"Question on Eibach spring part number

[bob m]

I would like to use the "stock" Eibach springs in my 72 240z. All I can find are the performance springs that lower the car. Is there a part number for the standard springs? also, who sells them?

Thanks

Bob M

[Arne]

Neither Eibach nor anyone else currently builds stock replacement springs for 240Z, to my knowledge. Arizona Z Cars offers a much stiffer performance spring that doesn't lower the car, but that about it today.

Actually, I've never heard of Eibach making non-performance springs for any cars. Where did you hear of these?

[moritz55]

Bobm , I am in the process of getting my 240z back to stock height with new springs and shocks. The only Eibach "Performance Style" springs that get your 240z to stock height - however with a performance ride is if you use 1974/78 260z/280z srpings on your 240z.

Go to the bottom of this link, some of my observations: http://www.classiczcars.com/forums/showthread.php?t=36014

Arizona-Z is out of Stock Height Rear coils, so I'm installing the Eibach 260z/280z set from MSA. PN 6303-001 (front) and 6303-002 (rear).

The ride will be firmer, but the height will be perfect on the Rears, where as the Front will be possibly 1/4 inch lower... I'm cutting 3/4 of a coil from the fronts to get my car to have the front drop about 1/2" - 3/4" lower than stock level.

Here are the spring loads & lengths for stock 240z New Springs:

Front Load per spring: 562lbs (driver side) ... 604lbs (passenger side)

Front Spring Stock Length at Load: 8 inch (both sides)

Front Spring Constant: 83lb/in (both sides)

Rear Load per spring: 635lbs (both sides)

Rear Spring Stock Length at Load: 8.4 inch (both sides)

Rear Spring Constant: 104lb/in (both sides)

My original Rear springs after 37yrs of use .. ran 5/8" lower (7.78" loaded at 635lbs) so the overall spring constant degraded about 10% to 94lb/in (not to bad for 37yrs).

Anyway Eibach's spring PNs are: 6303-001 Fronts , 6303-002 Rears for a 260z/280z .. that I am using on my 240z to assure close to stock height, yet have a firmer ride.

Hope this helps and good luck..

Eibach 280z Spring-Data.doc

Edited December 10, 2009 by moritz55

[moritz55]

Well for those that may be interested in getting a 240z to stock height with a performance/progressive spring set.

I finished the installation of my Eibacks with MSA 240z Tokico HP shocks. I used the Eibach 280z coils for a '74-'78 260z/280z from MSA as I mentioned above, Fronts -001 and rears -002 as described with the kit.

They lower the 260z/280z about 1" ... but yield stock height when used on a 240z, yet with a firmer and better handling ride

My tires are 205/65/15's .. 3/8" higher than the stock tires (195/70/14) so I've reduced my measurements to account for this slight increase due to tire height...

==> Front true height (ground to fender tire arch) is: 26-1/8" (~1/2" lower than stock).

(I cut 1 full top coil off to lower it slightly from stock level).

==> Rear true height (ground to fender arch) is: 26-1/2" (~1/2" higher than stock)

(Rears installed as-is from Eibach, new MSA strut insulator for 240z and new MSA urethane spacers for 240z).

I really wanted my car to sit with the front 3/4" to 1" lower than the rear to keep the nose down when cruising on the highway. It turned out pretty close. The photos below reflect my recent installion with just about 10miles on the car. It may settle a little more over time.

Good luck...

Edited December 21, 2009 by moritz55