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Eibach springs

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Old Apr 16, 2004 | 08:16 AM
  #1  
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Default Eibach springs

I am considering buying a set of Eibach springs from a guy on the forum, is it OK to use the set made for the coupe? Is there one made for the roadster? Thanks.
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Old Feb 19, 2006 | 04:57 AM
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Default Apparently so...

When I bought mine they said there where two types one for coupe and one for roadster. My problem now is do I install them with or without adjustable componets... it seems many owners wind up spending hundreds on caster/camber adjustable pieces because the stock ones don't offer enough adjustability.... grrrrrr
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Old Feb 19, 2006 | 02:39 PM
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from my underdstanding, there's only one set that fits both coupe and roadsters...maybe someone can prove me wrong...Im using eibach on roadster and i think it states coupe/roadster.
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Old Feb 24, 2006 | 07:52 AM
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From my understanding, there are two different sets. However, in regards to the camber/caster problem, because the Eibach Springs lower only 1" max, you can just go in for a realignment at your local shop and get it back to stock with stock arms. So I hear...
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Old Mar 4, 2006 | 06:10 AM
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Eibach's prokit offering for the 350Z coupe and 350Z roadster/convertible are the same spring, same identicle part numbers, same published drop amounts (1"/1" for both).

Here's a cut and paste from a recent post I did concerning Eibach springs on the 350Z and alignment, it's very much on topic considering what you guy's have brought up above.

Originally Posted by Gsedan35
How do I put this,..... hmmm

As a member that has been here since 2003 and takes a rather disturbing interest in most things suspension, I once did a mass search awhile back looking at all eibach spring install posts and what happened concerning alignment. This is the result of that search.

1. Most of the owner's that did bother to align the car were not able to bring the car back to within oem front and rear specs, several owners purchased front and rear camber correction arms to bring the car back with oem specs.

2. Some of the owner's in the above group only added aftermarket correction in the rear, feeling that the ($400 or higher) expence of adjustable front upper arms was not worth the cost, basically the car was not out enough to warrant the cost in their minds.

3. A few like to claim that the car was within specs, but I never ever say a post where they talked about actual specs when that was said. And frankly, we have too much data on hand that points to the fact that past a .8" drop you'll be out of oem specs.

4. For the others, they either like the look of a lot of camber or they just don't care.

BTW, you CANNOT adjust the camber in the front of the car without the use of aftermarket upper control arms.
In case anyone was wondering, here are the spring rate specs for the springs.

Eibach 350Z progressive springs 1”/1” drop*
Spring rates in LBS initial/final front 296/384 initial/final rear 316/421




G35 sedan 6mt
Koni coilover front 448lbs
Koni shock rear 342lbs
Hotchkis front bar set to med
350EVO rear bar set to med
Crawford plen
Custom TD injen
HF cats
K&N panel
Rogue short shifter
Enkei RPM2
BfGoodrich KD
245/40-18
265/40-18
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Old Mar 4, 2006 | 06:54 AM
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Sweet, thanks for the info gsedan!
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Old Mar 4, 2006 | 10:02 AM
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hi guys.... i'm from germany and just ordered what you call a track version roadster, we only have one modell!!! i bought the sprimgs from Cobra, now i heard they don't produce them, they're supposedly eibach springs... i'm not really sure coupe and roadster springs differ; try contacting ctd great britain, you'll find them on google... they helped me!!!

c u on the autobahn
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Old Mar 7, 2006 | 09:47 PM
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actually there are two different part numbers for the eibach springs...one for coupe, one for roadtser

http://www.grubbsperformance.com/Mer...de=350ZSprings

EIB6372140 (roadster)
EIB6364140 ( coupe)

I just found out I'm using coupe springs for my roadster.
how are they different? does anyone know????
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Old Mar 8, 2006 | 12:16 PM
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Yeah, that's what I thought...two different springs for Z and ZR. I don't know how they are different though.
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Old Mar 8, 2006 | 09:33 PM
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Originally Posted by visionboy
actually there are two different part numbers for the eibach springs...one for coupe, one for roadtser

http://www.grubbsperformance.com/Mer...de=350ZSprings

EIB6372140 (roadster)
EIB6364140 ( coupe)

I just found out I'm using coupe springs for my roadster.
how are they different? does anyone know????
If you visit the Eibach web site you will find that they do not list different part numbers for roadsteer's or coupes. EIB6364140 is the correct part number listed for both cars. The other part number is not even listed for the 350Z. Oem spring rates are not different from 04.5+ coupes to roadsteers, I know I have measured both for spring rate.

http://www.eibach.com/cgi-bin/start....ach/index.html

Last edited by Gsedan35; Mar 8, 2006 at 09:39 PM.
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Old Mar 9, 2006 | 01:16 AM
  #11  
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I just had the Eibach pro-kit springs installed on my roadster 2 weeks ago. They actualy shipped the wrong springs (for the coupe) the first time. They had to return them and have Eibach re-ship springs for the ZR. The guys at mossy performance did note that they are different part numbers. I have a 2006 ZR if that makes any difference. Also seems little more dropped than the published 1.2" F/R but it sure looks sweet.

I brought it in for a re-alignment and the guys said that they got it pretty damn close to spec considering how low it looks.
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