[bbnks2]

Originally Posted by sirdaft1

Keep in mind the one near the windshield is from the factory on the e46 m3. For the 335, turbos are on pass side and the DCI's pull from the drivers side, so any additional airflow will be a net win - especially on the heat soaked N54.

DCI's should be sealed and air should be drawn in from an area of hgih pressure (front fascia or cowl area). The only time open element DCI's will benefit from those vents is at idle... Once up to speed, hot air is going to flow OUT of those vents on the left/right. Cool air is not going to flow IN, lol. Only the very rear slots of those two side vents might start pulling some air pulled IN, but it will seriously conflict with the majority of air scavenging its way OUT and reduce the effectiveness (which is why I say they are a bit big).

The very base of the windshield (cowl area) is about the only area on the hood a vent will draw air IN. Unless of course you ram air in using a scoop that protrudes off the surface of the hood (like how an STI or EVO force feeds their top mount intercooler).

[sirdaft1]

Originally Posted by bbnks2

DCI's should be sealed and air should be drawn in from an area of hgih pressure (front fascia or cowl area). The only time open element DCI's will benefit from those vents is at idle... Once up to speed, hot air is going to flow OUT of those vents on the left/right. Cool air is not going to flow IN, lol. Only the very rear slots of those two side vents might start pulling some air pulled IN, but it will seriously conflict with the majority of air scavenging its way OUT and reduce the effectiveness (which is why I say they are a bit big).

The very base of the windshield (cowl area) is about the only area on the hood a vent will draw air IN. Unless of course you ram air in using a scoop that protrudes off the surface of the hood (like how an STI or EVO force feeds their top mount intercooler).

I'm sorry I should clarify. DCI's in general provide very little gain, it at all on an intercooled setup such as the N54. The rationale for hood vents in my situation is to have a place to vent hot air/heat soaked air. Of the three locations I mentioned, I would expect the drivers side vent to provide the smallest amount of net benefit as there is neither exhaust/turbos or radiator heat.

[Faredo]

I vented my passenger fenderwell and logged intake temps. Here is the post, scroll down for the log results.

http://www.n54tech.com/forums/showthread.php?t=46025

[335iguy17]

What is the picture with the green and red lines on the underside???