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Old 05-22-2012, 03:04 PM   #81
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+1

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Originally Posted by vehicular View Post
that looks great! You're going to have to make a digital pattern for the rest of us bums to copy!
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Old 05-22-2012, 03:30 PM   #82
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Also LOL at the stretched cloth idea. I had been thinking about trying that as well.
was is that lol? that's the base of a lot of fiberglass projects.


for example:







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Old 05-22-2012, 03:32 PM   #83
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I made a quick fastback from the plastic alloy composite material. Took about 1.5hrs to come up with the design, cut it out and bend it.
Lol, I like the way you make things sound so simple. I was hungry today, so I made a quick sandwich.
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Old 05-22-2012, 05:25 PM   #84
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was is that lol? that's the base of a lot of fiberglass projects.
No not LOL at the idea, LOL at the fact that he had the SAME idea I did. Custom speaker enclosures just like you showed were the source of my inspiration.
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Old 05-22-2012, 06:48 PM   #85
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I was a tiler for 15 years, so marking out and cutting the shape accurately is not too hard for me. Tip- use masking tape to draw a line on the trunk where you want the hardtop to finish, on one side only. Then find the centre and make marks at 100mm from centre out at the back edge of fastback, and the front edge. Then just measure how long the distance is. I will attach this with race tape. But you could use hinges on the top, and bonnet pins on the back.
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Old 05-23-2012, 12:28 AM   #86
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That is a seriously good idea. Maybe extend it back to the end of the trunk or even beyond and attach it with hood pins.
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Old 05-23-2012, 01:06 AM   #87
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I didn't want to make it go past thing wing stays on this car. On the nb fastbacks we will have them go back much further. But I wanted to see how this angle works anyway in regards to attachment and flow.
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Old 05-23-2012, 03:01 AM   #88
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Unreal. !!!

A couple of questions.

1/ What did you use to bend it with ?

2/ Are you going to run a plexi window in the back there or just have side mirrors for rear view..?
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Old 05-23-2012, 03:33 AM   #89
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If I keep it on the car I might run a back window with some air guides either side of it. I bent it by standing on it, bending it over my knee, etc. That is what takes the time. I could keep working on it, but it is fine for test piece. Just made a vented hood too. Will post pics later.
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Old 05-23-2012, 05:35 AM   #90
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I cut the hood vents along the frame. Just makes it easier than cutting thru the frame in odd places.





I will still have to cut all the triangle shape pieces and rivet the to the sides of the vents.

Seems like i have taken over this thread, so no more updates from me.
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Old 05-23-2012, 07:29 AM   #91
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That i like.
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Old 05-23-2012, 08:51 AM   #92
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Nothing revolutionary, but here's my contribution.

Hood vents:


They work.


Cut bumper:


Also, as you can see in the first picture, I have a single wiper with a center rest position.

With these changes, I averaged 31.4 mpg on the highway, with the top down and cruising at about 75, on a recent road trip. I used to get around 24 or 25. My injectors changed between those points of comparison, as well. Take this information for what it's worth. I normally run the car on e85 so most of my fuel economy data is a bit goofy.
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Old 05-23-2012, 02:28 PM   #93
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Quote:
Originally Posted by lightyear View Post
I cut the hood vents along the frame. Just makes it easier than cutting thru the frame in odd places.

I will still have to cut all the triangle shape pieces and rivet the to the sides of the vents.

Seems like i have taken over this thread, so no more updates from me.
Any plans of adding a Gurney flap to leading edge?
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Old 05-23-2012, 02:52 PM   #94
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It looks as though he bent the material upward--effectively the same thing.
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Old 05-23-2012, 03:56 PM   #95
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Seems like i have taken over this thread, so no more updates from me.
No, keep em coming!

You're doing some interesting stuff.
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Old 05-23-2012, 04:54 PM   #96
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+1

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Originally Posted by handy man View Post
no, keep em coming!

You're doing some interesting stuff.
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Old 05-23-2012, 06:56 PM   #97
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Quote:
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It looks as though he bent the material upward--effectively the same thing.
Ah yes, I see it now.
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Old 05-23-2012, 07:50 PM   #98
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Yes, the first vent has a 20mm raised flap, and the others have a 10mm raised flap. Or about 3/4" and bit under 1/2". So I made it from the leading edge -20mm up, 100mm down, 20mm straight, 10mm up, 100mm down, 20mm straight, etc.
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Old 05-25-2012, 05:52 PM   #99
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I would like to see more vented oem hoods as I am getting ready to cut mine. I looked at the post with the guy talking about carbon fiber with the diagrams of air flow ect but would like some more ideas on how to cut for an NA all motor build.
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Old 05-25-2012, 09:09 PM   #100
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ive got a question about the vented hood, are u going to run ducts to the vents from the rad or from an oil cooler, what are the advantages to running those vents, to relieve pressure under the hood/engine bay to lower temps or is it just to gain an aero advantage seems to me a smooth surface would be better for aero. Just questions not trying to anger anyone just looking for knowledge.
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