MENU

Home

Pictures

Z31 Repairs

Z31 Modifications

Z31 Information

Z31 Fiche Index

Z31 FAQs

Other

Links

The Z Registry

In case you want to know
how I'm doing,

Deer Valley, Arizona
Click for Glendale, Arizona Forecast

e-mail me

18855 hits
since 03/25/2005

ZBUM's Z31 300ZX Spring Information Page

There are many spring options available for the 1984 - 1989 300ZX. In addition to the normal aftermarket springs available (Eibach, Tokico, Suspension Techniques, Intrax, etc) you can also use springs from other Z31s. All Z31 springs interchange with no fitment issues. 87-89 turbos have fairly stiff springs and the springs from an 88SE (SS if you prefer) are about the hardest springs you can get without special ordering a set. Some common aftermarket spring rates are shown below. Note the Eibachs, they are variable rate springs. Variable rate springs are often touted as "wuss springs" because of their softness when uncompressed. Linear rate springs are generally better for performance but much worse in the ride department. All the non-nissan springs below will lower your car approximately ¾ to 1-½ inch from stock depending on the condition of your current springs.

SS springs are a rare commodity now, as the Nissan supply of them was depleted in March 2000. A trickle of SS springs are available at various large dealerships as they pop up in Nissan's inventory in Japan. Check Courtesy Nissan if you insist on buying them new ($112 EACH, $85 EACH from courtesy. You need 4.) Since they were so popular, they should start popping up in junkyards. All stock springs are color coded for their application. SS springs have white and purple marks on the rear springs while the fronts have orange and pink marks. If you get harder springs you also need firmer shocks to hold the springs.

While the Z31 springs will fit in any Z31, there will be a slight shift in ride height depending on what model you have and what springs you end up using. So, if you use the 84 2 seater GL spring in an 88 2+2 turbo, you might find your car sitting slightly lower than before.

Aftermarket Springs Available
 Front
(in lb/in)
Rear
(in lb/in)
Lowers
approx.
f/r
AVO / Chassis Dynamics??????35mm
B+G138-1471751.6"
Eibach140-240183-2540.75"
Intrax107-4231191.3"
Jamex??????35mm
Kingsprings19030025-30mm
Motorsport Auto1521680.75"
Suspension Techniques2002261.0"
The Specialty Shop300324½"/0"
Tokico1501651.0"
Whiteline18024030-40mm
Nissan - 88 SS2072240*
Nissan - 84AE + 86T146188.20*
Nissan - 87-89 turbo196188.20*
Nissan - All others136.11400*
* see charts below to determine affected ride height. The most you should see would be about 1/2" difference.

Stock Front Springs
Spring #color code
(top / bottom)
Wire Diamter
mm(in)
Coil Diameter
mm(in)
Free length
mm(in)
spring constant
N/mm (kg/mm, lb/in)
#1red-1 white-113.5(0.531)170(6.69)293.5(11.56)23.83(2.43,136.1)
#2white-1 white-113.5(0.531)170(6.69)306.0(12.05)23.83(2.43,136.1)
#3yellow-1 white-113.5(0.531)170(6.69)300.0(11.81)23.83(2.43,136.1)
#4white-1 white-113.8(0.543)170(6.69)306.0(12.05)23.83(2.43,136.1)
#5yellow-1 white-114.0(0.551)170(6.69)300.0(11.81)23.83(2.43,136.1)
#6blue-1 white-113.8(0.543)170(6.69)312.5(12.30)23.83(2.43,136.1)
#7yellow-1 white-113.8(0.543)170(6.69)294.5(11.59)25.5(2.6,146)
#8yellow-1 orange-114.8(0.583)170(6.69)268.5(10.57)34.3(3.5,196)
#9blue-1 orange-113.9(0.547)170(6.69)318.5(12.54)23.83(2.43,136.1)
#10orange-1 pink-114.5(0.571)170(6.69)263(10.35)36.3(3.7,207)
Spring Code / Applied Model
Spring
Code
YearModelGradeRoofEngine
#1842 seaterSF/GLALLNA
#1842 seaterALLALLT
#2844 seaterALLALLNA
#3842 seaterGLLALLNA
#3844 seaterALLALLT
#485-862 seaterGLLALLNA
#4854 seaterALLALLT
#5852 seaterALLALLT
#585-862 seaterSF/GLALLNA
#687-892 seaterALLALLNA
#685-864 seaterALLALLNA
#7842 seater50th AEt-topsT
#786ALLALLALLT
#887-89ALLALLALLT
#987-894 seaterALLALLNA
#10882 seaterSSt-topsT

Stock Rear Springs
Spring #color code
(top / bottom)
Wire Diamter
mm(in)
Coil Diameter
mm(in)
Free length
mm(in)
spring constant
N/mm (kg/mm, lb/in)
#1red-1 yellow-212.8(0.504)110(4.33)364(14.33)24.5(2.5,140)
#2yellow-1 yellow-213.0(0.512)110(4.33)370(14.57)24.5(2.5,140)
#3white-1 white-213.0(0.512)110(4.33)376(14.80)24.5(2.5,140)
#4red-1 white-213.2(0.520)110(4.33)382(15.04)24.5(2.5,140)
#5red-1 white-213.2(0.520)111.2(4.38)382(15.04)24.5(2.5,140)
#6white-1 yellow-213.0(0.512)110(4.33)376(14.80)24.5(2.5,140)
#7white-1 yellow-213.2(0.520)110(4.33)376(14.80)24.5(2.5,140)
#8purple-1 yellow-213.8(0.543)110(4.33)336.5(13.25)33.0(3.36,188.2)
#9white-1 yellow-213.0(0.512)111.0(4.37)376(14.80)24.5(2.5,140)
#10purple-1 yellow-213.8(0.543)111.8(4.40)336.5(13.25)33.0(3.36,188.2)
#11green-1 yellow-213.3(0.524)111.3(4.38)388(15.28)24.5(2.5,140)
#12pink-1 white-213.8(0.543)111.8(4.40)341.0(13.43)33.0(3.36,188.2)
#13white-1 purple-113.5(0.531)110.0(4.33)317.0(12.48)39.2(4.0,224)
Spring Code / Applied Model
Spring
Code
YearModelGradeRoofEngine
#1842 seaterGLhardtopNA
#184allGLALLT
#2842 seaterGLt-topNA
#2844 seaterGLALLNA
#284allGLLALLT
#285allGLALLT
#3844 seaterGLLt-topNA
#4854 seaterGLLt-topNA
#485-862 seaterGLLt-topNA
#587-89allGLt-topNA
#685allGLLALLT
#685-86allGLt-topNA
#6862 seaterGLhardtopNA
#7864 seaterGLLt-topNA
#8842 seater50th AEt-topsT
#886allALLALLT
#987-892 seaterGLhardtopNA
#1087-89allGLALLT
#1187-89allGLLt-topNA
#1287-89allGLLALLT
#13882 seaterSSt-topT