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Thread: N55 Intake Idea
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Old 09-30-2012, 07:40 AM
Needsdecaf's Avatar
Needsdecaf Needsdecaf is offline
Everything's Bigger in TX
Location: The Woodlands, TX
Join Date: Sep 2006
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Mein Auto: 2007 MDX
1. Why would the N55 be more sensitive to changes on the cold side? And what do you even mean by that?

2. These types of intakes are only beneficial if your turbo is causing negative pressure in the pre-turbo intake while boosting. To see if this will have an effect, you need to do some manometer testing on the intake along several points. Otherwise, all you're doing is marginally cooling down the intake air and letting more sound out.

This setup is actually pretty stupid. There is no need to add a filter on the end of the secondary intake hose. In fact, you're defeating the purpose of this hose. The hose should ideally face forward in the front of the valence with a scoop to collect air while driving. The idea is to pressurize the airbox with as much air as possible to prevent negative pressure. Adding a filter here is redundant and counter to the original purpose.

Here is a better setup. This was from my Volvo days. Not my pics, but I had a similar setup. Another engineer and I did extensive testing to see gains. Even running a tune with 21 psi of boost, it was less than you would think.

2011 535i
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Last edited by Needsdecaf; 09-30-2012 at 08:04 AM.
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