Weight Reduction

[0BlueSTi4]

Originally Posted by bue car

you mean all the years i have put into reducing the weight of my cars is negated by my close friends?

or worst yet...your family...you never know

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[0BlueSTi4]

Originally Posted by JDwhiteWRX

GTR is a heavy and expensive car compared to an Impreza, a guy in our club has one and has to replace a set of $1300 rotors after every track day. Sure its fast, like amazingly quick around the track, but you got to pay if you want to play.

I know what you mean. I owned one for two years and maintenance cost along while trying to stay warranty friendly was a crunch and a disability.

[0BlueSTi4]

Originally Posted by vicious_fishes

i'm sure if you spent the $100,000 difference in the cost of the cars you could spank the gtr

then again you don't drive around tracks with your fat friends in the car do you?

and saying that people who think saving hundreds of pounds does a lot are crazy?

you=clueless

Wow somebody took that personally. I never said weight reduction was not important. All I said is that you could be crazy if you do and if you don't.

Let's see 2009 GTR out the door set me back $93k while 2011 WRX was $27k(that's in US $s) - so not entirely sure where $100k difference came from.

[0BlueSTi4]

Originally Posted by DamnThatRevLimiter

http://www.motortrend.com/roadtests/...91&188,shopper
So the GT becomes a GT-R. The world's fastest sub-$100,000 car; $75,000 to $80,000 is the likely price range
3.8L/480-hp/434-lb-ft twin turbo DOHC 24-valve V-6
Curb weight 3836 lb (mfr)
power to weight=7.999999etc.
PERFORMANCE (C/D EST):
Zero to 60 mph: 3.5 sec
Standing ¼-mile: 11.7 sec
http://www.google.com/url?q=http://w...5XZmZhfkLdOO2Q
http://www.google.com/url?q=http://w...AEmjCAQoW7Pctg
http://www.modified.com/features/061...x/viewall.html

You can also youtube time attack of Opera's cars against other tuners , to note that shop doesn't increase power just decrease weight.
You can also do your own math on how to get a subaru to match the GT-R's perfomance and power to weight ratio .
granted not everyone will do that or track there car but this thread is for pro-weight reduction if your anti-weight reduction please use facts and figures at least.

Why did you pick the slowest and weakest GTR of them all? How about 2012?

And yes it is a pig and it is expensive yet it goes round the track faster then lighter and more powerful and more expensive 911 turbo - good luck replicating that while remaining comfortable and civilized.

[DamnThatRevLimiter]

Originally Posted by 0BlueSTi4

Why did you pick the slowest and weakest GTR of them all? How about 2012?

And yes it is a pig and it is expensive yet it goes round the track faster then lighter and more powerful and more expensive 911 turbo - good luck replicating that while remaining comfortable and civilized.

Just looked up 2009 because alot of the ones in my area that i see are 2009 , people most likely raced to buy them when they first came out. the civility of our cars would deminish at those levels. BTW if any one does race a GTR I would be curious to see the results, gotta post it! The GTR is a good bench mark ( ruler) to measure performance. If you can beat a GTR most likly you would employ every weight savings trick and speed trick out there!

[Ernest]

Originally Posted by DamnThatRevLimiter

Just looked up 2009 because alot of the ones in my area that i see are 2009 , people most likely raced to buy them when they first came out. the civility of our cars would deminish at those levels. BTW if any one does race a GTR I would be curious to see the results, gotta post it! The GTR is a good bench mark ( ruler) to measure performance. If you can beat a GTR most likly you would employ every weight savings trick and speed trick out there!

No dig on the GTR - it is a great car, but the 911 is way nicer and refined. I would never pay all that money for a Nissan. For the price of the GTR I can get a used 993 turbo and an new STI - perfect summer/winter ride combo.

[vicious_fishes]

back to weight reduction:

interesting to note that the OEM steering wheel/airbag only weighs 2.7kg. would have thought it would be more than that.

[gtasti]

The dash one I bet is a lot heavier

Anyone weight stock sti seats vs Jdm ones yet ?

[68Cadillac]

Steering Wheel SRS Airbag 0.983 kg


Dash SRS Airbag 2.974 kg


Seat Airbags x2 2.164 kg


SRS Control Module 0.669 kg


SRS underseat wiring brackets 0.171 kg Second bracket sits the left of the scale.


SRS Front Frame Rail G-meters 0.697 kg


SRS B-Pillar G-Meters 0.434 kg

Total SRS weight 8.092 kg excluding wiring.

[bue car]

you stay busy!

[gtasti]

How hard was it to remove dash one ?

I've had my dash off before that's easy part

[68Cadillac]

Originally Posted by gtasti

How hard was it to remove dash one ?

I've had my dash off before that's easy part

No need to remove the dash.

Remove the glove box.
Unbolt the three bolts holding the bag cradle to the dash bar.
Undo the wiring. Hardest wires to undo in the whole car.
Pull/Push the whole thing out through the top of the dash. Cover and all.
Separate cover from bag and reinstall in dash.

[68Cadillac]

For a HPDE I "stripped" the interior removing the passenger seat, rear seats, and cargo area false floor. Added a large fire extinguisher and a DIY front wind splitter.


To mark the occasion I rolled over to the C.A.T.S. for a weigh in. Down to 1242.8 kg with 9/16 full fuel tank. A full tank of fuel weighs 44.7 kg.

