Currently i am running the eibach prokit springs and the stock sport struts on my Sedan. Honestly I never really liked the progressive ride but I did it to please the wifey. Now that she's sportin a Gx470 the G35 is all mine.

I would like to go with a linear rate spring. I have read many posts about Teins, unrevised 350Z and revised 350Z springs. Whats the best spring to go with. I don't want a Slammed look.

Also who's got the best deal on Tokico D specs?

 

Something tell's me that in the end you'll come to realize the the aftermarket has left you and me high and dry. No linear springs with a real increase in spring rates that are not more then a 1" drop. Everything is geared towards the Z and your choices will drop you between 1.4" and 2". As you go past 1" the issue of not enough shock stroke, EVEN on shorter 350Z based shocks becomes a clear issue. I had Koni's with Tokico D-spec springs, which offer the highest linear spring rates you can get short of Nismo T2 springs and I kept on having issues with shock piston stroke in the front. I even went so far as to use the Koni's ability to raise the spring perch in the front 1/4" and raise the rear with a spacer above the upper spring seat, made very little differance, I was still kissing the front bump stops. And I was running special bump stops that were FAR shorter then any oem cut down bump stop.

IMO, you stand a better chance with coilovers. Unless you were willing to try D-spec shocks with Tom Motorsport sleave coilovers, though going to 500/500 spring rates may be more of a increase then your prepaired to do. Having been on higher rates for awhile myself, I will never step below 448lbs in the front, currently on 560lbs.


What your not happy with,
Eibach G35 Sedan 1.1”/1.1” drop on sedan
Spring rates in LBS initial/final front 259/334 initial/final rear 359/416


Your choices, (note I am not making a exclusion based on drop amount)

Tein H-tech 350z linear springs .3”/.2” drop on 350Z Sedan drop 1.4"/1.3"
Spring rates in LBS 358/375 (front rate felt softer then 358lbs, IMO)

Hotchkis 350Z Linear springs .6”/.8” drop on 350Z Sedan drop 1.6"/1.8"
Spring rates in lbs 340/330

RSR 350Z linear springs .6”/.6” drop on 350Z Sedan drop 1.6"/1.6"
Spring rates in LBS 345/417 (may be hard to find, company may have issues)

Tein S-tech 350z (fronts are progressive, rears are linear) .7”/.6” 350Z Sedan drop 1.7"/1.6" (looking at the front spring when mounted, has 1 maybe two coils max devoted to being a progressvie spring, meaning it won't have the rate change that other progressive springs have with higher high coil counts that become inactive).
Spring rates in lbs 386/402

Swift 350Z linear springs .8”/.6” drop on 350Z Sedan drop 1.8"/1.6"
Spring rates in LBS 336/364 (should be mentioned that they use a material that is light weight to make their springs)

Tokico D-spec 350Z linear springs 1"/1" Sedan drop 2"/2"
Spring rates 375/375 (not recommended with Koni shocks and certainly NOT with oem shocks of any kind) If run with D-spec shocks, higher shock settings should be run to try and keep you off the bump stops in the front.

Whiteline 350Z linear springs (control)
Front: Part # 73219,
Spring rate 365 LBS Drop: .8"-1"
Rear: Part # 73220
Spring rate 445LBS Drop: 1"-1.2"
(sold as 2 front springs and 2 rear springs)
Same shock advise as above. Would be safe to say sedan drop would be 2"/2.2"

In case this helps here is a picture of my sedan on Tokico 350Z D-spec springs and a 2" drop. However remember what I said above about shock stroke issues.

 

Thanks for that informative post. I like the drop afforded by the eibachs I just don't care for the progresive ride. I saw that Tokico is selling Dspecs with springs now http://www.tokicogasshocks.com/products/dspec/ They do not list any of the spring rates and whether or not they are progressive.