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Old 04-17-2011, 11:19 AM   #1051
u2_m4r1n3
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Quote:
Originally Posted by SoCal_Scooby
What do you guys think are the top 10 weight reduction mods? car needs to pass smog though so no air pump delete
What I did or have and is planned:
-Racing seats
-Firewall insulation
-Insulation under carpet
-Single exit exhaust (muffler delete drops more lbs)
-Lightweight battery
-remove spare tire kit
-DD stereo (I removed mine)
-Carbon fiber hood
-carbon fiber/aluminum driveshaft (not installed yet)
-lightweight rotors (planned)
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Old 04-17-2011, 11:36 AM   #1052
XanRules
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Carbon fiber is heavier than stock most of the time.
You do not need or want lightweight rotors.
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Old 04-17-2011, 11:49 AM   #1053
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Originally Posted by XanRules View Post
Carbon fiber is heavier than stock most of the time.
You do not need or want lightweight rotors.
That obviously depends on whether you have an aluminum STI hood or steel WRX hood.

Lightweight rotors are fine as long as you know what they're limits are and your intended uses. I've been using The Brake Man 2 piece front rotors on the street for almost 2 years without a single issue and they have both the lightest top hats and rotors available. I use Girodisc 2 piece on the rear.
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Old 04-17-2011, 12:29 PM   #1054
SUBYS R US
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Quote:
Originally Posted by A-man07 View Post
That obviously depends on whether you have an aluminum STI hood or steel WRX hood.

Lightweight rotors are fine as long as you know what they're limits are and your intended uses. I've been using The Brake Man 2 piece front rotors on the street for almost 2 years without a single issue and they have both the lightest top hats and rotors available. I use Girodisc 2 piece on the rear.
my WRX hood is light as crap. I this its the rs that has the steel hood
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Old 04-17-2011, 05:56 PM   #1055
u2_m4r1n3
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Quote:
Originally Posted by XanRules
Carbon fiber is heavier than stock most of the time.
You do not need or want lightweight rotors.
2008+ has steel hoods

That's why I said what I've done.
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Old 04-17-2011, 10:00 PM   #1056
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DBA front 2 piece rotors are very nice as well
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Old 04-19-2011, 03:14 PM   #1057
68Cadillac
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Originally Posted by JDwhiteWRX View Post
Nice. I'm copying that.
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Old 04-19-2011, 04:27 PM   #1058
u2_m4r1n3
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Agreed ^^^ I might have to copy that as well!
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Old 04-19-2011, 07:04 PM   #1059
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I have come to terms with the fact my Legacy is a tank and there isn't much I can do so I spent my time dropping as much rotational mass as I could and then removing weight from the higher points on the car and relocating heavier bits to lower COG areas.

Quote:
Originally Posted by gtasti View Post
DBA front 2 piece rotors are very nice as well
DBA Rotors are bolted and not directional vane. If you are lightening your car for better gas mileage and street use they are fine but if you are doing to attack the race track as hard as you can then get a set of 2pc floating directional vane rotors. They will cool better and not be as likely to warp when you start hammering on them.

Johann @ Girodisc
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Old 04-19-2011, 07:47 PM   #1060
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Old 04-19-2011, 08:07 PM   #1061
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Have to say I really like my Girodisc 2 piece rotors I have on the rear, and if I hadn't already purchased The Brake Man fronts I woudl have gone with Girodisc 2 piecers there as well.
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Old 04-19-2011, 09:19 PM   #1062
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Quote:
Originally Posted by 68Cadillac View Post
Nice. I'm copying that.
Cool I have been getting ideas from you too

Looking at the lower rad support brackets now, should be some good savings there as they are twice the size.
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Old 04-19-2011, 09:31 PM   #1063
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Quote:
Originally Posted by girodisc View Post
I have come to terms with the fact my Legacy is a tank and there isn't much I can do so I spent my time dropping as much rotational mass as I could and then removing weight from the higher points on the car and relocating heavier bits to lower COG areas.
Johann @ Girodisc
Johann do you have any plans to make your 2-piece rear rotors to suit 06 wrx 4pot/2pot setups?
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Old 04-19-2011, 11:18 PM   #1064
Str8Gone
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I just installed a Helix full Ti catback weighing 11.5 lbs. It replaced the greddy evo2 which weighed about 35lbs. It also got rid of that 2.5" taper that was on the greddy midpipe. Im sitting at about 2820lbs low on gas. I still need to remove my ac components.



Alot of lightness in this pic, aluminum DS and Ti midpipe.


Added some weight with this new shiftknob

Last edited by Str8Gone; 04-19-2011 at 11:26 PM.
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Old 04-20-2011, 12:12 AM   #1065
JDwhiteWRX
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Nice, how much weight does the aluminum DS save you?
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Old 04-20-2011, 03:58 PM   #1066
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Idk maybe 12 lbs, It frees up a good bit of hp... about 5%
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Old 04-20-2011, 09:36 PM   #1067
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I just ordered 10kg of dry ice, doing the sound deadening removal this weekend and hopefully the pad behind the dash.
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Old 04-20-2011, 09:46 PM   #1068
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Quote:
Originally Posted by JDwhiteWRX View Post
Nice, how much weight does the aluminum DS save you?
Quote:
Originally Posted by Str8Gone View Post
Idk maybe 12 lbs, It frees up a good bit of hp... about 5%
The lightest DS available, ACPT CF DS, saves 10 lbs over stock (14 lbs total since you have to ditch the heavy protection plate as well). The aluminum one won't be more than 7, maybe less.

