Friday, July 2, 2010

Transmission Comparisons

Some are curious about gearing ratios, torque capacity and differences among various transmissions/transaxles used in many of today’s performance cars. So here here is a list that I may add on to later:

Transmission Tq. Cap. (ft. lb.) 1st 2nd 3rd 4th 5th 6th
Tremec T-56 Magnum (2.66 1st) 700 2.66 1.78 1.30 1.00 0.80 0.63
Tremec T-56 Magnum (2.97 1st) 700 2.97 2.10 1.46 1.00 0.74 0.50
Tremec T-56 Viper-spec 750 2.66 1.78 1.30 1.00 0.74 0.50
Tremec T-56 Viper-spec (taller 5th and 6th) 750 2.66 1.78 1.30 1.00 0.80 0.62
Getrag 6MTI500/MT82   3.66 2.43 1.69 1.32 1.00 0.65
Ford 6R80 (Automatic) 800 4.17 2.34 1.52 1.14 0.87 0.69
Tremec T-5 300 2.95 1.94 1.34 1.00 0.63 NA
Ricardo 6-speed Transaxle (Ford GT) 500 2.61 1.71 1.23 0.94 0.77 0.63
Tremec TKO 600 600 2.87 1.89 1.28 1.00 0.64 NA
Tremec TKO 500 500 3.27 1.98 1.34 1.00 0.68 NA
Tremec TR-6060 600 2.97 1.78 1.30 1.00 0.80 0.63
ZF 6HP26 326 4.17 2.34 1.52 1.14 0.87 0.69
ZF 6HP28 444 4.17 2.34 1.52 1.14 0.87 0.69

Also, it is worth nothing that the actual gear ratios employed in a particular vehicle application may change per manufacturer choice. The typical reason may be the engine setup and target fuel economy per vehicle class. For example, to help get fuel economy ratings down within regulation, a manufacturer may select taller gears, especially in the case of the last 2 gears. The same is true for final drive gear ratio.

Below are a several example tire and gearing setups showing MPH to RPM.

Tire Dia.: 26.13
1st Gear Ratio: 2.97
Final Gear Ratio: 3.73

Engine
Speed
(RPM)

Wheel
Speed
(MPH)

8000

56.14

7500

52.63

7000

49.12

6500

45.61

6000

42.10

5500

38.59

5000

35.09

4500

31.58

4000

28.07

3500

24.56

3000

21.05

2500

17.54

2000

14.03

1500

10.53

1000

7.02

Tire Dia.: 26.13
1st Gear Ratio: 3.66
Final Gear Ratio: 3.73

Engine
Speed
(RPM)

Wheel
Speed
(MPH)

8000

45.55

7500

42.71

7000

39.86

6500

37.01

6000

34.17

5500

31.32

5000

28.47

4500

25.62

4000

22.78

3500

19.93

3000

17.08

2500

14.24

2000

11.39

1500

8.54

1000

5.69

Tire Dia.: 28.0
1st Gear Ratio: 3.66
Final Gear Ratio: 3.73

Engine
Speed
(RPM)

Wheel
Speed
(MPH)

8000

48.81

7500

45.76

7000

42.71

6500

39.66

6000

36.61

5500

33.56

5000

30.51

4500

27.46

4000

24.41

3500

21.36

3000

18.31

2500

15.25

2000

12.20

1500

9.15

1000

6.10

Tire Dia.: 28.0
1st Gear Ratio: 2.61
Final Gear Ratio: 3.73

Engine
Speed
(RPM)

Wheel
Speed
(MPH)

8000

68.45

7500

64.17

7000

59.90

6500

55.62

6000

51.34

5500

47.06

5000

42.78

4500

38.50

4000

34.23

3500

29.95

3000

25.67

2500

21.39

2000

17.11

1500

12.83

1000

8.56

Tire Dia.: 28.0
1st Gear Ratio: 2.66
Final Gear Ratio: 3.73

Engine
Speed
(RPM)

Wheel
Speed
(MPH)

8000

67.17

7500

62.97

7000

58.77

6500

54.57

6000

50.37

5500

46.18

5000

41.98

4500

37.78

4000

33.58

3500

29.38

3000

25.19

2500

20.99

2000

16.79

1500

12.59

1000

8.40

Tire Dia.: 28.0
1st Gear Ratio: 2.97
Final Gear Ratio: 3.73

Engine
Speed
(RPM)

Wheel
Speed
(MPH)

8000

55.86

7500

52.37

7000

48.88

6500

45.38

6000

41.89

5500

38.40

5000

34.91

4500

31.42

4000

27.93

3500

24.44

3000

20.95

2500

17.46

2000

13.96

1500

10.47

1000

6.98

Tire Dia.: 28.0
1st Gear Ratio: 2.66
Final Gear Ratio: 4.10

Engine
Speed
(RPM)

Wheel
Speed
(MPH)

8000

56.74

7500

53.19

7000

49.65

6500

46.10

6000

42.55

5500

39.01

5000

35.46

4500

31.92

4000

28.37

3500

24.82

3000

21.28

2500

17.73

2000

14.18

1500

10.64

1000

7.09

Tire Dia.: 28.0
1st Gear Ratio: 2.66
Final Gear Ratio: 3.55

Engine
Speed
(RPM)

Wheel
Speed
(MPH)

8000

65.53

7500

61.43

7000

57.34

6500

53.24

6000

49.15

5500

45.05

5000

40.96

4500

36.86

4000

32.77

3500

28.67

3000

24.57

2500

20.48

2000

16.38

1500

12.29

1000

8.19

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