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inferno red wk 02-09-2012 09:06 PM

True electric turbo
so i work with hi powered mini electric motors for my work i was toying with the idea of making a true electric turbo and see what comes of it it seems doable with the right parts and developement time im open any input as to what people think

FlyinRyan 02-09-2012 09:10 PM

Re: True electric turbo

inferno red wk 02-09-2012 09:12 PM

Re: True electric turbo
im going to ask why no

Chaoul1 02-09-2012 09:27 PM

Re: True electric turbo
No again.

Escape 02-09-2012 11:13 PM

Re: True electric turbo
Can you get it to spin at 100k-200k+ rpm's and compress enough air to actually pressurize the intake manifold?

I think the size of the motor and the power to run it would make it a no-go.

inferno red wk 02-10-2012 03:03 PM

Re: True electric turbo
yes its possible to get it to spin that fast with the proper amount of torque needed the only issue i see with it is the step up inverter needs to be well placed to turn the 12 volts to the 220 for the motor im thinkin of nut there doesnt seam to be any interist so ill drop it

mosier 02-10-2012 05:08 PM

Re: True electric turbo
A long time ago there was a site called Thomas McKnight Turbos that went into detail about this. I have wanted to do this for years, being as how I work in the automotive industry. For reasons waaaay to long to type into this post, I’ll give the short and sweet. The biggest reason now that it still is not worth the time is the “scale of economics” in the whole process vs. rate of return. Meaning, the amount of electrical enginery required to run a subtle compressor to move enough air at a high enough pressure with sufficient volume, while keeping abaitic efficiency on a good level, plus all the heavy cabling, coupled with really needing two dual rectifier fielded high output alternators, then the associated weight gain with this whole set-up makes it a poor choice in overall terms of efficiency. McKnights best set-up used three special wound electric motors wired (I don’t remember if in series or parallel) in place of the nose cone on a refurbed Eaton blower to make 6psi at the cost of being able only to run it 15-20 seconds at a time then taking upwards of an hour or so to let the batteries recharge by the engine driven alternator for another shot. He experimented with a robust enough electrical system to operate it at full boost as long as you wanted, but the motors would burn out due to thermal overload. Also that particular system was so massive that it required filling most of the trunk with Dyno Batts and running aforementioned dual alternators, which cost some horsepower just to turn, so that had to figured into the equation. The total weight of the system was well above a simple nitrous kit, would gave similar, although more reliable and repeatable gains in power. What it amounts to really, at this point in accessible technology is electric nitrous, if you will. Instead of using a gas and adding fuel to it, you are essentially using compressed air that is electronically generated, then adding fuel. Both give more available oxygen to be burned with added fuel, which equals more power, but the Nitrous is still more efficient in terms of packaging, weight and cost. This is the short version based off my own research. I am in no way claiming to be an expert or anything like that in this field.

TJcust 02-10-2012 05:16 PM

Re: True electric turbo
Tie off of the TPS wires to a PWM cicuit then to a motor control circuit powering a small hi powered motor - i would also install an override switch to put to full spin. Not saying it would be worth while, but thats how I would design it. Might be good for pre-charging an airbox or something but i don't think it would provide much pressure.

SilverWK07 02-10-2012 05:34 PM

Re: True electric turbo
I recently saw an article about BMW working on a similar theory. It sounded like they were going to use the electric motor turbo(s) to help get the exhaust driven one up to speed quicker and reduce turbo lag.

A quick google search turned up this

wkearney99 02-10-2012 06:21 PM

Re: True electric turbo
Yeah, it's one thing to consume the wattage to accomplish a momentary goal like helping spin it up. Hard to argue whether it's worthwhile, it's certainly not going to be worth it for a daily driver. The cost and weight of adding it would price it out of realistic use in production. And folks that pretend to know about economies of scale... don't.

As for replacing the exhaust driven kind entirely, that's just not gonna happen as it's against the law.... of thermodynamics. The amount of energy necessary to spin it and keep it compressing the air isn't trivial. It's far less inefficient to use the fuel burned in the engine to spin it, rather than deal with charging and discharging batteries to spin an electric motor.

mosier 02-10-2012 06:59 PM

Re: True electric turbo
Soory, it is Thomas Knight. Not McKnight. It's been so long since I looked into this stuff. Here is the link that was also posted two years ago in the Electric Supercharger thread started by Omlet.

mosier 02-10-2012 07:01 PM

Re: True electric turbo
Started by AcidCold. Damn, I need to lay off the booze or something......

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