Join Date: May 2009
Location: America's Auto Heartland
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Google "boy racer syndrome"; you might find someone you know well...
That's certainly an interesting concept of gearing and mathematics you have there. Makes one wonder why manufacturers have bothered to offer a plethora of ratios between 2.xx and 4.xx over the last hundred years. You do understand that for a given rev, top speed goes down as diff ratios go up, right? And isn't the real issue in this scenario, torque and not horsepower? And isn't maximum torque most often developed in the low to middle rev range?
And that old canard about "it loves to rev", the battle cry of adolescent fantasies, deep pockets, and frequent rebuilds (see, "boy racer", above). True, some engines tolerate that kind of abuse better than others, but none "love" it. Have you never wondered why racing engines of various stripes see very frequent rebuilds? Those mechanics must not be as smart as you about such things, eh?
I especially liked the part about how low revs are bad for the bearings; a novel notion indeed. As is the comparison of V-8s (all possessed of second and third order harmonics issues) and straight sixes, which have the best first, second, and third order harmonics of any cylinder configuration (save V-12s, of course). This fact just might explain why the recent rebuild of my Z's 200k mi, low rev engine revealed a crank, rods, cam, and valves and guides that were all still within "Std." specs. and provided over 60lb. of oil pressure.
Mileage? There's that old math bugaboo again; the direct relationship between revs and mileage seems to be well understood by any expert one could name. Hint: the lower the revs per mile, the better the mileage. You can look it up.
I admit that you lost me with the anecdotes about long trips; are you saying that one can only do such things with numerically high diff ratios and screaming engines, or that you enjoy driving irresponsibly in adverse conditions? I wonder, over 15K mi., do you think flooring it to road speed saved you much time in the process, or did it just make you feel fast?
And the Jetta thing.... very witty, I'm sure. Actually, around town, my usual shift point is around 2.5k rpm; city streets are no place for grownups to play "racer".
So I hope you'll see why I might think you missed the point of this intellectual exercise. My point is that if one gets his jollys from zooming around city streets, scaring old ladies and endangering kids, I s'pose short diffs are just the thing (of course, "pointless" comes in to play here, as most any econobox or faketruck today will outrun most any 20 or 30 yr. old car). But if you like road trips and love your car, there is no substitute for "legs" on the open highway.
Again, its an issue of personal taste, but its been my experience that real Road Warriors love tall diffs, tall tires, and overdrives (Leycock de Normanville forever... those Brits are a clever lot).
Just another $.04 from the peanut gallery...
Keep 'em flying...