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C5 headlight drag

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Old Mar 8, 2017 | 02:02 AM
  #1  
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Default C5 headlight drag

This might sound goofy but I am just curious if you feel a difference if you pop open the headlights at 120 mph. or more or if the damn things just fly off
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Old Mar 8, 2017 | 07:55 AM
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It's my understanding that the motors don't have enough power to overcome the force of the air passing over them, to open the headlights at speed.
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Old Mar 8, 2017 | 09:33 AM
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I think I read its the equivalent of dragging a 200 pound weight on the back
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Old Mar 8, 2017 | 09:33 AM
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I have run 100+mph with the headlights open and closed. Didn't feel a difference in "drag" so to speak, but there was a slight increase in wind noise.
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Old Mar 8, 2017 | 10:10 AM
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According to a google of the question.super Chevy magazine,did just a test.using 1 thru 6 generations of corvettes. At a wind speed of85 mph.the coefficient drag on a c5 with the headlights up is 7.70 hope that helps.
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Old Mar 8, 2017 | 10:21 AM
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Running 120+ mph at night with stock headlights?
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Old Mar 8, 2017 | 10:27 AM
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Originally Posted by leadfoot4
It's my understanding that the motors don't have enough power to overcome the force of the air passing over them, to open the headlights at speed.
That's not true, they actually fly open more quickly when at speed. As soon as the "lid" cracks open the air grabs the overhang of the cover and whips them up. They do go down a bit more slowly as well when at speed (70+)
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Old Mar 8, 2017 | 10:32 AM
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Old Mar 8, 2017 | 10:33 AM
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Didn't feel any drag
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Old Mar 8, 2017 | 11:29 AM
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My vette wouldn't go any higher than 175 with the lights up.. I know it can do better with them down (Full bolt-ons)
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Old Mar 8, 2017 | 02:02 PM
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I did 200mph with them up, didn't have any issues.

Car mad ~700rwhp for reference though.
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Old Mar 8, 2017 | 03:34 PM
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Originally Posted by Drewstein
I did 200mph with them up, didn't have any issues.

Car mad ~700rwhp for reference though.
Based on my calculations, that's pretty fast.
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Old Mar 8, 2017 | 09:01 PM
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Just don't stick your arm out the window or the car will slow down and go into a spin!
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Old Mar 8, 2017 | 09:24 PM
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140+ on a closed airstrip. no noticeable difference...


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Old Mar 8, 2017 | 11:05 PM
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Originally Posted by c5vetteguy
Running 120+ mph at night with stock headlights?
Hell no, I wouldn't try it at night, I was just curious how it feels when you open them at that speed if it feels like a speed brake or something equivelant or if they would even actualy open period due to something computerwise to protect the system.
When they just pull a piece of tape of a car going close to 200 at Daytona makes a difference for them I figured something like our headlights would be even more dramatic.

More than likely I'll probably never even get to that speed to begin with to find out for myself, I know I'm not what I used to be and I'm not
going to kid myself knowing my reactions aren't as fast as they once were and I don't want to end up in one of those disaster videos on Youtube.
But I love the car, it's the most fun one I've ever had since the 60's.
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Old Mar 8, 2017 | 11:10 PM
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Originally Posted by nsogiba
That's not true, they actually fly open more quickly when at speed. As soon as the "lid" cracks open the air grabs the overhang of the cover and whips them up. They do go down a bit more slowly as well when at speed (70+)
Thank's they are interesting facts, just that 70 part tells me something
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Old Mar 8, 2017 | 11:17 PM
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Originally Posted by Trkdrvr
Didn't feel any drag
But did you start out with them already on. I'm wondering if you can feel a slight difference instantly when they pop open at that speed
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Old Mar 8, 2017 | 11:19 PM
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Originally Posted by Drewstein
I did 200mph with them up, didn't have any issues.

Car mad ~700rwhp for reference though.
I think you just might have enough power to make up the difference if there actualy is one
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Old Mar 9, 2017 | 06:59 AM
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It's entirely subjective, but my Butt-O-Meter swears the damned things are like air brakes. That, and they're just ugly. The car is soooooo sleek before you open them.
That's why I got rid of them.
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