Z31 Factory Shock Specifications
These are Nissan's specs for the original Z31 front struts and rear shocks: tube and rod size, stroke, and damping force. They're handy for comparing replacement shocks, or for working out which factory parts were used on which car.
Turbo cars came with electronically adjustable shocks, so they have a damping figure for each setting (firm, medium and soft). Damping forces are given as newtons / kilograms / pounds; dimensions as millimeters / inches.
Front Struts
| Spec | 1984-1986 Non-Turbo | 1987-1989 Non-Turbo | 1984-1986 Turbo | 1987-1989 Turbo | 1988 SS |
|---|---|---|---|---|---|
| Size | |||||
| Inner diameter (mm / in) | 32.0-32.1 / 1.260-1.264 | 32.0-32.1 / 1.260-1.264 | 35.0-35.1 / 1.378-1.382 | 35.0-35.1 / 1.378-1.382 | 32.0-32.1 / 1.260-1.264 |
| Rod diameter (mm / in) | 22.0 / 0.87 | 22.0 / 0.87 | 25.0 / 0.98 | 25.0 / 0.98 | 22.0 / 0.87 |
| Stroke maximum (mm / in) | 191.8 / 7.551 | 189.8-193.8 / 7.47-7.63 | 191.8 / 7.551 | 189.8-193.8 / 7.47-7.63 | 191.8 / 7.55 |
| Stroke minimum (mm / in) | 31.8 / 1.252 | 39.5 / 1.555 | 31.8 / 1.252 | 39.5 / 1.555 | 39.5 / 1.555 |
| Expansion (rebound) damping, N / kg / lb | |||||
| Firm | 981 / 100 / 221 | 834-1128 / 85-115 / 187-254 | 1510 / 154 / 340 | 1579-2148 / 161-219 / 355-483 | 1775-2344 / 181-239 / 399-527 |
| Medium | — | — | 1226 / 125 / 276 | — | — |
| Soft | — | — | 530 / 54 / 119 | 1324-1775 / 135-181 / 298-399 | — |
| Compression damping, N / kg / lb | |||||
| Firm | 441 / 45 / 99 | 363-520 / 37-53 / 82-117 | 785 / 80 / 176 | 834-1128 / 85-115 / 187-254 | 804-1157 / 82-118 / 181-260 |
| Medium | — | — | 637 / 65 / 143 | — | — |
| Soft | — | — | 255 / 26 / 57 | 657-912 / 67-93 / 148-205 | — |
Non-turbo and SS struts have a single fixed setting, listed under Firm.
Rear Shocks
| Spec | 1984-1989 Non-Turbo | 1984-1986 Turbo | 1987-1989 Turbo | 1988 SS |
|---|---|---|---|---|
| Size | ||||
| Inner diameter (mm / in) | 25-25.1 / 0.984-0.988 | 32-32.1 / 1.260-1.264 | 32-32.1 / 1.260-1.264 | 25-25.1 / 0.984-0.988 |
| Rod diameter (mm / in) | 12.5 / 0.492 | 22.0 / 0.87 | 22.0 / 0.87 | 12.5 / 0.492 |
| Stroke maximum (mm / in) | 609.3 / 23.99 | 601.3 / 23.67 | 599.3 / 23.59 | 599.3 / 23.59 |
| Stroke minimum (mm / in) | 392.5 / 15.45 | 384.5 / 15.14 | 384.5 / 15.14 | 392.5 / 15.45 |
| Expansion (rebound) damping, N / kg / lb | ||||
| Firm | 588 / 60 / 132 | 785 / 80 / 176 | 794-1069 / 81-109 / 179-240 | 1117 / 120 / 265 |
| Medium | — | 637 / 65 / 143 | 549-725 / 56-74 / 123-163 | — |
| Soft | — | 422 / 43 / 95 | 363-481 / 37-49 / 82-108 | — |
| Compression damping, N / kg / lb | ||||
| Firm | 294 / 30 / 66 | 588 / 60 / 132 | 481-637 / 49-65 / 108-143 | 510 / 52 / 115 |
| Medium | — | 441 / 45 / 99 | 382-500 / 39-51 / 86-112 | — |
| Soft | — | 186 / 19 / 42 | 157-216 / 16-22 / 35-49 | — |
Non-turbo and SS shocks have a single fixed setting, listed under Firm.
Related
Sources Used
- 1984-1989 Nissan Factory Service Manual
- Compiled by: Paul Hillman (AZ-ZBUM)