voltamps wrote: ↑
Thu May 13, 2021 7:43 am
I get 3,9 miles per kwh on my '20 SV, so 1/3.9
= 0.256 kwh/mile === 256 wh/mile typically.
Without any air resistance (air drag), that figure would probably be around 7 miles per kwh, so let's use 7.
So 1/7 = 143 wh/mile
Energy savings per mile would be 1% of 143 wh/mile ==== 1.43 wh/mile === 0.00143 kwh/mile
Or you could just say I'd get 150 miles from my 40 kwh battery using Nissan Matic S, and that increases to 151 miles on Valvoline ULV thinner oil. Much of the Road Load (power required to drive on level ground with no headwind or tailwind) is from basic air drag, so something around 1 mile advantage in range is the net effect, depending on driving style, city or hiway.
Thanks for posting that, it puts everything into perspective. Is there any additional energy saving when cooling the gear oil is mixed in? I mean, all of them (oils) are designed to provide low viscosity at high(er) temperatures. If you have something that is cooling the gear oil to keep it at a certain temperature versus the heat generated by the friction within the system (gears, oil, etc.)?
If anyone has every noticed that on a warm day, you plug in your Leaf to charge. After a while, you hear the cooling pump running. If the coolant is warm enough, you can even hear the fans kick on. All of that uses energy, not sure how much, haven't measured.
Now, if on a warm day. Say you have a nice stretch of highway to just dump the throttle and go 0 to 100 mph non-stop. During that intense acceleration (for a Leaf anyway), if you listen carefully, during some part of that acceleration, you will hear the radiator fans kicks in, loud at high speed. I had to tape a cheap phone to the inside of my Leaf to find out
because during high power usage, it always sounded like another system of motors was kicking in, now I know what it was. So it is possible to really heat up the motor (and gear box too I would guess).
It would seem that the gear box oil, using ULV, as many others have said, in theory, doesn't really gain much (1% extra range by itself). That's why I have a theory that, looked at alone, the ULV isn't producing huge range gains, very small as you can demonstrate by the math. But... it might be part of an avalanche effect within another system of the Leaf (cooling system) that uses a lot more power and thus keeps the temperature just low enough that this more power hungry system doesn't have to switch on (as much) and that's where the extra range savings is coming from. Both in hotter climates because of cooling and cold climates because of heat needed to reach a good viscosity for the oil to function.