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Fiberglass or Carbon Fiber

Ok as many of you know I am redoing my 87 924S aka Project red blaze. It will be undergoing many changes, body and engine. For the most part I have a good idea on what I want to do but I seem to be stuck on one thing. What should I use for replacment body parts?? Carbon fiber or Fiberglass?? I know carbon fiber is $200-$300 more than fiberglass but it is alot lighter. Has anyone used carbon fiber before??? WHat would the fit be like??? Can you paint it??? I need Pro's and con's of the two.



Ohh yea, I dont want to hear That its a waste of money to do on a NA or any BS like that, all I want is some usefull Info. Thanx guys

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1986 951, Stock for now.
]87 924S Gaurds red- SOLD after 11 years of ownership
Old 10-21-2004, 06:11 PM
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Maybe this will help.. How to: Make Fiberglass and Carbon Fiber Parts

seems to go into alot of detail about both materials. Not 944 specific tho.
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Old 10-21-2004, 07:14 PM
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I'm not sure how the two compare with each other for painting, etc...but I would think if you want to save weight, go all the way while your at it.
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Old 10-21-2004, 08:45 PM
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No way man- nobody should go after you for cutting weight. I think it would be amazing to strip serious weight off of these cars. I'd like to see the results.
Old 10-21-2004, 10:35 PM
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Carbon-fibre all the way! Strength-to-weight is about 5-10x better than fibreglass. That's for fully-optimized configurations, so your mileage may vary. Not sure what you're making, but you want to use:

- high-modulus unidirectional carbon-fibre (EMS) for best strength. Align fibres in direction of load. Preg-peg is best.
- epoxy resin (avoid low-strength polyester)
- make mold and plug for pressurized mold, yields lighter and stronger part with higher fibre-to-resin ratio than hand-layup.
Old 10-22-2004, 12:06 AM
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Well I think I will be replacing fenders, hood, front valance and some other odds and ends with Carbon finder, It should drop the weight alot BUt I gotta start running the numbers to see if I have enough money. I wll also be removing the rear seats and AC system
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1986 951, Stock for now.
]87 924S Gaurds red- SOLD after 11 years of ownership
Old 10-22-2004, 02:13 PM
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Are you planning on making the panels yourself?

Any idea what this would cost in materials?

I would love a complete carbon fiber shell!!!

If you want to make something how about we start with a more aggressive rear spoiler. I wanna see how it comes out.
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Old 10-22-2004, 02:28 PM
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Cutting weight is good but...
  • Fiberglass is cheaper to replace than carbon fiber (you knew that).
  • Because carbon fiber parts are more expensive to replace, they are more expensive to insure. You don't have to tell your insurance company, but they won't replace them either if they get damaged.

I'm going to go with fiber glass eventually. That's my 2 cents.
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Old 10-22-2004, 05:16 PM
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I was planning on doing some fiberglass parts myself, starting with making some different bumpers probably. Then moving on to other things, let me know what you decide on!
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Old 10-22-2004, 06:05 PM
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With carbon fiber if you don't paint it looks cool. So you can save on the expensive and heavy paint job. Go all the way while your at it. Go carbon and post plenty of picks and info.

Speedy
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Old 10-22-2004, 06:46 PM
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Well the problem with not painting it is some of the car will be red and the rest carbon fiber I dont think it will look right
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1986 951, Stock for now.
]87 924S Gaurds red- SOLD after 11 years of ownership
Old 10-22-2004, 08:17 PM
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Have you seen the latest Grassroots Motorsports magazine? It's got a 5 page spread about DIY carbonfiber - I don't have a scanner, else i'd get you a copy of it. It's also got another good article about removing stubborn nuts and bolts.
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Old 10-22-2004, 11:23 PM
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How do I get Grassroots Motorsports??
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1986 951, Stock for now.
]87 924S Gaurds red- SOLD after 11 years of ownership
Old 10-23-2004, 08:49 AM
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www.grmotorsports.com

I have always liked there mag, going fast on a budget.
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Old 10-23-2004, 09:26 AM
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What about weight distribution? Are you going to do anything to try to keep it close to 50/50?
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Old 10-23-2004, 10:45 AM
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I will try the best I can, Like I said the rear fenders will be changed and the rear seat will be comming out. I dont think It will be loosing so much weight that it will mess things up
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1986 951, Stock for now.
]87 924S Gaurds red- SOLD after 11 years of ownership
Old 10-23-2004, 01:15 PM
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last i knew, Painting carbon fiber is a bit*h and a half and REALLY expensive to do. If you have the $$$ i would say go for it but i wouldn't stap stuff on until its painted. You could alwayse do it one piece at a time, and then paint. will keep your car getting progressivly lighter, and looking good at the same time

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Old 10-23-2004, 09:11 PM
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