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Air Filter Shootout Test - Results!

 
Old Apr 22, 2019, 09:37 AM
  #616  
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Originally Posted by MinusPrevious View Post
If i understood the Vid correctly, the problem was the 2 xtra batteries that could not support the load properly. There was a link on his Vid for E-Turbos in which they noted a Lithium Ion battery is needed & would need a separate charge aside from the alternator system
I watched the video. They use the 2 small batteries to hook up in series to get 24V to e-supercharger and have a switch to connect back to alternator at 12V to charge when e-supercharger is off. They claim it produces 5psi down low and 2 psi up top. I just don't see that happening with that tiny motor that's about the size of a windshield wiper motor.
*added:*
I watched video portion about batteries again. Those are not lithium ion batteries and I was wrong about controller connecting to charge the batteries at 12V. Controller would have to transform to 28V to charge those 2 batteries because they are fixed in series.

Last edited by 2006EvoIXer; Apr 22, 2019 at 10:07 AM.
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Old Apr 22, 2019, 09:43 AM
  #617  
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I dunno i watched a few random minutes of the vid where he is talking about the electric supercharger and I already smell B.S. He is talking about the RPM that the motor can spin the compressor at, but not how much torque is required to spin it at that speed and do the work of compressing the air. There are other things, but I didn't watch the whole vid so I'll limit my ranting. Also that little motor is a joke, this is a gimmick.
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Old Apr 22, 2019, 11:47 AM
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Electric superchargers are real, but the DIY versions are not.

Turbochargers are air compressors. The stock turbo is in the 40lb/min range, which is somewhere around 600 Cubic Feet per Minute (CFM) of air. Moving that much air at 20psi requires serious power input, which is not going to happen with a couple of batteries attached to a cheap electric motor. For an apples to oranges comparison, check the CFM rating of the air compressor in your garage. It's probably 1% of that.

BW's matchbot has a neat calculation of the turbo shaft power: http://www.turbos.bwauto.com/aftermarket/matchbot.aspx . The default values show a ~380HP engine requiring almost 50HP of turbo shaft power. 50HP is equal to 37 kilowatts of power. Take a look at how big a 40kw electric motor would have to be, then compare to the tiny motors used in these electric supercharger scam videos. Not even close.

A 40kw electric motor running on 24V would require well over 1000 amps of current, too, which is not going to happen in any amateur system.

It's all nonsense, and it usually ends in a scammy sales pitch.
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Old Apr 22, 2019, 12:16 PM
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^Well put. And I like your analogy to an air compressor. I've got a pretty decent shop air setup and yet every time I do a boost leak test Im reminded of just how impressive a turbocharger really is. How long does it take to fill the charge pipes of air? And yet think about the typical boost threshold of a turbocharger. I know its stating the obvious but they flow some serious volume even for a small little guy.
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Old Apr 22, 2019, 02:30 PM
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And that's why all car manufacturers put an electric motor to help accelerate cars. With that much electricity demand for e-supercharger, it was more efficient to connect the eletric motor directly to drivetrain. You get the power to wheels and not the smog during acceleration.
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