https://g35driver.com/forums/showthr...24#post2831724

Mods, let it hang around here a bit before you move it to brakes and suspension

 

For 350Z springs--will drop a sedan 1" on all 4 corners.
Fronts are 314 spring rate and have 1 pink dot and 1 orange dot. Coils are tighter and most have the rubber sleeve on them.(2007-2008 models have 1 white and 1 orange dot) Tech farmer mentioned some z springs front may have only 1 pink dot z front are confusing

Rears(revised,2004.5+) are 427 spring rate and have 2 red dots and 1 purple dot.
(2007-2008 models have 2 red dots and 1 blue dot)

Rears(unrevised 2003,some 2004) are 342 spring rate and have 2 red dots and 1 white dot.(1 white dot)

 

For coupe springs: Lowers a g sedan 1/2" on all 4 corners

Fronts: 314 spring rate with 1 white dot.(1 white dot)

Rears from a coupe with OEM 17s/18s: 342 spring rate with 3 red dots

Rears from a coupe with OEM 19s: 427 spring rate with 2 red dots and 1 purple dot

 

I believe the above to be accurate, if not feel free to chime in.
(mouse over the name of pic, to see what you're looking at)
Hopefully this helps with sedan owners configuring a front z spring and rear coupe spring set up.

Spring rate reference from sticky:

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

Oem linear springs
G35 sedan's with non sport
Front: 283 Rear: 308

Oem linear springs
G35 coupes 2005/2006 with oem 19’s only
350Z 2004.5 to 2008
Front:314 Rear:427

 

my friend used my oem springs since i had sport 19s and used z springs too for his sedan

 

Good information. I had someone ask me these questions and couldn't remmeber. Hopefully they will see this post.

 

^^great, if anyone reading this sees anything incorrect, let me know by pm(or just reply). If it is indeed incorrect, I will edit.

 

I am running tein 350Z H-tech front springs and stock 350z rear springs. It's a nice look

 

Wow they really jacked up the rear rates on the later models. Wonder how that rides

 

When I move this I will add the additional content to the FAQ sticky.

 

I put revised Z springs and shocks and struts on my car and it sits perfectly for me.

I tried to do the exact same thing on my girls G35x and her springs had a green and white dot on the fronts and two red dots on the rears.

her car lowered about the same maybe a tad more in the rear than mine did but her front doesn't look like it came down at all ????? Pisses me off and it had to be the PITA to put on fronts that needs to be redone......

any suggestions ?

also I think the rear of her car doesn't ride a harsh as mine does. I don't understand what the numbers on the spring rates mean

 

Wow I must be an idiot. I always thought the colors were where the paint started to chip. Lol.

 

Great info I was looking for this, I did the 350z/coupe combo but then I changed to Tein Htechs and could not figure out which springs came from what car once I took them off. lol thanx man

 

I used 350Z S-Techs up front and unrevised 350Z springs in the rear with Tokico 350Z D-Specs. The S-Techs dropped it too much in the rear.

 

I just bought some "coupe springs" from the marketplace, but they are the exact same size as my oem g35x springs. Same size; same dots (2 yellow/front; 2 yellow,1 pink/rear.) Bought them from a guy with an x...
Do they look identical or did I get screwed?