UNTS1

I found this website while browsing for photos of 928s http://www.electricsupercharger.com/. Its an electric driven supercharger and has been tested on 928s. The theory seems correct but is very questionable.

Im not willing to pay for an electric supercharger, but I am thinking at the moment of building one myself. Has anyone else tried this?

EDIT:
With 2 of those 1.7 psi units on a 928 producing 3.4 psi for $1000 is actually pritty good. Is this anyones car?

TheoJ

hi,
the problem you are facing is finding or building some high performance fans to build pressure and have a real good flow capacity. I think that's where I stopped There were several attemps. I think in France a company still offers a similar solution with less performance. Try google.
regards,
_______________
Theo 1992 928gts
http://jenniskens.livedsl.nl
http://928gts.jenniskens.eu

UNTS1

I am actually considering getting this as my next upgrade, because when I do get the 928 turbo kit when its released this kit should compliment it decreasing turbo lag.

chaadster

Boy, I don't think this has come up in awhile, but it sure is one that gets people worked up!

I agree the theory seems sound, but one of the issues for me with the system is that gains only come at WOT; there is no partial boost. Also, although I've never heard them running, it has been said that they make quite a bit of noise...maybe like a mad vacuum cleaner!

I'm curious to see where thoughts are on the system these days.

ceedee

i'd be interested in who had put that in his car. and whether it's still in in!

toofast928

Snake Oil for Sale>>>>>>>>>
The air box is not designed to hold air pressure. For $10000 bucks get a nice 100HO NOS kit.

123quattro

This type of stuff is complete snake oil. It's a waste of your money. Stay away. The pressure they are rated at is not at a useful (high) flow.

An Eaton M90 blower consumes about 60 hp at full boost at 6000 rpm. Say that's putting out 10 psi. Now these electric blowers are 1.7 psi? That's roughly 1/5th the output of the M90. That would be 1/5th the power required as well to compress that amount of air. So, 1/5th of 60 hp is about 9kW. A car's electrical system runs at 14 volts. So, to get 9kW at 14 volts, you will need an 650A alternator, or 7 factory ones.

Ed Hughes

It's like a perpetual motion machine...sounds great on paper, but isn't going to work in the real world, at least at a price below that of a hydrogen fuel cell.

This is probably as effective as "The Tornado" that they advertise on Two Guys Garage on Speed. When I first saw that guy Sam from the show hawking that crap, I lost all respect for the guy.

davek9

Two should work twice as good...right? ha ..ha..

Dennis Wilson

Come on guys. Check the archives before posting this type of information. Might start here.

https://rennlist.com/forums/showthre...&highlight=ram

Dennis

chaadster

IIRC, eRam is not supposed to pressurize the airbox as much as it is supposed to remove ( or prevent, however you'd say it) vacuum at WOT.

davek9

Thank you Dennis for the link.
It looks like a 5 -8 hp gain (at WOT) was proven on a dyno and the current draw was only on the battery (at WOT) which was then recharged by the alt.

mark kibort

Its nothing like this. it does work in the real world, and its concepts of operation are sound.

however, i did speak to the tornado guys at SEMA show. i think my 4 year old knows more about auto engine air flow concepts. i even had a demo that proved that air didnt swirl , but was deflected by that kind of device. it did improve air fllow around radical bends in an intake, but certainly didnt have any effect on MPGs or hp unless it was used with a carburetor for better atomization due to the turbulence it creates where the air and fuel are mixed.
Now, that is snake oil!


Mk

mark kibort

Been in for over 10 years now.

Mk

mark kibort

The eRAM is a 1000cfm axial flow compressor. it can build pressure up to near 1psi. It draws 60amps and runs near 26,000rpm out of a 3.5" diameter.
(over 800watts input and near 3lbs of thrust so it is pretty powerful fan)

It easily exceeds the ram effect of the nose, hoodscoop or base of the windshield pressure, that is often considered for performace gains. as I have shown, .08psi can be seen at 80mph, while .36psi can be seen at 160mph.

There was something said about the air box not being able to hold pressure, and that is sometimes true. in fact, most leak under vacuum

one the main principles of the electric supercharger is that it neutralizes any vacuum in the air box. since this can be as high as .5psi vacuum you can see that 3% is lurking right there. So, in most all applications, .5psi vacuum is relieved and .5psi of pressure is generated, for a net 1psi change in pressure.
mached with fuel, this is where the gains come from.

Yes, it does have limitations, as it doesnt do much for my 400hp engine (330rwhp) if sealed and all the air flow goes through the eRAM. however, due to the fact that there is vacuum under WOT in the air box, even in the presence of a 100mph ram effect from the front and rear vents of the air box, i can see an extension of the HP curve after peak hp and a slight gain of peak HP of by 5. (last dyno runs , mirror images at 315rwhp and with the eRAM, 320).

On the smaller engines or engines of less HP (less mass flow required), we have seen 12hp gains on top of 240hp. (200 going to 210rwhp) Even greater gains have been seen and documented by independent magazines of up to to 10% gains, on hondas and the like.

Think of all the effort and expense spent on gaining 5-10 real hp. The eRAM is about average in areas of the bang for the buck, for the gains of most all the things you can modify to make your car faster.

Mk