josserman

Thanks! OK it sounds in general like as long as I seal up the hole in the bumper and it just goes to the intake I should be fine. Thanks guys!

iLuveketchup

Do you have cut holes on your OEM hood? If so, your not venting any heat regardless (unless you are parked).

spdracerut

I would make a rectangular airbox to put in a big flat panel filter and then use a NACA duct to ram air it.



http://www.motoiq.com/MagazineArticl...r-Testing.aspx

You can probably buy a generic/universal NACA duct and mount it in the middle ala Dodge Viper style.

josserman

I thought the holes in the hood would vent the heat, especially with the bottom closed off from the splitter?

josserman

This looks great!

SlowTeg

I haven't seen anyone do testing on just vents cut in the hood, I'm sure it must help some. I think even better though is having louvres in the hood so there's an area for the hot air to rise and escape. Picture air flowing over the top of the hood. It's not high pressure but if the air is flowing fast enough it could be enough pressure on top of the hood to not allow air to escape. With louvres you create a low pressure zone that encourages scavenging air from the engine bay.

Take a look at spdracerut's article, I found it very informative. There are/were a few threads that discussed hood louvres and vents and aerodynamics in general in this section.

spdracerut

Correct based on testing by Gernby
https://www.s2ki.com/s2000/topic/877...t__p__20812917

"I have hood vents, but they are ONLY for looks, and actually increased my engine ccolant temps at the track. I have only 3 vents cut on the passenger side, and my coolant temps went up to 225F at a track day last year. Another S2000 owner at the same track event hit 250F with his hood vented with the 4 smaller vents near the windshield. "

If you look at the hood from the side, the back of the hood at the windshield is the highest point and the front of the hood the lowest. Therefore, when people cut holes in the hood, the leading edge of the hole is lower than the rear edge. So looking from straight ahead, the air has a straight shot into the hole. So air goes into the engine bay through the holes, creating a higher pressure zone in the engine bay behind the radiator. The higher pressure zone now in the engine bay behind the radiator reduces the airflow through the radiator reducing the effectiveness of the cooling system.

That's my theory at least and explains Gernby's results

josserman

Wow this really throws the whole design off! I wonder if I had some sort of fin in front of each hole if that's would help block air from coming in.

josserman

So just a thought...what if i used the first hole as my intake duct into a closed box out to the charger. Seems that's the hole that would be sucking in the most air. Then added some sort of fin for the other 2 holes so air when moving wouldn't be forced in the them but instead could escape?

Obviously this is all crazy theoretical with 0 scientific backing but just logically it may make sense? On this route though should there be any concern to uneven downforce only having fins on one side?

Topplayer

what about getting a mugen hood and added something like this? could this be a good alternative?
http://circuitgarage.bigcartel.com/p...-hood-diffuser