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Old 09-03-2001, 11:18 PM   #1
sportysubby
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Default weight reduction

Besides stripping the car, ive been thinking of some other weight reduction tactics that might work. Has anyone here thought of using Lexan windows? How much weight do u think you'd drop with lexan for the rear window and to rear passenger windows? I think thatd help weight alot and look pretty cool too...

any ideas or comments?
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Old 09-03-2001, 11:34 PM   #2
alfriedesq
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I did the following weight mods . . .

Removal of weight in glove box door; daytime running light modual; hood prop bar; all trunk stuff; air intake stuff;

I am going to yank teh a/c compreser very soon

Thought of lexan windows - - but am thinking that the stock ones dont weight that much - seems like cheap glass

Thinking to switch to lighter seats up front the stock ones are rather heavy

When I ran it this weekend with all seats and radio out - it was like a different car - amazing improvement
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Old 09-04-2001, 12:02 AM   #3
jmimac351
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Quote:
Originally posted by alfriedesq
I did the following weight mods . . .

Removal of weight in glove box door; daytime running light modual; hood prop bar; all trunk stuff; air intake stuff;

I am going to yank teh a/c compreser very soon

Thought of lexan windows - - but am thinking that the stock ones dont weight that much - seems like cheap glass

Thinking to switch to lighter seats up front the stock ones are rather heavy

When I ran it this weekend with all seats and radio out - it was like a different car - amazing improvement
Such a nice car. I could cry. I really could just cry...

Jim
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Old 09-04-2001, 12:08 AM   #4
Wagonwheels
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Default Weight reduction

Try a salad with low fat dressing.
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Old 09-04-2001, 12:34 AM   #5
jmimac351
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Quote:
Originally posted by alfriedesq
Removal of weight ...hood prop bar...
Upon further review, that is one of the funnier things I have ever read with respect to making a car go faster. You have GOT to be kidding. I think perhaps this gives us some insight as to your recent behavior. Have you been getting whacked in the head by your hood a lot lately?

Al, you really make me chuckle. Are you aware of "generally" how much weight you need to remove from a vehicle to pick up a tenth in the 1/4? Now how much weight will remain in your car because you have to carry a slew of towels because you are sweating your cajones off because you have no a/c?

This is sooo funny. I am going to forward this to my other buddies that have serious drag cars. What a hoot! Thanks for making my day, AL.



Jim

PS. Speaking from 9 years experience with a similar weight car, the answer to the above question is "generally" about 100lbs. (give or take a hood prop) to pick up a solid tenth and 1mph in the 1/4 mile.
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Old 09-04-2001, 12:40 AM   #6
alfriedesq
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I'm trying to be serious here and you guys keep with all these flaming insults .. . . . I'm getting sick of this

Just to defend myself . . . .

My car is over 120 lbs lighter than when I bought it

When I took the seats and radio out this weekdn - that made it 185 lighter

I guess the guys who designed the Lightweight M3 and the classic 3.0csl - not to mention the club sport porsches and the new lightweight M3 comming out also without a/c were idiots like myself

We're all punch drunk
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Old 09-04-2001, 12:45 AM   #7
BrownKiler
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What is up with this board, why do people hate on other peoples choices of mods and what they do with their car? If someone wants to reduce weight or drag race, more power to them. I've looked at other boards and seen people lose 100 lbs on other types of cars and keep full interior, you just gotta be creative.

Besides the obvious glove box weight, silencer, trunk stuff, here's some more things you could try:
Remove hood insulation (may have negative effects, heatwise, not sure).
Lighter weight racing battery.
Empty wiper fluid.
Remove center seat belt assembly.
Lightweight 16" wheels + tires.
Lightweight brake kit (the Stoptech kit is lighter than stock).
Custom exhaust--most exhausts are lighter than stock.
Replace front seats with lightweight racing seats (gets rid of heavy side airbags).

Hardcore:
Remove AC.
Remove cruise control.
Manual roll-up windows from an Sti RA (if available).
Remove passenger air bag.
Remove radio (I can't survive without a radio myself!).

Ghetto (full race car):
Remove back seat, seat belts.
Lexan.
Remove Front bumper beam.
Remove all sound deadening material.
Strip interior.
Lightweight steering wheel (no airbag).
Lightweight fuel cell instead of gas tank.
Roll cage (adds weight back on, doh!).

