FishProfiles.com Message Forums

I get 25mpg on the highway... driving like a normal, responsible person. 6th gear is very long so at 55mph, i'm turning 1400rpm's. Barly above idle So she sips the fuel when she wants to, but lay that hammer down and watch the gas gauge plummet. It's all in how ya drive

What do you have sun?

Terranova - tell us the cool places you have driven to so far:
to see friends
to get snacks at 10pm... just cause
etc
&tc

/:'

~~~~~~~~~~~~~~~~~~~
~~~ My fish blow kisses at me all day long ~~~

my friend Dee started this thing when she got her license...it's called "midnight runs"

what it means, is leaving the house around 12 to pick up completely pointless fattening snacks and usually movies tooo

-Formerly known as the Ferretfish

I like mountains of torque rather than top end, and with all the superchargers available for my car, they all come on power around 3k rpm. Now if someone could wedge in a twin screw whipple type supercharger that makes power even at idle, i'd be there!

What you're describing sounds more like a turbocharger than a supercharger.

A supercharger mechanically forces induction via a pump driven off the crankshaft, so it delivers compression boost right from 1 RPM upwards. A turbocharger is a turbine booster fed via exhaust gases, and with those devices, there is a lag before the real power kicks in, though modern ones are pretty good at delivering boost from as low as 2,000 RPM (that's crankshaft measurement). Only trouble with a turbocharger is that it gets a tad warm ... with hot exhaust gases spinning compressor blades at anything up to 25,000 RPM, the internal components can reach 900 degrees Celsius in a high performance unit, which is usually built to engineering tolerances more usually associated with the aircraft industry than the car industry.

Here in the UK, Aston Martin use superchargers rather than turbochargers because they want the 'oomph' from the word go. Mind you, you get a lot of 'oomph' from a 6.3 litre V12 in any case ... Take a peek at the Aston Martin Vanquish S ... nice stats for that car. Only trouble is, if you want one, the cheque you have to write out is a bit steep ... for the price of one of those, you could buy eight Camaros ...




Panda Catfish fan and keeper/breeder since Christmas 2002

I know what a turbo and supercharger are

There are a few different kinds of superchargers, and the roots type that make power at idle are too large to fit into the engine bay of my car. There are several centrifugal kits that are designed for my car, but they use an impeller design (like a turbo, most likely the basis of your confusion) and don't create much boost at low RPM's, and have a little lag too.

"Passenger Says What" -

Fill the car with Fuel, Foods, and Friends - The passenger(s) gets to pick the turns and if things go REALLY well. . .you will eventually get back close to where you started. Map is optional... The whole objective is to find your way back before the gas runs out.

Try it.. if you end up at my house, I will make dinner. lol

---

"it's the neck, it creaks under the weight of too much heavy thinking."

There are a few different kinds of superchargers, and the roots type that make power at idle are too large to fit into the engine bay of my car. There are several centrifugal kits that are designed for my car, but they use an impeller design (like a turbo, most likely the basis of your confusion)

Ah, got it. The Roots type blowers are the ones usually fitted to cars in the UK. The one that adds extra oomph to the Aston Martin is a Roots type. Didn't realise there were 'impeller' type superchargers as well. I take it these are driven off the crankshaft as well?

I can see how an impeller design (effectively a centrifugal pump) would have a lag associated with it - for much the same reason as that associated with a turbocharger. Turbos have had a LOT of R&D money thrown at them during the 80s and early 90s though, because they became popular on European cars for boosting performance (the Audi Quattro being a typical example of an 80's turbocharged car). And, of course, turbochargers are a feature of that silliest of cars, the Bugatti Veyron, which has no less than FOUR turbochargers sitting atop a truly incredible 8-litre W16 engine whose minimum power output is 1,001 hp. But if you're in the market for a Bugatti Veyron, then you're not going to be in the least bit worried about fuel bills or insurance ...


Panda Catfish fan and keeper/breeder since Christmas 2002