Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Turning an alternator into a motor (while still being an alternator)

bestclimb · 05-16-2013, 05:03 PM

so at what, 50 hp for a 3 cyl metro add 2 (optimistically) and you now have 52 hp to accelerate with.

stock:
1376 lbs and 50 hp= 27.52 lbs/hp
a 0-60 of 13 seconds

with 2! extra hp:
it's 1376 and 52hp= 26.46 lbs/hp
a guess of 12.5sec 0-60 at a very optimistic gain.(13/27.52=.472=12.49) This is a very very best case situation, as a car heavier than a metro, or more powerful than a metro (IE just about any other car on the road) will have less performance change due to higher weight and higher horsepower premod, also 2hp is extremely generous. If using a lower gas power setting for acceleration 2 extra hp would help a little more. How long would the belt/belts last getting subject to near their maximum holding power (both for the discharge and recharge)

To recharge after the acceleration the alt would be drawing more power (putting more load on the engine and reducing cruise MPG till the battery is topped off)? If so the maths that I would do before even investigating how to go about doing it is to figure out if the fuel saved during acceleration is more than the increased fuel used during cruise.

If regen braking is to be wired in will decelerating with engine braking and the alternator recharging near it's max be capable of getting back the energy spent or would it still be better to just coast down?

Most hybrid systems that have been successful deliver over 10% of the max available power, they are also capable of regenerating that power quickly. The insight for example with a 67 hp engine has a 13hp electric motor(nearly 20%)

05-16-2013, 05:03 PM	#16 (permalink)
bestclimb Smeghead Join Date: Oct 2009 Location: South Central AK Posts: 933 escort - '99 ford escort sport 90 day: 42.38 mpg (US) scoobaru - '02 Subaru Forester s 90 day: 28.65 mpg (US) Thanks: 32 Thanked 146 Times in 97 Posts	so at what, 50 hp for a 3 cyl metro add 2 (optimistically) and you now have 52 hp to accelerate with. stock: 1376 lbs and 50 hp= 27.52 lbs/hp a 0-60 of 13 seconds with 2! extra hp: it's 1376 and 52hp= 26.46 lbs/hp a guess of 12.5sec 0-60 at a very optimistic gain.(13/27.52=.472=12.49) This is a very very best case situation, as a car heavier than a metro, or more powerful than a metro (IE just about any other car on the road) will have less performance change due to higher weight and higher horsepower premod, also 2hp is extremely generous. If using a lower gas power setting for acceleration 2 extra hp would help a little more. How long would the belt/belts last getting subject to near their maximum holding power (both for the discharge and recharge) To recharge after the acceleration the alt would be drawing more power (putting more load on the engine and reducing cruise MPG till the battery is topped off)? If so the maths that I would do before even investigating how to go about doing it is to figure out if the fuel saved during acceleration is more than the increased fuel used during cruise. If regen braking is to be wired in will decelerating with engine braking and the alternator recharging near it's max be capable of getting back the energy spent or would it still be better to just coast down? Most hybrid systems that have been successful deliver over 10% of the max available power, they are also capable of regenerating that power quickly. The insight for example with a 67 hp engine has a 13hp electric motor(nearly 20%) __________________ Learn from the mistakes of others, that way when you mess up you can do so in new and interesting ways. One mile of road will take you one mile, one mile of runway can take you around the world.