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Old 10-24-2008, 01:03 PM   #1
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question about drag racing

I was wondering about some of the aero they use on drag cars and applying it to mine.

some drag cars (top fuel cars) have a parachute on the back. right above the parachute is a lip on the back of the car that extends a good 8-12 inches past the back of the car. is this protection for the parachute or is it aero?

I saw a while back where someone had added a piece of plexi-glass to the back of the car using really strong magnets and was getting better FE.

I was thinking that I could cover my entire trunk lid and leave enough material to over hang the trunk by about 8 or so inches. use maybe 1 or 2 screws to hold it down (along with double sided tape for the perimeter) paint it white and that way my trunk is still functional.

if this is stupid or won't work, someone let me know before I make my car look really funny for no reason. I don't know a lot about aerodynamics so I am really reaching out there with this one.

thanks
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Old 10-24-2008, 01:28 PM   #2
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Should work to detach air cleanly from the rear of the car. Some might have it angled a touch if they need downforce on the back. Probably don't really need more than about 3 inches for it to be effective.
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Old 10-24-2008, 01:40 PM   #3
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I can't address the aerodynamics of this piece, but I suspect it is irrelevant. In drag racing, aerodynamic drag is essentially irrelevant anyhow. (Aerodynamics does play other roles, such as creating down force, but the aerodynamic drag from those items will not really affect ET or MPH - even over 200 MPH).

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Old 10-24-2008, 01:40 PM   #4
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roadwarrior,

I have a spoiler on the car now (factory) which houses the 3rd brake light. my trunk actually slopes down and the spoiler sits above it. I was thinkin that by puttin the plexi over the entire thing would make it sit almost completely level.

would you think that more length would be better/worse/not matter at all?

bob,

the fact that is in drag racing wasn't that important other than the fact that I could relatively easily depict it that way (didn't know how else to describe it). I had hear of people doing things for air separation. I thought about removing my spoiler and leaving it at that but that would leave my trunk with an easy slope downward to my bumper (which I have heard is bad). it was just a thought and I am playing around with the idea because it would be relatively inexpensive and simple to do.
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Old 10-24-2008, 07:11 PM   #5
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Drag racing spoilers are not for aerodynamics

The spoilers and wings on Top Fuel and Funny Cars are not for aerodynamics they are fro down force. The wing on a Top fuel car is supposed to put 7000 lbs of downforce on the rear of the car to keep the tires from spinning. Even at 330 MPH and 7000 lbs of downforce they can still blow the tire off if the clutch comes in too much. They have some awaesome power.
Now Pro Stock spoilers may be more for aerodynamics?
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Old 10-24-2008, 10:17 PM   #6
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curly,

you're right. I got the cars wrong. I did mean the type on pro stock cars. that was what I was trying to portray, not the wings that give downforce.

they come straight and level out from the car about a foot, no angle to them (or at least not much of one).
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Old 10-24-2008, 10:59 PM   #7
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It doesn't seem like it would create much downforce, I'm guessing it would help with aero a bit? I cannot say, I don't know enough about the subject to say for sure.
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Old 10-25-2008, 02:58 AM   #8
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Old 10-25-2008, 07:44 AM   #9
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that is exactly what i am talking about though mine would be more flat and not with the upward turning lips on the sides of it.

thanks cow man
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Old 10-25-2008, 08:09 AM   #10
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this is the area in question. I have also been giving thought to a cam back for the back glass. the aero on my car is actually pretty good to start with
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