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Gear Ratio Calculator >>

2013 Dodge Viper GTS 6 speed manual Gear Ratios Calculator, MPH, Top Speed

 


This calculator outputs the how fast the Dodge Viper GTS 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 5.08 7.26 9.64 11.48 14.9 18.21 0 0
600 6.09 8.72 11.57 13.77 17.88 21.86 0 0
700 7.11 10.17 13.5 16.07 20.86 25.5 0 0
800 8.12 11.62 15.43 18.36 23.84 29.14 0 0
900 9.14 13.07 17.36 20.66 26.82 32.79 0 0
1000 10.15 14.53 19.29 22.95 29.81 36.43 0 0
1100 11.17 15.98 21.21 25.25 32.79 40.07 0 0
1200 12.19 17.43 23.14 27.54 35.77 43.71 0 0
1300 13.2 18.88 25.07 29.84 38.75 47.36 0 0
1400 14.22 20.34 27 32.13 41.73 51 0 0
1500 15.23 21.79 28.93 34.43 44.71 54.64 0 0
1600 16.25 23.24 30.86 36.72 47.69 58.29 0 0
1700 17.26 24.69 32.79 39.02 50.67 61.93 0 0
1800 18.28 26.15 34.71 41.31 53.65 65.57 0 0
1900 19.29 27.6 36.64 43.61 56.63 69.21 0 0
2000 20.31 29.05 38.57 45.9 59.61 72.86 0 0
2100 21.33 30.5 40.5 48.2 62.59 76.5 0 0
2200 22.34 31.96 42.43 50.49 65.57 80.14 0 0
2300 23.36 33.41 44.36 52.79 68.55 83.79 0 0
2400 24.37 34.86 46.29 55.08 71.53 87.43 0 0
2500 25.39 36.31 48.21 57.38 74.51 91.07 0 0
2600 26.4 37.77 50.14 59.67 77.49 94.71 0 0
2700 27.42 39.22 52.07 61.97 80.47 98.36 0 0
2800 28.43 40.67 54 64.26 83.45 102 0 0
2900 29.45 42.12 55.93 66.56 86.44 105.64 0 0
3000 30.46 43.58 57.86 68.85 89.42 109.29 0 0
3100 31.48 45.03 59.79 71.15 92.4 112.93 0 0
3200 32.5 46.48 61.71 73.44 95.38 116.57 0 0
3300 33.51 47.93 63.64 75.74 98.36 120.21 0 0
3400 34.53 49.39 65.57 78.03 101.34 123.86 0 0
3500 35.54 50.84 67.5 80.33 104.32 127.5 0 0
3600 36.56 52.29 69.43 82.62 107.3 131.14 0 0
3700 37.57 53.74 71.36 84.92 110.28 134.79 0 0
3800 38.59 55.2 73.29 87.21 113.26 138.43 0 0
3900 39.6 56.65 75.21 89.51 116.24 142.07 0 0
4000 40.62 58.1 77.14 91.8 119.22 145.71 0 0
4100 41.64 59.55 79.07 94.1 122.2 149.36 0 0
4200 42.65 61.01 81 96.39 125.18 153 0 0
4300 43.67 62.46 82.93 98.69 128.16 156.64 0 0
4400 44.68 63.91 84.86 100.98 131.14 160.29 0 0
4500 45.7 65.36 86.79 103.28 134.12 163.93 0 0
4600 46.71 66.82 88.71 105.57 137.1 167.57 0 0
4700 47.73 68.27 90.64 107.87 140.08 171.21 0 0
4800 48.74 69.72 92.57 110.16 143.07 174.86 0 0
4900 49.76 71.17 94.5 112.46 146.05 178.5 0 0
5000 50.77 72.63 96.43 114.75 149.03 182.14 0 0
5100 51.79 74.08 98.36 117.05 152.01 185.79 0 0
5200 52.81 75.53 100.29 119.34 154.99 189.43 0 0
5300 53.82 76.98 102.21 121.64 157.97 193.07 0 0
5400 54.84 78.44 104.14 123.93 160.95 196.71 0 0
5500 55.85 79.89 106.07 126.23 163.93 200.36 0 0
5600 56.87 81.34 108 128.52 166.91 204 0 0
5700 57.88 82.79 109.93 130.82 169.89 207.64 0 0
5800 58.9 84.25 111.86 133.11 172.87 211.29 0 0
5900 59.91 85.7 113.79 135.41 175.85 214.93 0 0
6000 60.93 87.15 115.71 137.7 178.83 218.57 0 0
6100 61.94 88.6 117.64 140 181.81 222.21 0 0
6200 62.96 90.06 119.57 142.29 184.79 225.86 0 0
6300 63.98 91.51 121.5 144.59 187.77 229.5 0 0
6400 64.99 92.96 123.43 146.88 190.75 233.14 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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