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I have the same issue so i turn the wheel when backing out and sometimes I catch it right and no scrape.At any rate,the only thing scraping is the black plastic thing under there that is supposed to scrape to protect the car anyway!It's a cheap replacement part if it ever needs replacing.
I scrape backing out only too. Has happened in two different driveways. It happens no matter what kind of angle I try and I've tried them all. Oh well, it's no big deal really. I just hate when it happens and any neighbors that happen to be out are staring at me like I'm destroying something on the car.
The Corvette has an air dam that actually comes in 3 pieces. That is the plastic piece you see under the front between the tires. The air dam is designed to bend to the rear as you drive the car. When you pull into a driveway it simply bends so you don't hear the scraping. When you back our of the driveway this causes the air dam to "rub against the grain" ... so you hear the scraping.
There are 2 plastic pins (one on each side) that connect the 2 side pieces with the main front piece. The pins are cheap and easy to replace - however unless you fix the driveway you will always scrape and be breaking the pins.
just a guess...but I believe the air dam under the front end will bend backwards when pulling in. However when you (we) back out of the driveways it does not bend forward. Therefore you hear the scrap sound. Just guessing!!
Driving into the driveway I rarely ever scrape either. But I have the same problem backing-out and here's my theory about it and how I avoid the "reverse" scrape (most of the time).
My thinking is when I approach there is no springing of the suspension going in (at that low speed the car is steady-state). The suspension gets into the act when the front tires begin to roll up the driveway but by then (due to the ovehang) they have pushed the "scraper" up enough to avoid the scraping noise.
In reverse however, the suspension gets into the act and the car "jiggles" ever so slightly (it helps to lessen the problem to set suspension on "Sport" not "Tour") and as the tires drop off into the street there is a bounce that makes the scraping part "scrape".
Anyway that is how I visualize the thing.
Like others have said it helps to pull out very slowly and turn nearly full lock so the car is as close to parallel with the driveway as the width of your driveway will permit. At that acute angle I rarely never have a problem scraping.
It helps if you're thin like me I guess and if you have a passanger or carrying too much weight then this wont work.
My homeowner's association won't let me alter anything but that's another story...
Buying a new house...when I enter the driveway, no scrape...when I back out, I scrape...WTF? Any maneuvering tips???
Same problem here, I found that backing out at a sharper angle pretty much eliminates the scraping issue. The only part that scrapes is the replaceable air dam under the front end anyway, about $100 to replace if I need to.