serious info on springs and coils for g35 or 350z

[slipstream_pnoy]

found this from another site, thought i might share.

This is a list that is ment to help anyone make a more informed choice. It is here to help the community on the whole.

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 spring rates

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

Oem springs G35 coupes 2005/2007 with oem 19’s only 350Z 2004.5 to 2007Front: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”Spring rates in LBS initial/final front 296/384 initial/final rear 316/421If you use these springs on a G35 your drop amount will be higher, since oem G35 shocks are longer then oem 350Z shocks, keeping your oem shocks would not be a good idea.

Eibach G35 Coupe progressive springs 1.1”/1”Spring rates in LBS initial/final front 229/337 initial/final rear 274/463

Eibach G35 Sedan 1.1”/1.1”Spring rates in LBS initial/final front 259/334 initial/final rear 359/416The sedan Pro-Kits 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"F: 239/400 R: 257/435

Eibach G35 Sedan sportline progressive springs 1.6"/1.6" dropF: 171/400 R: 285-502

RSR 350Z linear springs .6”/.6”Spring rates in LBS 345/417

RSR G35 coupe progressive springs 1”/1”Spring rates in LBS 315/315

Hotchkis 350Z Linear springs .6”/.8”Spring rates in lbs 340/330

Tein S-tech 350Z springs .7“.6“ (fronts are slightly progressive, rears are linear)Spring rates in LBS 386/402

Tein H-tech 350z linear springs .3”/.2”Spring rates in LBS 358/375

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)

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)

Progress Technology progressive springs 1.0”/1.0”Spring rates in LBS 425/385 (final rates only, softer intial front progressive rate unknown)http://www.progressauto.com/20...d.pdfIf you use these springs on a G35 your drop amount will be higher, since oem G35 shocks are longer then oem 350Z shocks, keeping your oem shocks would not be a good idea.

Tokico D-spec shock & spring packageG35 - DSK507 - 240f/300r - Linear Springs350Z - DSK512 - 375f/375r - Linear Springs 1"/1"

Tanabe GF210 Series 350Z progressive springs 1”/1.2”Spring rates in LBS 336/375 (only peak rates are published, softer initial progressive rates unknown)If you use these springs on a G35 your drop amount will be higher, since oem G35 shocks are longer then oem 350Z shocks, keeping your oem shocks would not be a good idea.

Tanabe NF210 Series 350Z progressive springs 1.2”/1.2” higherSpring rates in LBS 314/353If you use these springs on a G35 your drop amount will be higher, since oem G35 shocks are longer then oem 350Z shocks, keeping your oem shocks would not be a good idea.

Tanabe NF210 Springs G35 COUPE progressive springs 1”/,6”sedan drop will be higherSpring rates in LBS 297/336

Tanabe DF210 G35 COUPE progressive springs 1.7”/1.3”Spring rates in LBS 308/353

Tanabe NF210 G35 SEDAN progressive springs 1.6”/.9” drop on G35 sedanSpring rates in LBS 297/269Softer then oem springs by F-5% R-21%

Tanabe DF210 G35 SEDAN progressive springs 1.7”/1.5” drop on G35 sedanSpring rates in LBS 286/280Softer then oem springs by F-9% R-18%

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”Spring rates in LBS 625/700Do NOT run them with OEM shocks or Tokico D-specs. Use Koni sports or TcKline. Drop amount on a G35 will be higher.

Vogtland 350z progressive springs 1”/1”Spring rates in LBS initial/final front 257/354 initial/final rear 285/422If you use these springs on a G35 your drop amount will be higher, since oem G35 shocks are longer then oem 350Z shocks, keeping your oem shocks would not be a good idea.Kg/mm springs 350Z

DR21 super sport 15mm dropSpring rates in lbs initial/final front 246/398 initial/final rear 252/409

Kg/mm DRacing progressive springs 1.2”/1.2”Spring rates in LBS initial/final front 252/454 initial/final rear 252/482 rearIf you use these springs on a G35 your drop amount will be higher, since oem G35 shocks are longer then oem 350Z shocks, keeping your oem shocks would not be a good idea.

