Welcome to the North American Subaru Impreza Owners Club Thursday April 17, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC General > Motorsports

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 06-23-2009, 10:07 PM   #1
MidLifeRally
Scooby Newbie
 
Member#: 131322
Join Date: Nov 2006
Default Weight

I am almost finished with my yearlong RS 05 STi swap. My RSTi weighs
2935 with a/c and 10 inch 275 width rims and tires. Everything else is guttted
with a 4 point cage and Racetech seats, and intercooler spray tank and fluids.
This is heavier than I expected it to be. How does this compare? Dunk?
Boost Junkie? (I am building this car for time attack/ chasing my friends in
Vettes at track days.) Also, what would ideal corner weights be? (Weights or
percentages are O.K. Thanks to all who respond!!!!
* Registered users of the site do not see these ads.
MidLifeRally is offline   Reply With Quote
Old 06-23-2009, 11:01 PM   #2
speedyHAM
Scooby Specialist
 
Member#: 48377
Join Date: Nov 2003
Chapter/Region: MWSOC
Location: "They eat fish soaked in lye"
Vehicle:
1996 Gutted, built
XP class Impreza L

Default

2935 with you in it?

It's still pretty heavy. If it is really just for time attack and track days I'd recommend removing all the sound deadening from inside and outside the car. That stuff weighs a lot more than most people think.

Do you have a full interior?

Idea corner weights would be 50-50 side to side and 45 front 55 rear, but you will never get a subaru there. Shoot for 56 front 44 rear and make sure the cross weights are 50-50. Side to side you can't do much of anything unless you move stuff around.
speedyHAM is offline   Reply With Quote
Old 06-24-2009, 01:03 AM   #3
misterwaterfallin
Scooby Specialist
 
Member#: 101091
Join Date: Nov 2005
Chapter/Region: NWIC
Location: Seattle, WA
Default

why ac? why intercooler sprayer?
Strip that out, the deadening like speedy said, and whatever else you can find. If you want to lose more start cutting. The inner doors can take a shave, replace glass with lexan, ect.
also catless exhaust and new exhaust manifolds can save some weight to
misterwaterfallin is offline   Reply With Quote
Old 06-24-2009, 06:57 AM   #4
Storm
Scooby Guru
 
Member#: 5218
Join Date: Mar 2001
Chapter/Region: MWSOC
Location: SAUL'S Motorsports
Vehicle:
96L Most Over-
Developed Beater

Default

Probably should've started with a Brighton instead of the portly RS.

Jay Storm
sittin at 2450 with a full interior (for the most part).
Storm is offline   Reply With Quote
Old 06-24-2009, 09:13 AM   #5
MidLifeRally
Scooby Newbie
 
Member#: 131322
Join Date: Nov 2006
Default

Weight was without me. A/C because I'm old, and sound deadening
is already out. Center console is in, dash and glove box. Maybe I
should have started with a Brighton, but this was my old Rally-X,
beginning track car until it blew. Seems heavy to me. Storm, I knew
you were light, but I have a full STi driveline. I just was curious what
others are????
MidLifeRally is offline   Reply With Quote
Old 06-24-2009, 09:19 AM   #6
boost junkie
Top Scoob 009
 
Member#: 68273
Join Date: Aug 2004
Chapter/Region: MAIC
Location: Silver Spring, MD
Vehicle:
2012 WRX
GD Race Car in progress

Default

Hard to compare for me and dunk since the GC is quite a bit lighter than the GD to begin with. You can get a lot more weight out of there, just depends on whether you're willing to go all the way with it. Also, if you plan to compete with the car you should decide what series/class you will be in and make sure you build it to those rules.
boost junkie is offline   Reply With Quote
Old 06-24-2009, 10:07 AM   #7
subydude
Scooby Specialist
 
Member#: 80649
Join Date: Jan 2005
Chapter/Region: South East
Location: Columbia, SC
Vehicle:
2000 2.5 Auto-X RSTi
What's A Head Gasket?

