Thứ Ba, 1 tháng 11, 2016

Weight Reduction part 29

Splinter 02-24-2013 12:18 PM

My 6-speed 98 is at 2790 with me in it :P
b3delta 03-02-2013 01:29 PM

Got the Driveshaft Shop Al driveshaft on my 03 5spd. Fitment was an issue at first, but some grinding got it in. I love it, unlocks power and torque and combined with a lw flywheel and crank pulley, what a difference. Not to mention Al will "flex/stretch" I believe 20% more than steel which is why it's a lil easier on hard launches than the steel driveshaft, I'm not sure on the CF, but they're $800 more expensive for 1-2 lb difference, but do have better fitment
chrispsti 03-02-2013 02:43 PM

I just ordered a driveshaft shop cf driveshaft! Should be done soon hopefully! My car is pretty heavily modified so im hoping for some good improvements. Il write a review after i get it installed.
bue car 03-02-2013 07:07 PM

I want a new propeller shaft...
chrispsti 03-02-2013 09:26 PM

[quote=b3delta;39265776]Got the Driveshaft Shop Al driveshaft on my 03 5spd. Fitment was an issue at first, but some grinding got it in. I love it, unlocks power and torque and combined with a lw flywheel and crank pulley, what a difference. Not to mention Al will "flex/stretch" I believe 20% more than steel which is why it's a lil easier on hard launches than the steel driveshaft, I'm not sure on the CF, but they're $800 more expensive for 1-2 lb difference, but do have better fitment[/quote]

I was reading reviews of the aluminum driveshaft and it seems like a great upgrade. Its encouraging that you noticed an immediate difference. Im hoping for the same
Str8Gone 03-03-2013 07:29 PM

They are a great upgrade, huge difference I think. I bought mine used with small gashes in it and I had a balance problem at 125mph+ so I sold it. Looking to get a brand new one with hopefully no balancing issues.
Rally STi Guy 03-03-2013 08:09 PM

I also have an aluminum drive shaft and its really nice. The best part is that it has replaceable u joints.
A-man07 03-03-2013 08:40 PM

I may be an outlier here, but I didn't find the CF driveshaft to make much difference in driveline feel. It is a valuable part of my weight reduction and the ACPT shaft I have has been issue free, but it is pricey. Honestly, upgrading the trailing link bushings made a world of difference improvement in driveline feel over the CF DS, but again, I wouldn't trade it back.
b3delta 03-03-2013 09:00 PM

If it isn't balanced right just send it back to the company and they'll balance it, just like a rim, it'll have small weight tacked onto it. Biggest difference I felt honestly was the crank pulley, not sayin I couldn't feel it with the DS but the crank pulley was like the engine breathed a sigh of relief.

On the downside, it does suck that if we end up doin a 6 spd swap we gotta get a different DS.

A-man! good to see you, been a fan of ur thread (and of course anorexicsti) on iwsti. I agree that bushings can make a big difference, I just did shifter bushings and the shifter feels much better. As for price, that's the main reason I went with the AL DS instead of the CF, I can make up for the 2 extra pounds somewhere else. (my stomach is where I should start)
Uncle Scotty 03-04-2013 02:33 AM

[quote=Splinter;39197990]Damn, 12 years and all you've done is a lighter battery? Are you on a racing team? Team 3 Toed Sloth?

You might not think grams matter, but my numbers speak for themselves. Now, if only I had the driving skills to match my car... :/[/quote]


cupcake....
i dont post everything i do....do NOT ASSume
b3delta 03-04-2013 09:44 PM

Anyone cut out excess wires from the wiring harnesses? One of those things that would add up after a while, and would prob need a complete teardown to get it all. I'm considering it, once I can get my hands on a spare harness in case i mess it up. I figure it'd one help with weight, two reduce interference and load in the system, three allow for removal of other crap that isn't used or already removed. But definitely something that needs to be done slow and methodically to ensure proper connections are kept, good soldering job etc

I tried doing it when I did my TGVs, but saw that Subaru had used silicone type goo to cover some of the connections, meaning some parts would need to be completely removed and replaced with new wire
kozak 03-04-2013 09:51 PM

I'm nearly done, on the way to taping/wrapping the new harness. I haven't weighed everything yet, but the harness is much smaller now, plus you can re-route and reposition some things slightly. Most wires are simply pin-out from both ends, so less need for soldering.
b3delta 03-04-2013 10:07 PM

I figured it'd be way smaller. I know Id be losin the TGV stuff, antennae, cruise control, side airbags, all the empty plugs for features not on my car, DRLs, 3rd brake light (got the spoiler), rear O2 sensor, man the list goes on. Where'd u get the second harness from? I know they're expensive as hell from Subaru directly.
b3delta 03-04-2013 10:15 PM

