Air Speed/volume Vs Hp

[Ghostrider]

I have just thrown this theory up in classics re FMIC mounting but this might be a better place for more open discussion.

Has anyone considered, or researched the air flow into and out of intercoolers vs potential gain or loss of horsepower?

As gas cools and I guess air is no different, it expands and therefore needs a larger volume of space to flow at the same rate/speed. If the piping in & out of the intercooler is the same my theory is that the air flow would bog down so to speak as the cooler air trying to exit the intercooler would require more space to flow the same as it was on entry and if a larger diameter pipe is used on exit but reduced to go into the throttle body, the air speed would increase (venturi effect) but volume would decrease creating a potential loss of HP.

Any ideas people???????

Cheers, D

[Adriano]

As gas cools, its density increases, and its volume decreases. Most intercooler plumbing is more than adequate for the flow, 2in nintercooler piping is enough for about 240rwkw at least without significant pressure drop across the piping. Nissan i think use 2 1/4 piping on the gtst standard( i think) so in theory that is fine for 300kw. The other way to think of it is standard gtr (3 1/4) or aftermarket fmic 3" piping is more than adequate for very high power, in 99% cases it would not be the limiting factor

[khunjeng]

cool air contracts not expands mate. Hot air expands as per the Ideal Gas law.

[Ghostrider]

cool air contracts not expands mate. Hot air expands as per the Ideal Gas law.

Not the way they approach exhaust gases.

Primarily why the exhaust piping after the manifold is bigger in dia than the manifold runners and the bigger the better in turbo cars.

Cheers, D

[khunjeng]

Not the way they approach exhaust gases.

Primarily why the exhaust piping after the manifold is bigger in dia than the manifold runners and the bigger the better in turbo cars.

Cheers, D

The Ideal Gas law still applies regardless of temp.

exhaust side is hot air which is opposite to the cooling at the IC which would seem fairly obvious.

[T04GTR]

no.. the air out of the "cooler" contracts and becomes more dence.

to get the same efect on the exaust side there needs to be a large quenching efect out of the turbo. ie a mild steel non insulated pipe. this creates a better pressure/heat diferance and therefor reduces lag.

[khunjeng]

no.. the air out of the "cooler" contracts and becomes more dence.

to get the same efect on the exaust side there needs to be a large quenching efect out of the turbo. ie a mild steel non insulated pipe. this creates a better pressure/heat diferance and therefor reduces lag.

lol