'66 Elan S2 26/4869
I love the sound of a torque wrench in the morning. Sounds like... progress.
- Fourth Gear
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Looking at my old SCCA Production Car Specifications, Alfa homologated 3 alternative gear sets.
2.76, 1.78, 1.30, 1.00, and 0.85 is one set. This gives a 1st to 2nd ratio drop of 55%, quite useable. Shifting at 6500 rpm brings the revs back to 4200, a noticable and useful improvement. And 6500 in 5th gives 138 mph.
Another homologated set is 2.54, 1.70, 1.26, 1.0, and 0.85. The first 4 ratios are somewhat similar to our 4 speed transmisison, with an added 5th. the 1st to 2nd ratio drop is 50%. Shifting at 6500 brings the revs back to 4400. And the potential top speed at 6500 is 133. This probably is the ratio set to use if you can find it from some Alfa specialists, although the previous set would be quite satisfactory.
The last homologated set is 2.33, 1.58, 1.21, 1., and 0.88. These are similar ratios to the Quaife T9 semi-helical rally gear set. The 1st to 2nd ratio drop is 47% and the potential top speed at 6500 is 129. However, it is probably geared too high in 1st to be a good street box, giving 49 mph in 1st gear
The above information was produced using a spreadsheet that allow easy modelling of different car parameters. It is invaluable when considering some of these possible scenarios, particularly when considering different tire sizes, diff ratios, and engine speeds. Request a copy from me by sending an email to [email protected].
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