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Old 04-24-2012, 07:24 AM   #111 (permalink)
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where your going

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Originally Posted by Piwoslaw View Post
I'd try driving it backwards, without any lips or spoilers.

Looking at how the PT is low&narrow in the front and tall&wide in the rear, I suspect that whoever designed it had mirror-vision.
Have to say the quote about what matters is , was great will use continually !

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Old 10-25-2012, 12:13 AM   #112 (permalink)
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Was asking my brothers about his. Brother in TX believed that his Downward Foil above the rear window kept the window clean, and help slightly with the MPG. Lost the data.
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Old 03-28-2013, 08:05 AM   #113 (permalink)
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How about this spoiler? I recently removed mine to see if there is any noticeable difference, but unfortunately I did this along with some other modifications, so I'm not sure if the spoiler alone decreased gas mileage. It looks really good on these cars. What do you think, function or style?
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Old 03-30-2013, 12:52 PM   #114 (permalink)
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Originally Posted by Superluminal View Post


How about this spoiler? I recently removed mine to see if there is any noticeable difference, but unfortunately I did this along with some other modifications, so I'm not sure if the spoiler alone decreased gas mileage. It looks really good on these cars. What do you think, function or style?
I'd leave it.If is doesn't impact mpg,it will help mitigate hydroplaning in a rain storm.
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Old 05-13-2013, 10:16 PM   #115 (permalink)
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Is the Cobalt front-wheel-drive or rear-wheel-drive?
Cobalts are usually front wheel drive- a Bonneville one may be rear.

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Originally Posted by Daox View Post
The only spoiler which helps is one which helps to maintain a teardrop like shape to the profile of the vehicle.
I thought some that raised up a little, when from the trunk, can help.

I am rather curious about mine, but I wouldn't replace it. The only thing I would do would be to remove it, and replace it with one of these:
http://ecomodder.com/forum/240142-post67.html
(Now that I found this, I am going to start researching it (the thread, at least))

Is this accurate?
Aerodynamics | Ministry of Wheels

It looks like my rear end, and my spoiler. I am more so curious- its not as important. This kind of modification would be 6+ months or so down the line.
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Old 05-13-2013, 11:14 PM   #116 (permalink)
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Most rear-deck spoilers only become 'effective' at speeds of about 100 mph or greater, and if you're driving at that speed you're obviously NOT worrying about fuel economy.
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Old 05-13-2013, 11:45 PM   #117 (permalink)
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I gotta do something about my Magnum's rear spoiler, I think. I noticed two fairly fast-spinning vortices behind me, the last time I drove down the interstate in a rainstorm. Not especially a good sign.
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Old 05-14-2013, 07:00 PM   #118 (permalink)
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Originally Posted by Old Tele man View Post
Most rear-deck spoilers only become 'effective' at speeds of about 100 mph or greater, and if you're driving at that speed you're obviously NOT worrying about fuel economy.
What post is this a response to? Mine, Superluminal, or someone else?

I am still curious about the link I posted regarding a spoiler/lip potentially being helpful- if anyone thinks mine fits that. I looked a bit into the alternate spoilers, basically flat, but I did not learn much.
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Old 05-14-2013, 07:24 PM   #119 (permalink)
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General statement (based upon actual instrumented road test data).
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Old 05-15-2013, 01:23 PM   #120 (permalink)
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Quote:
Originally Posted by Old Tele man View Post
General statement (based upon actual instrumented road test data).
Ah, okay.

Quote:
Originally Posted by UltArc View Post
I thought some that raised up a little, when from the trunk, can help.

I am rather curious about mine, but I wouldn't replace it. The only thing I would do would be to remove it, and replace it with one of these:
http://ecomodder.com/forum/240142-post67.html
(Now that I found this, I am going to start researching it (the thread, at least))

Is this accurate?
Aerodynamics | Ministry of Wheels

It looks like my rear end, and my spoiler. I am more so curious- its not as important. This kind of modification would be 6+ months or so down the line.
I was hoping Darin would chime in, I think he is one of the individuals who mentioned that a slight upword lip (like the diagram, or my vehicle) can have a positive affect. I wasn't able to get anything from the other forum on the flat/bonneville style spoilers.

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