924Board.org

[bryanc]

Has anyone tried this??
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=46098&item=7959104899&rd=1
An electric supercharger??
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'84 944
I'd rather have a bottle in front a' me than a frontal lobotomy
Tom Waits

[Helstrm]

LOL You could take the heating element out of your hair dryer and try that... Don't waste your time. It will not develop enough flow to see any additional power.

[bryanc]

I understand your critical review, but have you tried it?
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'84 944
I'd rather have a bottle in front a' me than a frontal lobotomy
Tom Waits

[ESC944]

THAT IS JUST ANOTHER TWIST ON A EXPENSIVE AIR MOVER, its not a turbo, not a supercharger, it DOES NOT MAKE BOOST.

THEY HAVE BEEN TRIED AGAIN AND AGAIN AND AGAIN, everything from selling you plans to make your own Eram/electric supercharger, to pretty packaging, to this, all you get is a cone filter and a 12V blower, designed for ventilating boats.

GO buy one at your local marine supply store and try it, atleast you will not be spend all that cash.

Every few weeks someone else comes up with a way to resell these on eaby, time and time again... their are several websites dedicated to debunking these as much as their are to selling them.

The only thing close to this type of setup that works is the Eram. Look it up. Their hard data gives you an understanding of what it takes to make boost/power. And in the case of their design, it isnt making huge power, but it does make power, but you have to look at the power that it takes to make that power for a better understanding, even if you can move huge amounts of CFM, that in an of itself doesnt make boost. You have to move enough air for the engine to breath through out the RPM range and on top of that you have to delivery the air under pressure.

BOTTOM LINE< you will waste your money on something like that. I dont need to try it I have seen several tested first hand, the only one that works on such a small scale is the Eram, period!

http://www.electricsupercharger.com/buyersguide.shtml

Now if someone copies the eram, well that would be a different situation, go check out the Eram and do a comparison, and then while you are at it, go look up marine supply companies on line and look at their blowes and the like:

http://www.hopkins-carter.com/catalog/Blowers.htm

They average about 250-300cfm, might do some looking and find one rated to 500CFM, but they do not make boost!

What is Electric Boost?
Electric boost uses electrical energy to drive a compressor that provides additional air density to the engine, as opposed to using mechanical energy from the engine like traditional methods (belt driven superchargers or exhaust driven turbochargers).

Generating pressure by itself does not require much energy.
Example: The small tire pump you plug into your cigarrette lighter is a compressor that uses very little electrical energy and can pump a tire up to 70 psi, but due to the devices low power draw, the small rate of air-flow coming from the straw-sized air-source requires over 10 minutes to pump a flat tire up to 35psi, and over an hour to reach 70 psi. Obviously useless if you placed this device on an engine intake as it would just create a massive restriction.

Generating air-flow by itself also does not require much energy.
Example: A radiator fan uses relatively little electrical energy, and can flow 400 to 700 CFM. However, just blowing air on something does not generate pressure, unless it there is both high air-flow rate AND air-speed. This is proven when one looks at how "RAM-AIR" works, which only develops .07psi at 80 MPH, but can develop .38psi when the car is traveling at 180 MPH with a perfectly efficient ram-air scoop like the ones that are seen on Indy cars.

Generating air-flow AND pressure together DOES require a large amount of energy.

Generating pressure at air-flow rates required by an automotive engine takes a large amount of power. That is why "roots", "screw", and "centrifugal" compressors require between 15-20HP taken directly from the engine in order to generate just 5psi to 6psi on a small engine. Larger engines require even more HP to drive the compressor in order to generate this level of boost at the higher air-flow rates these engines require.

The engine belts (or exhaust for turbos) must drive the compressor at a high enough rate of speed to generate enough air-flow so as to continually provide more air than the engine is trying to take in. Coupling the rotation of the compressor directly with the rotation of the engine allows the compressor to continue to generate pressure, even when the engine's requirement for air increases. Also, each 1psi that is added to the intake at these flow rates drastically increases the amount of power required to perform this task.

There is no "free lunch."
Regardless of what PSI is claimed by ANY maker of electric boost technology, what hp gains are claimed, or at what rpms the "fan" is claimed to rotate, the laws of air-flow dynamics require a specific amount of power to generate psi at a given flow rate.

Anyone using any other style of "fan" based boost claiming ANY HP gains on a car engine without a power source of AT LEAST 680WATTS (48 amps at 13.88 Volts) is LYING, and just ripping people off.

[Helstrm]

[morghen]

i wanted to try it...i have a 12V blower..but these guys made me change my mind...i think +5HP is a max ! so for +5HP just throw your spare weel out of the car and drop some heavy carpets form the back...i did that and unmounted the rear seats....

[81turbo]

You do realize that taking weight off of your car does not add HP correct?

[Llamaguy]

wow! a friend at work just told me about these and I was going to ask you but someone already beat me to it.

I was wondering if they truely work. I would think that if you could get a large enough motor you might make a few hp, but the alternator would probably take them all back to make up for the electrical draw.
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1987 924S Guards Red
1997 Suzuki Tl1000 Supersport

[morghen]

what kind of a question is that ? you cant gain hp by taking stuff off....but you can run faster..

[ESC944]

Well Its pretty simple

Roughly every 100lbs you shed is like adding 10 hp, for the purpose of performance.

In other words you have the same horsepower, but your car will perform as if you had add 10 hp, When you are talking little things, like say laptimes or 1/4 mile times, you are looking at tenths of a second etc...

Side by side two cars being equal for purposes of lets say acceleration, assuming equal gearing and same HP, but one ways less... assuming same response times, etc... all things being equal but weight... the lighter car would be quicker to a point... traction can come back and bite you... so being light isnt everything, proper Balance ah now that is something.

Seat of the pants performance, well if you car is lighter it will accelerate faster and slow down quicker... less mass in motion... or less mass to move.

[ideola]

Yep, balance is important...what we're basically talking about here is power-to-weight ratio, usually expressed in bhp per tonne...it's a common spec cited in most of the car mags.
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erstwhile owner of just about every 924 variant ever made

[Peter_in_AU]

Look a Lotus. They have always had a policy of adding performance by "adding lightness".

Back in the day (mid '70s) my cousin's Mk4 Lotus 7 (built in Christchurch, New Zealand) with a 1600cc twin-cam Ford-based engine pumping out about 130hp was clocked at just over 4 seconds for 0 to 60mph. In case you don't know, 0 - 60 in 4secs is still "supercar" territory. How did it do it? Simple, the thing only weighted 1000lbs.
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1979 924 (Gone to a better place)
1974 Lotus 7 S4 "Big Valve" Twin-cam (waiting)
1982 924 (As featured on Wikipedia)

Learn to love your multimeter and may the search be with you

[Khal]