Whiteline 350Z linear springs (control)Front: Part # 73219,Spring rate 365 LBS Drop: .8"-1" (will be higher on a G35)Rear: Part # 73220Spring rate 445LBS Drop: 1"-1.2" (will be higher on a G35)(sold as 2 front springs and 2 rear springs)http://www.whiteline.com.au/store/

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)

Espelir G35 coupe progressive springs 10mm drop F&R409/460F F+30% R+37%New specs Macklin now shows as follows409/515 F+30% R+50%[url]http://www.mackinindustries.com/md/espe ... springs.pd[/url

Espelir 350Z progressive springs 10mm drop F&R381/460 F+22% R+37%New specs Macklin now shows as follows386/515 F+22% R+50%

H&R sport springs G35 coupe (progressive springs)1.1"/1" dropno spring rate info H&R refuses to give it out, something that is critical to making a informed buying decision, buyer beware)

H&R sport springs G35 sedan (progressive springs)1.3"/1.2"no spring rate info H&R refuses to give it out, something that is critical to making a informed buying decision, buyer beware

H&R sport springs 350Z (progressive springs* {I'd to see a picture of the springs themselves)1.3"/1" drop on 350Z, G35 drops will be higherno spring rate info H&R refuses to give it out, something that is critical to making a informed buying decision, buyer bewareIf you use these springs on a G35 your drop amount will be higher, since oem G35 shocks are longer then oem 350Z shocks, keeping your oem shocks would not be a good idea.Gsedan35 is offline Reply With QuoteGsedan35View Public ProfileFind More Posts by Gsedan35Old 05-05-2007, 12:13 AM #2Gsedan35Registered User Join Date: Dec 2003Location: Cerntral CalPosts: 40Rep Power: 0 Gsedan35 is chirping forth Gsedan35 is chirping forth Gsedan35 is chirping forth Gsedan35 is chirping forth Gsedan35 is chirping forth Tein Mono Flex (mono tube construction, adjustable dampners)Full-length adjustment allowing for ride height adjustment separate from spring preload.Spring Rates 784/784Side Note: Extremely high spring rates that not everyone will be able to run successfully, some will find that they cannot maintain tire contact on less them smooth pavement, and unless the valving the question of maintaining civility should come to mind. Setup does use Teins MSV valving http://www.tein.com/msve.html

Tein Flex (twin tube construction, adjustable dampnersFull-length adjustment and height adjustment for separate setting of the height and spring preloadSpring rates 672/672Side 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 preloadSpring rates 560/560side 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 504/504Side Note: Excellent value at it’s price point, drop's sedan's more then some of us care for.

Tein SS JDM (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*UPDATE*^ spring rate specs have been changed350Z 280/394G35 coupe 392/392G35 sedan (listed as skyline pv35) 392/39212/4/06 updateAll 3 car's now show the same 392/392 rates and the same part# GSP24-B1AS3 Question is, did any 280/392 Z33 setups ever get manufactured?

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 392/392Stiffer then oem by F+25% R15%

Tanabe Sustec Pro S-OC Type IITwin tube non adjustable dampningSpring rates 560/448

Sustec Pro S-OCSame product as above with the addition of helper springs“Helper springs assist with rebound stability, ride comfort and keep the main coil spring seated. Preload of the main spring can also be set to zero, for maximum comfort and suspension travel.” Helper springs, generally add in a progressive nature to the spring they are helping.

Sustec Pro SEVENTwin tube dampners, adjustable dampning, full height adjustment system that allows changes in vehicle ride height without effecting spring preload. “The new slide valve technology allows a great range of adjustability and function from both sides of the performance spectrum. (comfort to pure competitive motorsports use)”Spring rates 560/560 or 672/672, one or both of the kits uses progressive rear springs.

When used with the new TEAS electronic active suspension controller, the wide range of dampening force is accessible through the touch of a button, and is fully programmable to automatically adjust dampening rates according to the speed you drive.

