My Elan gives exactly the same consumption at this speed, yet improves to over 42mpg when cruising about 10-15kph less. The Elan is doing 3900rpm (3.9 diff) at 110- a bit different to the 1700 of the modern car.
I used to have a MGA Coupe 1600 and I had a 3.9 diff in it which gave almost 20 mph per thousand revs (15inch wheels) rather than the 4.3 diff as normal. It also had a close ratio gearbox with a very tall 1st gear - YET - getting off the line from say a set of lights was no more difficult with the 3.9 as it was with the 4.3. Oh and the MGA had a 3/4 race engine so it didn't have a lot of torque down low.
Guess what I am saying is that in a light car like the Elan, when used for the road, the diff ratios we run say 3.9, 3.7 etc ... then we are paying a penalty in making the engine rev a lot higher than it needs to. Sure we can go the 5 speed box route, but the standard Elan box is a delightful gearbox and the gearshift is just in the right place.
Now what if we were to drop the 3900 rpm at 110kph down to 3000 - sure would make legal cruising a lot less busy and a lot less noisey.
So I am contemplating have a 3.0 crownwheel and pinion made to investigate what this does to the driveablity of the car.
Would appreciate any comments ...
Please don't comment here - comment on main Elan forum please - posted here in error
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