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Old 08-09-2019, 12:39 PM   #31 (permalink)
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Quote:
Originally Posted by Taylor95 View Post
I would say the mpg increase would be closer to 50-75% depending on the vehicle. These wheels add 100 hp, which is very significant when you consider that most engines make around 160-180 hp at the crank. That would end up being like 125 or so hp to the wheels. Your engine would have to work half as hard to maintain 60 mph. What if your mpg increased to say 110 mpg? Then would it be worth it?
Are we talking about an F150? If you have all of the numbers, you can use this to calculate how many horsepower your car needs: https://ecomodder.com/forum/tool-aer...resistance.php

I could not find all of the numbers for an F-150, so I am just quoting this:
Quote:
Originally Posted by darcane View Post
Power required to overcome aerodynamic drag is proportional to velocity cubed. If you know how much power is needed at a specific speed to overcome aero drag, you can figure it out at other speeds.

If it takes 12hp to keep your car going at 60mph on level ground (assume 10hp for aero, 2hp for rolling resistance) you'll need 24hp at 80mph and 46hp at 100 just to overcome aero drag.

Rolling resistance is directly proportional to velocity, so it would be about 26hp and 50hp total, respectively.
https://ecomodder.com/forum/showthre...tml#post376742

I do not know for what weight vehicle the 12 HP figure would be accurate, but let's take my 1,075 kg and 115-pound HX, remove the back seat, drop in a 540 kg Tesla battery, and now I have a 1,615 kg 225 HP 2-seater that needs a suspension upgrade.

Now I need 18 HP at 60 MPH and... what is the point of a car like this? To need to fill up and charge, which I really do not think you would want to do at the same time?

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Old 08-09-2019, 06:47 PM   #32 (permalink)
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Quote:
Originally Posted by Xist View Post
Are we talking about an F150? If you have all of the numbers, you can use this to calculate how many horsepower your car needs: https://ecomodder.com/forum/tool-aer...resistance.php

I could not find all of the numbers for an F-150, so I am just quoting this:
https://ecomodder.com/forum/showthre...tml#post376742

I do not know for what weight vehicle the 12 HP figure would be accurate, but let's take my 1,075 kg and 115-pound HX, remove the back seat, drop in a 540 kg Tesla battery, and now I have a 1,615 kg 225 HP 2-seater that needs a suspension upgrade.

Now I need 18 HP at 60 MPH and... what is the point of a car like this? To need to fill up and charge, which I really do not think you would want to do at the same time?
Does this system need to be charged? If so, that takes away most of the value I placed on Orbis. I thought it would be like a regular hybrid. I haven't come across anything that said it needs to be charged.

I actually have a Silverado in mind, which is pretty similar in terms of weight and cd. It would be used for towing occasionally as well as being a daily. Having the orbis wheels would be great on this--as long as charging is not a requirement.

In my experience, increasing horsepower will increase mpg as long as you don't drive the vehicle aggressively in most applications.
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Old 08-09-2019, 07:08 PM   #33 (permalink)
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Originally Posted by Taylor95 View Post
Does this system need to be charged? ...
They were never very direct about that, even though they talk about EV only operation. Since they have sold some rights to something like a venture capital firm, rather than continuing to market, I think we can see where they were finessing their reporting to the public. They also gave the impression that it could work seamlessly as AWD with the existing throttle and such but never explained the motor controller or throttling in any detail. We'll see if it ever really comes to market now. They musta just gotten quite a payday.
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Old 08-09-2019, 07:47 PM   #34 (permalink)
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It needs to be powered somehow. If they developed a Mr. Fusion that is a much bigger deal than this.
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Old 08-09-2019, 07:51 PM   #35 (permalink)
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Quote:
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... Mr. Fusion ...
lol
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Old 08-09-2019, 11:47 PM   #36 (permalink)
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Why can't the engine charge the batteries? Isn't that how a prius works?
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Old 08-09-2019, 11:53 PM   #37 (permalink)
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Quote:
The Prius HSD has two motor-generators, call MG1 and MG2. MG1 is smallish and used to spin the ICE and to transfer power from the ICE to MG2. MG2 is larger and is used as a prime mover and for regenerative braking. Both MG1 and MG2 are sometimes used as electric motors, and sometimes as generators. The electricity generated from MG1 and MG2 is either used to move the car or charge the HV (traction) battery. The small 12V battery, which is like the battery on a "normal" car, is charged from the HV battery by means of a DC to DC converter, which steps down the high voltage to that of the 12V battery. The DC to DC converter also supplies the 12V accessory needs when the Prius is in run mode (lights, radio, MFD, etc.).
https://priuschat.com/threads/altern...9/#post-558162

A standard alternator would be absolutely inadequate. If Orbis Wheels worked, they should be able to provide regenerative braking, but you would need a far more powerful alternator to charge the battery the rest of the time, and the Toyota system uses the "alternators" as motors, too.

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