blkg

Does anybody know if the HKS Hipermax II coilovers for the 350z fit on the G35 coupe. Any fitment issues, etc.?

Gsedan35

iTrader: (10)

Flat out, their is no such thing as a suspension part made for the 350Z that does not fit or work on a RWD G35.(the one big exception is the 350Z's front strut tower bar). They are both the same platform and platform engineering is your friend.

blkg

Why don't they advertise it for the G35 then? I called HKS and they would not admit that it would work. Something about different valving or setup.

sentry65

iTrader: (11)

yeah I wouldn't automatically say all their parts are interchangable even if they share the same platform

Gruppe-S

iTrader: (66)

The 350z susp is interchangable with the G35 coupe. Only diff is the preset factory height on both the cars.

Tom

Gsedan35

iTrader: (10)

Your dealing with a several things. Many companies view the G35 driver as less demanding then the 350Z driver, basically your painted as someone that doesn't want the same performance as 350Z owners want. So, they don't even bother installing their more performance oriented offerings on the G35 in many cases. Sometimes they toss you a curve ball, HKS is that company. HKS LS+ valving spec's for the G35 coupe is more aggressive then the HKS LS+ valving specs for the 350Z. If you look at the valving specs for the HKS II's for the 350Z, the specs are up their past the LS+ G35 specs. Unfotunately, some companies learn their tech's that answer the phone in CYA vs common logic thought processes that a informed consumer can figure out for themselves. Tein coilovers, use the same specs across all coilover offerings for the 350Z, G35 coupe and G35 sedan, spring rates are the same as are the valving specs. Zeal coilovers for the 350Z and G35 coupe both use the same spring rates, though because they differ in model number on the endless website, I'll bet money that something is different valving wise.

All listed spring rate percentages vs oem rates listed below are in comparision to pre 2004.5 350Z's, G35 coupes without oem 19's and all G35 sedan's with the sport suspension.

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 6-8 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

Tein SS (twin tube construction, adjustable dampners )
(JDM only at this time. 6-8 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 fullfill 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 extreamly 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

Buddy Club Racing Spec coilovers (Monotube construction, adjustable dampning)
Full-length adjustment and height adjustment for separate setting of the height and spring preload
748/336 to 672 + 280 on dampner
This setup runs 336~672 progressive rate spring at the stock spring location and a 280lbs linear spring on the rear dampner body. Since those differing rear spring locations leverage differing forces to the wheel, here is a look at the setups wheel rates as a percentage of stiffness over oem wheel rates.
Stiffer then oem by F:+238% R: +233% to 331%


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 street ride harshness, but also for track performance
Spring rates560/672
Stiffer then oem by F+78% R+98%
Transfers +20% roll stiffness to rear

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 (Monotube Zero1=non adjustable dampner, Zero2=adjustable dampner)
Full-length adjustment and height adjustment for separate setting of the height and spring preload
Spring rates 560/392
Stiffer then oem by F+78% R+15%
Transfers +63% roll stiffness to front (no they do not run their rear springs on the dampner body, oem location, seen them on the car with my own eyes.)



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

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




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 the Z version does NOT transfer as much roll stiffness to the front

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.

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, spring rates make better sense then same G35 application, compare to Tein CS

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, it is a notch above the RS coil over on the track, compare to Tein Flex and Jic coilovers

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.

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

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)

D2 Racing Coilovers (Monotube)
840/728 (wee bit stiff eh, the recommended rate to)



Kg/mm DNA coilovers (Monotube construction, adjustable dampners)
840/280*+
See the Buddy Club specs on spring rates and stiffness to oem specs

T1R Type-E Suspension systems (Monotube construction)
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

Truechoice Phase III & IV DA Coil-overs
500/425

Gsedan35

iTrader: (10)

I guess I wasn't clear, sorry about that. It is fact. The G35 lacks the 350Z's special welded on STB mounting tab's and the G35 has some things in the way that prevent the use of 350Z STB's on the front of the G35. G35 sedan's cannot use the 350Z's or G35 coupe's rear pin stay brace because the sedan's spare tire wheel well prevent's it's use. Other then those things, All suspension hard mounting points are the same. And all suspension arms, links and sway bar mount's are all the same. Those sway bars also have the exact same bending and contour's and in model year 2003 were the same parts across the entire model range Z to G sway bar wise.

To further the discussion here's more data.

2003 to 2004.5 350Z oem spring rates
314/342

2003 to 2005 G35 coupes with oem 17's or 18's oem spring rates
314/342

2004.5 to 2005 350Z oem spring rates
314/427

2005 coupe's with oem 19's (sport suspenison)
314/427

350Z roadsteer spring rates
314/427

G35 sedan with sport suspension
314/427


Ride height's

G35 coupe's are 1/2" higher then the 350Z

G35 sedan's are 1" higher then the 350Z