Narthur
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| posted on 31/10/05 at 01:50 AM |
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Electric chargers
Well whilst researching the possiblity of a Supercharger i've been googling and the amount of crap thats come up is amazing.. however i cam
across these two sights
and whilst i can see what they are aiming to achieve with there products i wanted to know what you guys think.
I know that there's no way they are going to get the power out of there electric fans like a turbo or a supercharger but the E-ram one does look
quite powerful look at the videos.
What puzzles me is why they want u to mount it (if ur crazy enought to spend £320 ) after the MAF sensor?
anyway ...ERAM
and they reckon on this sight they can get 2.7psi.. hmm doubtful
Electric turbo
Do you think these work? honest opinions.. N
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dl_peabody
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| posted on 31/10/05 at 01:55 AM |
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I have heard of electrical "turbo's" ( a blower that bolts to the Honda Accord V-6 that is supossed to give 60 extra HP...)
(Warning my hotrod brother told me about it, I am rather certain his new wife wont sign off on it.)
Don't know anyone using one though.
[Edited on 31/10/05 by dl_peabody]
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heinlein
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| posted on 31/10/05 at 07:36 AM |
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Alternative superchargers
I believe I read somewhere that the general consensus is that they either don't put out enough pressure to make much difference or they
won't last very long or both.
Garrett of turbocharger fame was doing research into hydraulic superchargers which I was interested in, but I heard they dropped it.
When you're lying in the midst of the Afghan plains and the women come out to cut up the remains; just roll to your rifle and blow out your
brains and go to your god like a soldier.
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RazMan
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| posted on 31/10/05 at 09:08 AM |
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Very interesting but I must admit to being more than a little sceptical. If they could offer a money back guarantee that the power levels they claim
are true, they might persuade a lot of people to give it a try.
But look at the specs - 57 Amps! Surely the alternator on smaller cars will have problems.
The twinned version spins at 75000rpm :eek:
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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MikeR
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| posted on 31/10/05 at 09:17 AM |
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unless my maths is wrong, 57amps at 12 volts is 686 watts....
not a huge amount, but a a lot for a car to power.
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NS Dev
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| posted on 31/10/05 at 10:27 AM |
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certainly not enough power to give any real level of supercharge.
Bear in mind that the little Eaton M45 as fitted to the BMW mini among other cars, uses around 15hp in the middle of its efficiency and speed range!!
That's around 11,000 watts.
To operate that from 12v supply would mean a supply of around 917 amps....................not terrifically feasible.
I think the snake oil brigade are really doing a good job on this one!
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bimbleuk
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| posted on 31/10/05 at 12:32 PM |
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The only one I've seen with any power is driven by three starter motors! It can only be run for short bursts.
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NS Dev
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| posted on 31/10/05 at 12:57 PM |
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............................and if I were using the car battery to generate 11Kw for a supercharger, I'd bypass the whole inefficient internal
combustion engine in the middle and couple the motor up to the gearbox directly, far easier and more efficient, just like Panoz did at Le Mans all
those years ago!
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MikeR
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| posted on 31/10/05 at 01:00 PM |
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does that mean 1hp = 733 watts?
I suppose there are two things here - turning a fan fast enough to flow enough air & turning a fan fast enough to COMPRESS the air.
Oh, 917 amps .... 0 gauge wire is 8.5mm copper cross section and can carry 250 amps - how flipping thick wire would you need?
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NS Dev
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| posted on 31/10/05 at 01:08 PM |
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Bloody thick!!!
Mind you, just been looking in our old mill at the piercer motor wiring that they are ripping out...........................8000 amps @ 500v DC, thats
a BIG wire!!! (well, 3 actually!)
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iank
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| posted on 31/10/05 at 03:30 PM |
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quote:
Originally posted by NS Dev
Bloody thick!!!
Mind you, just been looking in our old mill at the piercer motor wiring that they are ripping out...........................8000 amps @ 500v DC, thats
a BIG wire!!! (well, 3 actually!)
That's a weighing in opportunity if it goes (briefly) in the skip  more of a rod than a wire I'd imagine. 
Wire guage depends on a lot of factors when you start talking big currents (length, allowable voltage drop, max temperataure, material) but I'd
guess 200mm2 would be in the ballpark for 1000A (this from the web - "35mm2 copper wire can take continuous current of 170A on free air and 200
A on ground. The wire can handle 5 kA short circuit current for 1s."
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NS Dev
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| posted on 1/11/05 at 12:04 AM |
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part of it was actually flexible cable but the majority was copper busbar to be honest, and yup it's in the skip at the mo, don;t think
it'll go in my car boot though!!
Dunno exactly the setup of the motor. It says 2.4 Megawatt on the casing, and I know that it trips out at 8000 amps, but I have never seen current
over 7000 amps for more than 20 secs continuously. It is peaking over 20 secs every 40 secs or so though (as each tube is pierced) so it certainly
takes a hammering. The old motor is being dismantled and packed up for spares for our other mill.
I'll try and get some photos in the next coupe of days, the assel mill that is coming out was the last assel mill in the UK still operating. The
transval mill that we have running now is the last tube elongator of it's type left in the UK, and I think our Head-Wrightson MC Co piercer is
also the last of it's type operating in the uk, so it's nearing the end of an era of british seamless steel tubemaking, with only one mill
left operating, and who knows for how long!??
[Edited on 1/11/05 by NS Dev]
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