SCharger

[CKniht90]

Porsche 944 Electric Supercharger Kits Porsche 944 Superchargers I know its 3psi.. but thats the limit for a NA engine right? Also, I'm sure you seen these around... what review would you give these superchargers?

[AaronM]

People who are stupid enough to buy that kit deserve to lose the $200 that is being charged for it.

If someone honestly believes that the tiny little fan can actually create 3 PSIG of positive manifold pressure, and that 3 PSIG is enough to add "80 hp", and that adding 80 hp is somehow still, "fully within range of your car’s ECU, fuel maps and timing configuration", then that person is too damn stupid for me to care that he's being cheated.

The stock Turbo cars run ~11 PSIG of positive manifold pressure and gain about 60 hp compared to a 2.5 liter 8v engine (Turbo S cars have about a 90 hp gain). There's no way that 3 PSIG will somehow magically cause an 80 hp gain. There's also no way that the little fan in that "kit" is going to give you a 3 PSIG manifold pressure boost.

In short, the website is so full of ***** that it's almost funny.

[CKniht90]

oic ok... haha... Well thats why i asked.. I remember some one telling before when first started in these forums to always ask on here if I have any trouble or questions about this car or modifying it. I think it was Ernie lol

[Endat]

I wouldnt be so quick to dismiss something as voodoo nonsense... Even though, in the Geo Metro's case, that would be a 200% gain in power

Geo Metro Electric Supercharger Kits Geo Metro Superchargers

They say the same 80hp for everything, they probably got that number from a mustang or something where the engine setup is **** from the factory... I would still give it a try, you wont get 80hp from a 944, but you might get 5 or 10.

Or adding it to the turbo could help it spool better.. people have added weird **** like this to turbocharged cars with positive results

[Dantilla]

Long thread about this some time ago on the 911 board.

A couple basic engineering equations prove that this cannot work. In order to produce the positive pressure claimed, enough electrical power is required that it would literally melt the wiring within 8-10 seconds.

One of the funniest threads ever, when the guy promoting the electric supercharger kept making the same rediculous claims over and over, totally unable to answer the challenges posed by a few very bright engineers.

Finally came down to dyno runs. A couple guys volunteered their cars, showed up at the dyno, Mr. electric supercharger approved the cars and testing methods. The dyno runs showed zero gain. Zero.

Then Mr. electric supercharger came up with all kinds of reasons the dyno runs were unfair, and it really was a great product. More hilarity ensued when he was called on the carpet.

Eventually, I think the guys head just exploded. Went nuts at everybody who questioned him, until he left, never to be heard from again.

Bottom line- This makes as much sense as the guy who poured BBs down his intake to clean out carbon deposits and destroyed his engine.

[HondaDustR]

I'm sure it makes a cool noise on a ricer car that will make it sound fast, but it probably doesn't work. People have tried leaf blowers with no results.

[Endat]

Originally Posted by HondaDustR

People have tried leaf blowers with no results.

Guilty!

[smokin_944]

Originally Posted by AaronM

People who are stupid enough to buy that kit deserve to lose the $200 that is being charged for it.

If someone honestly believes that the tiny little fan can actually create 3 PSIG of positive manifold pressure, and that 3 PSIG is enough to add "80 hp", and that adding 80 hp is somehow still, "fully within range of your car’s ECU, fuel maps and timing configuration", then that person is too damn stupid for me to care that he's being cheated.

The stock Turbo cars run ~11 PSIG of positive manifold pressure and gain about 60 hp compared to a 2.5 liter 8v engine (Turbo S cars have about a 90 hp gain). There's no way that 3 PSIG will somehow magically cause an 80 hp gain. There's also no way that the little fan in that "kit" is going to give you a 3 PSIG manifold pressure boost.

In short, the website is so full of ***** that it's almost funny.

Ok, but tell us how you really feel!!roflmao

[flash968]

social darwinism at its finest

P.T. said it best though, and it still holds true today

[944 Ecology]

Please send me the $200. I will send you good karma that will make your car more reliable and faster. I will also make it weigh less.

[running_cold924]

YouTube - Leaf Blower Turbocharged Ford Ranger (HUGE Power)

[flash968]

yup - that's about the increase i would expect - pretty similar to any really good cold air intake

the aftermath was funny though - i wonder what they shot in there and screwed up?

[running_cold924]

probably had a leaf stuck to the mass air sensor... lol

[mxfrank]

Cold air intakes are nonsensical devices. Especially on a 944, which draws combustion air from behind the front fender. That said, a 12V supercharger would give comparable performance to a 15A/120V leaf blower if you had an alternator and wiring system capable of delivering 150 amps of current.

[CKniht90]

Originally Posted by mxfrank

Cold air intakes are nonsensical devices. Especially on a 944, which draws combustion air from behind the front fender. That said, a 12V supercharger would give comparable performance to a 15A/120V leaf blower if you had an alternator and wiring system capable of delivering 150 amps of current.

In other words? Lol

[flash968]

cold air intakes WORK, period - it is not hard to measure either - grab yourself a manometer and a couple of temp sensors, and measure the negative pressure and intake temps - you will quickly see the effects, which are easily proven physics

i have yet to find a factory setup that works better than a TRUE cold air intake - the key is the box around the air filter, separating it from the engine bay, and the amount of surface area of the filter - you can't just stick a cone filter in there and expect gains - that is why so many people think they don't work - you have to do it right - if you do though, you will see gains on any engine

known physics - every 15 degrees of intake temp dropped equals 2 hp on an engine this size - reduce negative pressure and you increase flow after the filter - more flow means more power

cold air and lots of it equals more power - while you won't likely see 15 on this engine, you will see 8 or so with a decent setup

as for the electric gadgets, the power draw costs power, so you have to factor that in too

[AaronM]

Originally Posted by smokin_944

Ok, but tell us how you really feel!!roflmao

There's a reason I've chosen "Ornery Bastard" as my user title.

[CKniht90]

haha.. you did come off a little rough.. but I've come to expect that from other car lovers

[wild man]

Believe it or not, there is 1 that DOES really work. That is the one made by Thomas Knight. It uses an 8HP motor, and (supposedly) can maintain 15psi up to 6Krpm, on a 1.6 liter engine. But on our 2.5 engine, it would probably start out at around 10psi, tapering down to maybe 4 or 5 at 6K.

Those are the pros, but here are the cons:

It is quite expensive, FAR exceeding the cost of the others.
It needs 2 additional batteries (24 volts, at like 400 amps), to power it.
It needs a special setup to be able to recharge those batteries.
It can only be run for 15sec max, before it will overheat.
It needs quite a few minutes to cool (and recharge the batteries) between "runs".

When automotive electrical systems go to 42 volt, some of those cons will no longer be issues. But for now, this is "the state of the art", when it comes to the ESC.

It takes a lot of power to make boost. Bottom line is that a motor which draws less than 30 amps (or even more than that) at 12 volts simply cannot do it.

[wild man]

Originally Posted by HondaDustR

People have tried leaf blowers with no results.

I've actually tried it myself, many years ago, on the 77 924. When I first hooked it up, with the outlet of the blower open to the atmosphere, it could draw enough air through the fuel distributor to fully lift the plate, so I thought that it might work. But with the outlet connected, no results! I did some 0-60 runs, and saw NO improvement.