Default

Quote:
Originally Posted by Storm View Post
Probably should've started with a Brighton instead of the portly RS.

Jay Storm
sittin at 2450 with a full interior (for the most part).
Now that I've built my car up I agree with this. I started with the RS since it "looks" better, and everything is there for easy daily driving. If I had it to do over again I would have started with a 95 L or something.

Now with a full interior minus the back seats per SM rules and a lot lightening allready done (still have STi seats) I'm sitting at 2910. Without me in it. Granted this is with the 6-speed transmission and the heavy Brembo's/R180. I think if you were extremely into light weight mods you'd go to a dog box 5-speed, R160 with clutch type guts, lighter brakes, and a few other things. With those changes I could see getting down to the 2600 lbs range.

For me I'm taking the sunroof out, carbon fiber driveshaft, sound deadening out of the trunk, and anything else I can find that's legal in SM. Trying to get it to 2820 (minimum weight for me).
subydude is offline   Reply With Quote
Old 06-24-2009, 10:24 AM   #8
Homemade WRX
Scooby Guru
 
Member#: 33782
Join Date: Mar 2003
Chapter/Region: MAIC
Location: 3MI Racing LLC
Vehicle:
96 bastard child
search FIRST, then PM!!!

Default

This thread makes me wonder why the RS' are so much heavier than the brightons and L's or earlier years...wonder if they used a heavier sheetmetal in later models?
Homemade WRX is offline   Reply With Quote
Old 06-24-2009, 10:44 AM   #9
MidLifeRally
Scooby Newbie
 
Member#: 131322
Join Date: Nov 2006
Default

I always thought that RS's were alot lighter than STi's and peeps
kept saying that with the same motor/drivetrain my car would be
noticeably faster than an STi. Thats why I was so disappointed
with my 2935 wet weight. Off to search factory stock weights...
MidLifeRally is offline   Reply With Quote
Old 06-24-2009, 12:58 PM   #10
grippgoat
Scooby Specialist
 
Member#: 62182
Join Date: May 2004
Chapter/Region: NWIC
Location: Kirkland, WA
Vehicle:
2005 STI
White

Default

Carpoint.com is decent for stock weights. And 2935 is a hell of a lot lighter than even an 04 STI. 04 was 3250ish, 05 3298, and they kept getting heavier after that.

That said, go look up AnorexicSTI's thread on IWSTI.com. It's kind of epic.

EDIT: Had it bookmarked: http://www.iwsti.com/forums/gd-membe...bs-2598-a.html

-Mike
grippgoat is offline   Reply With Quote
Old 06-24-2009, 02:04 PM   #11
RB5 Clone
Scooby Specialist
 
Member#: 30909
Join Date: Dec 2002
Chapter/Region: NESIC
Location: lastditchracing.net & 03 STI
Vehicle:
RA East Open Class
Champs 07-08-09

Default

an RS shell is indeed, quite a bit heavier than an early L...electric windows, AC, sunroof, lots of body goop/insulation, those big ole long coupe doors, it all adds up quick. body shell itself is not the difference, it's all the extras.

I recently re-installed interior into a stripped 00 RS coupe, you would not believe how much all that stuff weighs--the glovebox molding and frame alone weighs 10 lbs, center console/center stack ditto, kick panels 3-5 each, carpeting 20, stock seats 40-50 each, etc etc.

I had a 94 L sedan built into 2.5NA spec Open Class rally car, it weighed just over 2600 fueled & ready to rock and only passed the 2700# minimum with a spare tire, jack, and tool kit aboard. only stock interior remaining was main dash molding, everything else was gone. This weight included 2 race seats w/6-pt belts, full cage, 15 gal fuel cell, extensive 3/8" ally skidplates, ham radio, intercom, rally computer yadda yadda.

In other words, your RS can still lose lots o weight.

