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Gear Ratio Calculator >>

2009 Dodge Viper ACR 6 speed manual Gear Ratios Calculator, MPH, Top Speed

 


This calculator outputs the how fast the Dodge Viper ACR 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 4.95 7.23 10.12 13.15 17.75 26.31 0 0
600 5.93 8.67 12.14 15.79 21.3 31.57 0 0
700 6.92 10.12 14.17 18.42 24.85 36.83 0 0
800 7.91 11.56 16.19 21.05 28.4 42.1 0 0
900 8.9 13.01 18.21 23.68 31.95 47.36 0 0
1000 9.89 14.46 20.24 26.31 35.51 52.62 0 0
1100 10.88 15.9 22.26 28.94 39.06 57.88 0 0
1200 11.87 17.35 24.29 31.57 42.61 63.14 0 0
1300 12.86 18.79 26.31 34.2 46.16 68.4 0 0
1400 13.85 20.24 28.33 36.83 49.71 73.67 0 0
1500 14.84 21.68 30.36 39.46 53.26 78.93 0 0
1600 15.83 23.13 32.38 42.1 56.81 84.19 0 0
1700 16.81 24.57 34.4 44.73 60.36 89.45 0 0
1800 17.8 26.02 36.43 47.36 63.91 94.71 0 0
1900 18.79 27.47 38.45 49.99 67.46 99.98 0 0
2000 19.78 28.91 40.48 52.62 71.01 105.24 0 0
2100 20.77 30.36 42.5 55.25 74.56 110.5 0 0
2200 21.76 31.8 44.52 57.88 78.11 115.76 0 0
2300 22.75 33.25 46.55 60.51 81.66 121.02 0 0
2400 23.74 34.69 48.57 63.14 85.21 126.29 0 0
2500 24.73 36.14 50.6 65.77 88.76 131.55 0 0
2600 25.72 37.58 52.62 68.4 92.31 136.81 0 0
2700 26.71 39.03 54.64 71.04 95.86 142.07 0 0
2800 27.69 40.48 56.67 73.67 99.41 147.33 0 0
2900 28.68 41.92 58.69 76.3 102.97 152.59 0 0
3000 29.67 43.37 60.71 78.93 106.52 157.86 0 0
3100 30.66 44.81 62.74 81.56 110.07 163.12 0 0
3200 31.65 46.26 64.76 84.19 113.62 168.38 0 0
3300 32.64 47.7 66.79 86.82 117.17 173.64 0 0
3400 33.63 49.15 68.81 89.45 120.72 178.9 0 0
3500 34.62 50.6 70.83 92.08 124.27 184.17 0 0
3600 35.61 52.04 72.86 94.71 127.82 189.43 0 0
3700 36.6 53.49 74.88 97.34 131.37 194.69 0 0
3800 37.58 54.93 76.9 99.98 134.92 199.95 0 0
3900 38.57 56.38 78.93 102.61 138.47 205.21 0 0
4000 39.56 57.82 80.95 105.24 142.02 210.48 0 0
4100 40.55 59.27 82.98 107.87 145.57 215.74 0 0
4200 41.54 60.71 85 110.5 149.12 221 0 0
4300 42.53 62.16 87.02 113.13 152.67 226.26 0 0
4400 43.52 63.61 89.05 115.76 156.22 231.52 0 0
4500 44.51 65.05 91.07 118.39 159.77 236.78 0 0
4600 45.5 66.5 93.09 121.02 163.32 242.05 0 0
4700 46.49 67.94 95.12 123.65 166.87 247.31 0 0
4800 47.48 69.39 97.14 126.29 170.43 252.57 0 0
4900 48.46 70.83 99.17 128.92 173.98 257.83 0 0
5000 49.45 72.28 101.19 131.55 177.53 263.09 0 0
5100 50.44 73.72 103.21 134.18 181.08 268.36 0 0
5200 51.43 75.17 105.24 136.81 184.63 273.62 0 0
5300 52.42 76.62 107.26 139.44 188.18 278.88 0 0
5400 53.41 78.06 109.29 142.07 191.73 284.14 0 0
5500 54.4 79.51 111.31 144.7 195.28 289.4 0 0
5600 55.39 80.95 113.33 147.33 198.83 294.67 0 0
5700 56.38 82.4 115.36 149.96 202.38 299.93 0 0
5800 57.37 83.84 117.38 152.59 205.93 305.19 0 0
5900 58.36 85.29 119.4 155.23 209.48 310.45 0 0
6000 59.34 86.73 121.43 157.86 213.03 315.71 0 0
6100 60.33 88.18 123.45 160.49 216.58 320.97 0 0
6200 61.32 89.63 125.48 163.12 220.13 326.24 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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