Anyone ever use these or have them installed? Im going to install them this weekend so i will post my thoughts on them. Its a 1.2 drop so that nasty tiregap will be gone. Im also installing my Nismo Exhaust, Injen Intake, Insaneamine Grounding Kit, and my Clear Corners, so its gonna be a great weekend for my Z!

 

I don't have them and I've never seen a member that does, but here's the spring rates for them in case it helps you.

Tanabe Sustec GF210 front 336lbs rear 375lbs
Tanabe Sustec NF210 front 314lbs rear 353lbs

Stock is
347/419

 

I have those, and I can tell you the advertised rates Gsedan35 has posted are an error.

I bought them from David @ 350Zforums.org and gave him feedback after install. He researched with Tanabe and verified that they are rated 25% stiffer than stock and they are at least that.

 

NO the rates are not an error, the math doesn't lie, but marketing people do. Keep in mind that the rates I posted above for the Tanabe's may only be the initial spring rates. Since the Tanabe's are progressive, they would have a initial rate and a final rate. Eibach tells you both rates. Tein's published rates for their progressive lowring springs are their final rates, but I called to find that info out. This isn't the only car I have followed stock oem spring rates on, spring makers paste each spring line with a universal claim that the entire line offers a said increase over stock. H&R for instance says their sport spring is 30% stiffer than stock for all applications, and RSR says their spring is 30% to 50% stiffer, again as a product line. I have a set of 350Z springs that I will gladly send to any shop that is willing to put them on a spring tester. Frankly, if anyone can name a shop that can test them, the spirngs are as good as their.

 

All I'm saying is they are much stiffer than stock. Granted, there is often a gap between manufacturers' unqualified claims and as-installed reality (a subject that has already been covered at length).

Mofoz wanted input about the springs and -- being a user of the product in question -- I answered, recognizing that the numbers you supplied could naturally lead him to think they were softer than stock when, in reality, they stiffen up the suspension noticeably.

BTW, my understanding was that they are not progressive. But, if they are, the progression is minimal/worthless.

 

would the 350Z's GF210 fit on the G35C?

 

Whoa, good grief, the oem rate info listed above most certainly IS WRONG!!! I was wrong! Very sorry public apology for how I defended my data and it was incorret, lateapex's, your comment's are justified, I understand.

I relied on someone I trusted to crunch the rate math, and for whatever reason, the number came back incorrect to me. When BJ at 350EVO got different rates on the rear springs off a coil spring rate tester, I knew something was wrong. So I went out and remeasured the springs and did the math myself, thus showing the error. I did a post explaining that, but this board doesn't allow me the the ability to go back and edit my pervious post's to correct past error's, or I would have correct every instance where the incorrect data was posted. Of note is the fact that Hotchkis has come out and said the oem rates are 310/350, I got 314/342. We are close enough to each other to verify each other, the difference can be explained by normal coil spring rate tester +or- error.

So here's the correct oem rate data and how the Tanabe springs differ from oem.

Oem 350Z*
314/342
(*2003, the revised 2004 suspension is rumored to use slightly stiffer springs, unconfirmed to date)


Tanabe GF210 Series 350Z
336/375 F+7% R+10%
Transfers +3% roll stiffness to rear

Tanabe NF210 Series 350Z
314/353 F+0 R+3%
Transfers +3% roll stiffness to rear

Tanabe NF210 Springs G35 COUPE
297/336 F-5% R-2%
Transfers +3% roll stiffness to front

Tanabe DF210 Springs G35 COUPE
308/353 F-2% R+3%

 

Yes, in fact G and Z springs in 2003 are the same exact oem parts, the revised 2004 Z is alledged to use slightly stiffer springs. 350Z lowering springs are a better choice for the G if your after performance. We have seen a few install's of RSR 350Z springs on the G, and the results have been very positive, even though the G use's much softer shocks then the Z. Of note is that the RSR 350Z springs are mostly linear.

RSR 350Z springs (just a wee bit progressive F&R, maybe one coil is progressive)
345/417 F+10% R+22%
Transfers +12% roll stiffness to rear

RSR G35 coupe springs (progressive front and rear)
315/315 F+0 R-8%
Transfers +8% roll stiffness to front

Hotchkis 350Z springs (linear springs)
340/330 F+8% R-3%
Transfers +12% roll stiffness to front

Tein S-tech 350z (fronts are progressive, rears are linear)
386/402 F+23% R+16%
Transfers +7% roll stiffness to front

Tein H-tech 350z (fronts are progressive, rears are linear)
358/375 F+14% R+11%
Transfers +3% roll stiffness to front

Tein H-tech G35 coupe & sedan(fronts are progressive, rears are linear)
324/260 F+ 5% R-22%
Transfers +27% roll stiffness to front

Tein S-tech G35 coupe & sedan (fronts are progressive, rears are linear)
358/274 R+14% R-18%
Transfers +32% roll stiffness to front

Tanabe GF210 Series 350Z
336/375 F+7% R+10%
Transfers +3% roll stiffness to rear

Tanabe NF210 Series 350Z
314/353 F+0 R+3%
Transfers +3% roll stiffness to rear

Tanabe NF210 Springs G35 COUPE
297/336 F-5% R-2%
Transfers +3% roll stiffness to front

Tanabe DF210 Springs G35 COUPE
308/353 F-2% R+3%
Transfers +5% roll stiffness to front

Tanabe NF210 Springs G35 SEDAN
297/269 F-5% R-21%
Transfers 17% roll stiffness to front

Tanabe DF210 Springs G35 SEDAN
286/280 F-9% R-18%
Transfers +9 roll stiffness to rear

Kg/mm springs 350Z
DR21 super sport 15mm drop
246/398 front 252/409 rear

Kg/mm springs 350Z
DRacing 30mm drop
252/454 front 252/482 rear

Espelir coupe springs (the U.S. importer recently changed specs, I do not believe the newly listed specs are correct, since the new one's are extreamly high. And when I called the company to ask if the springs are linear or progressive, they told me Linear, turn's out they were absolutley wrong, they are in fact progressive. I show the old specs for those reasons, take it with a grain of salt, same thing for the 350Z fitment)
409/460F F+30% R+37%
Transfers +7% roll stiffness to rear

Espelir 350Z springs
381/460 F+22% R+37%
Transfers +15% roll stiffness to rear

 

cool thanks!

i think i'm going to order the tanabe GF210 springs for my G. although the performancenissanparts.com guy suggest i go with the NF210 for the G35 since it offers a lower drop. i think 1"/1.2" drop for the GF210 is enough, dont you think?

 

I have them on my Z, Install was a cake walk, took under 2 hours. The ride is slightly bumpier than stock but i preffer to feel the road and you will with these. Overall they are the bomb! the car handles better than stock. heres a couple pics. Overall I have lowered 1 1/2"

 

another

 

one more

 

rear