Last edited by RB5 Clone; 06-24-2009 at 02:11 PM.
RB5 Clone is offline   Reply With Quote
Old 06-24-2009, 04:36 PM   #12
Fred
Scooby Specialist
 
Member#: 3560
Join Date: Jan 2001
Chapter/Region: South East
Location: Four Oaks, NC
Vehicle:
06 STi, 98RS wagon
94 Open Light 2.5RS

Default

Bring it over to my house and I'll help you/ show you where to remove lots of weight. Done a few things with my rallyx RS, but I know where there's lots more - but it's not coming out of mine yet.
Fred is offline   Reply With Quote
Old 06-24-2009, 09:55 PM   #13
kwh29
Scooby Specialist
 
Member#: 22100
Join Date: Jul 2002
Chapter/Region: South East
Location: Durham, NC
Default

Your full STi drivetrain is heavy - remember the '04 WRX was still listed at 3080 or some such yet the '04 STi was almost 3400. All that weight is in drivetrain as the trim on an '04 isn't meaningfully heavier than the same year WRX.

Have you done the standard auto-x weight drop mods? JDM (or removed and replaced with zip ties) fender beams, Braille battery, changing all the doors to roll-up and yanking the extra wires from the harness, removing the bottom layer of the sunroof (saw that you already reskinned the roof. Nice!) etc? All of those things add up quick. Also there's a fair amount of just plain extra stuff under the car that you are legal to pull that auto-x people have to leave, like the tow tie downs and the block of iron under the crossmember. All the above added up can easily save more than 100lb.

You also have a rollbar, if only a 4-pt. That's +75lb or so that most street people don't have. Not that I'd remove it. With a car as capable as yours I'd personally go the other direction and upgrade to a road race legal cage.

--Kevin H.
kwh29 is offline   Reply With Quote
Old 06-24-2009, 10:22 PM   #14
MidLifeRally
Scooby Newbie
 
Member#: 131322
Join Date: Nov 2006
Default

Thanks Fred!You know I'll take you up on that! I would like your opinion on some set-up stuff as well. Kevin H., planning on running HPDE and TT the rest
of this year and get Chris Shimmel to finish the cage this winter. Again, was
just disappointed on how heavy she was. Anyone have any roll up windows
the want to trade? I already have light weight bumper beams, lighter hood
and trunk, re-skinned roof with no liner. Must be more pork somewhere!!
MidLifeRally is offline   Reply With Quote
Old 06-24-2009, 10:50 PM   #15
grippgoat
Scooby Specialist
 
Member#: 62182
Join Date: May 2004
Chapter/Region: NWIC
Location: Kirkland, WA
Vehicle:
2005 STI
White

Default

Quote:
Originally Posted by kwh29 View Post
Your full STi drivetrain is heavy - remember the '04 WRX was still listed at 3080 or some such yet the '04 STi was about 3250. All that weight is in drivetrain as the trim on an '04 isn't meaningfully heavier than the same year WRX.
Fixed.

-Mike
grippgoat is offline   Reply With Quote
Old 06-25-2009, 11:23 AM   #16
subydude
Scooby Specialist
 
Member#: 80649
Join Date: Jan 2005
Chapter/Region: South East
Location: Columbia, SC
Vehicle:
2000 2.5 Auto-X RSTi
What's A Head Gasket?

Default

Like everyone says, the swap adds a lot of weight to the car to begin with. The engine and tranny combo add about 225 lbs, brakes and rear end add at least another 50. Tack 275 onto 2825ish and you're at 3100 lbs with full stock interior.

