[piotrsko]

Originally Posted by E4mula

I've run some tests like that. Constant speed over the same course through different gears. Average power consumption over the course increased when shifting into higher gears.

new question: which gear made you faster through the course and can you give some data as to watts per ET?

[chansen]

I calcualted that for my transmission ratio, final drive and tire size the following RPMs for the Warp9 motor:

http://www.kabamus.com/garage/gears.html

in 2nd and at 45 mph => 5000RPM
in 3rd and at 45 mph => 3500RPM

So it seems that 3rd is the right gear for everyday driving, given the Warp9 info from a previous poster. My problem is that in 3rd, the acceleration from stop is slower than other vehicles on the road. I live in hilly area so I often stop on an incline.

[roflwaffle]

Originally Posted by Bowser330

I think his setup is for 120V. The graph you reference is for 72V.

Does the voltage make a difference what rpm range is most efficienct?

I don't think it changes it much, but I'm a layperson so take that with a grain of salt barring verification.

[frk2]

Ive done tests in my car from my home to office trip (8km). I would drive in third from stop on one trip and then 2nd-3rd (shifting). The 1rst option (3rd all the way) consumes marginally more energy (maybe 10% more), gives me far better acceleration and is all round pleasant. 2nd to 3rd actually results in bad acceleration for me since my 2nd gear is REALLY high (3.1:1) with a final 3.6 ratio so 10:1 gear to the wheels.

I simply drive in third.

[Bowser330]

Originally Posted by frk2

Ive done tests in my car from my home to office trip (8km). I would drive in third from stop on one trip and then 2nd-3rd (shifting). The 1rst option (3rd all the way) consumes marginally more energy (maybe 10% more), gives me far better acceleration and is all round pleasant. 2nd to 3rd actually results in bad acceleration for me since my 2nd gear is REALLY high (3.1:1) with a final 3.6 ratio so 10:1 gear to the wheels.

I simply drive in third.

So to clarify, the 2 to 3 shift option results in bad acceleration because the shift required takes more time than just leaving it in 3rd and flooring it...even though the lower gear (higher multiplication) gives you better INITIAL acceleration, the requirement of the shift bogs down the overall acceleration...do i understand that right?

[frk2]

Originally Posted by Bowser330

So to clarify, the 2 to 3 shift option results in bad acceleration because the shift required takes more time than just leaving it in 3rd and flooring it...even though the lower gear (higher multiplication) gives you better INITIAL acceleration, the requirement of the shift bogs down the overall acceleration...do i understand that right?

Sorry for being vague - yes the shift bogs me down. Also although my VERY initial acceleration in 2nd is good - the power quickly tapers off as the motor enters high revs. This means that I have to quickly shift to third (this is due to my car's weird gearing). Overall its better if im driving in the lower (3rd) gear. Keep in mind that my 3rd may very well be your second - max speed in second = 35kmph and in 3rd = 65kmph.