Looking to replace my OEM suspensions both front and rear for a 04 G35 coupe...I live in NYC where the streets arent the greatest so Im looking for something thats gonna give me a smoother ride but still keep that low look. So far Ive looked at the HKS Hipermax 111...Any other suggestions???

 

Personally, REDBOY8, I went with Tein 350Z H-Techs after doing great deal of research on:

1. Spring rates - didn't want 'em too stiff, which almost compells you to change shocks/struts simultaneously.......or at least sooner

I have sport suspension package with stiffer rear springs, shocks & thicker roll bar. But I still plan on upgrading to Tokico HP Blues (same as Tokico D-specs, minus adjustability)

2. No desire to lower it to a point where it requires a camber kit (none needed for .8 or less drops.)

3. All of the above, while still wanting a tasteful, yet enhanced ride/handling. No additional body roll noticed, though I heard I might get some; still very quick & shift in transitions/switchbacks.

After waiting almost 4 years to change the springs, I feel nothing out of the ordinary, in fact, the lower center of gravity may've nullified whatever I should be feeling......allegedly.

But if I'm not noticing it, and it is happening (I trust my judgement), the Tokicos will fix that.

In any case, some of the data I looked at is below, along with before & after pics.

And if you want more, let me know so you can do your own comparisons. For the most bpart I eventually narrowed down my choices to Tanabes or Teins - about several variations, I think (Tein S-techs or H-techs, Tanabe GF210s, NF210s or DF210s, for G's or 350z's)

Gsedan35
10-17-2005, 01:54 PM
The sport suspension on the G35 coupe which is only on 2005 coupe's delivered with OEM 19's, is as follow's.

Same ride height as regular coupe suspension (as measured on the lot, regular coupes vs coupes with the 2005 sport suspension)

Same spring rates in front (314lbs)

24% rear spring rate increase (342lbs to 427lbs)

Stiffer shocks

Infiniti tells us the sway bars are stiffer, though we don't know exactly what was done.

I have reason to believe that the front bar is different via thicker hollow walls, likely featuring about 20% greater stiffness. I do not believe that the suspension has a rear bar that is any different than the regular coupe’s suspension.

All coupe production, REGARDLESS of build year delivered with OEM 17's or 18's has the regular coupe suspension.

People get confused and think they too have a sport suspension.

Reality is any coupe that did not come with OEM 19's, has a "sport tuned" suspension meaning the regular coupe suspension.

When making lowering spring choices for the coupe, be very mindful that most aftermarket offerings are not geared towards maintaining performance, they are a compromise to lower the car and work as best as possible with the regular coupe shocks.

If you don't want that compromise, some 350Z based springs are a vastly superior choice.

**************

dholly
Over 2,500 Posts
Join Date: May 2003
Location: Upstate NY
Posts: 3,841

The H tech use spring rates that are softer than OEM and transfer a large amount of roll stiffness to the front, meaning they will increase understeer.

Tein H-tech for G35 Sedan (SKP14-BUB00)
F/R Progressive - spring rates listed rates are final rates
324/263
F drop –1.4”
R drop –0.7”
Tein H-tech for G35 Sedan front to rear spring rate balance vs. OEM balance
-7% front / -35% rear (28% transfer to front)

Here is a bunch of spring rate, sway bar, coilover etc. info I copied a while back from a post by Gsedan35 worthy of reposting:

Quote:
Stock Coupe 6MT Spring rates are the same rate as the 350Z spring and the sedan with the sport suspension.

314/342……..Rear – 427 with Sport-Tuned Suspension Package. -

Here are the spring rates in comparision to all known lowering spring/coilover product made for the Z33/CPV35/V35. If a product is not listed, that maker refused to give out the info.

