Electric Supercharger

[TeeAreDeaGeeTeeEss]

I posted this before, but does anyone have any thoughts regarding it? Anyone test it out yet?
I wonder what the gains would be with a little customized cutting into a CAI and slapping on the electric filter.


http://www.electricsupercharger.com/

Watch the video.

Instant 1PSI!!!

[t2000gts]

byebyebaby dynoed it, it was a bust. no gains.

[fastwhipyo]

whats goin on with your car TRDGTS? Im guessing the sig is a joke right? cause a 435HP celica better be doin better than 12's, thats better HP to weight ratio than a GSXR 1000 sportbike, haha.

[deceptikon047]

yeah pretty much a joke... just check out the link on his sig

[TeeAreDeaGeeTeeEss]

Originally posted by fastwhipyo
whats goin on with your car TRDGTS? Im guessing the sig is a joke right? cause a 435HP celica better be doin better than 12's, thats better HP to weight ratio than a GSXR 1000 sportbike, haha.

I have traction problems :gap:

[komar]

Originally posted by TeeAreDeaGeeTeeEss


I have traction problems :gap:

i love it when ppl ask b4 they look at the dyno slip. it got me the first time i saw it.

Kareem

[scapamouche]

I wouldn't bother.

I had one on my old Sentra many moons ago. I will admit, it was worth about a second in the 1/4. The second that I lost by installing it.

It might have worked if I'd beefed up the electrical system, and installed a bypass for when it was idling, but not worth it.

It's :gay:

[celicauk]

About the only way to do an electric supercharger is to get a normal high geared type (like the rotrex), and attach it to an electric motor, the motor could then be controlled by a small computer which would read engine RPM and drive the motor via a PWM in direct relation to the engine revs.

BTW - This is theoretical, I have never seen it done, nor have I ever seen it suggested. Technically it should work like a charm as superchargers are driven in direct relation to the engine revs. Also chargers like the rotrex don't require a lot of power to spin them up. An electric motor to run at the top RPM an engine can produce should also be no problem. The circuitry to drive the motor would also be straight forward.

Hmm, actually this might not be a bad idea, anyone fancy a joint venture?

[DJ_GLITCH_OS]

I had the exact same idea celicauk. :)

[celicauk]

Perhaps we ought to give it a go.

Mines fully mechanical, anyone want a supercharger? I can do the electronic controls easily enough and source a motor, anyone got a spare supercharger?

[scapamouche]

I've got the rinkdink POS that's attached to my electric sitting on a shelf. I don't see it working.

As for not needing much power, I think you guys are a bit off there. It takes power to generate boost. It may be easy to spool that thing up to speed, but it will still take plenty of juice to get boost out of it.
Someone did some calculations a few months ago- I think they came up with about 1KW to generate 6 psi boost. At 12 volts, thats 85 amps. Not a trivial load. My useless ES/C drew 60 amps steady state, and didn't even make the advertised 4psi, I suspect.

[celicauk]

I think that will depend on the charger type. With the rotrex it doesn't take a lot to get it going and its a mechanical link so once its going its boosting.

It would be interesting to bench test this though, could be an expensive experiment!

Cheers

[t2000gts]

go for it, then dyno it, then sell it :D

[scapamouche]

Unfortunately, there's a lot more to it than that.

As an example, the Supercharger on a Top fuel dragster allows its 500 cu in (8.5L) V8 to make 6000 horsepower. To drive the S/C, to allow that, takes 1000 additional horsepower!! The engine actually makes over 7000, but the parasitic losses of the blower suck up that much.

In a much smaller scale, the same applies to any S/C or turbo. It takes a lot of energy to make boost. You cannot just spin it up and let it go. It takes constant energy input to keep that boost up, otherwise the engine will continue to suck air, and will suck faster than the S/C is compressing it, at which time the boost goes away.

Even if the rotrex has gear reduction to allow a smaller, low torque motor to run the compressor, it still takes the same enegy input to get a given level of boost at a given engine speed on a give engine. Either a small, fast motor with lots of gear reduction, or a mechanical link to the crank with less (but still some) reduction, is needed and the power to compress that air charge to the same pressure is THE SAME. (plus any other losses associated with the mechanical links and friction.)

[byebyebaby]

I dynoed it. The airflow was there, but the computer did not adjust the fuel to go with it. Thus no gains.
This thing in theory can work if the ECU would add extra fuel at WOT. ( WOT is the only time the blower turns on)

[ProToolsKid]

That looks Ghey

[DJ_GLITCH_OS]

couldnt you use a S-AFC to help fix the problem??
and just change the curve for an e-charger??

[byebyebaby]

Could have used the AFC to get some gains but did not want to shell out another 300+ bones.

[celicauk]

Actually I was taking the piss a bit :)

I still reckon it would be interesting to rig it up on the bench and see what happens but given physics and all that (i.e. you don't get something for nothing) I seriously doubt it would actually work.

On the point about the 7000bhp engine, firstly **** me thats a lot of power :), secondly we aren't looking at generating anything like that, it must be one huge SC to give out that much pressure so it is not surprising it takes up so much energy to keep it going, a little one producing say 1 bar boost isn't going to take anything like that much power up.

It would be a bit of a laugh to have a go, although there is no way I am going to delay fitting my SC just so I can try it out ;)

[scapamouche]

If you've ever seen a top fuel dragster or funny car, the big round edged box on top of the engine, with the huge pulley is the blower itself. I'm not completely sure, but I think the 14-71 designated blowers used (originally for semi diesels, BTW) are about 300 or 400 cuin (5 to 6.4 L) in displacement. They are overdriven to produce something on the order of 50 psi of boost (3.5 bar) on a 500 cu in engine at 9000 rpm. That is a HUGE amount of air!!! Especially since that style of blower DOES NOT actually COMPRESS the air!!! It only pumps air; so much air that that pressure builds up in the intake downstream!!

Even 1 bar of boost is going to take a BIG electric motor, especially with 1.8 L of engine displacement spinning over 8000 rpm. Remember,boost is a function of blower design, speed, engine displacement and air capacity of the blower. There's a real good chance that the compressor with most of these electric S/Cs is too small to support your engine.

The turbopac kit I have was originally recommended for up to 5.0L. After they actually sold some, proof to the contrary forced them to downrate the recommended engine displacement to 2.0L. A bit of a change, don't you think? I doubt it had the capacity to actually pump the advertised 4 psi (.3bar) on the 2.0L SR20DE engine I had mine mounted on ('92 Sentra SE-R.) much less anything more strenuous.