Table of Contents
Stock Spring Information
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.
| Front (in lb/in) | Rear (in lb/in) |
|
|---|---|---|
| 88 SS | 207 | 224 |
| 84AE + 86T | 146 | 188.2 |
| 87-89 turbo | 196 | 188.2 |
| All others | 136.1 | 140 |
Front Spring Breakdown
| Stock Front Springs | |||||
|---|---|---|---|---|---|
| Spring Code | color code (top / bottom) | Wire Diamter mm(in) | Coil Diameter mm(in) | Free length mm(in) | Spring constant N/mm (kg/mm, lb/in) |
| #1 | red-1 white-1 | 13.5(0.531) | 170(6.69) | 293.5(11.56) | 23.83(2.43,136.1) |
| #2 | white-1 white-1 | 13.5(0.531) | 170(6.69) | 306.0(12.05) | 23.83(2.43,136.1) |
| #3 | yellow-1 white-1 | 13.5(0.531) | 170(6.69) | 300.0(11.81) | 23.83(2.43,136.1) |
| #4 | white-1 white-1 | 13.8(0.543) | 170(6.69) | 306.0(12.05) | 23.83(2.43,136.1) |
| #5 | yellow-1 white-1 | 14.0(0.551) | 170(6.69) | 300.0(11.81) | 23.83(2.43,136.1) |
| #6 | blue-1 white-1 | 13.8(0.543) | 170(6.69) | 312.5(12.30) | 23.83(2.43,136.1) |
| #7 | yellow-1 white-1 | 13.8(0.543) | 170(6.69) | 294.5(11.59) | 25.5(2.6,146) |
| #8 | yellow-1 orange-1 | 14.8(0.583) | 170(6.69) | 268.5(10.57) | 34.3(3.5,196) |
| #9 | blue-1 orange-1 | 13.9(0.547) | 170(6.69) | 318.5(12.54) | 23.83(2.43,136.1) |
| #10 | orange-1 pink-1 | 14.5(0.571) | 170(6.69) | 263(10.35) | 36.3(3.7,207) |
| Spring Code / Applied Model | |||||
|---|---|---|---|---|---|
| Spring Code | Year | Model | Grade | Roof | Engine |
| #1 | 84 | 2 seater | SF/GL | ALL | NA |
| #1 | 84 | 2 seater | ALL | ALL | T |
| #2 | 84 | 4 seater | ALL | ALL | NA |
| #3 | 84 | 2 seater | GLL | ALL | NA |
| #3 | 84 | 4 seater | ALL | ALL | T |
| #4 | 85-86 | 2 seater | GLL | ALL | NA |
| #4 | 85 | 4 seater | ALL | ALL | T |
| #5 | 85 | 2 seater | ALL | ALL | T |
| #5 | 85-86 | 2 seater | SF/GL | ALL | NA |
| #6 | 87-89 | 2 seater | ALL | ALL | NA |
| #6 | 85-86 | 4 seater | ALL | ALL | NA |
| #7 | 84 | 2 seater | 50th AE | t-tops | T |
| #7 | 86 | ALL | ALL | ALL | T |
| #8 | 87-89 | ALL | ALL | ALL | T |
| #9 | 87-89 | 4 seater | ALL | ALL | NA |
| #10 | 88 | 2 seater | SS | t-tops | T |
Rear Spring Breakdown
| Stock Rear Springs | |||||
|---|---|---|---|---|---|
| Spring Code | color code (top / bottom) | Wire Diamter mm(in) | Coil Diameter mm(in) | Free length mm(in) | spring constant N/mm (kg/mm, lb/in) |
| #1 | red-1 yellow-2 | 12.8(0.504) | 110(4.33) | 364(14.33) | 24.5(2.5,140) |
| #2 | yellow-1 yellow-2 | 13.0(0.512) | 110(4.33) | 370(14.57) | 24.5(2.5,140) |
| #3 | white-1 white-2 | 13.0(0.512) | 110(4.33) | 376(14.80) | 24.5(2.5,140) |
| #4 | red-1 white-2 | 13.2(0.520) | 110(4.33) | 382(15.04) | 24.5(2.5,140) |
| #5 | red-1 white-2 | 13.2(0.520) | 111.2(4.38) | 382(15.04) | 24.5(2.5,140) |
| #6 | white-1 yellow-2 | 13.0(0.512) | 110(4.33) | 376(14.80) | 24.5(2.5,140) |
| #7 | white-1 yellow-2 | 13.2(0.520) | 110(4.33) | 376(14.80) | 24.5(2.5,140) |
| #8 | purple-1 yellow-2 | 13.8(0.543) | 110(4.33) | 336.5(13.25) | 33.0(3.36,188.2) |
| #9 | white-1 yellow-2 | 13.0(0.512) | 111.0(4.37) | 376(14.80) | 24.5(2.5,140) |
| #10 | purple-1 yellow-2 | 13.8(0.543) | 111.8(4.40) | 336.5(13.25) | 33.0(3.36,188.2) |
| #11 | green-1 yellow-2 | 13.3(0.524) | 111.3(4.38) | 388(15.28) | 24.5(2.5,140) |
| #12 | pink-1 white-2 | 13.8(0.543) | 111.8(4.40) | 341.0(13.43) | 33.0(3.36,188.2) |
| #13 | white-1 purple-1 | 13.5(0.531) | 110.0(4.33) | 317.0(12.48) | 39.2(4.0,224) |
| Spring Code / Applied Model | |||||
|---|---|---|---|---|---|
| Spring Code | Year | Model | Grade | Roof | Engine |
| #1 | 84 | 2 seater | GL | hardtop | NA |
| #1 | 84 | ALL | GL | ALL | T |
| #2 | 84 | 2 seater | GL | t-top | NA |
| #2 | 84 | 4 seater | GL | ALL | NA |
| #2 | 84 | all | GLL | ALL | T |
| #2 | 85 | all | GL | ALL | T |
| #3 | 84 | 4 seater | GLL | t-top | NA |
| #4 | 85 | 4 seater | GLL | t-top | NA |
| #4 | 85-86 | 2 seater | GLL | t-top | NA |
| #5 | 87-89 | all | GL | t-top | NA |
| #6 | 85 | all | GLL | ALL | T |
| #6 | 85-86 | all | GL | t-top | NA |
| #6 | 86 | 2 seater | GL | hardtop | NA |
| #7 | 86 | 4 seater | GLL | t-top | NA |
| #8 | 84 | 2 seater | 50th AE | t-tops | T |
| #8 | 86 | all | ALL | ALL | T |
| #9 | 87-89 | 2 seater | GL | hardtop | NA |
| #10 | 87-89 | all | GL | ALL | T |
| #11 | 87-89 | all | GLL | t-top | NA |
| #12 | 87-89 | all | GLL | ALL | T |
| #13 | 88 | 2 seater | SS | t-top | T |