5% hp gain would be about 15hp on an STi. Not even close. I could barely feel it when I swapped mine out. Let's try to avoid hyperbole as most of these changes we make by themselves make only very small differences.
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Old 04-20-2011, 10:17 PM   #1069
DamnThatRevLimiter
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Quote:
Originally Posted by A-man07 View Post
That obviously depends on whether you have an aluminum STI hood or steel .
Quote:
Originally Posted by SUBYS R US View Post
my WRX hood is light as crap. I this its the rs that has the steel hood
Quote:
Originally Posted by XanRules View Post
Carbon fiber is heavier than stock most of the time.
Quote:
Originally Posted by u2_m4r1n3 View Post
2008+ has steel hoods

That's why I said what I've done.
My 2002 wrx has a aluminum and as far as i know it is stock ,to check use a magnite ,it stuck to my fenders but not my hood. also aluminum does not spark when grinding on ,but steel sparks yellow/orange and titaniumsparks white. about 2008 hood idk check them out.




Quote:
Originally Posted by JDwhiteWRX View Post
Nice, how much weight does the aluminum DS save you?
Quote:
Originally Posted by Str8Gone View Post
Idk maybe 12 lbs, It frees up a good bit of hp... about 5%
Quote:
Originally Posted by A-man07 View Post
The lightest DS available, ACPT CF DS, saves 10 lbs over stock (14 lbs total since you have to ditch the heavy protection plate as well). The aluminum one won't be more than 7, maybe less.

5% hp gain would be about 15hp on an STi. Not even close. I could barely feel it when I swapped mine out. Let's try to avoid hyperbole as most of these changes we make by themselves make only very small differences.
Some of those weights seem more drastic than i remember i have an aluminum one and I Hate it . Fitment is horrable you have to bang on this cut that blah blah. Should fit like a glove. Also mine causes a vibration from 80mph to 120mph that i have notice .I would take a stock Sti one over mine 10 times out of 10. The weight difference of mine was not more than a couple pounds . I also could have a poor quality one , i imagine quality control is not a high priorty search the forums and other people have had problems too.

I am Not trying to hate or be a jerk i just want to make fellow subaru owners aware of my experience.
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Old 04-20-2011, 11:43 PM   #1070
Str8Gone
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The aluminum DS is lighter than the carbon but it a pita to fit properly. I managed to gain a tenth in the quarter by switching to alum DS. I run very consistent so I can notice small improvements.
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Old 04-21-2011, 03:17 AM   #1071
JDwhiteWRX
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So I took off the big horse shoe (u-brace) and drove around for a week with it removed while waiting for the h-brace to show up, didn't notice any difference without it except the steering feels lighter because I dropped another 11kg off the front end

The h-brace is not meant as a replacement for it, it is meant to bolt to it and tie it all together. What I have done is remove the u-brace altogether and use a couple of cheap sockets as spacers where the u-brace would usually be (see below).



I also bought one of these so I can still mount the plastic undertray http://oswaldperformance.com/WRXUNDERTRAYMOUNTKIT.aspx

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Old 04-21-2011, 05:31 AM   #1072
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Post whoring now but Just knocked this up before dinner, came out pretty good

Replaced solid steel bonnet prop with hollow aluminium home made one.









Cost me $10 for material and about 40 minutes of my time :-D
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Old 04-21-2011, 06:10 AM   #1073
A-man07
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Quote:
Originally Posted by JDwhiteWRX View Post
So I took off the big horse shoe (u-brace) and drove around for a week with it removed while waiting for the h-brace to show up, didn't notice any difference without it except the steering feels lighter because I dropped another 11kg off the front end

The h-brace is not meant as a replacement for it, it is meant to bolt to it and tie it all together. What I have done is remove the u-brace altogether and use a couple of cheap sockets as spacers where the u-brace would usually be (see below).

I'm afraid you may have defeated the purpose of the H-brace by having to use the spacers (sockets). Under load you'll get lateral deflection there as the mounting tab isn't flush to an area of frame.

Whiteline makes a brace that can be used with the subframe removed.
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Old 04-21-2011, 06:25 AM   #1074
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Quote:
Originally Posted by A-man07 View Post
I'm afraid you may have defeated the purpose of the H-brace by having to use the spacers (sockets). Under load you'll get lateral deflection there as the mounting tab isn't flush to an area of frame.

Whiteline makes a brace that can be used with the subframe removed.
I looked at the whiteline version (like yours) but because I have a 5-speed gearbox it means I would have to remove the brace each time I changed gearbox fluids and because the way it bolts up with the bolts that go through the front control arm bushings this would be a major PITA.

I could possible make up some better aluminum spacers that lock the brace against the chassis more in a lateral direction.
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Old 04-21-2011, 06:42 AM   #1075
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Originally Posted by Str8Gone View Post
Idk maybe 12 lbs, It frees up a good bit of hp... about 5%
Don't believe everything you read please. That comment is lol funny.
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