They will work, however, the springs alone won't be an optimal solution for you. The quote below is from a previous post in this thread by Gsedan35 (commonly accepted on this forum as somewhat of a G suspension guru).

Unrevised Z springs are stiffer than sedan non-sport springs. I would take his suggestion and upgrade shocks at the same time to any of the options he lists above.

 

I was in the same boat a few days ago... Was considering OEM 3350Z springs... after reading boatloads of info out here I realized that with non-sport sedan suspension the unrevised springs do no good... either get full revised suspension (springs and shocks) or unrevised springs with 05-06 Z or coupe shocks, or aftermarket shocks.

I decided to just get Eibachs - they are designed for stock shocks and supposedly the R&D for the sedan Eibach Pros was done on a non-sport G sedan... this was posted by GSedan35 and I called Eibach directly (to ask some other questions)... They in fact used one of their employee’s car for R&D and he confirmed it was a non-sport sedan... So Eibachs for me... Good luck.

 

I picked up a set of unrevised springs for my sport shocks today. I hope it drives more solid. I'm use to coilovers, sway bars, wider and stickier tires on my Accord and the 4x4 on my G, i have to be careful on sharp turns.

 

So did you need to get a camber kit? Any issues?

 

get it through eibach their camber kit is actually the same kit that SPC sells for 218 dollars but the eibach (SPC) kit is 140.

 

I just got the unrevised z springs installed today. First impression: more stable, flatter in turns, less dive and squat, not floaty at higher speeds, and the ride is not degraded at all as far as I can tell. All that was expected, or hoped for, so I'm happy. I will say I can understand why some use G35 coupe springs in the rear, where the gap is slightly less in the back than the front with all z springs. But the car sits level so I have no problem with that.

 

Ok. I too am a bit confused... I have the OEM sport suspension on my '06 G35 Sedan. I would like to lower it, and use the stock sport shocks.

Revised or unrevised?

350z rear springs or coupe rear springs?

 

^Your OEM spring rates:

Oem linear springs
G35 coupes with oem 17’s & 18’s (non-sport)
G35 sedan’s with sport suspension
350Z’s 2003/2004 (unrevised)
Front:314 Rear:342


From this thread:

The Godfather of All G35 Aftermarket Springs & Coilovers Thread


You're looking for unrevised 350z springs from 2003-2004 350z's. Matching up spring rates will help with shock life. I also have a 2006 sport sedan, and had 350z springs front/back for awhile. The front wheel well makes it look like the front sits higher. Just switched out the non-sport g35 coupe springs in the rear recently to even things up a bit.


Here's alot of pics in this thread:

G35 Sedans with 350Z Suspensions Thread

 

holy old thread. Yes go with unrevised springs from either the G coupe or Z to match the rates of your sport shocks/struts. If you have more than 50K miles, I would swap everything and go with a complete revised Z suspension. If you're under and the shocks/struts are in good shape, it just a matter of a 1" drop in the rear with the Z springs, or about a 1/2"-3/4" drop with the coupes.

Personally I went with the G coupe springs in the rear because I felt the Z springs gave too much of a drop in the rear. Its more evened out with the coupe springs in back. Ive been on this setup for about a year with my sport shocks and the car has been riding great.

 

i also installed 350z revised springs yeserday i love it just need to get coupe springs for rear this week..got all 4 350z springs with 5k miles $35 all 4 den coupe springs with 17k miles for $40 all four can't beat that knw need to sale coupe front springs and 350z rear springs

 

im pretty the revised the Coupe and Z springs are the same length.

 

i mean unrevised

 

I have a question? I have tokico hp blue shocks and I was wondering if it's ok to use them with revised front z springs and the rears with couple springs?