I noticed the other day, that the sig from a G35 coupe owner here said you have RSR springs on your car. I thought I saved the profile so I could pm you, but nope. If your that person, please reply here or pm me.

 

rs*r has just released the G35 downsprings. i will get you specs on it tomorrow!

 

Thanks, I'm curious to hear from someone running the current Z33 spring on the coupe.

On RSR's pending V35 fitment,....god, let them be linear. It will be interesting to see how much softer they are then the Z33 fitment.
Please do post the rates and specs.

 

Hi, that was me that was running the Z33 springs on my coupe. Just PM me with any questions.

 

Great, pm sent.

Thanks,

 

RS*R G35 Downsprings

Drop:

1.0 front / 1.2 rear

Spring Rate:

315 front / 315 rear

MSRP $329.

 

koji-
are those specs for the coupe or the sedan? and are the springs linear or progressive?

Thank you

 

I was thinking about these springs, but I was more interested in them when I thought the drop was .6" all the way around....I am looking for a moderate drop w/ a linear spring....

 

those specs are for the coupe. the RS*R downsprings are a progressive spring.

the progressive design is perfect for the street enthusiast.

 

The .6" drop was for the 350Z springs that can be used on the G coupe

 

I will not touch progressive, street or track, I will not make the compromise on performance and at the limit behavior for comfort sake.

What a minute, " RS*R downsprings are a progressive spring? I called, tech said the 350Z downspring is linear, or are you just saying the coupe application is progressive.

 

I think their thinking behind this was that the coupe is more of a luxury-sports car than a sports-luxury car and that was the reason that the coupe-specific springs are progressive (way to differentiate yourself within the market *shakes head*) - and that's the reason why I'm still looking for a set of 350Z linear springs...

 

Hi Koji - Thanks for replying to the thread! Yes, there IS a desire for a stiffer (than OEM Sport suspension) linear spring application for G35 sedan with only a 0.6" drop. Using your 350z/G35 coupe springs (I thought they were linear too?) gives WAY too much drop for some G35 sedan owners. Nobody else is offering a *slightly dropped* linear spring specifically for the sedan yet. How 'bout it?

 

thanks again for all the comments. The 350Z spring is as follows:

Front Spring - Progressive Design.
Rear Spring - Linear Design.

Why the difference? RS*R spring designers have spent a considerable amount of time between different designs for the springs. When all is said and done, this design; drop, spring rate, linear vs. progressive, netted the best spring design for what RS*R lowering kits stand for.

dholly: by using the 350Z spring in the G35, you will be getting a big drop due to the weight difference and overall characteristic differences between the cars.

the G35 springs are progressive for both front and rear. The engineers at RS*R have done a fantastic creating two springs that compliment the specific cars very nicely. Remember, we have both the 350Z and G35 springs.

350z Part #: 30-N200 (down spring) 32-N200 (Ti2000)
G35 Part #: 30-N400 (down spring) 32-N400 (Ti2000)

 

Well that's interesting...I have been under the impression that mixing the different spring types would net poor results! Thanks for the clarification. Perhaps someone else can verify this but, in order to end up with a 0.6" drop on a G35 sedan, I think you would need to add about 1" more to the height to your RS*R G35 coupe springs as the 350z/G35 coupe oem spring and strut height is about 1" shorter than the G35 sedans. Is this correct?

Again, I'd love to have a stiffer spring set that dropped my sedan only 0.6". Man, let those engineers loose!

 

A special thanks to koji@rs-r for going out of his way to open a box of Z springs and taking this picture. Of special note is that I only see maybe one coil devoted to being progressive on the left spring in the pic below (it's a front spring).

 

Out of all the known 350Z lowering springs, none are totally linear. Tein S-tech's have rear linear, but fronts are progressive and they have more coils devoted to the progressive part than the RSR springs. I called Mackinindustries, they distribute Espelir springs. I asked them, are the springs linear, they said yes, but somthing in his voice said he REALLY didn't know the answer. Then I discovered a pic of all 4 Espelir springs from a members install thread, gee very progressive front and rear. Stinks because their a nice mild 10mm drop and their stiffer than the RSR's,.......sigh.

If you want a totally linear drop spring, Eibach say's they can make you one, but the drop amount for such a endevor, might be hard to plan out and I have not actually called them. In related new's Ground-Control has pushed back the release of a sleave coilover set for the Z, that would be a way for someone to get linear springs and pick your rate.

I think the reason we don't see a totally linear spring for these cars is because the oem struts don't have a lot of room to contain stiffer linear springs. But, now we have aftermarket shock's coming on line, that hopefully will see someone filling the gap to work with these new shocks with stiffer linear springs. I'm thinking about Tokico's D-spec shock, which double adjustable for rebound AND compression.

Here's a pic of a front Tein S-tech spring next to a oem front spring, notice the 3 coil's close together at the top of the green Tein spring.

 

The Nismo S-tune suspension has maybe one coil devoted to being progressive on the front springs, while the rear springs have a bunch, and the S-tech springs are front progressive, rear linear. Not building a case for progressive, just mentioning that mixing the two types does happen.

On the question of 350Z/G35 coupe spec'd lowering springs being a addtional inch shorter than their published drops when installed on a sedan, yes that is correct. The Z and coupe use shorter springs AND shorter bodied struts. So .6" Z drop spring on a sedan would lower it 1.6" ect.

 

Sidenotes:

The Z, G35 coupe and sport suspended sedan, all ride on oem spring rates that are extreamly close to one another, actually said to be the same. As mentioned the Z and coupe have lowered ride heights and shortened shock's vs the sedan. Where they truely differ is that the Z get's much more aggresive shock valving. With the Coupe and sedan with sport said to be valved the same (I have zero reason to not agree with that). The non sport sedan of course get's milder shock valving and softer springs (in the -10% range) Interesting note, Eibach's development car for their sedan springs, was a non sport.

Oem sway bars, they all use the same bar diameters, so buying anyone's used oem sway bars off a Z let's say, does you nothing.

I'm almost positive I'm going to buy a set of the RSR springs to test. I'm thinking I'll test them for a couple months or so and then resell them and get some stiffer custom linear springs made to run with the Tokico shocks I want. One major problem are my high flow cat's, I need to raise them up a bit so I can have decent ground clearance, they scrap on mild speed bumps as it is.

 

Thank you! Pics are worth a thousand words and those most definitely helped. If I had a G35 coupe, after this enlightenment session, I'd probably be all over these G springs. Koji, if RS*R happens to be planning any G35 sedan specific springs following the same design philosophy, I would be very interested so long as the drop from stock was around 0.6". Thanks again, good info all.