Let me explain this in simplist possible way (without throwing a lot of physics mumble jumble):
Intercooler is pretty much using air flow to cool down the air passing by the blades or tubes within the intercooler also by expansion of gases to bigger container will cool air down. Now you are already sucking normal temperature air from atmosphere, having air trying to cool that air down with same temperature air you are not going to cool that air that eventually goes into Intake
manifold down anymore than a regular Cold Air Intake
Now knowing that the air is not getting any colder to be any more significant than Cold Air Intake
, now we have to think about pipping length the intercooler is hurting the normal non turboed cars.
By adding intercooler on normal cars you are extending the Intake
pipe longer, now this is why it is hurting the performance of the engine. Think of it this way: Normal engine is basically sucking in air through these pipes, it is easier to suck air in with shorter pipe than long one. Good way to try this is get a straw suck through 1 straw is easier than sucking through 5 straws connected into 1 long straw.
Turbo charged or Supercharged cars need this because the turbo or supercharger increase pressure that action of forcing more air causes the air to heat up, by adding intercooler it allow that heat up air to cool down without decreasing volume of air going into the engine. Now having longer pipe length also hurt turbo, but not as much as normal engine because turbo is basically forcing more air into engine so engine is being forced fed air so it will not losing performance. Having longer pipe it is making turbo work harder to force that air to the engine so the turbo perform not as efficiently with longer pipes.
Wow this explaination went longer than I expected
Hope I do not have to reiterate this again with next person with same questions
Hope that answers your questions [ 03-21-2003, 04:41 PM: Message edited by: Mike Lu ]