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Westfield SEiGHT Build

Diff Ratios Tyre/Wheel dimensions   Engine Performance
DR1 3.14 WD 23.86 Width 225 Weight 650  
DR2 3.36 WC 74.98 Profile 50 Power 200 4750
        Size 15 Torque 318.8 2600
Gear Ratios   MPH/T   5800 5800
GR FR1 FR2 1 2 MAX 1 MAX 2
R380 1st 3.692 11.59 12.41 6.13 5.72 35.53 33.20
2nd 2.132 6.69 7.16 10.61 9.91 61.52 57.49
3rd 1.397 4.39 4.69 16.19 15.13 93.89 87.74
4th 1.000 3.14 3.36 22.61 21.13 131.16 122.57
5th 0.770 2.42 2.59 29.37 27.45 170.34 159.18
LT77 1st 3.321 10.43 11.16 6.81 6.36 39.49 36.91
2nd 2.087 6.55 7.01 10.84 10.13 62.85 58.73
3rd 1.396 4.38 4.69 16.20 15.14 93.95 87.80
4th 1.000 3.14 3.36 22.61 21.13 131.16 122.57
5th 0.792 2.49 2.66 28.55 26.68 165.60 154.76
T5 1st 2.950 9.26 9.91 7.67 7.16 44.46 41.55
2nd 1.940 6.09 6.52 11.66 10.89 67.61 63.18
3rd 1.340 4.21 4.50 16.88 15.77 97.88 91.47
4th 1.000 3.14 3.36 22.61 21.13 131.16 122.57
5th 0.630 1.98 2.12 35.89 33.54 208.19 194.56
FR1 1500 2000 2500 3000 3500 4000 4500 5000 5800
R380 1st 9.19 12.25 15.31 18.38 21.44 24.50 27.56 30.63 35.53
2nd 15.91 21.21 26.52 31.82 37.12 42.43 47.73 53.03 61.52
3rd 24.28 32.37 40.47 48.56 56.66 64.75 72.84 80.94 93.89
4th 33.92 45.23 56.53 67.84 79.15 90.45 101.76 113.07 131.16
5th 44.05 58.74 73.42 88.10 102.79 117.47 132.16 146.84 170.34
LT77 1st 10.21 13.62 17.02 20.43 23.83 27.24 30.64 34.05 39.49
2nd 16.25 21.67 27.09 32.51 37.92 43.34 48.76 54.18 62.85
3rd 24.30 32.40 40.50 48.60 56.70 64.80 72.89 80.99 93.95
4th 33.92 45.23 56.53 67.84 79.15 90.45 101.76 113.07 131.16
5th 42.83 57.11 71.38 85.66 99.93 114.21 128.49 142.76 165.60
T5 1st 11.50 15.33 19.16 23.00 26.83 30.66 34.50 38.33 44.46
2nd 17.48 23.31 29.14 34.97 40.80 46.63 52.45 58.28 67.61
3rd 25.31 33.75 42.19 50.63 59.07 67.50 75.94 84.38 97.88
4th 33.92 45.23 56.53 67.84 79.15 90.45 101.76 113.07 131.16
5th 53.84 71.79 89.74 107.68 125.63 143.58 161.53 179.47 208.19
Key            
DR Differential Ratio  
WD Tyre Diameter as calculated  
WC Tyre Circumference as calculated  
Width Tyre Wdth  
Profile Tyre profile  
Size Tyre size in inches  
GR Gear ratio  
FR Final ratio as calculated  
MPH/T Mile per hour per thousand revs as calculated  
MAX Maximum Speed in Gear as calculated  

Download the excel spreadsheet here

After I went to the extent of working all this out for myself I discovered that Quaife have produced a computer program which can do all the calculations, this can be obtained here

Last updated August 15, 2006 | About me |Contact me | ©2005 Adam Reeves