My Gear Ratios and Calculation
This demostrates the Speed in each gear for a given RPM
The RPM after changing up from a given RPM (8000rpm max for my car)
The Amount of RPM drop.
SPcomponents Semi Helical Gearbox with CR500 205/50/13
| Diff Ratio | 3.92 | Revs/Mile | 925 | ||
| RPM | 1st | 2nd | 3rd | 4th | 5th |
| GearRatio | 2.36 | 1.54 | 1.21 | 1 | 0.87 |
| Overall Ratio | 9.251 | 6.037 | 4.743 | 3.920 | 3.410 |
| Ratio gaps | 0.82 | 0.33 | 0.21 | 0.13 | |
| 1000 | 7.0mph | 10.7mph | 13.7mph | 16.5mph | 19.0mph |
| 1500 | 10.5 | 16.1 | 20.5 | 24.8 | 28.5 |
| 2000 | 14.0 | 21.5 | 27.4 | 33.1 | 38.0 |
| 2500 | 17.5 | 26.9 | 34.2 | 41.4 | 47.5 |
| 3000 | 21.0 | 32.2 | 41.0 | 49.6 | 57.1 |
| 3500 | 24.5 | 37.6 | 47.9 | 57.9 | 66.6 |
| 4000 | 28.0 | 43.0 | 54.7 | 66.2 | 76.1 |
| 4500 | 31.6 | 48.4 | 61.5 | 74.5 | 85.6 |
| 5000 | 35.1 | 53.7 | 68.4 | 82.7 | 95.1 |
| 5500 | 38.6 | 59.1 | 75.2 | 91.0 | 104.6 |
| 6000 | 42.1 | 64.5 | 82.1 | 99.3 | 114.1 |
| 6500 | 45.6 | 69.8 | 88.9 | 107.6 | 123.6 |
| 7000 | 49.1 | 75.2 | 95.7 | 115.8 | 133.1 |
| 7500 | 52.6 | 80.6 | 102.6 | 124.1 | 142.6 |
| 8000 | 56.1 | 86.0 | 109.4 | 132.4 | 152.2 |
| 8500 | 59.6 | 91.3 | 116.2 | 140.7 | 161.7 |
| 9000 | 63.1 | 96.7 | 123.1 | 148.9 | 171.2 |
| Change up | 1st - 2nd | 2nd -3rd | 3rd - 4th | 4th -5th | |
| 3000 | 1958rpm | 2357rpm | 2479rpm | 2610rpm | |
| 3500 | 2284 | 2750 | 2893 | 3045 | |
| 4000 | 2610 | 3143 | 3306 | 3480 | |
| 4500 | 2936 | 3536 | 3719 | 3915 | |
| 5000 | 3263 | 3929 | 4132 | 4350 | |
| 5500 | 3589 | 4321 | 4545 | 4785 | |
| 6000 | 3915 | 4714 | 4959 | 5220 | |
| 6500 | 4242 | 5107 | 5372 | 5655 | |
| 7000 | 4568 | 5500 | 5785 | 6090 | |
| 7500 | 4894 | 5893 | 6198 | 6525 | |
| 8000 | 5220 | 6286 | 6612 | 6960 | |
| 8500 | 5547 | 6679 | 7025 | 7395 | |
| 9000 | 5873 | 7071 | 7438 | 7830 | |
| RPM Drop | 1st - 2nd | 2nd -3rd | 3rd - 4th | 4th -5th | |
| 3000 | 1042rpm | 643rpm | 521rpm | 390rpm | |
| 3500 | 1216 | 750 | 607 | 455 | |
| 4000 | 1390 | 857 | 694 | 520 | |
| 4500 | 1564 | 964 | 781 | 585 | |
| 5000 | 1737 | 1071 | 868 | 650 | |
| 5500 | 1911 | 1179 | 955 | 715 | |
| 6000 | 2085 | 1286 | 1041 | 780 | |
| 6500 | 2258 | 1393 | 1128 | 845 | |
| 7000 | 2432 | 1500 | 1215 | 910 | |
| 7500 | 2606 | 1607 | 1302 | 975 | |
| 8000 | 2780 | 1714 | 1388 | 1040 | |
| 8500 | 2953 | 1821 | 1475 | 1105 | |
| 9000 | 3127 | 1929 | 1562 | 1170 |