Nismo S-tune (twin tube construction, uses progressive springs)350Z .8"/.8" dropSpring rates 448/504Stiffer then oem by F+43% R+48%

Nismo S-tuneG35 Coupe .8"/.8"448/504

Nismo S-tune (twin tube construction, uses progressive springs, )G35 Sedan 1"/1" dropSpring rates 347/342Stiffer then oem by F+10% R+0%

Jic Flta-2 350Z Z33FLTA2H(Monotube construction, adjustable dampning)Full-length adjustment and height adjustment for separate setting of the height and spring preloadSpecial 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 rates560/672Stiffer then oem by F+78% R+98%Transfers +20% roll stiffness to rearNote: We have seen this setup run with softer 504lbs rear springs , search post’s by FritzMan on my350z

Jic Flta-2 350Z Z33FLTA2S****same as above but with softer progressive rear springs.560/560.

Jic Flta-2 G35 coupe CPV35FLTA2(Monotube, adjustable dampning)Full-length adjustment and height adjustment for separate setting of the height and spring preloadSpring rates 560/560Spec change!I have no idea when this happened, but the Jic-Magic web site now show's the spring rates as 560/448

Jic Flta-2 G35 sedan (Monotube, adjustable dampning)As of 1/06/07, this coilover is no longer listed on Jic's web siteFull-length adjustment and height adjustment for separate setting of the height and spring preloadSpring rates 504/392Stiffer then oem by F+61% R+15%

FLT-A2-VIP SeriesThe new FLT-A2 VIP are made for the enthusiast that wants that extreme dropped look and high quality ride comfort. Shares many performance features as the FLT-A2's but made specifically for high end luxury vehicles.G35 SedanSpring rates 504/336(not really feeling the softer then oem rear rates, IMO would change to 392 or 448)

JIC FLT-A1 is a coilover suspension set up ideal for the enthusiast that will use the suspension on a daily basis and occasionally for the track. FLT-A1 features a 10 way adjustable damper. Street price $1375350Z, Twin tube construction, 10 way adjustable, full height adjustableSpring rates 560/560 Z33FLTA1**** (rear springs are progressive)

G35 Coupe, Twin tube construction, 10 way adjustable, full height adjustableSpring rates 560/448

G35 Sedan, Twin tube construction, 10 way adjustable, full height adjustableSpring rates 504/336(not really feeling the softer them oem rear rates, IMO would change to 392 or 448)

Cusco Zero 1&2 Full-length adjustment and height adjustment for separate setting of the height and spring preloadZero 1 has non adjustable dampningZero 2 has adjustable dampningSpring rates 560/392Stiffer then oem by F+78% R+15%

Bilstein PSS coil over (Monotube construction, non adjustable dampners)Special Note: Mild spring rates, but Bilstein says the dampners are performance valvedSpring rates 370/240-420 (rear progressive)Stiffer then oem by F +18% R +23% (at peak rear spring rate)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 valvedSpring rates 370/240-420 (rear progressive)Stiffer then oem by F +18% R +23% (at peak rear spring rate)

HKS LS+ G35 Coupe (Monotube construction, adjustable dampners)Spring rates 504/448 (rear springs are progressive)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 dampnersSpring rates 448/448Sidenote: 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 448/336Special Note: A comfort ride system, compare to Tein CS coilover

HKS LS 350z (Monotube construction, non adjustable dampners)Spring rates 448/448Special Note: A comfort ride system, note higher rear spring rate vs. G35 application

HKS II (Monotube construction, adjustable dampners)Spring rates 504/504Special 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 448/448Special 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.

Stance coilovers (Monotube, true coilover in rear, 15 way adjustable dampning, full height adjustableSpring rates 672/280**since rear springs are run on coilover body, they leverage 100% of the springs power to the rear wheel vs. 36% when the rear springs are run in the oem location. So to get the same rear spring power as if you were running the springs in the oem rear location you would have to run a 780lbs rear springs.CAUTION: Really good owner review's exist and at $1150 shipped they are a excellent value. But a number of owner's are experiencing issues with the lower shock mount bushing not being designed to carry the loads being asked of it since the oem setup was not designed to have the springs with the shocks. A new sperical bushing fix has been talked about, but hasn't been produced yet.

