Electric Supercharger?

[dave85]

Says somewhere in that ebay ad. that it takes 30 amps at maximum output. 30*12 = 3600 watts

A 4kw extraction fan will shift nearly 3000 cubic feet of air a minute. Its generally thought that to support a 100 horse engine, you need 150 cubic feet a minute of air.

Bolt that fan to a 100 horse engine. Allowing for the fan to be utterly crap at pressure and only work at 1/10 of its output, you're still looking at 300 cubic feet a minute. That's 1 bar of boost.

I know the thing looks silly and probably is complete rubbish, but it might just work.

[nmt_oli]

Says somewhere in that ebay ad. that it takes 30 amps at maximum output. 30*12 = 3600 watts

A 4kw extraction fan will shift nearly 3000 cubic feet of air a minute. Its generally thought that to support a 100 horse engine, you need 150 cubic feet a minute of air.

Bolt that fan to a 100 horse engine. Allowing for the fan to be utterly crap at pressure and only work at 1/10 of its output, you're still looking at 300 cubic feet a minute. That's 1 bar of boost.

I know the thing looks silly and probably is complete rubbish, but it might just work.

I expect the extraction fan to be slightly more efficient however- the air velocity will surely be slower due to larger piping, and ti will be runnign on an AC motor, and have proper design put into it.

I don't doubt this can shift a fair amount of air, but with a pidly fan like that, it couldnt maintain a pressure more than a couple of PSI above what there, if any.

Even if it does create boost, most ECUs will get VERY confused, since its only activating at full throtle, and not progressive like tubos and super chargers(which also have ECUs designed to cope with such fluctuating airflows). Incorect fueling can seriously damage engines, and its not worth the risk.

If you want bolt on power, get Nitrous Oxide. Its well proven, safe if installed properly and gives good power gains.

[N.Wood]

Says somewhere in that ebay ad. that it takes 30 amps at maximum output. 30*12 = 3600 watts

A 4kw extraction fan will shift nearly 3000 cubic feet of air a minute. Its generally thought that to support a 100 horse engine, you need 150 cubic feet a minute of air.

Bolt that fan to a 100 horse engine. Allowing for the fan to be utterly crap at pressure and only work at 1/10 of its output, you're still looking at 300 cubic feet a minute. That's 1 bar of boost.

I know the thing looks silly and probably is complete rubbish, but it might just work.

They may be able to move that amount in a free and open environment, but will they really be able to maintain that pressure in a pipe in a tight engine bay?

And its more about the compression of air (i.e PSI) rather than the amount of air it can move (CFM) isn't it?

[JTM]

Are you kidding?

These things fall into the same category as the increased mpg/performace chips that are on there, or the air filters which claim 25bhp. They are for iditots who stick bits of plastic to their cars.

[BONGO]

Are you kidding?

These things fall into the same category as the increased mpg/performace chips that are on there, or the air filters which claim 25bhp. They are for iditots who stick bits of plastic to their cars.

Hig octane boost juice adds 77BHP, Honest.

They are very clever, in that they do work in the way that theaory determines an improvement. Then this is noted by the buyer and interpreted into an actual powergain in practice, which nearly always isn't the case!

Cheap gains aren't normally gains you can feel. That's why they are cheap! They are just in the price bracket to reach out to people with a slight interest, but not too much knowledge to click on, and not enough money to bypass them and get to the proper modifications, IE: teen drivers.

Bongo

[Gavyn.]

I got one for my pit bike, it was really similar to the car ones just smaller. It was quite shit. it made the bike accelerate a fair bit quicker but when i was flat out the fan was too slow and was preventing as much air coming into the engine which slowed it down.... a lot.

[Dr Greenthumb]

I love that you have an astra/vectra. Just makes the stupidity more believable.

[Fish-Finger-er]

Says somewhere in that ebay ad. that it takes 30 amps at maximum output. 30*12 = 3600 watts

A 4kw extraction fan will shift nearly 3000 cubic feet of air a minute. Its generally thought that to support a 100 horse engine, you need 150 cubic feet a minute of air.

Bolt that fan to a 100 horse engine. Allowing for the fan to be utterly crap at pressure and only work at 1/10 of its output, you're still looking at 300 cubic feet a minute. That's 1 bar of boost.

I know the thing looks silly and probably is complete rubbish, but it might just work.

as has already been said its more about pressure which a fan like that cant hold, than the actual amount of air, in the same way in theory your extraction fan should pump up my tyres in about 1/10 of a second, compared to a foot pump, but when you look a bit more deeply into it, because of blade construction/spacing it cant hold any of that presssure and is largely useless.

but thats not enough to warrant a post, as its already been said, so this would be a worthless post if, i didnt point out the following

30*12 = 360 watts, not 360 watts, we can then go talk about how its going to be very ineffecient, but even working at 50% efficiency when pressure loss etc is took into account, its still only shiftin 150 cubic feet of air per minute, giving the car a total of 0 bar of boost.

note none of me calculations are mathematically proven or anything, and this post doesnt really serve much purpose, other than to point out mr potts inability to remember the 12 times table.

[dave85]

They may be able to move that amount in a free and open environment, but will they really be able to maintain that pressure in a pipe in a tight engine bay?

And its more about the compression of air (i.e PSI) rather than the amount of air it can move (CFM) isn't it?

Boost pressure and volume are both important, they're inextricably linked to each other by the power input to the blower. Of course, a properly designed electric blower will be able to do the job, the cheapy one looks anything but that.

Seem to remember Peugot talking about a dual blower system, bit like the VAG twincharger engine but with electric rather than mechanical supercharging at low revs.

[Danny]

Is exactly where these things belong.