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Old 08-31-2005, 09:54 AM   #1
advanracing62
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Default Carbon trunk weight vs. Stock trunk weight?

is there a signifigant weight reduction to be had from stock WRX trunk to CF trunk?
Does anyone know what the weight of the stock trunk and springs is?
CF trunk weight?

of course you'd be deleting the wing, tunk springs, and the lock cylinder- so I know that there is some weight to be saved.
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Old 08-31-2005, 01:17 PM   #2
mcowger
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Compared to the weight of the rest of the car, my guess is it is trivial savings. The stock naked trunk weighs around 35lbs, maybe 40 with springs etc. The CF one might save you 20 lbs, but 20lbs is really nothing.
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Old 08-31-2005, 02:25 PM   #3
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Quote:
Originally Posted by mcowger
Compared to the weight of the rest of the car, my guess is it is trivial savings. The stock naked trunk weighs around 35lbs, maybe 40 with springs etc. The CF one might save you 20 lbs, but 20lbs is really nothing.
20lbs is pretty dramatic in my opinion. all of the those 20lb weight reductions add up(battery, bumper beams, ti exhaust)
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Old 08-31-2005, 02:38 PM   #4
advanracing62
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agreed- 20# here and there all add up to less weight your car has to tote around.. less weight is more power to weight ratio- and better fuel economy.
I have a theory/thought about the bumper beams.. but not for this thread.

Can't remember the equation but it was something like every 100# off the chassis is like .1 off your et. which can also translate into faster lap times as well.
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Old 08-31-2005, 04:04 PM   #5
kunfuzion
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shaving weight is a proven way to recover hp and handling. Some ways are safer than others though.
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Old 08-31-2005, 05:04 PM   #6
Makoto
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Quote:
Originally Posted by mcowger
Compared to the weight of the rest of the car, my guess is it is trivial savings. The stock naked trunk weighs around 35lbs, maybe 40 with springs etc. The CF one might save you 20 lbs, but 20lbs is really nothing.
Does anyone have the specific weight of a wingless trunk? Or know where you could find that out?

-Mike
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Old 08-31-2005, 05:38 PM   #7
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I weighed my 04 trunk (no wing) against a CF trunk
weight was 14 lb lighter
That STI wing sure weighs alot ... I'd say a good 15 lb at least so that's nearly 30 lbs if you go CF wingless

Better yet : the weight decrease is high up there so that helps even more!
and if you don't like the CF rice factor - just paint it to match!

Just make sure you change or remove the stock trunk springs unless you want to be catapulted across your car's roof
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Old 08-31-2005, 05:40 PM   #8
mcowger
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None.
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Old 08-31-2005, 05:48 PM   #9
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When are we going to admit to the fact that we buy carbon fiber parts for looks rather than that pesky weight, since we know carbon fiber weights 10grams
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Old 08-31-2005, 06:12 PM   #10
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Quote:
Originally Posted by rites
When are we going to admit to the fact that we buy carbon fiber parts for looks rather than that pesky weight, since we know carbon fiber weights 10grams
Hood : CF parts are heavier by 1 lb - (compared to aluminum hood)
Trunk : CF is lighter by about 14 lb

14 lb is a considerable amount IMO
If you only use your car for driving around the city and the occasional so-called "spirited-drive" then yes, your lighter CF trunk is only for the looks....

If you autocross or attend trackday events you will notice the "cumulative" weight savings :
mine:
20 lb OEM subframe to aluminum subframe
25 - 30 lb CF trunk, wingless, no trunklid springs
15 - 20 lb OEM seats to Sparco 2000's
~10 lb? OEM battery to Optima Yellow RC31 (the one made for Hondas)
APS TBE don't know the weight savings - but it sure is lighter!
etc etc etc
100 lb total reduction is something to smile about !

Quote:
Originally Posted by Makoto
Does anyone have the specific weight of a wingless trunk? Or know where you could find that out?

-Mike
I'll weigh the stock STI trunk (no wing) when I get home
I have one of those Tanata scales that give yo bodyfat ... should be - + 0.5 lb , I'll ignore the fat % results!
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Old 08-31-2005, 08:11 PM   #11
Makoto
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Thank you
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Old 08-31-2005, 08:15 PM   #12
mcowger
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Weight weenies!
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Old 08-31-2005, 10:12 PM   #13
engineerx
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News Weight Results

Ok - just weighed my '04 STI trunk
No wing
No lock (that's probably only a couple of ounces)

My bathroom scale says

22.7 lbs

That's about right
the CF trunk I got is vey light ~ 11 lbs (only 2 layers thick on the lid! )
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Old 08-31-2005, 10:15 PM   #14
engineerx
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Quote:
Originally Posted by mcowger
Weight weenies!
Yeah ! we live in Socal !
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Old 08-31-2005, 11:59 PM   #15
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my factory wrx trunk w/ springs and spoiler was about 35lbs, and my carbon trunk was just under 10lbs and i lost the springs as well as the lock cylinder.
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Old 09-01-2005, 02:25 PM   #16
selrahc
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Wikdrx and Engineerx, would you mind telling us which brand cf lids you have?
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Old 09-01-2005, 03:20 PM   #17
engineerx
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Mine was by a no-name brand CF shop from So-Cal
http://www.carbonfiberone.com/

Hahahaha!!! I just noticed they got my car on their website !
I got it for free - I let them use my car for fitment .....

The fitment is Ok, the quality is decent
Fiber pattern is not bad, no kinks defects
the edges are "cut" not rolled - (rolled edges are more expensive and add a few grams )
I'd say if you can get it for less than $300 shipped it's worth it!

I think they were selling on eBay for really chep ..less than $300 shipped I think


Last edited by engineerx; 09-01-2005 at 03:34 PM.
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Old 09-01-2005, 03:46 PM   #18
selrahc
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Let me ask, are all these cf lids out there framed in fiberglass? Are their any significant weight saving between one brand or the other (Seibon, VIS, etc.)?

BTW, your car looks great.
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Old 09-01-2005, 04:22 PM   #19
engineerx
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^^^ Thanks.

It's a matter of pricing / manufacturing costs / what customers are willing to pay

100% CF parts are VERY expensive as they require more material, and different manufacturing techniques

back in '95 - '97 I worked on my school's Solar powered car for the SunRayce 97 race (Cal State L.A.)
we made 100% CF parts. The process was excruciatingly meticulous and we had to use "bleeding cloths", vacuum bags, structural adhesives (to glue 2 CF parts together) , etc

Pretty much all not-so pricey CF parts are fiberglassed bottom with one or two layers of CF on top. Not true CF, still some parts are lighter than the sheetmetal they replace (like the trunk lid - but not the Aluminum hood)

For a true 100% CF hood or trunk , expect to pay dearly. I don't know about the JDM parts. Are those fiberglass lined as well?
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Old 09-01-2005, 05:52 PM   #20
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Quote:
Originally Posted by petawabit
20lbs is pretty dramatic in my opinion. all of the those 20lb weight reductions add up(battery, bumper beams, ti exhaust)
um... yah i agree. if that 20 lbs was trivial, why the hell did i get a cf hood? dont tell me "for looks," its on a black car, its not that noticable from afar.
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