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Is there such thing as a real electric supercharger? There are alot of ebay ones which sell for $30+ and I looked at some of the seller's feedbacks and it looked like most people were satisfied about what they bought. I also googled Electric Supercharger and found this supercharger selling for $199. How would I know which one works and which one doesn't?

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None of those will work. It's a scam that's legal until a law is passed about it.

A Supercharger is turning into a vague term. Save yourself the $200, and attach a used leaf blower motor underhood into your air intake and rig up a throttle; that's the just of it. Adding more air without adding more fuel is a big no-no. The engine will suck in the air it requires. A 'real' supercharger forced air directly into the engine manifold, where more fuel is introduced. Generally it's tuned to run at a lower compression ratio to avoid engine problems, such as 9:1. Premium fuel is also required in the majority of applications. Guys build these 'electric' kits themselves in grand quantity for a few bucks, and make 900% profit on something that doesn't work. Forcing air into the engine will give you a few HP, but without adding the proper fuel to keep a good air to fuel ratio, can cause detonation problems and ultimately engine failure.

As good as Ebay can be, some things are better left alone. Electric superchargers are just as bad as a throttle body spacer, which is suppose to swirl incoming air into the combustion chamber - it doesn't provide any power increase. In some cases, vehicles were put on the Dyno and LOST HP and torque because the air has to travel farther to get into the engine! They run about $30 and cost $2 to make, so profit is high and 50% of that profit more than likely goes toward marketing ventures.

Putting a small metal fan that spins inside a cone air filter, isn't a real supercharger. They just can't figure out what to really call it. Calling it "Scam" just doesn't sell as well as it did fifty years ago, so "Supercharger" was the next best thing.

If you really want to add a supercharger, contact Eaton and speak to a rep. They'll love telling you to how you can go ahead and waste your money on knockoffs where the only place they perform, is taking your money. There are plenty of supercharger kits you can buy for select vehicles. It's a matter of having the proper underhood clearance necessary to facilitate a REAL supercharger.

I'm glad you asked here before you made a purchase that you'd regret!
 

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He has got a really good point. You need more fuel/air not just more of one. CAI add a little bit more air in there, but nothing it can't handle.
 
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