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Author Topic: BMW now looking into electric turbos  (Read 5193 times)

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Offline Voodoochikin04

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BMW now looking into electric turbos
« on: November 05, 2011, 03:48:15 PM »
i thought there was a huge discussion here about the rediculousness of the electric turbo concept.. or was that a different forum??



http://www.foxnews.com/leisure/2011/11/04/bmw-reportedly-developing-electricturbochargers/
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Online fabr

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Re: BMW now looking into electric turbos
« Reply #1 on: November 05, 2011, 04:39:37 PM »
That couldn't have come at a better time for a discussion in another forum. I HAD to pass it on. Thanks Voo.
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Offline dsrace

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Re: BMW now looking into electric turbos
« Reply #2 on: November 05, 2011, 06:15:12 PM »
it will be interesting to see it unfold.
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trans man

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Re: BMW now looking into electric turbos
« Reply #3 on: November 05, 2011, 10:54:52 PM »
Electric turbos? thumb down thumb down thumb down

 That defeats the whole thing about exhaust driven turbos in general. They make free horsepower!
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Online fabr

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Re: BMW now looking into electric turbos
« Reply #4 on: November 05, 2011, 11:20:13 PM »
I'm not so sure,maybe it's actually a good idea.
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Offline BDKW1

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Re: BMW now looking into electric turbos
« Reply #5 on: November 06, 2011, 10:54:28 AM »
Quote from: trans man on November 05, 2011, 10:54:52 PM
Electric turbos? thumb down thumb down thumb down

 That defeats the whole thing about exhaust driven turbos in general. They make free horsepower!

There is no such thing as free power. It takes a lot of HP to drive a turbo.
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Offline Engineer

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Re: BMW now looking into electric turbos
« Reply #6 on: November 06, 2011, 11:51:24 AM »
Quote from: masterfabr on November 05, 2011, 11:20:13 PM
I'm not so sure,maybe it's actually a good idea.

Power on demand?

flip a switch instead of going to all the work of depressing the loud pedal.
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Offline Carlriddle

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Re: BMW now looking into electric turbos
« Reply #7 on: November 06, 2011, 12:17:13 PM »
 ff: gg: ff:


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Online fabr

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Re: BMW now looking into electric turbos
« Reply #8 on: November 06, 2011, 04:05:59 PM »
When you guys stop laughing you might consider the thinking behind the concept. ;) ;) ;D ;D ;D
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Re: BMW now looking into electric turbos
« Reply #9 on: November 06, 2011, 04:07:24 PM »
Quote from: BDKW1 on November 06, 2011, 10:54:28 AM
There is no such thing as free power. It takes a lot of HP to drive a turbo.
I don't agree. Why do you say they do?
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trans man

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Re: BMW now looking into electric turbos
« Reply #10 on: November 06, 2011, 05:29:57 PM »
Quote from: BDKW1 on November 06, 2011, 10:54:28 AM
It takes a lot of HP to drive a turbo.
??? How if we there talking about a belt driven charger I would agree. But a turbo is driven by exhaust gases and HEAT. So it's as free as free can get! ;D ;D ;D
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Offline Nutz4sand

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Re: BMW now looking into electric turbos
« Reply #11 on: November 06, 2011, 08:36:56 PM »
Turbo power AINT free. Thats a myth started by someone a long time ago who did not know what they were talking about.

You DO NOT get something for nothing and Turboes require the exhaust gases being pushed by the pistons to spin it and they ARE connected to the crank and thus DO DRAG DOWN POWER OFF THE CRANK. 

There are no two ways about it. It DOES take a lot of power to compress the air intake at the volume required to make boost at the CFM the engines is moving thru it.

ANYTHING that compresses air takes a lot of power and something that compreses a LOT of air at a pressure (even if it is less than 20psi of boost (5 psi or 10 psi for example)) it takes a lot of power.

If the pistons were not there to push the exhaust gases out then the turboes vanes on the exhaust side would have nothing pushing on them.

Turboes aint free horsepower. Those pistons pushing on that exhaust thru those vanes create more drag that the crank does indeed see.   

 
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Online fabr

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Re: BMW now looking into electric turbos
« Reply #12 on: November 06, 2011, 08:47:26 PM »
That's not quite right.
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Offline Nutz4sand

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Re: BMW now looking into electric turbos
« Reply #13 on: November 06, 2011, 08:48:55 PM »
Quote from: masterfabr on November 06, 2011, 08:47:26 PM
That's not quite right.

Actually I believe it is. Please elaborate more.
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Offline BDKW1

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Re: BMW now looking into electric turbos
« Reply #14 on: November 07, 2011, 12:11:52 AM »
Depending on how efficient your turbo is, your exhuast pressures will be anywhere from a couple of pounds higher than your boost pressure to almost double on a poor system. It robs a great deal of power on the exhaust stroke to push all that exhaust out at pressure to spin the turbo. The added intake volume produces enough power to offset these losses and give you a little extra. The upside is your friction losses aren't as high as a mechanicaly driven super charger. Where the heat and maintianing it comes into play is the extra volume of the exhaust gases.
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