Plus could rig up switches an stuff for things like flashing the ECU, or whatever u need, make nice clean install.
Splinter 03-04-2013 11:40 PM

[quote=b3delta;39282544]Anyone cut out excess wires from the wiring harnesses? One of those things that would add up after a while, and would prob need a complete teardown to get it all. I'm considering it, once I can get my hands on a spare harness in case i mess it up. I figure it'd one help with weight, two reduce interference and load in the system, three allow for removal of other crap that isn't used or already removed. But definitely something that needs to be done slow and methodically to ensure proper connections are kept, good soldering job etc

I tried doing it when I did my TGVs, but saw that Subaru had used silicone type goo to cover some of the connections, meaning some parts would need to be completely removed and replaced with new wire[/quote]

I took about 30lbs out of my harness, including relays and modules. But I don't even have a dome light anymore so YMMV
[IMG]http://sphotos-f.ak.fbcdn.net/hphotos-ak-ash3/859468_10151468609124609_1929259622_o.jpg[/IMG]

Engine bay is gutted.
b3delta 03-04-2013 11:47 PM

Holy clean... so there is an engine somewhere in that bay. I'll find it one day when I can remove all that wiring
bue car 03-05-2013 12:53 AM

Just be very careful. I asked a wiring guy to strip mine, he said it's much better to make one from scratch with your needs. Too many things interact. Money wasn't even the issue...
Splinter 03-05-2013 01:21 AM

Yea it took me a ridiculous amount of time to strip and debug my wiring harness. Lots of weird problems showed up after that took me a long time to fix.

I'm currently in school taking aircraft mechanics, once I'm done I'll probably make myself a new harness from scratch up to aircraft specs :P
b3delta 03-05-2013 10:41 AM

What intake manifold is that? Cosworth that you polished?
bue car 03-05-2013 11:38 AM

Looks to be a OEM 97? or is that 98 1.8 or 2.2 manifold, EGR on the top right.
Splinter 03-05-2013 07:41 PM

[quote=bue car;39286238]Looks to be a OEM 97? or is that 98 1.8 or 2.2 manifold, EGR on the top right.[/quote]

No EGR

It's a V4 STI, I cut off the bosses for the coil pack.
brendan04wrx 03-07-2013 10:36 AM

I'm almost done w my rewire and I've pulled 725 feet of wiring!! haven't weighed it yet but its def a big difference
gtasti 03-10-2013 10:30 AM

Re wire do u mean the whole harness ?

Weight the air bag stuff if anyway took it all out I'd like to remove mine consider I only have the passenger one left in the car which I plan to take out as well
vicious_fishes 03-11-2013 09:22 PM

[quote=b3delta;38488046]for those who removed the fron bumper beam, how did you reattach the bumper? all the popits plug into the beam so whats holding ur bumper on?[/quote]
basically, the remaining ones hold it on. as a result, there's great big gaps below the headlights. looks bloody ugly but hey, 12kg or whatever it is, removed from where it is...
[quote=bue car;39191967]valve covers?[/quote]

[quote=Rally STi Guy;39192046]Agreed, how did you get rid of them? (Valve covers)[/quote]

sorry guys i meant the injector covers. the fat heavy things that bolt onto the manifold.

[quote=gtasti;39194235]1 rad fan is that a wise one ?

I'd assume the pass side one was removed
And are u running the stock one still[/quote]

[quote=Danny5;39194560]Most cars have a second radiator fan just for the Air Conditioning.[/quote]

this.
[quote=Str8Gone;39208078]Which fan can be removed if you dont have AC?[/quote]
not sure which side it is for LHD but mine was on the right/drivers side.

drive your car, park it with the engine running and eventually one of them will come on. whichever one didn't, you chuck.
b3delta 03-16-2013 11:28 AM

bravo vicious_fishes
bue car 03-16-2013 01:43 PM

Haha ok I was like, no valve covers, WTH lol
Himynameisgreg 03-19-2013 03:07 PM

i need to get on a lot of those little things. read the first 20 and last 40 or so pages of this thread. most of you guys are trying to keep your cars street legal, so not a ton of extra ideas for me. but there are a few, like the charcoal box.
my sti was at 2880 last i had it weighed without me and with 1/4 tank of gas. and that's with a wrc rollcage lol.

taken out quite a bit since as well. getting it ready for the upcoming season. need to get rid of as much as possible so it's still light when i add my front splitter and rear diffuser.

