Carbon Fiber or FiberGlass ?

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Old Jun 30, 2004 | 04:29 PM
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Default Carbon Fiber or FiberGlass ?

$350 for the cf hood - $250 for the glass hood.

what shall i do ?

no one has ever posted the actual weight of these parts. does anyone have them ??
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Old Jun 30, 2004 | 04:34 PM
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Default Re: Carbon Fiber or FiberGlass ? (ketchup)

Most Fiberglass stuff Is light but alot of it isn't DOT legal.
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Old Jun 30, 2004 | 04:52 PM
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Default Re: Carbon Fiber or FiberGlass ? (ketchup)

most carbon hoods(if not all) are using a cosmetic layer of carbon fiber meaning one top layer of real carbon fiber and the rest of the hood is fiberglass mat and cloth with a black pigment mixed into the resin so that the fiberglass looks black like carbon.
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Old Jun 30, 2004 | 04:56 PM
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Default Re: Carbon Fiber or FiberGlass ? (Ktech)

As far as damage is concerned;

Fiberglass will crack and break if it collides with something.

One of my friends had a lady pull a U-turn right in front of him. He had just installed a carbon-fiber hood and when he T-boned her around 30 mph, the hood bent in the middle. When he backed up away from her car, the hood popped back into place. No damage except for chipped clearcoat and broken hood pins.
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Old Jun 30, 2004 | 05:02 PM
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Default Re: Carbon Fiber or FiberGlass ? (riceburner247)

what i was told by the people at the local shop [super vip] was that cf will crack, i think they meant the clearcoat. i've seen people jumping on cf hoods with no damage, amazing **** but the grade of cf must be alot higher than the average **** on the market.

any weights ?!
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Old Jun 30, 2004 | 06:07 PM
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Default Re: Carbon Fiber or FiberGlass ? (ketchup)

If you plan on painting, Fiberglass... You can't paint CF.
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Old Jun 30, 2004 | 06:22 PM
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Default Re: Carbon Fiber or FiberGlass ? (LSVTEC 91 Civic)

carbon fiber is too pretty to paint
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Old Jun 30, 2004 | 06:48 PM
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Default Re: Carbon Fiber or FiberGlass ? (HondaKPX)

You can too paint CF...and i think it looks better.
As an example if you paint the sides of the hood to match the car then it looks alot crisper and cleaner IMO, but it can be painted, it just has to be roughed up alittle.
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Old Jun 30, 2004 | 06:51 PM
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Default Re: Carbon Fiber or FiberGlass ? (mr_valentino20032000)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mr_valentino20032000 &raquo;</TD></TR><TR><TD CLASS="quote">You can too paint CF...and i think it looks better.
As an example if you paint the sides of the hood to match the car then it looks alot crisper and cleaner IMO, but it can be painted, it just has to be roughed up alittle.</TD></TR></TABLE>

RICE.
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Old Jun 30, 2004 | 06:54 PM
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Default Re: Carbon Fiber or FiberGlass ? (b2o-vtec)

I think a plain black, CF hood slapped on a white car looks like "RICE" but if you paint it to fade into the body color it looks better, and not just a black on white that looks tacky
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Old Jun 30, 2004 | 09:56 PM
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Default Re: Carbon Fiber or FiberGlass ? (mr_valentino20032000)

haha, yea i know it can be painted. i've seen that, where the guy just painted the sides of the hood and left the center CF, it was interesting. I'm most likely going to paint the entire hood, if i go CF - in the meanwhile i can leave it as is and look like everyone else out there on the road.

I'm probably going to get the CF hood. The ones made by VIS, are they double sided cf ? the one i'm going to get is their grade A.
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Old Jun 30, 2004 | 10:00 PM
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I EAT MY RICE. I DONT PUT IT ON MY CAR.
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Old Jul 2, 2004 | 08:53 PM
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Default Re: Carbon Fiber or FiberGlass ? (ketchup)

I have never seen a VIS piece that didnt have fiberglass in it. A very easy way to tell if a hood is fiberglass with a carbon skin is to look in the cavity behind the hoodlatch. You will see a fiberglass mat that has had a black pigment added to the resin to make it look black. For those who dont know what fiberglass mat looks like; its a bunch of random hairs going in every which way stacked on top of each other. There is no weave or organization aka not very strong and its relatively heavy, but it is very very cheap and easy to layup/conform to corners because nothing is interconnecting the fibers together.
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Old Jul 3, 2004 | 08:51 AM
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Default Re: Carbon Fiber or FiberGlass ? (Ktech)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ktech &raquo;</TD></TR><TR><TD CLASS="quote">I have never seen a VIS piece that didnt have fiberglass in it. A very easy way to tell if a hood is fiberglass with a carbon skin is to look in the cavity behind the hoodlatch. You will see a fiberglass mat that has had a black pigment added to the resin to make it look black. For those who dont know what fiberglass mat looks like; its a bunch of random hairs going in every which way stacked on top of each other. There is no weave or organization aka not very strong and its relatively heavy, but it is very very cheap and easy to layup/conform to corners because nothing is interconnecting the fibers together.</TD></TR></TABLE>

