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2004 Porsche Carrera GT 6 speed manual Gear Ratios Calculator, MPH, Top Speed

 


This calculator outputs the how fast the Porsche Carrera GT 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 2.92 5 6.88 8.74 10.39 12.47 0 0
600 3.51 6 8.25 10.49 12.47 14.96 0 0
700 4.09 7 9.63 12.24 14.55 17.46 0 0
800 4.68 8 11 13.98 16.63 19.95 0 0
900 5.26 9 12.38 15.73 18.7 22.44 0 0
1000 5.84 10 13.75 17.48 20.78 24.94 0 0
1100 6.43 11 15.13 19.23 22.86 27.43 0 0
1200 7.01 12 16.5 20.98 24.94 29.93 0 0
1300 7.6 13 17.88 22.72 27.02 32.42 0 0
1400 8.18 14 19.25 24.47 29.09 34.91 0 0
1500 8.77 15 20.63 26.22 31.17 37.41 0 0
1600 9.35 16 22 27.97 33.25 39.9 0 0
1700 9.94 17 23.38 29.72 35.33 42.39 0 0
1800 10.52 18 24.75 31.46 37.41 44.89 0 0
1900 11.11 19 26.13 33.21 39.48 47.38 0 0
2000 11.69 20 27.5 34.96 41.56 49.88 0 0
2100 12.27 21 28.88 36.71 43.64 52.37 0 0
2200 12.86 22 30.26 38.46 45.72 54.86 0 0
2300 13.44 23 31.63 40.2 47.8 57.36 0 0
2400 14.03 24 33.01 41.95 49.88 59.85 0 0
2500 14.61 25 34.38 43.7 51.95 62.34 0 0
2600 15.2 26 35.76 45.45 54.03 64.84 0 0
2700 15.78 27 37.13 47.19 56.11 67.33 0 0
2800 16.37 28 38.51 48.94 58.19 69.83 0 0
2900 16.95 29 39.88 50.69 60.27 72.32 0 0
3000 17.53 30.01 41.26 52.44 62.34 74.81 0 0
3100 18.12 31.01 42.63 54.19 64.42 77.31 0 0
3200 18.7 32.01 44.01 55.93 66.5 79.8 0 0
3300 19.29 33.01 45.38 57.68 68.58 82.29 0 0
3400 19.87 34.01 46.76 59.43 70.66 84.79 0 0
3500 20.46 35.01 48.13 61.18 72.73 87.28 0 0
3600 21.04 36.01 49.51 62.93 74.81 89.78 0 0
3700 21.63 37.01 50.88 64.67 76.89 92.27 0 0
3800 22.21 38.01 52.26 66.42 78.97 94.76 0 0
3900 22.79 39.01 53.63 68.17 81.05 97.26 0 0
4000 23.38 40.01 55.01 69.92 83.13 99.75 0 0
4100 23.96 41.01 56.38 71.67 85.2 102.24 0 0
4200 24.55 42.01 57.76 73.41 87.28 104.74 0 0
4300 25.13 43.01 59.14 75.16 89.36 107.23 0 0
4400 25.72 44.01 60.51 76.91 91.44 109.73 0 0
4500 26.3 45.01 61.89 78.66 93.52 112.22 0 0
4600 26.89 46.01 63.26 80.41 95.59 114.71 0 0
4700 27.47 47.01 64.64 82.15 97.67 117.21 0 0
4800 28.05 48.01 66.01 83.9 99.75 119.7 0 0
4900 28.64 49.01 67.39 85.65 101.83 122.19 0 0
5000 29.22 50.01 68.76 87.4 103.91 124.69 0 0
5100 29.81 51.01 70.14 89.15 105.98 127.18 0 0
5200 30.39 52.01 71.51 90.89 108.06 129.68 0 0
5300 30.98 53.01 72.89 92.64 110.14 132.17 0 0
5400 31.56 54.01 74.26 94.39 112.22 134.66 0 0
5500 32.15 55.01 75.64 96.14 114.3 137.16 0 0
5600 32.73 56.01 77.01 97.89 116.38 139.65 0 0
5700 33.32 57.01 78.39 99.63 118.45 142.14 0 0
5800 33.9 58.01 79.76 101.38 120.53 144.64 0 0
5900 34.48 59.01 81.14 103.13 122.61 147.13 0 0
6000 35.07 60.01 82.51 104.88 124.69 149.63 0 0
6100 35.65 61.01 83.89 106.63 126.77 152.12 0 0
6200 36.24 62.01 85.26 108.37 128.84 154.61 0 0
6300 36.82 63.01 86.64 110.12 130.92 157.11 0 0
6400 37.41 64.01 88.01 111.87 133 159.6 0 0
6500 37.99 65.01 89.39 113.62 135.08 162.09 0 0
6600 38.58 66.01 90.77 115.37 137.16 164.59 0 0
6700 39.16 67.01 92.14 117.11 139.23 167.08 0 0
6800 39.74 68.01 93.52 118.86 141.31 169.58 0 0
6900 40.33 69.01 94.89 120.61 143.39 172.07 0 0
7000 40.91 70.01 96.27 122.36 145.47 174.56 0 0
7100 41.5 71.01 97.64 124.11 147.55 177.06 0 0
7200 42.08 72.01 99.02 125.85 149.63 179.55 0 0
7300 42.67 73.01 100.39 127.6 151.7 182.04 0 0
7400 43.25 74.01 101.77 129.35 153.78 184.54 0 0
7500 43.84 75.01 103.14 131.1 155.86 187.03 0 0
7600 44.42 76.01 104.52 132.85 157.94 189.53 0 0
7700 45 77.01 105.89 134.59 160.02 192.02 0 0
7800 45.59 78.01 107.27 136.34 162.09 194.51 0 0
7900 46.17 79.01 108.64 138.09 164.17 197.01 0 0
8000 46.76 80.01 110.02 139.84 166.25 199.5 0 0
8100 47.34 81.01 111.39 141.58 168.33 201.99 0 0
8200 47.93 82.01 112.77 143.33 170.41 204.49 0 0
8300 48.51 83.01 114.14 145.08 172.48 206.98 0 0
8400 49.1 84.01 115.52 146.83 174.56 209.48 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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