just took out the windshield wiper motor and wipers last night. looking for more lost cost reductions.
bue car 03-19-2013 04:20 PM

[quote=Himynameisgreg;39391618]just took out the windshield wiper motor and wipers last night. looking for more lost cost reductions.[/quote]


good bye misty track days and nights. :sadbanana:
Himynameisgreg 03-19-2013 05:27 PM

rain-x bro!

a couple of other teams out here just spray down the windshield with rain-x and go and have had pretty good success. however, i don't have a set of rain wheels/tires, so i probably wouldn't be participating anyway :(
bue car 03-19-2013 05:54 PM

Haha


On a good note, lost another 5 pounds from the driver seat! :D
chrispsti 03-19-2013 06:46 PM

1 Attachment(s)
driveshaft shop made....baxter approved! My cat really likes carbon fiber i guess :D
gtasti 03-20-2013 08:01 PM

[quote=chrispsti;39393444]driveshaft shop made....baxter approved! My cat really likes carbon fiber i guess :D[/quote]

Hey lmk if u get any vibration at higher speeds
chrispsti 03-20-2013 08:53 PM

[quote=gtasti;39402679]Hey lmk if u get any vibration at higher speeds[/quote]

Will do. Im assuming your referring to highway speeds. Im just waiting for the weather to warm up to do the install
RRR 03-25-2013 04:39 PM

[quote=u2_m4r1n3;38630111]I relocated the reservoir to the rear, its pretty straight forward.

Coilovers will be the money maker in weight distribution. You can adjust ride height to shift weight, I highly recommend it if you're serious.

On the M3 I went from a 50/50 stock distribution sitting at 3420 lbs to 2980 and a 49/51 split. Before I added Coilovers I was around a 56/44 split. Those Coilovers did good![/quote]


Late response here, but Im not on the same page as you on this one.
The rear problem with weight (in turns) is centrifugal forces. Now weight in the front is still weight in the front if you raise the front end..... Im not saying your approach is wrong, however Im not shure that 5050 distribution really helps if its obtained simply by lowering the rear end...
dub c 03-27-2013 02:12 PM

Does anybody know who makes a FRP hood for 02/03 WRX's?
OEM style, without any vents.
I tried Velocity Carbon but all they do is trunks now.
Preludicrous 03-27-2013 07:07 PM

[quote=RRR;39437540]Late response here, but Im not on the same page as you on this one.
The rear problem with weight (in turns) is centrifugal forces. Now weight in the front is still weight in the front if you raise the front end..... Im not saying your approach is wrong, however Im not shure that 5050 distribution really helps if its obtained simply by lowering the rear end...[/quote]

I's not as black & white as just raise/lower the front or rear. What he is referring to is called "corner weighting," it is practiced by most teams in many genres of racing. Basically your car sits on 4 individual scales (one under each wheel), then you adjust each coilover individually to distribute the car's weight in a manner that benefits your needs. This method is somewhat time consuming and requires a lot of trial and error adjustments. Remember, it all (weight) goes somewhere so you might dial the left front right where you want it and now your right rear is way out of whack.
My brother used to work for a circle track team that had a machine that could do all the adjustments with the strut/coilover completely removed from the chassis. Very cool.
Most people only view coilover suspensions as an aesthetic improvement and don't even realize the true performance gains that can be had through proper adjustment.
RRR 04-01-2013 04:46 PM

[quote=Preludicrous;39455764]I's not as black & white as just raise/lower the front or rear. What he is referring to is called "corner weighting," it is practiced by most teams in many genres of racing. Basically your car sits on 4 individual scales (one under each wheel), then you adjust each coilover individually to distribute the car's weight in a manner that benefits your needs. This method is somewhat time consuming and requires a lot of trial and error adjustments. Remember, it all (weight) goes somewhere so you might dial the left front right where you want it and now your right rear is way out of whack.
My brother used to work for a circle track team that had a machine that could do all the adjustments with the strut/coilover completely removed from the chassis. Very cool.
Most people only view coilover suspensions as an aesthetic improvement and don't even realize the true performance gains that can be had through proper adjustment.[/quote]


Agreed, corner weight can make wonders, and you are absolutely correct.

However, what we discussed here was the weight distribution on the tires front VS rear. If you want 50/50 on the common 60/40 impreza, you would have to raise the front end sky high or lower it a lot in the rear end. Im not saying its wrong, I just question weather or not that would be good for the handling or not.

