Bay Area Miata Drivers
Return to the BAMD Miatas page BAMD Miata Performance Calculator
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Use this form to see how changes might affect your Miata's performance, for example a reduction in weight. Plug in your torque numbers (or select torque specs for a given year/model), plus your Miata's weight and tire size, then click the Calculate button. We hope this form is easy enough to figure out, but if you have any questions about it, email the BAMD webmaster.

Miata weight (lbs): A base NA weighs 2150 lbs. A base NB weighs 2300. Add weight for the driver, fuel, oil, and accessories.
Tire size (in): Typical diameter for a 185/60-14 tire is 22.9. Get your tire diameter from an online source like tirerack.com.
Drag coefficient: Combined number for all drag forces, typical for a top-down Miata. The number for a hardtop would be lower.
Differential ratio: 4.3 was standard for 1990-1993 and 1999-2003 (5-speed) models. 4.1 was standard for 1994-1997 and 2004 on.
Gear Ratios: 1: 2: 3: 4: 5: 6: Shift RPMs:
Torque Specs: Use torque specs for:  
RPMs
2000
2500
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4200
4400
4600
4800
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Torque
Current Results
0-60:  
40-70:  
1/4 mile:  
Top speed: