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Old 07-21-2002, 03:54 AM   #1
ImprezedRS
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Default Weight reduction!

Well i didn't know where to post this, been a while since i have posted on here and there are all these new forums.

Ok well Tonight me and a couple of friends went down to this small truck weigh station that was closed and weighed my car. Well I have done some weight reduction and well I'm not sure the stock weight was but I have a 2000 RS automatic so whatever that weighs which I think is 3100 lbs. Well I was thinking maybe 2800 lbs or maybe even 2700 lbs but it weighed at 2640 lbs. Well I got more weight to take off so maybe I might be able to hit 2400 lbs, or maybe even 2200 lbs.
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Old 07-21-2002, 04:27 AM   #2
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What weight did you reduce?

Or are you saying that its 2640 with nothing removed?
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Old 07-21-2002, 01:52 PM   #3
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Well half the interior removed(everthing behind driver and passenger seat), Lightweight bumper beams, Lightweight battery, sound deadning material removed in the rear, and some other various parts that have reduced weight.
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Old 07-22-2002, 12:56 AM   #4
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2640, Thats pretty light

Haven't seen you on here in awhile, did you ever get your body kit on?
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Old 07-22-2002, 01:12 AM   #5
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Yes I got it on but havn't had a chance to get it painted yet, I just started working on the body work again and trying to get it done by this car show coming up soon in August. But I'm missing two pieces of the body kit I'm not sure if the seller of it has even shipped it or not.
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Old 07-22-2002, 01:15 AM   #6
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Oh I also did some more figures tonight and I think that I should be able to get the car down to about 2300 lbs by doing some more weight reduction and maybe 2200 lbs if I swap in a manual. I'm also thinking about making carbon fiber door replacements when i race on the track which should be able to bring me down another 100 lbs, so all in all I might be able to get the car down to a total of 2100 lbs
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Old 07-22-2002, 01:15 AM   #7
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2640 is too low to be true.

-Alex
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Old 07-22-2002, 01:42 AM   #8
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It does? Thats weird but maybe I will take a picture next time I go to let everone see. I got some more ideas to loose some more weight that I might do this week if I get a chance and will probally take a trip down to the scale again.

Also as a note that this is a certified truck weigh station that is accurate, and it will round off to the next 20 pounds. So actually I could be between 2621 to 2640
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Old 07-22-2002, 10:02 PM   #9
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I think the stock weight of a MT RS is 2800 lbs., an AT RS would probably be close to 2900 lbs. I'm not sure how you got your weight down to ~2640. Shooting for 2100 lbs is probably unrealistic.
My car weighs 2400 stock. There's no way I could drop 800 lbs from my car. My car is FWD, so I don't have any extra AWD components adding weight.
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Old 07-22-2002, 10:34 PM   #10
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Mine weighed 2804 at a national tour autocross with 1/2 tank of gas and in SM autocross trim with no weight reductions other than the rear seat and spare.
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Old 07-23-2002, 03:27 PM   #11
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I need to go weigh my car.
I ripped out the trunk liner, took out the spare, the jack, metal plate inside the door of the glove box and the sound deadening tar (except for the trunk).
I'm guessing I dropped about 50 lbs from my car, but I'd like to know exactly.
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Old 07-26-2002, 12:09 PM   #12
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Well I heard the auto is an 100 lbs heavier than the manual. But yeah I had a full tank of gas that night and just relized that. I usually only have about a 1/4 tank but I was driving back from Gastonia and deided to fill up about 10 minutes before we got to this place.
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Old 07-26-2002, 12:10 PM   #13
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Also I heard it is 16.5 lbs per gallon of gas, how many gallons do our cars hold?
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Old 07-26-2002, 01:22 PM   #14
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Try about ~6-7lbs per gallon of gas (depending on formulation)... the WRX has a 15.9 gallon tank and the curb weight is 3080. Curb weight is the actual weight of the car with ALL fluids topped off, including gasoline.

So.... with a full tank of gas, we are carrying around about 111lbs of extra weight. Lets say we are on E... 1 gallon left... rounded well say minus 100lbs.... so now the car should weigh 2980. Take out the spare (30-40lbs),... now we are down to 2940...

I have weighed mine with out the spare with a good amount of gas and it was 3040...

I found it very easy to believe that a 2800lbs curb weight car with just simple weigth reductions, could dip under 2700lbs... just in fuel alone (assuming similiar size tanks) it could be done... then spare and bumper removal pretty much insures it.

I had a friend who owned a '96 200SX SE-R... he ran 14.8 @ 93mph in it... the motor was mostly stock... maybe some porting and polishing, cat back, intake, plugs... nothing major...

But his car with weight reductions dipped to 2200lbs!!! He completely gutted his interior save the front seats and dash... no door panels, no back seat, no carpet, notta thing in the trunk... which you could clearly see through the windsheild.... it was a featherweight!! And thus was pretty quick for a car that was probably only making 130hp to the wheels.... I think he actually dynoed it to that tune....maybe 140.... regardless, stock they come with 140 at the crank.... so with the mods I would say it was still under that to the wheels....

BTW- water weighs 8.34 lbs per gallon.... gasoline floats on water... Just FYI....
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Old 07-27-2002, 03:09 PM   #15
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Last time at the track i weighed in my car....i had jack/spare removed, 1/4 tank of gas, and floor mats removed and it weighed 2970 w/o me in it
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Old 07-28-2002, 05:10 AM   #16
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Sorry, but I doubt 2,200lbs is remotely possible on the impreza platform w/o some big $$ being spent.
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Old 07-28-2002, 11:12 PM   #17
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Default Fluid Weights

Dug-E-Fresh's post got me thinking so I looked around on the net. Here are some numbers to toss around:

Gasoline and Oil Weight
1 gallon of gasoline = 6.1 lbs.
1 gallon of fuel oil = 7.7 lbs


Water Weight
The weight of a gallon of water is about 8.5 pounds.
(For the windshield washer fluid)

Yep! Just like Dug-E-Fresh said. Interesting!

Last edited by Kevin Thomas; 07-28-2002 at 11:24 PM.
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Old 07-28-2002, 11:29 PM   #18
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Default Muhaha!

Quote:
Originally posted by XT6Wagon
Sorry, but I doubt 2,200lbs is remotely possible on the impreza platform w/o some big $$ being spent.
How about a 1993-1995 FWD Impreza L? It weighs in 2400lbs or so. With less than a 1/4 of a tank of gas and based on the talk above, you'd be approaching 2325 or so.

XT6Wagon, I know what you meant but you know how people are here.
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Old 07-29-2002, 05:06 AM   #19
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Quote:
Originally posted by XT6Wagon
Sorry, but I doubt 2,200lbs is remotely possible on the impreza platform w/o some big $$ being spent.
I could do it pretty innexpensively to my car...

I think my Impreza is like 2650 stock or so?

Remove sound deadening material
Lightweight bumper beams
Gut interior
Lightweight seats
remove abs and driver/passanger airbags
get rid of all the useless bolts/stuff around the car
I'd probably swap in a EJ25 though since supossedly they are the same weight
Lightweight flywheel, ligthweight driveshaft (only 10lbs for the driveshaft though, but it would help none the less )
pulleys, simple custom intake, MRT full exhaust (which seems to weigh less than stock)
Get ride of the driver/passanger windows
10lbs 16" wheels with smaller diameter tires...

I could get close
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Old 07-29-2002, 05:13 AM   #20
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I should take that back, it might just be possible. I still doubt it though. The Loyale has a hard time getting that light and its a much smaller car. Of course it has more "wasted" wieght where cheaper parts were used instead of lighter parts.

Also it would be easy if you swap in a carbed EA-81, with a FWD Turbo 5spd from a 85. That will save 400lbs or so over a EJ with AWD. Of course <100hp is a problem....
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Old 07-29-2002, 08:05 AM   #21
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Quote:
Sorry, but I doubt 2,200lbs is remotely possible on the impreza platform w/o some big $$ being spent
I wasn't saying it was possible with an Impreza.. just that with substantial weight savings, a "slow" car can be made pretty darn quick....

200SX SE-R's STOCK run 16s in the quarter.... for one to break into the 14s is pretty substantial.... but it was mostly acheived through weight reductions.... that was my point.

def
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Old 07-29-2002, 05:37 PM   #22
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I'm still going to try to get my car down to 2200 lbs, I have many things planned to get it to that weight. Hopefully I will be able to do it. We will see though. I just want a 500hp, 2200 lb, AWD beast!
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Old 07-30-2002, 02:21 AM   #23
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Quote:
Originally posted by ImprezedRS
I'm still going to try to get my car down to 2200 lbs, I have many things planned to get it to that weight. Hopefully I will be able to do it. We will see though. I just want a 500hp, 2200 lb, AWD beast!
I dont think it will be possible with an RS... Too many differences in design between it and the older GC's... Cable clutch vs. hydrolic, two crossmembers instead of one, etc.
You would probably have to do drastic things like replace body pannels with CF pannels and the glass windows with lexan or whatever the lightweight stuff is that racecars use
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Old 07-30-2002, 12:45 PM   #24
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Quote:
Originally posted by Kostamojen

You would probably have to do drastic things like replace body pannels with CF pannels and the glass windows with lexan or whatever the lightweight stuff is that racecars use
Exactly what I will be doing.
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Old 07-30-2002, 03:14 PM   #25
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On an AWD car, I'd think that reducing weight might be a little harder because you have extra drivetrain components that add to the weight. Taking off 600 lbs. from a dedicated race car might not be too hard, but from a daily driven street car, I don't see it happening.
The weight of a stock FWD Impreza is 2400 lbs. I figure with all the stuff I've taken out, I'm down to 2350 lbs. Carbon fiber hood, aluminum trunk lid, lightweight seats, lightweight pullies, ligthweight bumper beams, throw on some superlight 16"s and I bet I'd be around 2200 lbs. It'd be much cheaper and easier to just add HP than reduce weight though.
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