I believe the centrifugal forces has more impact. Just look at the Audis, with their engine mounts attached to the front bumper, they undeersteer like a horce on ice! I believe, though I cant really say 100% for shure, that if you take that audi, or impreza or any other off balance car and lower the rear or raise the front, you could actually make things worse. The centrifugal weight distribution is still terrible, and with less weight on the front wheels, you now have less grip and in turn makes the front end understeer even more.

I could be completely wrong.
chrispsti 04-01-2013 04:48 PM

1 Attachment(s)
Installed my carbon fiber driveshaft today! Install was really easy and only required 14mm, and 12mm socket/wrenches. Had it done in about an hour and it was definitely worth it. The bounce i used to have when letting off the gas or getting on it quick is gone. Shifting/downshifting feels lighter and smoother when letting off the clutch, and according to the "butt dyno" it feels like i have picked up a little bit of power...nothing overwhelming, but noticeable. Old unit with the bolts and collar i removed is close to 30 lbs...the new unit is around 13 lbs. Did one pull to 80ish and their was a slight hint of vibration but nothing much. Really happy with the product that The Driveshaft Shop put out.
dub c 04-08-2013 04:47 PM

[quote="dub c;39453261"]Does anybody know who makes a FRP hood for 02/03 WRX's?
OEM style, without any vents.
I tried Velocity Carbon but all they do is trunks now.[/quote]
I am also interested in this. :rolleyes:
Mikeyalpine 04-09-2013 03:26 AM

Im not sure if this is a good way or bad way to do things, but i drilled a 1/64" hole in the gas cap when i deleted the evap crap on several of my gm vehicles. I felt better about it than leaving hoses open (could be a bad idea in a rollover, fire situation) or completely sealing the fuel system and possably blowing a hose, seal what ever, if things got to pressurized. The only down side yet, and I did my firebird ten years ago, is you can hear a hiss from the cap when i park it if i take it for a good hard burn on a low tank. Not much smell of fuel vapour though which is good :)

[quote=u2_m4r1n3;35909331]From my weeks of internet research, yes. lol.

basically the fumes of the fuel create the pressure and the fuel pump helps as well. Not sure of the science behind it, but they work hand in hand... makes sense I guess.

there are 2 ways to go about it, put the 1 way valve or plug the hose. I've read people doing both, some plugging the hose and claiming fuel cap lets air in and out and will last just fine and others saying that plugging it will cause too much pressure and weaken the gas tank quicker (not months) than if it was vented; hence why some people vent it. I've also read that some people just leave the hose as is and zip tie up some where open.

I prefer to start with the 1-way vent, it's a good middle area to start; if it doesn't work i can always plug it. worst than can happen with the 1-way vent is that there isn't enough pressure. If thats the case (which I'm sure it wont be) then i know leaving the hose open to flow both ways would not be good either, since the air pressure would be equal to the exterior, therefore no pressure in the tank.

I'm doing it to my car next week sometime; hopefully by Wed.[/quote]
Mikeyalpine 04-09-2013 03:32 AM

And this has been said already in this topic, but please dont mess with bumper supports, knee plates under the dash and so on ... I had a very light cavalier and had a guy blow a stop sign and I hit him only doing 60 kph, but im still in rough shape because of it. Airbags (which i didnt have... 88 Z24) seat belts, bracing, ect are all there for a reason ;)
Splinter 04-09-2013 09:43 AM

[quote=Mikeyalpine;39548385]And this has been said already in this topic, but please dont mess with bumper supports, knee plates under the dash and so on ... I had a very light cavalier and had a guy blow a stop sign and I hit him only doing 60 kph, but im still in rough shape because of it. Airbags (which i didnt have... 88 Z24) seat belts, bracing, ect are all there for a reason ;)[/quote]

Considering my daily driver is a 1983 Brat with none of that stuff from the factory, I fail to see the difference in removing it from my Impreza.

[quote=Mikeyalpine;39548379]Im not sure if this is a good way or bad way to do things, but i drilled a 1/64" hole in the gas cap when i deleted the evap crap on several of my gm vehicles. I felt better about it than leaving hoses open (could be a bad idea in a rollover, fire situation) or completely sealing the fuel system and possably blowing a hose, seal what ever, if things got to pressurized. The only down side yet, and I did my firebird ten years ago, is you can hear a hiss from the cap when i park it if i take it for a good hard burn on a low tank. Not much smell of fuel vapour though which is good :)[/quote]

When I had to put a fuel cell in my Brat to replace the rusty gas tank, I put in a vent line with an off the shelf rollover valve and a cheap plastic inline fuel filter to keep it from getting full of spiders.
gtasti 04-20-2013 09:20 AM

Can someone en lighten me how to do the magnet truck spring trick
Getting a spec c truck soon and would like to know how to remove the springs
A-man07 04-20-2013 09:45 AM

[quote=gtasti;39636594]Can someone en lighten me how to do the magnet truck spring trick
Getting a spec c truck soon and would like to know how to remove the springs[/quote]

The stock springs will pop out of their retainers but you have to be kind of forceful.