Mass of my Subaru for HPDE
Less Airbagless Passenger Seat 18.51 kg
Less Rear Seats 18.42 kg
Less Cargo Area 4.08 kg
Plus Safety Harness 1.172 kg
Plus Fire Extinguisher 4.395 kg
Total: -35.443 kg
1262.35 kg: curb weight (full of fuel), or
1217.65 kg: dry weight (no fuel)


Mass of my Subaru for Daily Driving
Plus Airbagless Passenger Seat 18.51 kg
Plus Rear Seats 18.42 kg
Plus Cargo Area 4.08 kg
Less Fire Extinguisher 4.395 kg
Less Safety Harness 1.172 kg
Total: +35.443 kg
1297.79 kg: curb weight (full of fuel), or
1253.09 kg: dry weight (no fuel)

Mass of my Subaru as it rolled off the ship
1435.62 kg: curb weight (full of fuel)

Total Mass reduction for HPDE: 173.27 kg (382.00 lb) 12.1% lighter.
Total Mass reduction for Daily: 137.83 kg (303.86 lb) 9.6% lighter.

[kpluiten]

Originally Posted by 68Cadillac

FYI -

There is no weight savings to be had in the aftermarket all-aluminum radiators.



From this post.

This is no longer true. Koyo has a new version of their GD chassis radiator. It is thinner and lighter. It weighs 7lbs 13.25 oz with no fluid, fans, or cap, which is a couple of ounces lighter than the stock unit. The picture you quoted is the new design. The old design was about twice as dense and used a less efficient fin design/density.

[rocketperson7]

Originally Posted by 68Cadillac

To mark the occasion I rolled over to the C.A.T.S. for a weigh in. Down to 1242.8 kg with 9/16 full fuel tank. A full tank of fuel weighs 44.7 kg.

Mass of my Subaru for HPDE
1262.35 kg: curb weight (full of fuel), or
1217.65 kg: dry weight (no fuel)

Mass of my Subaru as it rolled off the ship
1435.62 kg: curb weight (full of fuel)

Total Mass reduction for HPDE: 173.27 kg (382.00 lb) 12.1% lighter.

I've read through a good part of this thread before, and it seems that you're one of the main contributors, and I think that's very impressive

could you give a quick rundown of what "creature comforts" are lost? from what I can tell from the pictures that aren't related to the rear being gutted, you've lost ac, cruise, and airbags, anything else? it seems like with just a little bit of care taken that losing 150-200lbs is quite attainable with a full interior and ac (what I want)

[68Cadillac]

I still have the full AC system installed and working. I even used it while waiting in grid just before my run group received the green flag. Gets a little hot waiting there. I normally run a full interior excluding the "o **** handles" and rear seat head rests. I reinstalled the passenger seat, rear seats, and cargo area false floor this evening.

Thanks for the correction on the Koyo Radiator.

[gtasti]

How much are those new koyo rads

I'll be going on the scales soon I'll post up my results

[b3delta]

ever get the How to for the EVAP delete? im gonna tinker around with mine this weekend and drop some more weight. Just to chime in I got the exedy flywheel, Perrin LWCP and DSS Al Driveshaft and no issues. Removed most of the basic stuff, but gonna dig in and find some, maybe have Mr. Dremel gimme a hand.

[b3delta]

btw just removing the front subframe, full SS headers/exhaust, battery relocation, and removing heatshields, was enough to cause a significant ride height change in the front, so if you're worried bout the look and ride height here is your warning about the car diet.

Also, with the whole Ti debate. Titanium while very light and strong, is still heavier then Al. IDK if they make Al exhaust, or if it would hold up to the heat, but thatd be the lightest feaseable material.

Another idea for fighting heat and keeping weight down, anyone considered an aerogel heat shield? I know the stuff can be machined and holds shape while weighing next to nothing (the stuff is like 99% air or something) yet it has ridiculously low thermal conductivity. http://www.buyaerogel.com/ this has it in tiles, wraps, and loose granules. Seems to be a hell of a way to combat heat while not adding wieght. Fighting heat is just as important as dropping weight IMHO.

[KelConquer]

Might as well post what I've got going on, all AC and cruise hardware removed, wiper fluid res removed and intake silencer, among various other things I've taken out along the way. Opened up my hood scoop so it's functional and removed all hood liner. My motives are having a lighter engine bay obviously (save gas!), something to keep me busy (I'm an aspiring mechanic so I love working on my car), and everything I've taken out I don't use. So it's nice to have all of that out of the way for when I need to make more drastic repairs.



I also have the legacy front bumper with the large fog light inserts, no fog lights though so my intake is run though the right insert straight up to the stock box. Interior is gutted out as well, wagon coupe!

[gtasti]

Had my car on the scales came in on 3024lbs without me in it
04 sti

[mxer254]

Originally Posted by gtasti

Had my car on the scales came in on 3024lbs without me in it
04 sti

with how much fuel? last time my 04 wrx was on the scales it came in at 2973 with a 1/4 tank of fuel without me in it

SS headers going on soon...

[JDwhiteWRX]

Mine is at 2780lbs with 1/3 tank. You guys have got to get more serious



That's light weight glass too.

[yebokmj]

Comparing a STI weight to a WRX weight is not comparing the same vehicle, The 6speed and the rear diff right off the bat are significantly heavier than that of a WRX.

[tuzzio]

Don't forget the longer axles, and that stupid wing.