A link to a DSM weight reduction discussion:
http://www.dsmtalk.com/forums/showth...?threadid=8226

Yes, 100 lbs is only worth around 0.1 on the 1/4 from what I've read. However, handling and braking should also improve. One guy on the DSM forum went from 3050 to 2800 lbs with a rollcage, but that was a full race car at that point.

--Jason
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Old 09-04-2001, 12:51 AM   #8
jmimac351
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Quote:
Originally posted by alfriedesq
I'm trying to be serious here and you guys keep with all these flaming insults .. . . . I'm getting sick of this

Just to defend myself . . . .

My car is over 120 lbs lighter than when I bought it

When I took the seats and radio out this weekdn - that made it 185 lighter

I guess the guys who designed the Lightweight M3 and the classic 3.0csl - not to mention the club sport porsches and the new lightweight M3 comming out also without a/c were idiots like myself

We're all punch drunk
No, no, no, Al. I agree, removing the a/c compressor will help. That is a bit of weight. While your at it you should remove the condensor and the accumulator and the lines as well. You might also consider running a short belt that bypasses the alternator for the drag runs. Not sure if that causes the computer to trip up or not. I just can't get over the hood prop thing. It really made me chuckle. Hood prop? C'mon!

Jim
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Old 09-04-2001, 01:14 AM   #9
cdigerlando
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To each his own. I really don't think you will gain much by doing all of this, but it is your car. Don't forget, this is a street car, not a race car. If you are building it for race only, then go for it. As for me I use my car for the street and would like to lug a few items of convienience and maybe a chick or two. If it is performance you want, I think you should do some power mods, and think about some of the lightweight part conversion kits that may come available such as CF parts, brake kits, etc. as mentioned in a previous post.

I think I would go on a crash diet before removing my AC. Then again I live in Florida. I'll give you a call when I need replacement parts.
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Old 09-04-2001, 01:58 AM   #10
GarySheehan
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We replaced the rear window and rear passenger windows with Lexan. The stock rear window was 17 lbs. The Lexan replacement was 7 lbs. I can't remember what the side window savings were, I'll weigh that stuff tomorrow and get back to you. May be another 7-10 lb weight savings.

Gary
Sheehan Motor Racing
#72 Subaru WRX USTCC
www.teamSMR.com
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Old 09-04-2001, 02:11 AM   #11
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A lot of the mods I have on the car are lighter than stock. The brakes, the coilovers, the seats, the uppipe, the downpipe, the exhaust, the rims are all lighter than stock.

During the SCC test, I also had the criuse control, DRL's, metal chunk in the arm res and rear middle seat belt removed.

Ever since I put my Zero Sports kit on, I installed lightweight bumper beams. The stock suckers are super heavy. At the same time, I added my stereo system (3 amps, deck, EQ, D/A converter and a 15' of 0 gauge cable to the trunk for my battery)

I think that my car is lighter than stock, but I am yet not sure how much. I am going to install my CUSCO exhaust manifold, titanium exhaust and few suspension peices and they I will weight my car.

I want it to weight 2800. A lot of people think I am crazy, but I think I can do it without the need to do crazy stuff.

We'll see.
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Old 09-04-2001, 02:27 AM   #12
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The weight thing is a big factor. I forgot about the exhaust stuff - that saved some big lbs.

Imprezer. Did you fabricate your own beams? Thats is next on my list. Those suckers are too damm heavy and being so far out they really effect the corners - make it wanna spin.
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Old 09-04-2001, 03:01 AM   #13
Wagonwheels
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Default Go for it

A few weeks on protein shakes and leafy greens and you could keep you're A/C!

Was not trying to ridicule your weight reduction program but the fact is driver weight is just as important. Plus you could probably stand to loose a few pounds.

