Make-shift Turbo charger.....ARE YOU KIDDING ME

[MotorWerkz]

I never actually have intention to buy it

and I'm not really obsessed with power...if I want to play with F/I, I would buy supra(like in your sig), RX7 or audi S4

[lehman]

Originally posted by MotorWerkz
you don't need to buy this stuff... I just like debating some simple physic argument ...

oh......... well argue a better product than an Ebay scam



"like in my sig", yeah i know what a supra is. like in my sig thats my car dude. sounds like you trying to call me out

[MotorWerkz]

[Ghettoraid]

I've seen this debated multiple times on different boards.. there was this really great link someone posted about how its physically impossible for the e-Ram to do anything... but this is the best I could find ...

http://www.crxsi.com/resources/classified/ads/2789.htm

Some guy who represents this product/company behind it is fighting the naysayers to the bitter end.

[eeeks]

If that thing really worked, dontcha think more folks would be running them? Forget AA, Vortech, Dinan...and go with the glorified leaf blower? BAH

[Ghettoraid]

my friend hooked up a high hp electric leaf blower to his Civic before the swap... Says it felt peppy...

Never road tested it cos we couldnt work out a way to keep the blower powered... hehe

[GregD]

This is for bernman

Instantaneous rate of change in pressure for one cylinder, with displacement volume 0.55L and compression ratio 11:1 (sound familar anyone ?)

Idealising fuel/air/combustion mixture as an idea gas which is good enough for our circumstance and temperature at 900K which may be a bit low;
Intial pressure just as combustion is occurring prior to outflow of exhaust gases

P = nRT/V
= approx 32 atm
Pressure after combustion = approx zero
So we have instantaneous change from +32 ATM to approx 0 ATM

Using Bernoulli equation as an approximation as I am not going to solve some differential equations for this thread, we can see that p1-p2 = 1/2(density)*(v1^2+v2^2)
so change in pressure is proportional to the non-normalized magnitude of change in velocity

-32 = 0.5(1.20)(Magnitude of change in velocity)
= 54 m/s
Fairly fast, and these calculations are pretty rough approximations.. the real value would differ due to compressibility of the gas, turbulence etc.

Now those fans increase PSI by less than one, so the maximum velocity increase they could provide would be at most
approx 1.66m/s using the above approximation. What is important to realize is that even though the fan does increase the velocity of a segment of the airflow IF THE AIRFLOW WAS STATIONARY (eg when they show it flying in air), the fact that the air is rushing by so fast completely negates action of the fan.. the fan is being blown by the incoming airflow.
Even more dangerous is what happens when we look at the effect of the fan running in the engine. If it optimally it can increase speed by 1.6m/s and it is being spun by air close to 54m/s its going to fail, and fail rapidly, as the bearings in these shitty little fans are not going to hold up to such high RPMs. Then you are going to **** up your engine.