CyCloNe!

Wow Shawn nice data, looks like I got a new project to do. Shawn your on a role man all these neat side projects

User 52121

Relocating the air filter is on my project list for this winter. AIT's can get pretty ridiculous when idling in traffic on a warm day, or say when sitting in line at an Auto-X waiting for your turn to make a run. An awesome intercooler doesn't do you any good when AIT's are in the 160 range...

I was curious to know if the wall idea really worked. I'd be super interested to see if you had better/similar/worse results on a car that sat and idled for a while. Any chance I could convince you to repeat the test with a car that sat still at idle for 5 minutes at a time?

I'm hoping to work something out like George D did, with the filter relocated to the fender.

Dash01

Yep, that pesky scale on the left shows positive and negative pressure.

Bringing air in at the most positive points and exiting it at the most negative points gives the greatest advantage.

As a practical matter, best to inlet at the very nose (stagnation point aerodynamically) and vent it over the hood, where the accelerating airflow acts as a venturi to suck the heated air out. That would be optimum design for the intercooler ducting. Works like a fish gill, which is why the fish evolved this way over millions of years.

A ram air nose inlet for the intake manifold would give some positive pressure to offset or overcome internal drag. Not much, but every little bit helps.

333pg333

Good to see the old memory isn't quite dead yet. I mentioned NZ on that fb thread Shawn. Glad that someone found those links.

As for venting hoods, yes, this is not uncommon on many supercars and racecars.

<====== note avatar...

Scott H

That's a 928.

333pg333

The pressure graph should be pretty similar, but I think he was mixing up air in, not out. There is enough reason to believe that some of these vented nose panels might be counter-productive without an opening in the hood to relieve pressure...and, yes, I used to run one like this. :-)

eman930

Wow Idk how I mixed that up, sorry guys

refresh951

I think when sealed like NZ it will help quite a bit at idle. I will do some testing and let you know.

I like the avatar!

cas951

Ive done this test several times. I placed cardboard boxes around the Cone air filter blocking it from the engine bay and the "hot" Coolant reservoir tank. I tested during Winter and summer months.

Winter test City streets: 45 deg ave
At idle and at a stop light AIT rises instantly from 45 deg to over 120 deg. Once you get going it takes awhile for AIT to drop to the tempt you started with. I mean several minutes of continous driving. The more you stop the higher the temp reaches and the longer it takes to drop.

I also turned on my headlights to see how fast the AIT came down. In doing this AIT dropped really fast so vented headlight will definitely help.

Summer months: 85 deg average
While stopped the temp went up so fast and beyond my digital thermometer could handle. The temp wasn't able to display the actual temp.

This is your typical digital temp from Radio Shack that had dual temp and a long wire that I routed outside my drivers Windows to the engine bay.

Reimu

Some people get cool air from the fender well oem style
Would a 90 degree bend downwards be that bad?

86 951 Driver

This makes me think about how bad my open air filter is on my car. I am still running an AFM. I wish someone would make a cold air kit for a stock car.

I think it would be easy to run a filter in the fender.

theedge

Er, the stock setup was a cold air intake going to the fender well. If youre still using the AFM why not use the stock part to the fender well?

86 951 Driver

My car didn't come with a stock airbox. Also usually an open air filter makes more power unless it sucks in all hot air.

V2Rocket

I really don't understand how his setup fits without hitting the marker light and other stuff, I was messing around with intake paths in the same area and it's pretty tight right there...

User 52121

I don't either - it's definitely tight in there. I am just assuming his fits, I haven't seen it in person to verify. But even if you didn't do his exact setup, and pulled the tubing down lower and mounted the air filter behind the bumper cover up front or something....

It's something I'll mess with this winter when I get bored and start craving garage time.