Hi Goldie.
Have you decided on what diff ratio you are using?
Here are some speed/rev figures for 4th gear per 1000 rpm.
2.88:1.........................................27 mph
3.058:1 or 3.07:1.........................25 mph
3.31:1.........................................23 mph
3.54:1.........................................22 mph
The last two sets of figures are fine for high reving 4 pot engines but at 70 mph you could do with getting your revs down as low as possible (The nearer to 2000 rpm the better) for cruising down the M way.
At 70 mph you will be reving at:-
2.88 diff .......................2600 rpm
3.058/3.07diff................2770 rpm
3.31 diff........................3000 rpm
3.54 diff........................3200 rpm
These figures are based on tyre sizes:-
255/45/17
but are close to:-
295/35/18,
245/50/16,
235/60/15, (I'm not sure what size AK use)
Sorry if I'm telling you something you already know but I'm bored.
