JBreckeen

Hey all . . .

I have a 951 racecar and have been in cooling mods mode.

One of the thoughts I have had was the little cooling slit in the nose section for the intercooler; but after reading some posts on the subject, I understand that it does not work as advertised.

But what about opening up the large area on the front bumper-cover that is in front of the radiator - the part that holds the front license plate. It seems to me that would allow a ton more cooling air into the radiator, as well as the intercooler.

Yes, I can imagine that this will create more drag, but living in South Florida and pushing hard in 100 deg heat makes my engine and underhood temps a bit uncomfortable.

Have any of you all done this? Does it sound like a good idea? Yes I would put a mesh screen in place to mitigate rubber and FOD intake . . .

Thanks in advance . . .

JBreckeen
88 951

Reimu

Can you put a vent in the hood? Supposedly some of the best cooling comes when you give the hot an air exit 968 turbo-style

tman

I did this to my bumper cover, also have some vents on the hood for hot air to exit. I can post pics when I get home.

Dougs951

Aribops old car

ideola

The 951 FMIC will benefit significantly from a low pressure duct installed in the hood. IFC make a replica of the 968 low pressure duct. By one account, the efficiency of the IC was improved to 80% after installing a low pressure duct, albeit a custom version.

lovemyp-car

http://www.texasperformanceconcepts.com/LSXLTX.html

bottom of the page...

something like this might help by reducing the restriction of air coming in from the front...i would suggest some sort of vents in the hood like the ones d9 sell, they should help pull some more air through the engine bay

ritzblitz

Ive seen people modify the same section Dougs951 posted with a large hole saw. Good looking results for a track car.

ZR8ED

My understanding of front end aero, is that proper ducting/air exit is far more important than the size of the opening. Ever see the front rad opening in Nascar?

I have actually reduced the size of the opening to my rad. What I did though is make sure that ALL of the air that comes through the opening has to go through the rad. I blocked off all other openings that air could bypass the rad. I used sheet aluminum to create this ducting. It made an noticeable improvement, in reducing front ent lift, and cooling effectiveness. I am able to run in town without my electric fan. (as long as I don't sit at a light too long). On longer cruises, I don't even turn it on. As another observation, my hood used to quiver slightly on the highway, and now it is nice and still, even beyond normal highway speeds.

BTW this work is not on my 944, but on my Datsun Z car, that I have built for having fun on the track. The theories translate to all vehicles though.

I would look closer at directing (ducting) the air to the rad first, before opening up a larger air intake. From what I recall from our wind tunnel testing/research was that an opening of less than 4x12 is plenty for all but strictly highway stop and go commuters. Dedicated race cars can get away with slightly less opening.

Scott.

ritzblitz

You mean like this?



The one important thing which hasnt explicitly been mentioned is the pressure differential across the radiator. Your ducting can be awesome going to the radiator, but it's got to be good coming out as well for optimum performance.

tman

Tough to get a decent photo with all the reflections but you get the idea.

Attachment 420590

JohnKoaWood

And his new car in the same picture!


I was thinking of having vents cut into my hood sometime soon... MMMMMM more things to think of doing to my car.... mmmmmmm

944CS

I wouldn't do this if you are using the stock intercooler. I think even a vented nose panel is a bad idea.

If you want to prevent high coolant temps, control the heat in the exhaust pipes. This will have many positive side benefits, one being better aerodynamics, two being better looks.

Dougs951

More pictures please!!!

and maybe a bit of documentation...


if you dont mind.

ritzblitz

You kinda lost me here pal... care to explain?

JohnKoaWood

I think he is recommending we route our exhaust from the turbo straight up out the hood....