I have a Spec C trunk and the difference was obvious. Of course it meant I was able to ditch the STi wing as well.
gtasti 04-20-2013 12:08 PM

[quote=A-man07;39636690]The stock springs will pop out of their retainers but you have to be kind of forceful.

I have a Spec C trunk and the difference was obvious. Of course it meant I was able to ditch the STi wing as well.[/quote]

Yeah I'm going wingless as well but would like to put in the magnet setup so the trunk stays open in the wind

Thanks for the input on the springs tho do you not have any springs at all Aman
dub c 04-20-2013 12:10 PM

[quote="dub c;39453261"]Does anybody know who makes a FRP hood for 02/03 WRX's?
OEM style, without any vents.
I tried Velocity Carbon but all they do is trunks now.[/quote]
Come on!
dub c 05-06-2013 12:18 PM

Bump!

:lol:
richy_21 05-06-2013 11:35 PM

Just removed my rear bumper beam. Thinking about getting a Oswald tho.
gtasti 05-11-2013 07:38 PM

Installed spec c trunk huge weight saving over stock with a wing
Str8Gone 05-11-2013 07:42 PM

I went with a used seibon trunk many years ago, not sure of the savings over a wingless stock trunk. I want to get the DSS alum shaft back on, I really miss the performance of it.
vicious_fishes 06-11-2013 07:08 PM

[quote=Str8Gone;39787174]I went with a used seibon trunk many years ago, not sure of the savings over a wingless stock trunk. I want to get the DSS alum shaft back on, I really miss the performance of it.[/quote]

the seibon trunk is 4kg lighter than the stock trunk. you don't weigh the wings with them etc, christ. there is 4kg difference in the trunks ALONE.

basically, it's not really worth it unless you get it 2nd hand/for cheap. you're looking at well past $100/kg to save weight from the BACK of the car.
bue car 06-11-2013 10:51 PM

You could just cut out the supports on the inside and just leave the skin... hehe
DamnThatRevLimiter 06-15-2013 12:10 AM

[quote=dub c;39453261]Does anybody know who makes a FRP hood for 02/03 WRX's?
OEM style, without any vents.
I tried Velocity Carbon but all they do is trunks now.[/quote]


Mine Says VIS but the shroud/Baffle fits bad so i think its a fake one. It was free ,so i dont care too much.
vicious_fishes 08-26-2013 02:47 PM

so what parts have you guys bought/had fabbed up to save weight?

this guy:

[quote=mtcs;38770562]New moly transmission cradle

-9 lbs over stock
[IMG]http://i265.photobucket.com/albums/ii229/mtcs83/492a3a604561d6af4ffc48e23430fe9d.jpg[/IMG]
[IMG]http://i265.photobucket.com/albums/ii229/mtcs83/C3810ACF-CDDA-4103-BB8B-5EA76E508D3C-429-0000003FAA9FD2D5.jpg[/IMG]
[IMG]http://i265.photobucket.com/albums/ii229/mtcs83/6C40E354-2353-46FD-B2EB-90BF9A97C1A4-429-0000003FB1AF58E9.jpg[/IMG]
[/quote]

had a gearbox crossmember fabbed up to save 4kg. anyone else had stuff done?

new rear subframes can be bought for $texas but i'm not sure what else?
bue car 08-26-2013 03:00 PM

neato!
gtasti 08-26-2013 09:31 PM

Check out tssfab they make affordable cross members
midwest impreza 09-24-2013 07:36 PM

Regarding the removal of the rad fan dedicated to the AC. Someone in this thread said once they removed it the other fan ran constantly. How do you get the other fan to run normally?
A-man07 09-25-2013 06:01 AM

[quote=midwest impreza;40653441]Regarding the removal of the rad fan dedicated to the AC. Someone in this thread said once they removed it the other fan ran constantly. How do you get the other fan to run normally?[/quote]

I removed my driver's side fan on my 07 and the remaining fan ran normally. When I did my turbo upgrade and built engine, my builder told me this was a big no no and put the fan back in :)
yebokmj 09-25-2013 08:01 AM

Did he say why it was a bad idea? I have deleted my AC and that was my next thing
midwest impreza 09-25-2013 10:05 AM

^oh thats because the driver side fan is the main fan and the passenger side is the ac fan. main fan no. ac fan yes.

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