final drive

Is it easy to fit a Uno Turbo final drive?

Not particularly easy but it can be done if you have a bottom change UT box available. You will have to put the X1/9 driven gears, synchros etc. on to the UT output shaft.

If the change is for better ratios then in my experience the difference isn't worth the effort. If it's to handle the power of a turbo then the standard box will cope happily (assuming it's not already worn). I run 180hp and haven't come to grief yet :pinch:

ok thanks, the reason i asked because i heard it considerably reduces the rpm at around 70mph

The final drive ratio of the Uno turbo is 3.58 compared to 4.077 for the X19. It would give the following ratios when coupled to the standard X19 gears (format of the table doesn't line up but the last figure is the approx. speed at 6.5k rpm)

Gear G Ratio Overall 6.5k rpm speed
1 3.583 12.82714 77.95970107 4.911461167 32
2 2.235 8.0013 124.9796908 7.87372052 51
3 1.469 5.25902 190.1494955 11.97941822 78
4 1.043 3.73394 267.8136231 16.87225826 110
5 0.863 3.08954 323.6727798 20.39138513 133
Final Dr 3.58

This is the same table for the standard set up:
Gear G Ratio Overall
1 3.583 14.607891 68.45615154 4.312737547 28
2 2.235 9.112095 109.7442465 6.913887531 45
3 1.454 5.927958 168.6921534 10.62760566 69
4 1.042 4.248234 235.3919299 14.82969158 96
5 0.863 3.518451 284.2159803 17.90560676 116
Final Dr 4.077