hi all, this might sound stupid but i still gonna ask!!!

Why do we need intercooler? The inlet air is coming from the air box or induction which is cool anyways. The cool air from outside goes in to turbo then through intercooler and into engine. what is the point? Is it because when it goes into turbo it becomes hot??!

 

Yes, heated by the turbo, which is heated by the exhaust gases spinning it.. etc..

 

The exhaust gas temperature can exceed 900 C when running part throttle closed loop, even on full throttle the exhaust gas temperature can exceed 850 C. This puts a considerable amount of heat into the turbo casings, combine this with the fact you are pressurizing the intake air, and it's easy to see why the air gets so hot. In fact the post turbo compressed air can be well in excess of 100 C, this would have a very detrimental to performance if not cooled in some way, hence an intercooler, the more effective the better……

 

The compression of air caused by the fast rotating compressor wheel (100-150krpm) and the small clearances to the inlet casing profile also generate vast amounts of the heat due to the 'squashing' effect of the air

Cheers

 

Adieabatic compression. (spelling probably wrong)

Take a fixed volume of gas and compress it, the heat enery is the same but in a smaller space, therfore the temperature of the gas is now higher, add physical heat transfer and the energy imparted into the gas by friction and it gets hot.

Now heat tends to counteract the compression process, in the I/C, the temperature falls and thus the static pressure tends to fall as the density increases. As a result more air flows.

 

Thanks to you all.

Now I understand a lot more. Defo get a bigger IC when i upgrade mu turbo. Will get ic spray too!

 

Im picking up an STi shortly when my current cars sold which has the I/C spray button.

Is there any real use/point of this or is it basically fit on to the Prodrive model for the homoglation (spelling) of the rally car?? Never bothered with it on the test drive as i dont really know the circumstances it should be used in?