I have a G35 coupe with Eibach Pro kit springs and Tokico blues. Also Kinetix front camber arms and Eibach rear camber kit.

I have had this setup for less than 2,000 miles and I really don't like it. I live in Michigan and the roads suck. Its too rough and it feels under-damped. When I hit big dips or humps in the road I feel like my head is going to hit the ceiling. the rear especially feels under damped.

The car is also a little lower than I would like. Driveways can be quite a challenge sometimes. I would like it to be about 1/2" higher. Don't get me wrong - it looks great with the stance, but at the end of the day if you don't like driving it whats the point?

So what are some other springs that I might like better? Tein H tech?

 

Swifts springs

 

Since you mentioned h-techs, I'll give you my feedback on them. I have them paired with Tokico D-specs and quite honestly, it rides the same as stock (comfort wise). I love this setup.

 

Correct me if i am wrong, but aren't the H Tech's way softer than stock in the rear? Are they progressive?

I searched this subject for a bit, and I have seen lots of different rates posted for the stock springs, so I don't really know what to believe.

 

Here's a list of aftermarket springs


Eibach 350Z Pro-Kit progressive springs 1”/1”
Spring rates in LBS initial/final front 296/384 initial/final rear 316/421

Eibach 350Z Sportline progressive springs 1.2"/1.2"
F: 239/400 R: 257/435

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

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 (estimated front intial rate is 327lbs)

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

Progress Technology progressive springs 1.0”/1.0”
Spring rates in LBS 425/385 (final rates only, softer intial front progressive rate unknown)

Tokico D-spec shock & spring package
350Z - DSK512 - 375f/375r - Linear Springs 1"/1.5"

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) IMO, I'd pick Eibach Pro-kit over this spring.

Tanabe NF210 Series 350Z progressive springs 1.2”/1.2” higher
Spring rates in LBS 314/353
Oem spring stiffness on a 1.2” drop, not a choice I would make

Skunk2 350Z progressive springs 1.3”/1”
Spring rate in LBS 238/381 237/395

Swift 350Z linear springs .8”/.6” drop on 350Z,
Spring rates in LBS 336/364

Swift 350Z Spec-R progressive springs 1.2”/1”
Spring rates in LBS intial/final Front: 291/392 Rear: 280/448

Vogtland 350z progressive springs 1”/1”
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 DRacing progressive springs 1.2”/1.2”
Spring rates in LBS initial/final front 252/454 initial/final rear 252/482 rear


Espelir 350Z progressive springs 10mm drop F&R
386/515 (softer initial progressive rates are unknown)
Most often purchased by owners chasing spring rate specs. But this spring is also often resold when they fail to deliver on the promise those specs were supposed to delivery. Not a bid surprise, they are progressive, not linear.

H&R sport progressive springs 350Z 1.3”/1” drop
Spring rates in LBS 370/400 (peak rates only, softer initial rates are unknown)
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Old 05-21-2011, 10:12 AM #4

 

I don't think it's the springs as far as the ride..I've heard the Tokico Blues are harsh and not damped well. If you want higher, then of course you'll have to go with the springs that drop less..you saw the list on this thread. As far as shocks..the D specs set on softer settings are the way to go.
Personally, I just picked up a set of Nismo S Tune shocks and springs..they only drop you around 1/2-3/4" and is an awsome set up. Yes...expensive, but I got em slightly used at half price.

 

Looks like he drives a G Huyrua, those specs may differ.

 

I think G35 coupe is same as Z

 

Nope... they are not.

 

 

Yes, the Eibach Pro-Kit G35 coupe application is it's own spring and it's totally different then the Eibach Pro-Kit 350Z application.

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

Eibach 350Z progressive springs 1”/1” drop* on 350Z G35 drops will be higher
Spring rates in LBS initial/final front 296/384 initial/final rear 316/421


Based on what you want I would pull the Eibach springs and go with the Tein 350Z H-tech's. Because you have a G coupe you'll get a .8"/.7" drop

Tein H-tech 350z linear springs .3”/.2” drop on 350Z
Same spring when installed on G35 coupe .8"/.7" drop
Spring rates in LBS 358/375

Curious, what settings are you running your D-specs on right now? And what are your thoughts about what happened when you tried turning them up or down?

 

Tein G35 H-tech and S-tech are way softer then oem. They are progressive in the front, but not in the rear. (350Z Tein H-tech springs are linear front and rear btw)

Cut and dry this is the bottom line fact reguarding G35 coupe oem spring rates

2003-2007 G35 coupe delivered on oem 17 or 18 inch wheels
314/342 ("sport tuned")

2005-2007 G35 coupe delivered on oem 19 inch wheels (sport suspension)
314/427


http://g35driver.com/forums/brakes-s...w-updates.html

 

I have Tokico blues, not D-specs, so there is no adjustment. I am thinking that they are OK with the initial rates of the Eibach springs, but once the Eibachs get into some significant compression they feel under damped. Small bumps and cracks aren't bad, but when I hit bigger bumps I feel like it is trying to throw me out of my seat.

Thanks for all of the input guys. The 350Z H-techs seem like a good one to try next.

Other opinions are welcome!

 

Why the huge rate increase in the rear in 05? Was this in response to complaints of understeer? Didn't Nissan do something similar on the Z in 05? I assume they would have increased the damping in the rear to accommodate the change in spring rate...

 

Does a spring rate translate into the stiffness of the ride?
IE: (per above) Hotchkis spring rates are 340/330 and Tein s-techs are 386/402. Does that mean Hotchkis will give a softer ride? (given both springs are installed on oem shocks).

Edit: I did some research and saw that the oem rates are 314/427 for 2004.5 and up. Can anyone confirm this info?

 

i just installed the pro kits on my 05 and i believe that the spring rates for the pro kit is actually lower then the OEM springs under normal load and under heavy load it's basically the same as OEM. I'm running stock shocks and realistically speaking if someone had secretly replaced my OEMs with the Pro kit in the middle of the night and i just got in the car the next morning and drove to work....i wouldn't be able to tell they were swapped out

and i'm actually thinking the car is maybe 1/2" too high still, the front has about a 1 finger gap and the rear has about a 1.5 finger gap.

 

generally yes, but the teins are progressive which means they start softer but become more firm as you compress them.