Would this gain any additional HP?, true ram air Options

[erics1one]

On a NA car, and using the Apex I intake, you think this setup would gain more HP than the standard CAI?



This post has been edited by erics1one: Apr 22, 2005 - 11:41 AM

[orvillescelica]

Like i stated, it will cause positve pressure, but nothing of any significance that will increase HP. If you want to do the numbers yourself, i simply used the basic isentropic flow relations assuming that the stagnation pressure will be intake pressure. That is actually a very very bad assumption since the flow is not going through the intake head on, but through a filter, then through a length of pipe. Even the use of the isentropic relation is not accurate since there is bound to be heat addition as the flow goes from the filter to the intake manifold past the engine. But if you want to crank the numbers modeling this as a 2-D, adiabatic flow problem, then be my guest.

Im not saying it wont increase performance, because my bet is it will. But it will be a more effective CAI and thats it. Since you are getting intake air directly from outside as it is moving, it will be much cooler than any air that you will find in your engine bay. But you dont want to 'trap' air and try to force it through the filter. Any trapped air will loose velocity and thus be subjected to heat transfer from the engine, or any part of you car. If you keep the CAI in a moving air flow, as race teams do, then you will be getting intial intake air at standard atmospheric temperature, unsubjecated to any heat transfer before entering the filter.