Not fully true. Fiberglass doesn't just come in the mat form. It also comes in woven form. This is something you see on the back side of many fiberglass hoods. Its stronger than chopped mat but cannot be used for the skin coat because of the weave "printing" though. So you see it on the back of parts a lot, usually hoods and any larger flat panel. It is good to resist warping and waving. As far as black pigment in the resin is concerned, there is usually no need. Fiberglass and resin become very transparent (about %80 clear) when layed up so if the part is carbon fiber on the surface you will see the black color through the undercoating fiberglass mat. If the part is completely fiberglass the back side will be the same color as the skin coat. That is determined by the color of gel coat that was used.
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Old Jul 3, 2004 | 10:31 AM
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Default Re: Carbon Fiber or FiberGlass ? (idmspeed)

My Invader fiberglass hood was way lighter than my c/f oem style, maybe only 7-8 pounds less but still a difference
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Old Jul 3, 2004 | 10:59 AM
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Default Re: Carbon Fiber or FiberGlass ? (W O T)

7-8 lbs is a significant difference.
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Old Jul 3, 2004 | 12:01 PM
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Default Re: Carbon Fiber or FiberGlass ? (B2FiNiTY)

7-8 lbs is equivilant to one hp regained.
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Old Jul 4, 2004 | 07:16 AM
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Default Re: Carbon Fiber or FiberGlass ? (W O T)

I don't really understand the point in a C/F hood. IMO its mostly just for looks. An expensive one at that. If the Honda hood weighed a ton like a 80's Camaro hood or galvanized steel Porsche 944 hood I could see the the big weight loss from switching to a C/F hood but the simple fact is that a stock Honda hood isn't that heavy to begin with. Have you ever weighed one? The hole black C/F hood on import tuners has gotten a little cliche now. But thats just my opinion anyway.
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Old Jul 13, 2004 | 02:20 PM
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Default Re: Carbon Fiber or FiberGlass ? (idmspeed)

just wondering if the double sided CF hoods are stronger than the plain cf hoods with rolled edges.

i'm not planing on using hood pins with my cf hood setup, even tho it's recommended.

i've also considered getting the cf rear hatch, which weights approx. 10lbs.
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Old Jul 13, 2004 | 02:33 PM
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Default Re: Carbon Fiber or FiberGlass ? (ketchup)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ketchup &raquo;</TD></TR><TR><TD CLASS="quote">i'm not planing on using hood pins with my cf hood setup, even tho it's recommended.</TD></TR></TABLE>

When I had a CF hood on my last car, it rattled a bit because of the way the wind would hit it. I would think that with all the rattling the hood latch will take a beating. If it takes to much abuse, it could crack the CF where the latch mounts up to and the latch could come undone.

I dont care what any manufacturers say but you should use hood pins no matter what with a CF hood. Should the unthinkable happen you are looking at a couple thousands dollar worth of damage. Not only to your precious CF hood, but possibly to your windshield, roof and maybe even other motorists on the road. All that can be prevented by a $20-$40 part and 10 minutes worth of work.
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Old Jul 13, 2004 | 02:39 PM
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Default Re: Carbon Fiber or FiberGlass ? (BlueShadow)

maybe you just needed a new hood latch. I had my cf hood on my car for 2 years before I got hit by a tractor trailer and it never rattled. I didnt use hood pins. My hood closed tight and nice just like factory. BTW when i got t boned my tractor trailer my hood was one of only things that lasted throw the accident. I think if everything is installed correctly you will have no problem without hood pins. If the hood is rattling you have some other problems besides the hood...I guess it can be affected my what kind of hood you had too. I had bknw hood

DEF
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Old Jul 13, 2004 | 02:46 PM
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Default Re: Carbon Fiber or FiberGlass ? (deftones0817)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by deftones0817 &raquo;</TD></TR><TR><TD CLASS="quote">maybe you just needed a new hood latch. I had my cf hood on my car for 2 years before I got hit by a tractor trailer and it never rattled. I didnt use hood pins.

DEF</TD></TR></TABLE>

Yah, the hood latch was acting kinda funky on my last car. I had to install a hood pins with my stock hood, because above a certain speed the hood would pop open. But the hood was also pretty light, even when compared to other CF hoods.

Still, think of the possible damage or even loss of life that could come from a CF hood flying off on a freeway. Sure, the chances are small it could happen to you, but better safe then sorry.
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Old Jul 14, 2004 | 10:26 AM
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Default Re: Carbon Fiber or FiberGlass ? (BlueShadow)

by double sided carbon fiber, did they mean 'rolled edges' ?? as i saw in the pictures, the under webbing of the hood was not completely cf. the only cf that was visible under the hood was around the edges.
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Old Jul 14, 2004 | 10:40 AM
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Default Re: Carbon Fiber or FiberGlass ? (ketchup)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ketchup &raquo;</TD></TR><TR><TD CLASS="quote">7-8 lbs is equivilant to one hp regained.</TD></TR></TABLE>

How do you figure?
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Old Jul 14, 2004 | 11:40 AM
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Default Re: Carbon Fiber or FiberGlass ? (B2FiNiTY)

you take your horse power and divide it by the weight of your car.

formula-
HP / Curb Weight = BHP Per Tonne

stock 91 crx Si-
108 / 988.18kg = 109.29 BHP Per Tonne

same car with 5% weight reduction-
108 / 938.6kg = 115.06 BHP Per Tonne

so thats a 5.82 BHP Per Tonne gained by losing 49.58kg
OR 1BHP per 8kg reducted. ok so it's more like 17lbs per hp.

i just forgot to change the kg over to lbs.
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