But lighter hood, lighter trunk, all the metal NVH bits removed, a lot of "hidden" parts removed and it'll get down there. My 2910 is with the heavy stock bumper beams in place (if you're going for SM the JDM bumper beams are illegal). I think with removing the sunroof on mine and taking out a few more things from behind the dash I can get it down to 2820 with a full dash, and Ver 7 STi seats. That would be like getting a regular RS down to the 2550 lbs range. It's definitely possible, and unlike the anorexicSTi guy you won't be spending as much $$$.
subydude is offline   Reply With Quote
Old 06-25-2009, 11:15 PM   #17
ButtDyno
Street's closed, pizza boy
 
Member#: 17301
Join Date: Apr 2002
Chapter/Region: MAIC
Location: Why do they always say the Evo
Vehicle:
is the "dark side"
06 Evo #7 STU, 03 IS300

Default

AcquaCow's car (RS w/ 04/07 STi swap) was 2887, no rollbar.

http://forums.nasioc.com/forums/show...ghlight=scales
ButtDyno is offline   Reply With Quote
Old 06-30-2009, 05:35 PM   #18
vids
Scooby Newbie
 
Member#: 120113
Join Date: Jul 2006
Chapter/Region: International
Vehicle:
2002 WRX, full-race,
GT35, built engine, etc.

Default

In the floor, there is several bars that exists for crash safety. Take them out if you have a good cage. Also, every door has some solid metal in it that can be removed if you have a good cage, or are willing to take a chance without it... Certainly no more dangerous than driving an old car anyway...
I think there is about 10kg in every door.
vids is offline   Reply With Quote
Old 06-30-2009, 06:33 PM   #19
vinceGC8
Scooby Specialist
 
Member#: 72263
Join Date: Oct 2004
Chapter/Region: SCIC
Location: Los Angeles
Vehicle:
2008 Impreza STi
Dark Grey Metallic

Default

u remove the front and rear crash beams and go with lightweight battery?
vinceGC8 is offline   Reply With Quote
Old 06-30-2009, 06:35 PM   #20
MidLifeRally
Scooby Newbie
 
Member#: 131322
Join Date: Nov 2006
Default Subydude

PM me about the carbon fiber driveshaft. Sounds interesting. Any exp.
with one or know anyone with one? Fitment?
MidLifeRally is offline   Reply With Quote
Old 12-04-2009, 04:54 PM   #21
John2.5RS
Scooby Guru
 
Member#: 1140
Join Date: Mar 2000
Chapter/Region: SCIC
Location: On the road
Vehicle:
2013 Ecoboost'd F150
Grey

Default

I have my RSTI sitting at right around 2700 wet, without me in it.
That's with a 6-speed, R-180, BBK, etc.
It would be lighter without a cage or maybe a lighter, chrome-moly cage.
If $$$ is no object, look into a Lithium-Ion Battery (It's on my future 'wish-list )
Same ones found in top-end racing.

There's a lot of weight to be found in stuff you don't use much on the track.
Power windows, pwr. mirrors, foglights, stereo, extra wiring, etc.

You can find weight to lose, you just need to be creative!


I've had a CF driveshaft for a few weeks now. It's a nice mod, as long as you can deal with the quirks that come with swapping a 2-pc driveshaft for a one piece unit.

I think it was well worth it. MUCH lighter that the stock piece (less than half the weight, IIRC) and it fits good, but you either need to trim or removed the lower plate at the rear u-joint.

Last edited by John2.5RS; 12-04-2009 at 05:18 PM.
John2.5RS is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
WRX rim weight? P7 rim weight? jblaine Brakes, Steering & Suspension 3 12-18-2001 01:01 PM
X-Brand Tire Weight Vs. RE92 Weight ITR&RSGUY Brakes, Steering & Suspension 5 08-03-2001 10:26 AM
X-Brand Tire Weight Vs. RE92 Weight ITR&RSGUY Brakes, Steering & Suspension 0 08-02-2001 12:37 PM
99' wheel weight vs. 00' wheel weight? Dolphin Overton Brakes, Steering & Suspension 4 06-26-2001 04:21 PM
curb weight vs. gross weight mtn-boy Technical Forum Archive 2 08-05-2000 02:53 PM


All times are GMT -4. The time now is 05:51 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.