18-05-2021, 08:07 AM
I went for a run out in my RP yesterday and thought about the original post. With a 5.25 diff, which is standard in the saloons, a true 45mph is very close to what was originally quoted as the car's maximum speed, ie 48mph. The ideal cruising speed is between 40 and 45mph where the engine is quite happy, but only turning at about 3000rpm. Personally I think it would be better just to leave things as they are and wear some ear plugs. It's an easier option. Those of us that do lots of miles in our cars don't have a problem with the gearing. Changing to a 4.9 rear train in a heavy Ruby is likely to render top gear pretty damn near useless.