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for most of us, a commercial, bolt-on type turbo is outta the question for two reasons: availability, and price. IF it ever does become available from a quality source, it will cost thousands more than it would be worth on a $17k car. so, if you want more power in a very.. um.. custom design, not to mention dirt cheap... could this theoretically work?

i just bought a new fan for my computer's case. similar to an engine, cold air is vital for performance. so, being the wannabe riceboy i am, i got the biggest, fastest fan that sucks and blows a mean 152 CFM (cubic feet/minute). type R, baby!

now here's where my imagination went a little off-course. i was bragging about my bazillion-RPM vtec fan to one of my friends, and he mentioned that the holley 4-barrel carb he installed on his buick a few weeks back sucks 390 cfm. now, here's what i'm thinking... his car the mother of all cars, a 1978 buick park avenue coupe. this thing is over 20' long, 7' wide, and has a trunk that will hold 10 dead bodies... err.. golf bags. thus, it has a big freakin' V8 engine (i believe the original was a 454!). if this dinosaur of an engine sucks 390 CFM with a performance carb, i wonder what the civic does? time for a bit more investigating!

based on some calculations i did at a website (can't remember the URL offhand), the civic's intake should be moving ABOUT 170-210 cfm at redline. now, remember as i mentioned above, my computer fan does 152 CFM. and again, we're talking theoretically [IMG]i/expressions/face-icon-small-smile.gif[/IMG] here's my idea: take this fan (92mm x 92mm) and put it in a housing with a large intake hose (with the end mounted behind the grille or something), and have a smaller-diameter hose running out the exhaust outlet. run the exhaust hose through the main intake and mount the end right inside the throttle body. then, since the fan IS 12V DC, run a wire to the battery, and the other to a momentary push-button switch mounted under the gas pedal (or other location). the end result could be like a ghetto-NOS-turbo kinda thing that would give you like 500+ HP! okay, maybe not.. but it might do SOMETHING, right? the thing i'm unsure about is if the computer could compensate for the boosted airflow that quickly... i know some have talked about needing to reset the computer after installing a CAI, but this is sorta different -- a CAI would give increased airflow on the same linear scale, whereas the ghettoturbo would do it exponentially. unless... you remove the switch, and instead you rigged it up to a rheostat which was somehow linked to the accellerator... increasing the fan's speed when the pedal was pressed, and lowering it when released, but always spinning to produce at least a minimal boost... hmmm....

damn, this got long [IMG]i/expressions/face-icon-small-smile.gif[/IMG] but an interesting theory anyway... or maybe i just need to go to bed? lol..

 
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Umm E-Ram Supercharger has allready been invented..that fan works at very high speed but has no load resistance..under load it bogs and the motor burns so it's pretty useless...

Cheers
Mohawk

 
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honda-tech:

"err sir your car has injested bits and pieces of what appears to be a flimsy computer fan"

 
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<< honda-tech:

"err sir your car has injested bits and pieces of what appears to be a flimsy computer fan" >>



lol good one ghosty, not to mention the cfm specs for computer fans are different than the civic spec cfm's, for one, the cfm you gave for the civic is after all the resistance from the tube length to god knows what's in that air filter. the cfm from the computer fans are takin about 1 inch away from the blades that are spinning... well all this goes to my point. computer fans are not strong enough to do jack crap.... now if you used them to cool down your SRI somehow... then thats a different story.... but then why not just get a CAI?

 
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In theory I think this is good, but in the real world I think its just one of those things that wont work.

 
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<< Umm E-Ram Supercharger has allready been invented..that fan works at very high speed but has no load resistance..under load it bogs and the motor burns so it's pretty useless...

Cheers
Mohawk >>




yeah E-Ram beat you to it, go back to bed [IMG]i/expressions/face-icon-small-wink.gif[/IMG]

 
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have any of you seen the cost of the e-ram!?

 
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the whole idea is a bit of a stretch, but a possibility nonetheless.
now just to clear this up for the uneducated that are going to base their opinion on ghosty's joking response: i've never heard of computer fans blowing to pieces. and if this WERE an issue, it would be solved by putting a mesh screen before the outlet. also, how is an air intake's CFM different from a fan's CFM rating? I'm talking about the ability to move air, not velocity or pressure of the air.

i don't know anything about the e-ram, i'll be researching that later... but some useful info would be appreciated rather than "it works at high speeds but burns out under load"... in what, a twin-turbo corvette with NOS? no product on the market is that unreliable...

 
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bc if you're only using it at full throttle, and your engine is using 170cfm, and the fan is blowing 150cfm, then the engine is creating a vaccum around the fan (by "sucking" all the air it needs at WOT on its own) and the fan just spins with no load...

A fan spinning in a column of air will not have any load UNLESS it is doing the work... if 170cfm of air is blowing by the fan b/c the engine is sucking air, then the fan is not under any load, won't help the intake flow, and would be a bad idea

not a flame [IMG]i/expressions/beer_yum.gif[/IMG] just my 2cents

 
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........so if the fan is not assisting in additional loading...then it is just in the way!!!!...Right?

 
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I think you're talking about this: I've made it already. This motor is expensive. Designed at 48000 RPM and quite a bit of torque. It consumes double the power of a dremel at max speed. Supposedly it is rated at 8.4V power but hooked up to 12V (car battery) this thing really churns. It can easily fly itself no prob and this thing weighs like 3 1/2 lbs. In order not to lose any pressure exerted by the turbine, I had to make the clearences for it to be LESS than 1 mm from the tubing wall for each blade.





THis thing is unbreakable, and key thing: It doesn't rattle inside the tubing.


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ALLMAN: yepyep [IMG]i/expressions/face-icon-small-smile.gif[/IMG]

DriftR: whats the rated CFM on that fan?

 
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ah-ha! i didn't think of that before... i was thinking that it would just add that much more air regardless of the main intake's power. silly me [IMG]i/expressions/face-icon-small-tongue.gif[/IMG] thanks for clearin that up guys...

now, DriftR -- holy sh*t that's cool! have you noticed a significant difference with it? nice work, even if it just looks cool [IMG]i/expressions/face-icon-small-smile.gif[/IMG]

 
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Well, the main purpose of this is to gain back the low end air velocity when using an intake. At top end, it should make no difference......maybe neutralize some of the negative pressure caused by the filter. In other words, there is low end gain but not really much on the high end.
As for CFM, I have no idea. The motor was designed 1/10 scale RC car racing. I pushes a 5.5 lb car over 48 MPH