Eibach's as noted (first number is the softer initial rate, followed by the higher final rate)
350Z 296/384 front 316/421 rear
G35c 229/337 front 274/463 rear
G35s 259/334 front 359/413 rear

RSR 350Z springs (just a wee bit progressive F&R, maybe one coil is progressive)
345/417 F+10% R+22%
Transfers +12% roll stiffness to rear

RSR G35 coupe springs (progressive front and rear)
315/315 F+0 R-8%
Transfers +8% roll stiffness to front

Hotchkis 350Z springs (linear springs)
340/330 F+8% R-3%
Transfers +12% roll stiffness to front

Tein S-tech 350z (fronts are progressive, rears are linear)
386/402 F+23% R+16%
Transfers +7% roll stiffness to front

Tein H-tech 350z (fronts are progressive, rears are linear)
358/375 F+14% R+11%
Transfers +3% roll stiffness to front

Tein H-tech G35 coupe & sedan(fronts are progressive, rears are linear)
324/260 F+ 5% R-22%
Transfers +27% roll stiffness to front

Tein S-tech G35 coupe & sedan (fronts are progressive, rears are linear)
358/274 R+14% R-18%
Transfers +32% roll stiffness to front

Tanabe GF210 Series 350Z
336/375 F+7% R+10%
Transfers +3% roll stiffness to rear

Tanabe NF210 Series 350Z
314/353 F+0 R+3%
Transfers +3% roll stiffness to rear

Tanabe NF210 Springs G35 COUPE
297/336 F-5% R-2%
Transfers +3% roll stiffness to front

Tanabe DF210 Springs G35 COUPE
308/353 F-2% R+3%
Transfers +5% roll stiffness to front

Tanabe NF210 Springs G35 SEDAN
297/269 F-5% R-21%
Transfers 17% roll stiffness to front

Tanabe DF210 Springs G35 SEDAN
286/280 F-9% R-18%
Transfers +9 roll stiffness to rear

Kg/mm springs 350Z
DR21 super sport 15mm drop
246/398 front 252/409 rear

Kg/mm springs 350Z
DRacing 30mm drop
252/454 front 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 extreamly 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 absolutley 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
672/672 F+114% R+98
Transfers +16% roll stiffness to front

Tein Flex JDM specs (can be special ordered est 6-8 weeks delivery)
560/560 F+78% R+64%
Transfers 14% roll stiffness to front

Tein Basic
504/504 F+61% R+43%
Transfers +18% roll stiffness to front

Tein CS (Monotube)
392/392 F+25% R15%
Transfers +10% roll stiffness to front

Nismo S-tune (uses progressive springs, especially in rear)
350Z/G35 Coupe
448/504 F+43% R+48%
Transfers +5% roll stiffness to rear

Nismo S-tune (uses progressive springs)
G35 Sedan
347/342 F+10% R+0%
Transfers 10% roll stiffness to front

Buddy Club Racing Spec coilover (Monotube)
748/280*
(very likely run's rear springs on the dampner body and not at the oem rear spring location)

Jic Flta-2 350Z fitment (Monotube)
560/672 F+78% R+98%
Transfers +20% roll stiffness to rear

Jic Flta-2 G35 coupe (Monotube)
560/560 F+78% R+64% $1750
Transfers 14% roll stiffness to front

Jic Flta-2 G35 sedan (Monotube)
504/392 F+61% R+15%
Transfers +46% roll stiffness to front

Cusco Zero 1&2
560/392 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.)

HKS LS+ (rear springs are progressive)
496/440 +58%front +29%rear
transfers 29% roll stiffness to the front

HKS LS G35
448/336 43%front -1%
transfers 44% roll stiffness to the front

HKS LS 350z
448/448 43%front +31%
transfers 12% roll stiffness to the front

HKS II 504/504 +61%front +47%rear $1600
transfers 14% roll stiffness to the front

KW coilovers Variant's 1,2&3
Variant 3's are noteworthy as the only known coilover for these cars where the dampners are adjustable for compression and rebound independently. They also differ in using progressive springs front and rear
Front: 485lbs to 525Lbs Rear: 240Lbs to 548Lbs

D2 Racing Coilovers (Monotube)
840/728 F+168% R+113% (wee bit stiff eh, the recommended rate to)
Transfers 55% roll stiffness to front