ghoffman

The first 1 is Chris exiting turn 8, and the next 3 are in the turn 5 area. In these pics, "white" is hotter, and you can really see the brakes and the whole back end of the car is really hot. It looks like the rear might be catching alot of trapped air. Obviously, I wish I had more focal length to see tire temp profiles, but on the other hand, if it had a really short focal length and we mounted it in the car looking at the tires from a foot away, we could see the temp profile while in the corner. It was an interesting experment anyway.

gpm30236

that is cool , thanx for sharing

Falcon

Gary, is the heat in the rear of the car because the exhaust is causing high ambient temps?

Good pic, BTW.

AUTO_X_AL

Very interesting. Thats a really cool new perspective.

ghoffman

I am not sure, but I think it is a combination of that plus all of the air that comes off the coolers, radiator hot air under the car that gets trapped. It would be interesting to see a W/C car with the very vented hood versus a non vented stock C5 like this.

95jersey

I pull out the rubber strip that seals the hood up by the firewall at the track. I know this works because I see much less hood lift at 150mph. I would think a cowl hood would work as an alternative as well.

ghoffman

I thought of that but in T1 you can't really do that.

BrianCunningham

Cool stuff.
Next time you at the track, you'll have to see if you can get pics of someone w/o the coolers.

It shows how much heat is coming off the transaxle

UstaB-GS549

I just bought used pads from Chris...

maybe I should have gotten pads from someone who doesn't brake so hard.

Kschwamy

Very

MJM

Gary,

What is that, a Litening pod you're using? Ha ha

Matt

ghoffman

No, but I worked on that at Northrop! This one was about the size of a orange juice can. It was a borrowed device, glad I did not lose it, I couldn't afford it!

vms4evr

Are the T1 cars allowed to remove the license plate assembly with the backup lights in it? With just a screen there like the WC and other cars you might see a nice tail of heat escaping from the exhaust and coolers.

As a test I'm going to remove that assembly when I get down to Roebling. Someone mentioned that the back end of the car acts like a parachute and removing that assembly would help the aerodynamics of the car. It's a cheap experiment.

ghoffman

That sounds very reasonable to me. Perhaps you could put your trans/diff coolers there with some big fans pull the air out.

Slalom4me

From here

.

wtknght1

Nope.

Solofast

Actually you want the area in the back of the car to be stagnant.

If you vent the area in the back of the car, (like thru the license plate) you reduce the area that the pressure is working on, but you increase the airflow thru a higher loss path. It is the same logic that applies to a spoiler on the front of the car. It increases the stagnation area in the front of the car, but it forces more air to take a lower loss path around the car and the net effect is lower drag.

Similarily, you don't want to take the hood strips out, because that will increase the leakage out from under the hood and it will result in higher drag. Maybe lower lift, but certainly higher drag...

The rear valance in our cars does hang down and could have a "parachute" effect, but I doubt that very much. The reason is the folks at the General spent a lot of money in the wind tunnel (witness the smoothing of the underbody at the back of the engine compartment) and I'm pretty sure that they would have made sure that wasn't happening. If you want to reduce drag back there, make sure that the leading edge of the valence is "rounded" and not like a scoop, and you will have done about all you can for that part of the car...