Mazda Miata NA (1990-1997)
| Years | 1990-1997 |
|---|---|
| Trims | Single trim with option packages (A/B/C, later PEP/Leather/R package) and special editions; manual or 4-speed automatic. |
| Engine | 1990-93: 1.6L BP-ZE. 1994-97: 1.8L (about +15 hp, OBD-II from 1996, 133 hp for 1996). |
| Notes | Informally 'NA6' (1.6) vs 'NA8' (1.8). 1990 and early-1991 1.6 cars have the 'short-nose' crankshaft. Torsen LSD optional from 1994 (viscous LSD before that). |
Generation facts are drawn from: Hagerty Media (Mar 2021), Randy Stocker / SoloMiata (fixjunk.com).
Known issues (overview)
- Short-nose crankshaft (1990 and early 1991) Confirmed
- Rocker and floor rust from clogged drains Reported
- 1990-93 1.6 uses a smaller 6-inch rear differential Reported
- Cooling parts crack with age and heat Limited
- Verify timing belt and plug service history Limited
Best mods by goal
- First steps (1)
- Suspension (1)
- Wheels & tires (1)
- Drivetrain (2)
- Brakes (1)
- Power (1)
Will it fit?
| Part | Result | Years | Confidence |
|---|---|---|---|
| NB 6-speed manual transmission (with NB shifter) | Fits with extra parts or work | 1990-1997 | Confirmed |
| 1994-2005 differential, driveshaft and axles (7-inch rear) | Fits with extra parts or work | 1994-1997 | Confirmed |
| 1994-2005 flywheel with matching clutch disc and pressure plate | Fits with extra parts or work | 1990-1997 | Confirmed |
| 1999-2000 (and base 2001-02) front calipers, brackets and rotors | Fits with extra parts or work | 1990-1997 | Reported |
| NB factory wheels (4x100) | Reported to fit | 1990-1997 | Confirmed |
| NB factory hardtop | Reported to fit | 1990-1997 | Reported |
| NB convertible top frame / soft top assembly | Reported to fit | 1990-1997 | Reported |
| NB-era sway bars (with NB brackets and bushings) | Fits with extra parts or work | 1990-1997 | Reported |
| NB complete shock/spring assemblies | Fits with extra parts or work | 1990-1997 | Reported |
| 1999-2000 (NB1) ignition coil pack | Reported to fit | 1996-1997 | Reported |
| NB2 (2001-05) VVT 1.8L engine | Fits with extra parts or work | 1994-1997 | Reported |
| NB radiator | Does not fit | 1990-1997 | Reported |
| NB seats (on NB seat rails) | Fits with extra parts or work | 1990-1997 | Reported |
| 15x7 +38 wheel with 205/50R15 tire | Reported to fit | 1990-1997 | Reported |
| 15x9 +36 wheel with 225/45R15 tire | Fits with extra parts or work | 1990-1997 | Reported |
| Tein Street Basis Z coilovers | Reported to fit | 1990-1997 | Limited |
| OEM NA wheel (14x5.5 or 15x6, +45) | Specification | 1990-1997 | Reported |