all those figures..... that doesn't take into account pressure ratios

all those figures..... that doesn't take into account pressure ratios

:confused: What part of "its compression ratio is 2.5:1" doesn't take into account pressure ratios?

Or if I've misinterpreted, the actual wording on the website is: "nominal pressure ratio of 2.5".

If there's a difference, I apologise...

a pressure ratio and a compression ratio are totally different things

a pressure ratio and a compression ratio are totally different things

Oh, OK. I understand now!

Plus, I got it wrong with the boost pressure of the turbo

BUT. Maybe I can pick it to pieces in another way:

The ETS blurb says it consumes 30A at max load, so that's 360W, or 0.5bhp, give or take. The NASA jobbie's flowrate is around 3.5-4 times that required for a car engine, so what with pressure being proportional to volume, then for the NASA compressor's flowrate to be the same as is required for a car, it's power consumption ought to be in the region of 7000 / 3.5 = 2000bhp. Therefore, all other things being equal, the ETS compressor, with its 0.5bhp motor ought to have a pressure ratio of 0.5 / 2000 x 2.5 = 1.000625:1.

Seeing how atmospheric pressure can vary naturally by about 20 times that (say 1008mbar for a high-pressure system, versus 996mbar for a low-pressure system = 1.012:1), then I reckon you'd be better off making sure you only drove on fine days...?

I realise I'm beginning to sound like W*lshy on one of his "I've had a great idea about how we can all make cars better" trips, but I just want to get a handle on how much of a rip-off this piece of tat really is...

To put this into perspective, the turbo on the Fabia vRS has a peak compression ratio of 2.8:1 (so I'm told). And isn't the size of an office block. Nor is its power consumption 7000bhp.

Where do you get your facts from????

Are you not aware that you can put a resistor mod on a fabia:confused:

:P

I realise I'm beginning to sound like W*lshy on one of his "I've had a great idea about how we can all make cars better" trips, but I just want to get a handle on how much of a rip-off this piece of tat really is...

How about this then? The power you need to generate to run this fan is MORE than the power increase it will give you.

How about this then? The power you need to generate to run this fan is less than the power increase it will give you.

Right enough - we've been here before on this thread, and anything I can come up with can't beat that in terms of fundamental facts!

Are you not aware that you can put a resistor mod on a fabia:confused:

:P

How forgetful of me!

to be honest, i think for outright power the best thing to install is viper stripes accross the bonnet and roof, should be a garenteed 10% hike in power

Like these, you mean?

I'd say at least 2,593,482,654,298,765bhp now, compared to the 68bhp* they come with as standard...

*Blimey! That's the same as SWMBO's Comfy - and that's SLOW! :P

thye might only make 68bhp but they weigh about 4 stone!!

looking at the spec they aren't actually that bad for a 68bhp car as they weigh(according to parkers) 875Kg and do 0-60 in 13.7 seconds, now i had a 1.0 3 cylinder corsa a few years back that was 57bhp but weighed988Kg and took 16s to hit 60

but i did have before that an MG metro which was my little pocket rocket that i considered a fast car at the time with its 73bhp and 0-60 of 10s and 103mph topspeed!!!

mg metro... classic! i love them. a mate of mine has one with a 1800 k series engine in

a bloke down the road had one of the rounder later shapes with teh K series in it, mental apparently. just been looking at 6r4's and it turns out they are worth a lot fo money still :eek:

I think any of the group b rally derived road cars still fetch in the region of 40k+. (forgetting about the long wheel base quattro, as that was only really group 4 spec IIRC)

I understand they sold one to guy in Dawlish, Devon!!!

According to the blurb, its compression ratio is 2.5:1. And it's the size of an office block. And uses a 7000bhp motor.

Whoa look at the size of that thing I was looking at that then i saw the little bloke in there :eek:

I bet it's a bit laggy though.......They should strap an ETS pooper charger to it.

Apparantly There good for sorting out laggy engines like 1.4 civic's

i have got one question about the above device.... what's it for?? as far as i can tell it's just a giant patio heater

i have got one question about the above device.... what's it for?? as far as i can tell it's just a giant patio heater

Jesus can't you read :P

:orb_lol: I can't believe anyone has bought that rubbish, not only that they are all saying how wonderful it is. Its reassuring when you realise what you learned at uni regarding thermodynamics is totally wrong and it is possible to compress air and cool it at the same time.

I guess the clincher for me was they have spent thousands on it, and put in hundreds of hours of testing, very reassuring.

i have got one question about the above device.... what's it for?? as far as i can tell it's just a giant patio heater

"The Single-Stage Axial Compressor Facility is used to investigate the aerodynamic performance of small scale fans and compressors...", apparently. Although why you can't do that with a bit of pipe at either end, a U-tube manometer and an inverter on the drive motor is beyond me. I'm sure the NASA bods have their uses for it, though!

Like tuning 1.4 Civics!

:orb_lol: I can't believe anyone has bought that rubbish, not only that they are all saying how wonderful it is. Its reassuring when you realise what you learned at uni regarding thermodynamics is totally wrong and it is possible to compress air and cool it at the same time.

I failed my final in gas dynamics, and still know that much on the subject!