So, next time you head out to tear another part off your car bring along a small Zip-lock baggie full of baby carrots for a snack.
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Old 09-04-2001, 03:07 AM   #14
sportysubby
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ok, well back to the ORIGINAL question, lexan windows... yay or nay? I didnt think a window question could possibly turn into an argument, but i guess anything is possible. Im gonna have to take al's side on this one, there is no need to rip the guy for trying to reduce weight, even if it is light things liek the hood prop ( i dont understand that one, but hey whatever helps...) Hey al, how the hell do u work in the engine bay without that thing anyway? haha

but again, has anyone done lexan rear windows and rea side windows, or do u think they would help at all?
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Old 09-04-2001, 03:54 AM   #15
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All I know about lexan, is that ZERO Sports makes a light weight glass kit. Made out of lexan. They are identical to the real glass and you can still use power window feature. They cost an arm and a leg though.
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Old 09-05-2001, 02:25 AM   #16
GLOATLIP
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Default Lexan for wagon!?

Yeah- lexan windows. Ive been thinking about them for my '02 wrx wagon. I'm trying to lighten it as much as possible (within reason.)
How do you get in touch with zero sports? Any other vendors out there sell 'em?

cheers,
gloatlip
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Old 09-05-2001, 03:17 AM   #17
Andrew
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if you really want to lose some weight with some SIMPLE bolt"offs" at the drag stip do the following:

remove headlights and foglights
remove grill
remove spare and jack
remove hood
remove front bumper
remove sideskirts
remove trunk lid and spoiler
remove rear bumper
remove doors
remove all seats except driver

that shoudl be good for a couple hundred pounds assuming the doors weigh alot
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Old 09-05-2001, 06:34 AM   #18
XT6Wagon
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I'd leave the hood on. On my SHO with a HUGE steel hood it maybe took off 10-15lbs. The car did make a bit more power due to the cooling of the intake manifold, BUT it was no faster due to the huge ammount of drag that occurs at 60+ mph.
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Old 09-05-2001, 09:19 AM   #19
Tuning Factory Inc.
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WRX hood is pretty light due to alluminum structure unlike the super heavy 2.5 RS hood. I am also trying to remove weight as much as possible. The manifold, downpipe and exhaust all help a great deal as will a lighter suspension, lighter wheels and removing bumper structures. The stock seats are not as heavy as you think they are. I was surprised that my Sti seats were not much lighter than the stock ones despite not having any side airbags. So Imprezer, where did you get the lightweight bumper reinforcements?
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Old 09-07-2001, 10:45 PM   #20
GLOATLIP
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Question yeah, where do you get lightweight bumper reinforcements and lexan windows??

for '02 wrx?
I'm usually pretty good at researching/finding stuff I WTB, but these items stump me.



anybody?

thanks in advance,
Eric
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Old 09-08-2001, 12:08 AM   #21
XT6Wagon
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God, have you looked into getting a intake manifold made out of CF for the WRX? The EJs in aricraft use commonly have a CF intake manifold made to reduce wieght and make a bit more power.
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Old 09-08-2001, 03:48 AM   #22
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that engine has gotta weigh a lot...imagine your 1/4 mile times with it removed


-Alex
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Old 09-08-2001, 11:55 PM   #23
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see, now we're getting somewhere
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Old 10-05-2001, 05:36 AM   #24
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remove skidplate, wing, boost control solenoid bracket, clock
, taillights
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Old 10-05-2001, 09:34 AM   #25
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Nissan Sentra SER in my area runs 14.8 with an intake and exhaust.....but he has no interior at all except the driver seat.....he has weighed it in at 2300lbs....pretty damn light.....another guy who works outside of Eastside Motorsports drives what he refers to as "the fastest all motor jetta in the world" and it has 182,000 miles on it...anyway, he runs 12.7s and 12.8s all day.....again, his interior is gone, only the driver seat stays, he also weighs in at 2300lbs......the sentra only has like 130 wheel hp and the jetta only makes 180 some wheel hp.......weight made the difference....but the sacrifices involved......man I dont know

....actually I do....I will make some weight savings....spare tire, jack, plan to remove the glove box weight, install a light weight battery and if I go Audio upgrades, no more than one 10 or 12" sub.....and when I get rims the #1 pre-requisite is lighter than stock, same with the exhaust...must be lighter...eventually I want to get the aluminum control arms, unsprung weight and rotating weight are the most important weight reductions one can do.....thats what I would like to concentrate on....rotating weight doubles the strain on the engine compared to weight just sitting in the car.....I mean 5 lbs per tire (extra) would be felt in terms of acceleration as 40lbs of extra weight....unsprung weight hampers suspension response much more than an equal amount in the trunk......but A/C removal....I dont even use it that much, but I dont think so......
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