Scaff
Turbos work by using waste exhaust gas to force more clean air into the engine, the more air you can force in the more fuel you can burn the more power you can get. Its a very simple explination but it does the job.
Now as I'm sur eyou know air at different temperatures has different densities, cooler air being more dense.
If you can feed to the turbo with cooler, denser air you can improve the power output. An intercooler does just that, it cooler the air before it gets to the turbo, allowing cool dense air to be forced into the engine.
Have a look around the web for a more detailed explination, but the above covers the basics.
And on the web I found this little tidbit to add the technical to your very excellent explanation above... Truth be told, I think your explanation is more comprehensible
PV = nRT
It's called Boyle's law and it has to do with gas. This equation sets the relationship between pressure, volume, and temperature of a gas. One of the consequences of pressurizing gas within a set volume (as as what a turbocharger does) is an increase in temperature.
Add into this the temperature boost of something spinning at tens of thousands of rpm and you're blowing some hot air.
First, hot air is lighter (less dense) than cold air - hence the ability of hot air balloons to work, aka "heat rises". There are less air molecules packed per cubic unit hot air than cold and thus, less air per unit for the engine to burn. And, going back to our basic tenant, less air = less fuel burned = less power.
In addition, the burning of hot air (which already has inherent heat) is more uncontrolled within the engine's environment. Uncontrolled burning leads to instability of the gas/air mixture and introduces even further mayhem to an already violent reaction. The end result? Detonation. Detonation is bad.
This is where the intercooler steps in. In its essence, it's one of those straightforward things that does exactly what it's name says. It cools in between the turbocharger and the engine. And as superficial as we are here, it also looks damn sweet.
As for the specifics on what... where... you might want to check out the thread
here.

phattboy
