Better of buying a huge leaf blower like that famous V8 video clip that was knocking about
My car runs on Propane... hmmm
Rich
Better of buying a huge leaf blower like that famous V8 video clip that was knocking about
My car runs on Propane... hmmm
Rich
Fit a VNT ball-bearing turbo, fit a 6-speed box, fit a bigger engine ...Originally Posted by PiNiOn
Ok Ok, convinced already!! Now back to finding a way to impove that low rpm range..
Are VNT turbos widely available now for petrol engines?
Nope. Turbo-technics did/do a VNT-28 with integral wastegate, but its Ģ1K...
HKS were working on one in 2006, don't think anything came of it though.
They will eventually start getting more popular once the prices come down, though.
we tested a powerful (compared to the usual ones) electric supercharger on a 3SGE MR2 engine over a year ago, just to prove a point.
timed with datron timing gear and rolling roaded it.
no effect at all.
infact it lost a little torque low down with it on, presumably due to extra load on the electrical system.
if you knew how much air an engine consumes, even at idle, youd know theyd not do owt.
how much? some 10cfm?
have you ever put your hand over the open end of the AFM before, on idle, (if you took the filter off so its just the large afm opening)
your hand gets sucked into it harder than it would a household hoover,
and concidering its not a liniar ammount of extra suction as the revs rise, it gets more and more as the power increases, i think you would be a very very brave person to try and put your hand there with it on boost
Come on guys. How many times do we have to go through these things.. No wonder those are made if people are this stupid.
Hereīs once more a comparison which clearly indicates that it is virtually impossible to have any gains with an electric charger.
The amount of air that flows into the cylinder, compared with the cylinder volume, is called the engine's breathing - or volumetric - efficiency. In a 3 litre six cylinder engine, each cylinder has a swept volume of 500cc. If the cylinder breathes in only 400cc on the intake stroke, the engine is said to have an 80 per cent volumetric efficiency (ie 400/500 = 0.8 or 80 per cent). Volumetric efficiency will depend on lots of factors (including how well the ports flow), but let's say that the VE of the example engine is in fact 80 per cent. If this 3 litre engine is revving at 6000 rpm full throttle, this means that it inhales 7200 litres of air per minute (remember, one intake stroke per two rpm), or 120 litres per second. To put it in different units, each minute this engine consumes 254 cubic feet of air. To put that into context, a little 60mm diameter PC cooling fan flows only about 18 cubic feet per minute. So, just to flow the amount of air that this naturally aspirated, 3 litre engine needs, you'd need an array of fourteen 60mm fans working flat-out. And that's without creating any boost at all....
Ale I think you didn't read usWe are not that stupid as you think
We were not going to replace our turbos with this electric "charger"
If we take 1.8L with 80% VE at 2000rpm, it's 1440liters of air or ~50cfm. If tiny PC fan can do 18cfm, I don't see why a bit bigger fan wouldn't push 50 (and that would be 1 bar of boost!!!).
So with your post you actually proved me that it is possible
Of course.. a PC fan blowing 18cfm is simply blowing across a heatsink and not trying to create positive pressure - which is where the problems arise
Rich
ALE, that is the calculation for a NA engine, a turbo is pressurising the engine too so there is not just the capacity of the engine to calculate,
i really dont have a clue how to work that out personally tho lol
Thatīs exactly why the example is from a 3L engine instead of 1.8 or 2L.
Wrong. Even if you could provide that much air with a fan it would just mean that the fan isnīt a restriction, not that it helps anything.
You are correct. OK we will need 100cfm to provide roughly 1 bar of boost. Is it impossible?
What you need is one of these.
Bren sells them (out of a suitcase) down the market
Wow, guy has achieved incredible resultsWe would need 1/10 of that power to spoolup turbos much faster
He says 400 seconds of boost from 4 heavy duty batteries in the boot. Far better to just run the supercharger off of the engine than all the messing around with expensive electric motors, heavy batteries and miles of cable.Wow, guy has achieved incredible results
following on from the jet engine idea check out
http://raceenginedesign.biz/Manic-Beattie.htm
granted its a bit over the top for what your after but inspiration all the same
and a link to a short vid
http://www.youtube.com/watch?v=11687nVdzdk
costs a bit more than Ģ20 though...
400 seconds capacity of his power level would be like 4000s for me. 4000s of spooling up turbo - I probably wouldn't use it in 2 weeks of city driving
And for me it's easier to put some cables and batteries than to install supercharger pulleys/brackets/belts/control systems.
Don't know why so many people are so sceptical and don't even give a chance to some new ideas (some of which are in fact very old).
I think its a case of the 'other' methods being easier, cheaper and more viable
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