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2004 Mazda RX-8 4-Door Coupe Manual Gear Ratios Calculator, MPH, Top Speed

 


This calculator outputs the how fast the Mazda RX-8 4-Door Coupe can go in each gear as calculated by the gear ratios, engine redline and tire size.
The ultimate top speed may be limted by the power, drag and aerodynamics of each individual car.

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Tire Size
(345/30/20)
/ -
OR
Tire Diameter
(inches)
 
Final Drive Ratio
Redline (RPM)
1st Gear
2nd Gear
3rd Gear
4th Gear
5th Gear
6th Gear
7th Gear
8th Gear

RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear 7th Gear 8th Gear
500 2.31 3.83 5.27 7.33 8.7 10.32 0 0
600 2.78 4.6 6.33 8.8 10.44 12.39 0 0
700 3.24 5.37 7.38 10.26 12.18 14.45 0 0
800 3.7 6.14 8.44 11.73 13.92 16.51 0 0
900 4.17 6.9 9.49 13.19 15.66 18.58 0 0
1000 4.63 7.67 10.55 14.66 17.4 20.64 0 0
1100 5.09 8.44 11.6 16.13 19.14 22.71 0 0
1200 5.55 9.2 12.66 17.59 20.88 24.77 0 0
1300 6.02 9.97 13.71 19.06 22.62 26.84 0 0
1400 6.48 10.74 14.77 20.53 24.36 28.9 0 0
1500 6.94 11.5 15.82 21.99 26.1 30.97 0 0
1600 7.41 12.27 16.88 23.46 27.84 33.03 0 0
1700 7.87 13.04 17.93 24.92 29.58 35.09 0 0
1800 8.33 13.81 18.98 26.39 31.32 37.16 0 0
1900 8.79 14.57 20.04 27.86 33.07 39.22 0 0
2000 9.26 15.34 21.09 29.32 34.81 41.29 0 0
2100 9.72 16.11 22.15 30.79 36.55 43.35 0 0
2200 10.18 16.87 23.2 32.25 38.29 45.42 0 0
2300 10.65 17.64 24.26 33.72 40.03 47.48 0 0
2400 11.11 18.41 25.31 35.19 41.77 49.54 0 0
2500 11.57 19.17 26.37 36.65 43.51 51.61 0 0
2600 12.03 19.94 27.42 38.12 45.25 53.67 0 0
2700 12.5 20.71 28.48 39.58 46.99 55.74 0 0
2800 12.96 21.48 29.53 41.05 48.73 57.8 0 0
2900 13.42 22.24 30.59 42.52 50.47 59.87 0 0
3000 13.89 23.01 31.64 43.98 52.21 61.93 0 0
3100 14.35 23.78 32.7 45.45 53.95 64 0 0
3200 14.81 24.54 33.75 46.92 55.69 66.06 0 0
3300 15.27 25.31 34.81 48.38 57.43 68.12 0 0
3400 15.74 26.08 35.86 49.85 59.17 70.19 0 0
3500 16.2 26.84 36.91 51.31 60.91 72.25 0 0
3600 16.66 27.61 37.97 52.78 62.65 74.32 0 0
3700 17.12 28.38 39.02 54.25 64.39 76.38 0 0
3800 17.59 29.15 40.08 55.71 66.13 78.45 0 0
3900 18.05 29.91 41.13 57.18 67.87 80.51 0 0
4000 18.51 30.68 42.19 58.64 69.61 82.57 0 0
4100 18.98 31.45 43.24 60.11 71.35 84.64 0 0
4200 19.44 32.21 44.3 61.58 73.09 86.7 0 0
4300 19.9 32.98 45.35 63.04 74.83 88.77 0 0
4400 20.36 33.75 46.41 64.51 76.57 90.83 0 0
4500 20.83 34.51 47.46 65.97 78.31 92.9 0 0
4600 21.29 35.28 48.52 67.44 80.05 94.96 0 0
4700 21.75 36.05 49.57 68.91 81.79 97.03 0 0
4800 22.22 36.81 50.63 70.37 83.53 99.09 0 0
4900 22.68 37.58 51.68 71.84 85.27 101.15 0 0
5000 23.14 38.35 52.74 73.31 87.01 103.22 0 0
5100 23.6 39.12 53.79 74.77 88.75 105.28 0 0
5200 24.07 39.88 54.84 76.24 90.49 107.35 0 0
5300 24.53 40.65 55.9 77.7 92.23 109.41 0 0
5400 24.99 41.42 56.95 79.17 93.97 111.48 0 0
5500 25.46 42.18 58.01 80.64 95.71 113.54 0 0
5600 25.92 42.95 59.06 82.1 97.45 115.6 0 0
5700 26.38 43.72 60.12 83.57 99.2 117.67 0 0
5800 26.84 44.48 61.17 85.03 100.94 119.73 0 0
5900 27.31 45.25 62.23 86.5 102.68 121.8 0 0
6000 27.77 46.02 63.28 87.97 104.42 123.86 0 0
6100 28.23 46.79 64.34 89.43 106.16 125.93 0 0
6200 28.7 47.55 65.39 90.9 107.9 127.99 0 0
6300 29.16 48.32 66.45 92.36 109.64 130.06 0 0
6400 29.62 49.09 67.5 93.83 111.38 132.12 0 0
6500 30.08 49.85 68.56 95.3 113.12 134.18 0 0
6600 30.55 50.62 69.61 96.76 114.86 136.25 0 0
6700 31.01 51.39 70.67 98.23 116.6 138.31 0 0
6800 31.47 52.15 71.72 99.7 118.34 140.38 0 0
6900 31.94 52.92 72.77 101.16 120.08 142.44 0 0
7000 32.4 53.69 73.83 102.63 121.82 144.51 0 0
7100 32.86 54.46 74.88 104.09 123.56 146.57 0 0
7200 33.32 55.22 75.94 105.56 125.3 148.63 0 0
7300 33.79 55.99 76.99 107.03 127.04 150.7 0 0
7400 34.25 56.76 78.05 108.49 128.78 152.76 0 0
7500 34.71 57.52 79.1 109.96 130.52 154.83 0 0
7600 35.18 58.29 80.16 111.42 132.26 156.89 0 0
7700 35.64 59.06 81.21 112.89 134 158.96 0 0
7800 36.1 59.82 82.27 114.36 135.74 161.02 0 0
7900 36.56 60.59 83.32 115.82 137.48 163.09 0 0
8000 37.03 61.36 84.38 117.29 139.22 165.15 0 0
8100 37.49 62.12 85.43 118.75 140.96 167.21 0 0
8200 37.95 62.89 86.49 120.22 142.7 169.28 0 0
8300 38.42 63.66 87.54 121.69 144.44 171.34 0 0
8400 38.88 64.43 88.6 123.15 146.18 173.41 0 0
8500 39.34 65.19 89.65 124.62 147.92 175.47 0 0
8600 39.8 65.96 90.7 126.09 149.66 177.54 0 0
8700 40.27 66.73 91.76 127.55 151.4 179.6 0 0
8800 40.73 67.49 92.81 129.02 153.14 181.66 0 0
8900 41.19 68.26 93.87 130.48 154.88 183.73 0 0
9000 41.66 69.03 94.92 131.95 156.62 185.79 0 0
9100 42.12 69.79 95.98 133.42 158.36 187.86 0 0
9200 42.58 70.56 97.03 134.88 160.1 189.92 0 0
9300 43.04 71.33 98.09 136.35 161.84 191.99 0 0
9400 43.51 72.1 99.14 137.81 163.59 194.05 0 0
9500 43.97 72.86 100.2 139.28 165.33 196.12 0 0
RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear 7th Gear 8th Gear





