Ok, thanks to a great fantasy football season (special thanks to Cam Newton) I now have some extra $ to put into my Z.
I'm looking into the Tokico D-specs with the RSR springs, this seems to be a pretty good set up from the reviews that I have read. If anyone has this set up please let me know what you think.
This will be going on my 04 (non revised springs) roadster.
Rims and tires will be 245/35/19 and 275/35/19. (looking to buy)
This is my summer daily driver only, so I think the 1/2" drop will be perfect for my area.

 

Why not just go for the Tokico springs that are matched for the shocks?? By not matching the springs rate to the shock valving you might end up with a setup that does not dampen bumps well and might bounce alot after a bump. Are you not wanting a 1 inch drop?

 

I was looking at the tokico's springs, but with the 1" drop I would have to start looking at Camber kits, plus I like the RSR spring rate LBS 345/417. With the adjustable D-specs I should be able to tune them to the the stiffness of the rear springs
If anyone else has any opinions, please post them

 

D-specs according to Tokico have a rate capacity up to 450lbs. But someone I trust, John Coffey has dyno'd them and in his opinion can run up into the 500 neighborhood (I think the discussion did center around rear rate capacity vs the front just so say it).

Some other less then one inch spring choices and a recap on oem rates

350Z oem spring rates (all models except 2007-2008 Nismo Z)

2003-2004
314/342

2004.5-2008 (it is my understanding that all 2004 roadster production have this setup)
314/427

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

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

*Cobb Tuning 350Z Linear springs .75"/.9"
Spring rates 436/535 (as shown here http://g35driver.com/forums/brakes-s...new-parts.html ) Notes: Too much rear spring for all oem shocks, Tokico D-specs, even Koni’s I see nothing wrong with running oem 427lbs rear springs on cut down upper mounts.

Tein S-tech 350z (fronts are progressive, rears are linear) .7”/.6”
Spring rates in LBS 386/402 (estimated front intial rate is 327lbs)

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

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

Kg/mm springs 350Z
DR21 super sport 15mm drop
Spring rates in lbs initial/final front 246/398 initial/final rear 252/409

Espelir 350Z progressive springs .4"/.4" drop
Spring rates 386/515 (rear rate IMO is too high for all oem shocks, Z or G)
Noetes: Often purchased by owners chasing high spring rate numbers, often then resold when they don’t deliver what the owner wanted, to be expected since they are progressive,


*No longer in production, Cobb lists the spring rates on these as lower then what I show.

 

hey..where are my Nismo S Tunes?

 

Didn't include them since you cannot buy the springs seperate and he's asking about D-specs for his shocks. Figured it might confuse some is I did include them.

 

Good info on the spring rate capacities of the Tokico shocks. At least if I want to switch out my springs for ones that lower the car more i can.

 

2004.5-2008 (it is my understanding that all 2004 roadster production have this setup)
314/427
Are you sure about this? According to my Vin# I have the old style.

 

Yes, that that's what I remember.

Easy way to tell if I'm right or wrong.

Look at your rear shocks.

Smooth sided dust covers.
Shock part numbers on a adheasive sticker with yellow on it
=Revised suspension

Dust covers with a cross hatch pattern
Shock partnumbers stamped into the steel side of the shock body
=unrevised suspension

Let me know. I've never seen a 04 roadsteer that didn't have the revision.

 

I will check it out tomorrow. You seem to really know alot about the different springs for our cars, what is your opinion on the RSR springs?

 

Understatement if there ever was one..

 

You are right! I found yellow sticker on the shock.
Thanks again for the great info