O and that ferrari has 2 wheels off the ground...I would call that some good stick.

 

here are some pictures of dereks car...
scroll down a bit and you will see the yellow civic..

LINK TO KRAZIK'S PICTURES

 

The Ferrari with two wheels up probably isn't -- at that moment -- generating any downforce at all with its underbody kit. Aside from the belly being at a severe angle, it's a low speed corner. Without really serious airflow, channels and a diffuser don't do anything.

At speed, though, the setup is probably very effective.

The same pieces on a street-driven car would be higher up and much more vulnerable to body roll, and probably wouldn't be very effective at all.

What I see on Derek's car are front and side curtains (and probably an aggressive splitter lip). All of that stuff will definitely help at the track -- but it's not the same thing as a true underbody setup. Keeping air from getting under the car creates a lower-pressure zone which pulls the car down. An underbody treatment is something else: it uses compression, channels and a diffuser to manage air speed (and density, sort of) to create a low pressure zone.

You can't have both, ultimately. If your front/splitter comes down too low, you won't get the high volume of air under the car that you need for an underbody package to work. You can see the elevated intake on cars with functional underbody setups. Ultimately, an underbody setup is capable of much more than air curtains and a deep splitter, but it's much less flexible in terms of its operating environment -- meaning distance from the pavement and position relative to that pavement. What Derek has is more practical for a production car. (Although he's not going to make it over the curb and into the driveway, is he?)

 

I can't remember what the underside looked like but I know that front splitter/bumper goes all the way past the front wheels...about where your feet would be..

 

You posted pics of ALMS GT2 cars. Post some pics of Ferrari Challenge cars and the F430 racing in Grand Am GT.

 

why dont you post some pics of your cars billy???

 

billy doesn't have a family. He's a car john, his cars are all whores.

 

McBeath's book had a discussion about why that is important -- splitters are affected by the airflow under the entire first third or so of the car.

 

Here's an interesting car that sort of applies to what we're talking about. Lotus 88... had 2 separate chassis, one inside the other, with the outer chassis basically being nothing but the bodywork, connected straight to the suspension uprights.



http://www.f1technical.net/f1db/cars/473

 

You mean i'm the pimp to all the car whores?

I think i'm a whore to all the cars is a little more accurate...

Here are some pics of a Ferrari Challenge car that have stock undertrays and diffusers that again, make a noticeable difference when cornering (not just a marketing scheme or only works in a straight line). Here's from this season, some of them I work with:





I dont have any pics of the F430 in Grand Am, but it too has a relatively stock body (more so than the ALMS bodywork in previous pictures), but other than the bodywork, undertray, and diffuser, as well as the drivetrain, it dosn't have anything else in common with a real Ferrari. But it does have an advantage as its the only GT car with a functional diffuser, and many of the Rolex GT teams are making a tiffy about it.