rear
Note: Still not available to my knowledge

HKS LS+ G35 Coupe (Monotube construction, adjustable dampners)
Spring rates 504/448
Stiffer then oem by F+58% R+29% (rear springs are progressive)
transfers 29% roll stiffness to the front
Side Note: Has the unusual distiction of actually being valved stiffer then the same coilover made for the 350Z (though you can only see 350Z LS+’s in the JDM catalog).

HKS LS+ 350Z Monotube construction, adjustable dampners
Spring rates 448/448
Stiffer then oem by F +43% R +31%
transfers 12% roll stiffness to the front
Sidenote: Listed on HKS's Japan web site, but not on the US web site. These might actually be our RS coilover.

HKS LS G35 (Monotube construction, non adjustable dampners)
Spring rates 448/336
Stiffer then oem by F+43% R -1%
transfers 44% roll stiffness to the front
Special Note: A comfort ride system, compare to Tein CS coilover

HKS LS 350z (Monotube construction, non adjustable dampners)
Spring rates 448/448
Stiffer then oem by F +43% R +31%
transfers 12% roll stiffness to the front
Special Note: A comfort ride system, note higher rear spring rate vs. G35 application

HKS II (Monotube construction, adjustable dampners)
Spring rates 504/504
Spring rates F+61% R+47%
transfers 14% roll stiffness to the front
Special Note: sprung and valved to be HKS’s most aggressive product for the G35/350Z, it is a notch above the RS coil over on the track, compare to Tein Flex and Jic coilovers. May be very tuff to get, said to have been removed from the USDM HKS catalog and is now JDM only, or so I’ve heard.

HKS RS (Monotube construction, adjustable dampning)
Spring rates 448/448
Stiffer then oem by F+43% R+31%
Transfers 12% roll stiffness to the front
Special Note: “Marketed” as HKS’s track coil over with a good street ride.
$1600 when on sale Owner review's have a simular flavor as the Zeal coilover's below, they are very will liked.

Zeal function V6 coilover (Monotube construction, adjustable dampner) $2855
Full-length adjustment and height adjustment for separate setting of the height and spring preload
Spring rates 560/448
Stiffer then oem by F+78% R+31%
Transfers +47% roll stiffness to front
Note: Ok, yes they are expensive. But they are from a exceptional company with a exceptional reputation and posted owner reviews that match.
$2800

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more.... pg3

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KW coilovers Variant's 1,2&3
Monotube construction,
V1=non adjustable dampning,
V2=adjustable damping,
V3=separate adjustability for compression damping AND rebound damping and is the only product of it’s kind at this time.
Spring rates Front 485lbs to 525Lbs Rear: 240Lbs to 548Lbs (progressive springs)
Notes: High progressive rear spring rate spread can be fixed easily with Eibach ESS springs in place of the KW rear springs, cheap fix at only $100 for a pair.

D2 Racing/Ksport Coilovers
Monotube constrution full length height adjustment separate from preload rear springs on coilover bodies
Spring rates in LBS 840/*728
*Rear springs are NOT run in the oem location, they are mounted on the rear dampners, where they leverage 23% greater force then springs located in the omen location, this difference show’s up below, look how much stiffer then omen springs this setup is.
Stiffer then omen springs by F+268% R+350%
Side Note:
Quote:
Originally Posted by JDMZ33
We are the U.S D2 racing sport distributor. We'll be testing them on our red track. Will set the retail price once it is ready. We can take special order now. test price is set at $1289. Will ship by Air. 3-5 business days.

Quote:
Originally Posted by 350z-z33
We test fitted a set on our Z six month ago and they sucks!!! The ride was WAY TOO harsh...... this is why we did not carry D2 coil-over at this point, but I heard they may have new design for the rear where the spring and strut are separated just like the OEM ones.....

Kg/mm DNA coilovers (this setup uses 4 springs on the rear of the car)
(Monotube construction, full length height adjustment separate from preload, adjustable dampners)
Spring rates in LBS Front 748 Rear progressive 336 to 672 + 280 linear on dampner
Stiffer then oem springs by F+238% R+233% to 331%

Buddy Club Racing spec coilovers (this setup uses 4 springs on the rear of the car)
(Monotube construction, full length height adjustment separate from preload, adjustable dampners)
Spring rates in LBS Front 748 Rear progressive 336 to 672 + 280 linear on dampner
Stiffer then oem springs by F+238% R+233% to 331%
$1555

