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Make your own carerra GT hood scoop.
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joecitizennn  



Joined: 12 Sep 2005
Posts: 2096
Location: no mans land

PostPosted: Mon Apr 26, 2010 11:40 am    Post subject: Make your own carerra GT hood scoop. Reply with quote

A carerra gt hood scoop seems to go for around 200 bucks these days. If you are like me that seems a little high for a hunk of fiberglass. Luckily wal-mart sells the materials to make your own for less than 50 dollars.

What I bought,

Two cans of polyurethane expanding foam.
One can of fiberglass resin.
One pouch of fiberglass matting.
One can of short strand fiberglass.
Can of primer.

I had no hood scoop to go off of so i had to use pictures. I simply drew one on my hood.

Then applied a layer of tape so the finished product could be removed from the hood.

Then I applied a couple layers of foam.


carved it into the shape I wanted.

Sanded it a bit. (yes you can sand expanding foam, it is awesome stuff)

Looks a little better than the pile I started with.

Important! You must cover the foam with tape, or the fiberglass resin will soak into the foam, firstly wasting resin, secondly eating the foam, third, you want to remove the foam from the scoop when you are done, and tape makes an easy removal.

Then follow the directions on your can of fiberglass resin and lay 2 to 3 layers.

When the fiberglass hardens block sand it as much as you can without sanding through the high spots into the foam.

Then fill the low areas and imperfections with short strand fiberglass. My favorite way to mix epoxy fillers is on paper plates with plastic spoons. It makes clean-up easy.

Now fill and sand, fill and sand till you get a nice smooth surface. This takes a while sometimes.


When you have it where you want it, squirt it with some high fill primer to see what you have got.

If you like what you see, now is the time to pop it off the hood. I used a kitchen utensil for the job.

Since I used the tape, the scoop was easy to separate from the foam model as well as the hood. Make sure to apply fiberglass to any thin areas on the underside. To find any thin spots hold the scoop up to a bright light and look for any light glowing through.

This is what I ended up with.



Sneak peak at my latest project car.
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JayZzzz4  



Joined: 23 Sep 2008
Posts: 544
Location: Milwaukee, WI USA

PostPosted: Mon Apr 26, 2010 11:46 am    Post subject: Reply with quote

Noooooo WAy!!!!!!!! That's AWEsome!!! Looks beautiful. How many hrs did it take? You might want to make a mold of that and start selling them. I've been trying to work with fiberglass lately, it's a little tricky. I'm trying to think of a way to do side skirts and I've been thinking about using spray foam and fiberglassing over it. Now seeing your work I think that might be the way to do it.
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Scorpio  



Joined: 05 Jul 2007
Posts: 1957
Location: Brisbane, Australia

PostPosted: Mon Apr 26, 2010 12:34 pm    Post subject: Reply with quote

Excellent how to...i used the same method to incorporate a double din holder into the dash...
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Joes924Racer  



Joined: 03 Nov 2002
Posts: 11964
Location: Oregon, Denver Colorado native!

PostPosted: Mon Apr 26, 2010 3:16 pm    Post subject: Reply with quote

yea Excellent. I like it.
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924aussie  



Joined: 02 Feb 2006
Posts: 1009
Location: Chinchilla Queensland Australia

PostPosted: Mon Apr 26, 2010 8:03 pm    Post subject: Reply with quote

I am too lazy and would just buy the finished product, that said good job


Alan
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joecitizennn  



Joined: 12 Sep 2005
Posts: 2096
Location: no mans land

PostPosted: Mon Apr 26, 2010 10:03 pm    Post subject: Reply with quote

JayZzzz4 wrote:
. How many hrs did it take? .


making fiberglass parts this way, without a mold takes alot of sanding and shaping. The longest part of the project was the sanding. That said, I laid the foam before bed one night, laid the fiberglass the next evening after work, and finished the sanding and shaping the next day.
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JayZzzz4  



Joined: 23 Sep 2008
Posts: 544
Location: Milwaukee, WI USA

PostPosted: Tue Apr 27, 2010 2:47 am    Post subject: Reply with quote

So removing the foam from the fiberglass was easy with tape? Did the foam break apart in the process? The reason why I ask this is if I make a universe side skirt (same shape for both sides) can I remove the foam from the fiberglass and then fiberglass it again? This way would be easier then foaming both sides and trying to get the geometry so be the same. Thanks
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joecitizennn  



Joined: 12 Sep 2005
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PostPosted: Tue Apr 27, 2010 3:04 am    Post subject: Reply with quote

In all likelyhood the foam base will not be reuseable. It did remove easily because I used tape preventing the resin from entering the foam, but the resin is so aggressive that it attacks the foam and actually shrinks it a little, even through the layer of tape. THis does not affect the shape of the resin form because the resin hardens long before the foam begins to shrink.
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11698
Location: PacNW

PostPosted: Tue Apr 27, 2010 3:34 am    Post subject: Reply with quote

Impressive.
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PORSCHEV  



Joined: 02 Nov 2002
Posts: 1901
Location: Cedar Lake Nova Scotia, Canada

PostPosted: Tue Apr 27, 2010 7:53 am    Post subject: Reply with quote

Great job!!

Why did you use the hood as your working surface? To get the contour?
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ideola  



Joined: 01 Oct 2004
Posts: 15544
Location: Woodstock IL

PostPosted: Tue Apr 27, 2010 11:33 am    Post subject: Reply with quote

Joe, nice job, and nice writeup as always. You always make it look so easy!

Question: that is an interesting looking bumper arrangement there on the sneak peak of your project...what's going on there???
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Joes924Racer  



Joined: 03 Nov 2002
Posts: 11964
Location: Oregon, Denver Colorado native!

PostPosted: Tue Apr 27, 2010 3:01 pm    Post subject: Reply with quote

You can also dissolve the foam.. learned that trick from a hobby dude.
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joecitizennn  



Joined: 12 Sep 2005
Posts: 2096
Location: no mans land

PostPosted: Wed Apr 28, 2010 10:29 pm    Post subject: Reply with quote

Quote:
Why did you use the hood as your working surface? To get the contour?


Yes. In this case it really helped to have a hood in primer as a working surface. Without any other parts to go off of, getting the proper contour would have been alot of work. Plus, sanding and working the fiberglass is about 10 times easier with the car holding your part for you.
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joecitizennn  



Joined: 12 Sep 2005
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Location: no mans land

PostPosted: Wed Apr 28, 2010 10:30 pm    Post subject: Reply with quote

ideola wrote:


Question: that is an interesting looking bumper arrangement there on the sneak peak of your project...what's going on there???


something I have wanted to do for a looooong time.
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ideola  



Joined: 01 Oct 2004
Posts: 15544
Location: Woodstock IL

PostPosted: Wed Apr 28, 2010 10:39 pm    Post subject: Reply with quote

joecitizennn wrote:
ideola wrote:


Question: that is an interesting looking bumper arrangement there on the sneak peak of your project...what's going on there???


something I have wanted to do for a looooong time.


please elaborate
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