vwcorvette (Forum Supporter) said:This thread makes me happy. And I never saw anything north of 60 mpg while I owned it. Good job!
Thanks! i think the drivers behind me might have a different expletive, but I was grinning.
Not close enough to you, but posting for inspiration (FB listing):
rslifkin said:Curtis73 (Forum Supporter) said:In reply to DeadSkunk (Warren) :
That's a great idea, but I've never seen an upsized wheel/tire combo that didn't increase the moment of inertia. The only real way to make that change a net wash is if regenerative braking is as efficient as propulsion, which I assume is far from reality.
I'd expect that outside of closesly spaced traffic lights or other low speed scenarios with lots of acceleration and braking, rolling resistance and even wheel face aerodynamics (at least at highway speed) will be a bigger factor than the inertia of the wheel and tire combo.
How smooth are the roads? Lighter wheels are easier for the suspension to control, which means less heat in the shock oil, and that heat ultimately comes from the gasoline in the tank.
I noted that running my bourge-mobile's driver adjustable dampers to the softest setting was worth a few mpg.
When you are trying to find miniscule gains, every little bit counts, but also every little bit hurts.
From a purely hybrid drive scenario, any rotating mass that takes effort to spin up will also take effort to slow down, and this effort is used to charge the battery, so it should be a wash aside from efficiency losses.
In reply to Pete. (l33t FS) :
That's a good point, especially on a fairly light car, lighter wheels will ride better. But bigger wheel / lower profile tire may not be significantly heavier overall, but the weight will almost certainly be further out on the combo (so more rotating inertia even if total weight to impact suspension performance isn't much different).
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