16valver

My nose panel was backed into a while ago and now looks like ***... I've thought about making it a donor for a DIY vent job.

I'm curious if there is any point to doing this on an NA. In my case, the S car DOES draw air from under the nose panel with the stock air box, and will also draw air from under there when I get the S2 manifold on.

I'm more curious about the physics of the whole thing. If anyone has any numbers and info on negative vs. positive air pressure, what the intake system likes and just the practical uses of the whole deal, I'd love to hear!!

I suppose it could provide cooling to the engine bay, but my hood is not vented and likely never will be, so I'm not convinced it would make a huge difference.

Aussie944S

I've been thinking the same thing, I recently removed the plastic piece that covers the holes in the frame above the radiator and did a little panel beating to the nose panel so that the gap at the bottom was slightly larger. Its not noticeable and doesn't look weird.
I have also been thinking of doing the cut outs on the air box.

Keep us posted on what you do.

Triple_T

This has been posted here before...but I couldn't find the thread
http://www.autospeed.com/cms/A_2162/article.html

16valver

Will do!!

I was wondering if this has been touched on here before. Search didn't yield any numbers though... Thats a good link! I wonder if anyone has measured the nose, hood and windshield pressures of our cars?

Time to start thinking numbers. I'll plan to start a better understanding of exterior vs interior air pressures and how they can work together.

MAGK944

Yes & getting air IN AND OUT of the engine bay from the low pressure area directly outside has to be a good thing.

mopar bob

For a turbo yes but on a S2 I don't think so. If you do a air box mod on a S2 ( 4 large hole on the lid) the turbo nose sends air straight into the air cleaner and the 924 turbo header sends it in a little high and hurts the air flow over the car.

MAGK944

Oh, i thought we were discussing getting the hot air out of the engine bay rather than getting more air into the filter, my bad.

16valver

I did have more air flow for the engine in mind, but I encourage all ideas and concepts on the subject. All this stuff will likely go hand in hand.

MAGK944

The vented nose panels were fitted on our street cars to divert more air to the intercoolers. If you look at what Porsche did to the 968 Turbo RS you will see that that they also added vents to get that extra air out. I would surmise that on any model its just as important to get are out, ie: provide airflow over the engine, as it is to get the air in there. Hot air rises and will sit under the top of the hood so providing a flow of air from the front to the rear of the hood will definately cool things down. Cannot hurt reducing underhood temperatures.

Lilja

Ive been told by people who apparently knows about these things that the vented nosepanel creates turbulence from the air that is normaly past into the intercooler from lower down.
This creates an underpressure infront of the intercooler thus making actualy less air going through it than with the stock configuration.
Hence we arent using it on our racecars.
An important thing to also remember is that since the 924 Turbo had the vented nosepanel but no intercooler, and the 951 didnt. It must mean that Porsche of some reason thought it was worse with it, or didnt think it was necessary.

Cole

Sometimes its just a cost/benefit thing or simply styling.

It may have helped, but simply not enough to justify the extra dollars or change the way they wanted the car to look.

Mine was the victim of a bad repair. The nose panel was actually welded to the fenders. I had a hard time finding a good stock replacement so went with the available, lighter, vented panel. Looks cooler and gives me options in the future.

MAGK944

Could even be that the 924T needed extra cooling air in the engine bay, whereas in later models they modded the undertray to suck air up. Difficult to say the reasons but I doubt they spent money putting on vents just for looks.

Cole

Maybe. They may have done the vents to help distinguish the 924t from the 924. Just like the 951 got an entirely different front end to distinguish it from the 944.

Who knows if the car "needed" them or not

azbanks

That whole series is good.

Reimu

I doubt you'll see much improvement if any. These cars have pretty ok air intakes as it is

But diy inlets can be fun too, in my case it was more out of necessity