[Kettles]

Originally Posted by multmigs

did you ever read your power bill where they charge you based on the quantity of KWH you are using? thats the same thing this guy is telling you I think he left the "H" of the end is all...

In a world of abbreviations and acronyms, every letter is important. I don't assume he made a mistake.

Regardless, I don't know the specifics of our engine, but starters draw ALOT of current. 2.2kw in a 12volt system is 183ish amps which sounds about right for a starter. Note however it draws 183 amps for 1 second, or 183 amps for 3 hours... it is a flow, not amount. 2.2kwh is an amount, which would be 183Ah, which would be 183amp draw for one hour (cranking the starter for 1 hour essentially).. but to consume that in 5 seconds would be a draw of a whopping 131760 amps............. I assure you that he did not not mean kwh.

[CherokeeGT]

the only way to know ifit will or wont work is to try it

turbos work and they just tap into unused energy to create more power
regererative braking uses momentum stored in batteries to help propel the vehicle later on it works too
iam shure an electric supercharger could work iam just not shure how well

also didnt vw scirocos have an electric vane type supercharger stock ?

[Boots95]

Originally Posted by rafterman45

why not?? only problem i would see is inconsistent cfm (hot air less dense than cold air), pissing off the ecu, and your fuel map would look like a roller coaster, service life of the motor being on constantly, (heat, wearing out bushings on the motor, armature) but i'm a big "fan" (pun intended) of thinking outside the box. i'd be curious to see how much it would take to pressurize the block with say, 8psi. then you have a baseline of how much you need out of your fan in terms of boost, and still being relatively friendly to your motor. I currently drive an 08 subaru STI and i'm running about 17 psi out of the stock IHI VF48 turbo, which is stated to flow in the neighborhood of 500cfm. keep me posted on your project

what year STI? if its a 07 watch out for cylinder 3 leaning out. If you have the cobb tune controller that will eat cylinder 3 right up. to get past that do fuel system cuz the car starves that cylinder and has something to do with where the exhaust is.

vids on you tube of my buddies and his car went through 3 motors

[rafterman45]

no its an 08. no cobb. still pretty much stock. SUPPOSEDLY they redesigned the intake (fuel rail, manifold) to address the lean cylinder issue. but only time will tell unfortunately

[justanotherjpr]

Possible? Yes, as the video shows. Plausible? Not really. A good idea? No.

[stoneytj]

i'm gonna say not possible also.

you would need a huge motor to spin your electric fan fast enough and with enough torque to get any boost out of it.

the motors we use on power wheel chairs at work(they will send a 300 lbs chair up 12.5 mph in less then 3 seconds) are huge! there would be no way to mount em under the hood.

they also run off 24vols and draw 70 amps-100amps if that helps at all.

[Deezelweazel]

Let me know, if you reach a usable power gain. I will pat your back very proud.

[Mickey_D]

I don't know. I'm thinking it would be more than possible.

Look at a turbocharger. The only motive force that turns the impeller is the exhaust gasses.

So you're using relatively low pressure relatively slow moving air to spin an impeller (very inefficient) that in turn spins a compressor (Also inefficient) to produce upwards of 15psi of boost. I mean, it's not like the air traveling down our tail pipes is under 100's of pounds of pressure nor is it moving at mach 5...

You can't tell me it would take horrendous amounts of power from an electric motor to spin that same compressor up to speed.

And as for speed control, tap into the injector pulses. Use that as a signal for a PCM speed controller on the electric motor. The more you push on the pedal (more boost required) the stronger the pulses to the injectors which in turn would pulse more power to the electric motor spinning it harder and faster.

I think it could be done quite easily.

[Kettles]

Now we just need someone with access to more than consumer grade electric motors, and an electrical/computer engineer to make the speed controller, and someone with access to a machine shop to fabricate the fan assembly.

I don't have any of those skills/tools, so I cant help. I just sit in the background and argue theories and criticize product inefficiencies.. I guess you could use a prexsiting turbo/supercharger.. or a leafblower, for the prototype assembly, then you just need the controller and motors..

[Mickey_D]

That's what I was thinking. Get a turbocharger that the exhaust side casing is cracked anyways. Go at it with a Dremel tool to remove any unnecessary crap from it so all that's left is the compressor part. Use the existing shaft from the exhaust side to hook the motor up to it.

It would have to be one hell of a motor, though. Capable of the RPM's that turbos require. I guess a gear or belt system to up the drive ratio would be required. But there are some high RPM motors out there. Just ask any RC car fanatic. I've seen some of them capable of 30,000 RPM.

As for the speed controller, again use one from an electric RC car. Would take some fiddling to get the inputs and outputs matched, but nothing a good electronics tech couldn't handle in an afternoon (speaking from experience here).



Hrm, y'all got me thinking here...

Now, if my one and only Jeep wasn't my DD and my business office I'd already be on this!!

[kboyts]

This has already been done and on the market for years.

Thomas Knight Turbo Electric Supercharger - Tech Review - Turbo Magazine

But due to the large current required to run it the extra batteries are depleted after around 15 seconds of boost, then requiring 6-10 minutes for the alternator to recharge them. Basically making the system similar to a nitrous system ( for short bursts of power) rather then a regular turbo/supercharger that can substain long periods of boost.

[Kettles]

Originally Posted by kboyts

This has already been done and on the market for years.

Thomas Knight Turbo Electric Supercharger - Tech Review - Turbo Magazine

But due to the large current required to run it the extra batteries are depleted after around 15 seconds of boost, then requiring 6-10 minutes for the alternator to recharge them. Basically making the system similar to a nitrous system ( for short bursts of power) rather then a regular turbo/supercharger that can substain long periods of boost.

I hope they are using deep cycle batteries so they don't fry the batteries every couple uses, lol.

Regardless of what has been done already, what can be done is still up for grabs. Don't stop innovating. I bet one can make one that puts out a lower boost pressure that wouldn't draw nearly as much power. It would still up the engine power.

[kboyts]

Originally Posted by Kettles

I hope they are using deep cycle batteries so they don't fry the batteries every couple uses, lol.

Regardless of what has been done already, what can be done is still up for grabs. Don't stop innovating. I bet one can make one that puts out a lower boost pressure that wouldn't draw nearly as much power. It would still up the engine power.

Well the one I quoted above only makes 5 PSI of boost. Any lower boost then that would be fairly worthless.

[Kettles]

It said in there on a 3.5l engine it would run 10psi... And the dyno run they said they "ran a safer 8 psi", his goal was 15psi which he said it would do. And by the way this was 5 years ago..

He is also running 20hp of electric motors, and we have seen a video of a leaf blower (most commercial leaf blowers are around 3/4 - 1 hp) boost a engine's power.. clearly you do not need 20hp to get the job done. I still say have at it...

[JTM1]

Brushless motors have come along way in the last few years, they only challenge I see is keep the motor and speed control cool enough.