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Old 05-31-2018, 12:43 PM   #21 (permalink)
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This will get you to work in a hurry...


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Old 05-31-2018, 01:22 PM   #22 (permalink)
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Sadly, I live more than 1/4 mile from work...
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Transmission type Efficiency
Manual neutral engine off.100% @MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%

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Old 05-31-2018, 01:35 PM   #23 (permalink)
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Quote:
Originally Posted by Ecky View Post
My understanding is that the island of efficiency is more like ~75% rather than 30-50%.
Yeah, usually around 75% of peak torque, but about 35% of peak power. You'd want an aero car that at 100 MPH is producing 35% of peak power. I base that off of the BSFC chart I studied to understand how they work:



This assumes most of the driving done is at this speed. No sense optimizing the car to that speed if it's only occasional.

Really though, I'd probably get a used EV as a commuter and a nice ICE for longer trips. EVs are efficient at most any speed, and excel when stuck in traffic.
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Old 05-31-2018, 02:47 PM   #24 (permalink)
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This is way too complicated! I will just keep under 100 KPH!
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Old 05-31-2018, 04:07 PM   #25 (permalink)
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Quote:
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This is way too complicated! I will just keep under 100 KPH!
There are online calculators where you can enter the vehicle Cd and frontal area, and it will calculate HP required for a given speed. Find a car with an efficient aero shape, and then plug the numbers in to find the required HP. The amount of power needed at the target speed should be 35% of max horsepower, and the gearing should be such that the horsepower is achieved at 75% of peak torque.

Yes, fairly complicated.

EVs operate between 85-95% efficiency throughout the range, so they are good for just about any speed or operating condition.
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Old 05-31-2018, 05:45 PM   #26 (permalink)
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Sadly, I live more than 1/4 mile from work...
That's ok, how long does it take to coast down from 300mph?
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Old 05-31-2018, 06:38 PM   #27 (permalink)
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Quote:
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Sadly, I live more than 1/4 mile from work...
That is good. Otherwise you would pass at 300 MPH.

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That's ok, how long does it take to coast down from 300mph?
I think I can coast a mile from 60 MPH. Two miles from 120 and three miles from 240?
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Old 05-31-2018, 07:47 PM   #28 (permalink)
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I'd start with a Prius, and boat tail it. I've only had mine up to 85, but it was surprisingly smooth at that speed.
Here's a video of a 2007 at 108 MPH
and here's a prius at 195 KPH
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Old 05-31-2018, 08:05 PM   #29 (permalink)
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I find my Prius (and most cars) over-report speed by about 3%. Still, the fine for doing 105 MPH in a construction zone wouldn't be pretty.

The Prius is an excellent choice given the great aero, and variable gear ratio which will keep the car in the most efficient RPM and load range for the given power demand.
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Old 05-31-2018, 09:10 PM   #30 (permalink)
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