R-SR I-shock coilovers (JDM only, R-SR USA may or may not be able to get them ) ride height 0mm to -30 mm on 350Z looking at pics, looks like they have full length height adjustment separate from preload with 46mm piston’s pretty sure they are monotubes Uses titanium springs (Ti2000)
http://www.rs-r.co.jp/products/shock/sports.htm
http://www.rs-r.co.jp/products/shock/pdf/z.pdf
Spring rates in LBS 560/504lbs

Silk Road SPEC-RM/A8 coilovers monotube 8 way adjustable dampners, full length height adjustment separate from preload
Spring rates in LBS 560/448
http://www.silkroad-jp.com/section/a8.html
$1699

*T1R Type-E Suspension systems (Monotube construction non adjustable dampners)
Full-length adjustment and height adjustment for separate setting of the height and spring preload
Spring rates: 672 lbs/ 448 lbs
Stiffer then oem by F+114% R+31%
Transfers +83% roll stiffness to the front
Notes* Listing on AJR’s web site has been pulled, pics of this setup are shown installed on 350z-tech.com, may or may not be inproduction.

Swift super mach coilovers
Spec’s unknown 560/448lbs?
http://www.swiftsprings.com/index.as...on=Custom&ID=5

Unitech racing/Truechoice Koni coilovers Shortned and revalved Koni shocks converted into coilovers, extensive R&D by the PerformanceNissan racing team, Unitech
Phase 3 have adjustable shocks Phase 4 are DA independent for bump/rebound
Spring rates in LBS 500/425

Moton Club sport dampners (coilovers) Monotube w/remote gas reservoir’s which feature adjustable gas pressure (100 to350 PSI) and are adjustable for bump and rebound separately.
Spring rates: Because of how they can adjust this is the only setup that allow's the end user the ability to run 300lbs to 1000lbs spring rates without the need to revalve. Simply change the gas pressure charge and adjust the dampning to suit your chosen spring rates
@$3500 (does not include the cost of springs)
http://www.350zmotoring.com/forums/s...ad.php?t=24459


Shocks

Tokico D-spec twin tube 8 way double adjustable (bump and rebound) gas shocks 2 fitment's are sold DSP-7 for the G35 and DSP-9 for the 350Z.
The only difference between the DSP-7 and 9 is that the rear shocks on the DSP-9 350Z fitment feature's shocks that have shorter shaft's (1" IIRC) The 2 fitment's are both valved the same. These shocks can be set from softer then oem G35 shock to stiffer then the oem 350Z shock, your choice depending on how you set them.
$489

Koni Sport SA twin tube shocks Single adjustable for rebound. All Koni shop services are available, repair, rebuild, revalve, reconfigure to double adjustable ect. Front shocks have separate spring perches, allowing the possible use of Koni coil over parts (which is how the true choice unit’s become coilovers)
$580 (if you find the right thread on my350Z)

Bilstein H.D. monotube gas shocks non adjustable oem replacements, not suited for use with stiffer then oem springs. Like the Koni's Bilstien does offer shop services, including lower revalve rates ($65 per shock)
$620

JRZ monotube DA shocks
$3500 Speedware Motorsports 425-869-5680
http://www.theracersgroup.com/parts/...cks/shocks.htm
Non-remote resevoir DA shocks with independent adjustment for compression and rebound dampning. Front shocks have built in adjustable spring perches.
Large 22mm piston rod for direct response compression control
Large 46mm piston for direct response rebound control
Large non-preloaded deflective disc stack for traction and smooth damping control
Orifice rebound adjustment for exact fluid control
Unique compression valving system in fluid/gas reservoir
Large gas volume capable of accepting large fluid displacements without harshness
Unique orifice adjustment for precise compression damping tuning
Very responsive damping force adjustment system

TcKline Racing DA shocks $419 each
These shocks are a double adjustable version of regular Koni SA shocks custom made for Tckline by Koni. They seperate adjustability for compression and rebound dampning via to seperate adjustment systems. They have their own valving specs totally seperate from Koni SA valving. They have a second spring perch grove cut on the front shocks that is 1" lower vs the front Koni SA shock that has a second grove cut 1/2" higher. Can handle up to 800lbs spring rates. Just like Koni SA shocks, these are a low pressure twin tube design.
http://www.tcklineracing.com/nonbmw.htm

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thanks for all that info, im sure thats gonna help me out when its time to get coilovers for the G
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dholly is so cool when it comes to posting info, he's the one who posted all the info (which I printed) on how to reset the ECU! Cool guy!

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