Zeal function V6 coilover (Monotube construction, adjustable dampner) $2855Spring rates 560/448Stiffer then oem by F+78% R+31%Note: Ok, yes they are expensive. But they are from a exceptional company with a exceptional reputation and posted owner reviews that match.$2800

Zeal Function XSMonotube dampenrs, adjustable dampning, full lenghth adjustable allowing for ride height adjustability without effecting spring preload.Spring rates 560/448 or 672/560

Ohlins PCV coiloversMonotube, inverted rears, adjustable dampning, full length height adjustable allowing ride height changes without effecting spring preload.Spring rates 560/392

KW coilovers Variant's 1,2&3twintube construction,V1=non adjustable dampning,V2=adjustable rebound damping,V3=separate adjustability for compression damping AND rebound damping .Spring rates Front 485lbs to 525Lbs Rear: 240Lbs to 548Lbs (progressive springs)Notes: High progressive rear spring rate spread that cannot be easily fixed because of the mounting diameters of the upper and lower spring seats in the height adjusting system. It still can be fixed, but would require a lot of phone calls and research that most won’t bother with, IMO it’s worth the bother.

Eibach Pro street S coiloversDrop range on 350Z 0.8 to 1.6" front same for the rear.As per Eibach they are relabled KW variant 1 coilovers, springs are a different color simply because Eibach has them refinished red vs yellow.Gsedan35 is offline Reply With QuoteGsedan35View Public ProfileFind More Posts by Gsedan35Old 05-05-2007, 12:13 AM #3Gsedan35Registered User Join Date: Dec 2003Location: Cerntral CalPosts: 40Rep Power: 0 Gsedan35 is chirping forth Gsedan35 is chirping forth Gsedan35 is chirping forth Gsedan35 is chirping forth Gsedan35 is chirping forth Greddy Type S coiloversMonotube, 32 way adjustable, full height adjustment350Z and G35 coupe fitments have different part numbers and different spring free lengthsSpring rates 560/448Note: Likely OEM supplied by Bc Racing

Megan Racing coiloversMonotube, 32 way adjustable, full height adjustmentSpring rates 560/448Note: Underdampned, highly recommend that 560lbs front rate NOT be used and that you invest $100 on 448lbs front springs in their place. Run them towards full stiff on dampning settings.

D2 Racing/Ksport CoiloversMonotube constrution full length height adjustment separate from preload rear springs on coilover bodiesSpring rates in LBS 840/*728*Rear springs are NOT run in the oem location, they are mounted on the rear dampners, where they leverage 100% of their force to the wheel, vs. just 36% for a spring run in the oem rear location. Spring rates will not be a sensible choice for most and should be questioned very VERY hard.

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

Buddy Club Racing spec coilovers (rear springs on dampners ONLY)(Monotube construction, full length height adjustment separate from preload, adjustable dampners)Spring rates in LBS Front 560 Rear 448Note: Another system that runs it’s rear springs on the rear dampners. Meaning they leverage 100% of their rear spring rate directly to the rear wheels, vs. just 36% with a spring run in the oem rear location. Knowing that, do you have too much rear spring?

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/sp ... .pdfSpring rates in LBS 560/504lbs

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

*T1R Type-E Suspension systems (Monotube construction non adjustable dampners)Full-length adjustment and height adjustment for separate setting of the height and spring preloadSpring rates: 672 lbs/ 448 lbsTransfers +83% roll stiffness to the frontNotes* 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 coiloversSpec’s unknown 560/448lbs?Note: Development suspended with outside supplier, currently working on R&D to make inhouse.

Unitech racing/Truechoice Koni coilovers Shortned and revalved Koni shocks converted into coilovers, extensive R&D by the PerformanceNissan racing team, UnitechPhase 3 have adjustable shocks Phase 4 are DA independent for bump/reboundSpring 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/fo...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)

JRZ monotube DA shocks$3500 Speedware Motorsports 425-869-5680http://www.theracersgroup.com/...s.htmNon-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 controlLarge 46mm piston for direct response rebound controlLarge non-preloaded deflective disc stack for traction and smooth damping controlOrifice rebound adjustment for exact fluid controlUnique compression valving system in fluid/gas reservoirLarge gas volume capable of accepting large fluid displacements without harshnessUnique orifice adjustment for precise compression damping tuningVery responsive damping force adjustment system

TcKline Racing DA shocks $419 eachThese 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

[duhafnusa4]

nice

[alkemyst]

Great post, the Tein EnduraPlus and EnduraPlus Pro adjustable struts and shocks should be added. Pretty nice units for the price. My son is running them with the Hotchkis TVS kit.