Some additional information on how these are calculated:

When D is the diameter of the tire, the car moves forward a distance πD with each revolution of the tire. If there are F revolutions per unit of time, it moves forward at a speed of πD´F per unit of time. If D is in inches and F is in revolutions per minute (rpm), the above result will be in inches per minute. There are 63,360 inches in a mile and 60 minutes in an hour, so one inch per minute equals 60/63360 miles per hour or 1/1056 mph. So we have the following formula:

V(mph) = D(in) ´ F(rpm) ´ (π/1056)

In the automotive industry, the coefficient 1056/π is usually taken to be equal to 336 (exactly it is 336.1352398...) and the formula corresponding to the above is:

(mph)(gear ratio)(336) = (tire diameter in inches)(rpm)

With the above numerical approximation, both formulas are identical if we consider that (rpm)/(gear ratio) is the rate of rotation of the tires. So the "gear ratio" as the number of rotations of the driveshaft for each turn of the tire. This ratio is normally more than 1, except in overdrive gear. So, calling R the "gear ratio", your final answer is:

V(mph) = D(in) ´ F(rpm) ´ (π/1056) / R

or, approximately: V = (D ´ F) / (336 ´ R)

where V is the velocity (in mph), D the tire diameter (in inches), F the engine rpm, and R the gear ratio.

 


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