LeftieBiker
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Re: Nice Efficiency Improvement

Thu May 07, 2020 2:26 pm

So the reference was to covers for the fog light 'wells'?
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bobkart
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Re: Nice Efficiency Improvement

Thu May 07, 2020 3:34 pm

Sure . . . 'empty foglight receptacles' is what I used, 'fog light wells' seems okay too. Don't know the actual term for those.
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LeftieBiker
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Re: Nice Efficiency Improvement

Thu May 07, 2020 5:25 pm

I think the correct term may be "recesses."
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2009 Vectrix VX-1 W/18 Leaf modules, & 2 lithium E-bicycles.
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bobkart
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Re: Nice Efficiency Improvement

Thu May 07, 2020 5:36 pm

Cool.

Wish I could cover them up better. Wondering if removing that backing piece at the back would help (letting air flow through instead of having to go around).
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coleafrado

Re: Nice Efficiency Improvement

Wed May 27, 2020 4:56 pm

bobkart wrote:
Fri May 01, 2020 4:00 pm
which because I reduced my battery size/weight down (via LiFePO4 battery), I replaced an over-four-pound set of parts with a ~170g setup, a weight reduction of over 10x.
Hate to say this, but saving 3 or even 30 pounds on a 3500 pound road car is not going to be remotely measurable in terms of efficiency.

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bobkart
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Re: Nice Efficiency Improvement

Wed May 27, 2020 5:46 pm

coleafrado wrote:
Wed May 27, 2020 4:56 pm
Hate to say this, but saving 3 or even 30 pounds on a 3500 pound road car is not going to be remotely measurable in terms of efficiency.
I'm well past twice that 30 pound savings (the battery alone was 15 pounds). In terms of
power/weight ratio, every 1% drop in weight equates to an 'effective' 1% increase in power.
Also, 30 pounds of that weight reduction being rotating, is typically counted as at least double.
So my ~77 pounds of weight reduction (so far, more to go) comes to more than a 2% reduction,
then doubling the rotating weight part of that gives me ~107 pounds, or right at 3%. Increasing
the power (107hp) by that gives you 110.3hp 'effective'.

I agree that efficiency improvements of that magnitude won't show up on the dash meter (not enough precision there). Nor does it affect the cost to operate to any significant degree (it's already just 2-3 cents per mile). But having 'effectively' 3% more power could be noticeable. Running a zero-to-sixty calculator using curb weight (3256) and the above weight savings yields nearly a quarter second improvement (9.787 seconds to 9.545). Adding in the driver's weight doesn't change that improvement by much (0.242 to 0.239).

Of course every vehicle owner has different priorities as to what about their car is important. So I get that not everyone cares about a quarter-second better zero-to-60 time. And keep in mind that's just one benefit of weight reduction. For sure, lighter wheels/tires help with handling (unsprung mass reduction).

Thanks for your feedback.
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coleafrado

Re: Nice Efficiency Improvement

Wed May 27, 2020 6:05 pm

The wheel weight reduction, to be clear, is a substantial improvement in efficiency :)

HerdingElectrons
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Re: Nice Efficiency Improvement

Fri Mar 12, 2021 11:40 am

Just adding a bit of info concerning the OEM wheel weight of the 2018 SL 17" wheel. The stock wheel weighs 25.2 pounds.
2018 SL Pearl White 4.5/3.9; 5.0/4.6 with 205/65/16 tires)

09/18-01K Mi: 114.52AHr / SOH= 99.20%
04/19-10K Mi: 111.45AHr / SOH= 96.54%
11/19-20K Mi: 107.44AHr / SOH= 93.07%
12/20-33K Mi: 105.39Ahr / SOH= 91.29%
04/21-35K Mi: 104.32Ahr / SOH= 90.37%

frontrangeleaf
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Re: Nice Efficiency Improvement

Fri Mar 12, 2021 3:09 pm

Yep, I found the same number for the 2019 SL+ wheels. Bought aftermarket wheels at 20#, but not aero in any way. Saw effectively no change in net efficiency in town (suburban driving 35-55 mph, not too many stops).
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DougWantsALeaf
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Re: Nice Efficiency Improvement

Fri Mar 12, 2021 7:08 pm

I saw a Facebook poster reporting the 17" alloy wheels as weighing 41 Lbs, and online the part lists as 37 lbs.

Ev01 wheels arrive soon, reported to be 17.5 lbs. Will post pictures once tires are mounted on the S+.
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