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Discussion Starter · #1 · (Edited)
Starting as a thought based on a comment in another thread.

What may be removed from the car and/or replaced without compromising safety, comfort, or drivability? Ok, maybe we can reduce comfort a little, but you get the idea. Free weight loss is best. If you are going to post CF hood and trunk, please have the before and after weights. We all know a CF trunk or hood may shed weight (yes...may...and may not). We need readily available parts for R&R or actual parts folks have removed for weight reduction.

Open to all suggestions and I will update this first post with all relative data. Please post accurate information. Pics are great too. I will hyperlink to this post as needed.


Wheels:
Factory 19x9 ~ 30#
Factory 19x9.5 ~31#
VF Forged 19x9 20#
Nismo 19x9.5 +40 20# (2015+)
Gonna stop here because there are tons of wheels out there that are lighter than factory.


Tires:
Runflat Dunlop 245/40/19 ~30#
Runflat Dunlop 265/35/19 ~ 31#


Rotors:
Factory Sport F/R ~ 30#/20# (29lb 5 oz for front)
Z1 2 piece F/R ~ 20#/15# (19lb 7 oz for front)
DBA 2 piece F ~ 24#

Non Sport F/R ~ ??#/??#


Driveshaft:
Factory RWD ~ ??#
AMS CF RWD ` ??#

Factory AWD ~ ??#
AMS CF AWD ~ 21.5#
AMS AL AWD ~ 23.05#
Different numbers from forum member:
* OEM Driveshaft AWD 23.3lbs (v)
- AMS aluminum Driveshaft AWD 23.8lbs (v) (r)
- AMS carbon Fiber Driveshaft AWD 22.3lbs (v) (r)


Exhaust:
Factory
Y-pipe ~ 9.1#
Mid-pipe ~17.2#
Axle-Back ~ 28.7#
Complete factory cat-back ~ 55# (no hardware)
Lower Down Pipes (plural) ~ 18.6#
Complete DP ~ ??#

GTHaus GT catback
Y-pipe ~ 9.9#
Mid-pipe ~ 15.8#
Axle-Back (including tips) ~ 25.7#
Complete GTHaus cat-back ~ 51.4# (no hardware)


Battery:
Factory ~ 36.9#
Braille ~10.2#
i34CX - Intensity Carbon Group 34


Undertray:
Factory Plastic ~ 2.6#
TBW Aluminum ~ 6.6#


Trunk Area:
- Trunk mat/floor board ~ 3lb 15 oz
- Tool tray and lug wrench ~ 1lb 10.4 oz


Lug Nuts:
- OEM 20 ~ 3lb 8.8 oz

GSP lightweight (20) ~ 1lb 5.2oz


Free bits:
Posted by Potatohead posts 61/62
- Carpeted OEM floor mats (4): 4lb 3.2oz
- Owner's manual and related booklets (assuming you normally keep it in your glove box): 2lb 3.6oz
- All 5 headrests: 7lb 0.0oz
- If you want to leave at least your driver side headrest in place (probably recommended): + 1lb 14.0oz
Thus, 4 headrests: 5lb 2.0oz
- Also, worth noting, gasoline weighs about 6lb/gal. That can really add up when comparing a full tank of gas to, say 1/8 or 1/4. I think our tank holds 20 gal? So 1/4 tank = 30lb, full tank = 120lb
- Also keep in mind water weighs a little over 8lb/gal. I don't know the capacity of our windshield washer tanks but if it were, say, a gallon, you could save ~8lb by running with the fluid on the low end.
- Rear passenger side tow hook. 2lb 9.8oz. (Advising against this, but this is ptatohed posting)
 

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Discussion Starter · #3 ·
Organized first post a bit more.

I need folks to confirm/deny these numbers. Anything with a ??# means, of course, that I don't know the weight. If you know for sure, please help.
 
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Discussion Starter · #5 · (Edited)
By the way, are you saying the FI downpipe and complete exhaust saved only 6#? It should be a lot more than that.

EDIT: This the only bit of information I found at the FI homepage. They listed the LDP and cat-back as saving 9# over factory and that the LDP was 7# lighter. This translates to the cat-back being only 2# lighter which seems wrong somehow. Need to do some digging with FI.
 

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Discussion Starter · #9 ·
Hi All! I just got a 2017 Q50 RS400 today :) I am looking to reduce weight, but haven't done anything yet obviously. I heard the OEM Run Flats aren't the best for performance, even all-season. Anyway, listed weights of a popular all-season tire to save about 20# overall:

Continental ExtremeContact DWS 06
245/40ZR19 ~24#
265/35ZR19 ~25#

I would be interested in an exhaust system to lose weight, but don't want to sacrifice too much fuel mileage... yeah I commute mostly. Does anyone have any info on their weight savings for exhaust replacement and the change in their fuel economy?

Thank you all!
the only reason you would see a loss in mpg is that lead appendage called a right foot.

i do 18.1 combined and Ibhave zero power mods so good luck.

as far a sexhausts. gthaus claims a 30# loss for a catback. and maybe 60# for titanium catback. i have the numbers written down but didnt put in 1st post.
 

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Discussion Starter · #28 ·
Updated first post.

Managed to get the following information:
AMS CF AWD ~ 21.5#
AMS AL AWD ~ 23.05#

Now, I just have to weigh my factory driveshaft and post it.

C'mon guys...get me some weights!!!
 
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Discussion Starter · #32 ·
As wheels are always a good candidate for weight-reduction, Z1 Motorsports has NISMO Rays on pre-order for those of us who plan to complete some HPDEs:

https://www.z1motorsports.com/rays/nismo/nismo-57cr-clubsport-spec-wheels-single-pre-order-p-15189.html?osCsid=e5mro25a1lpb6pt6jo8kp1m4q5



I'd likely opt for the 19x9.5" (FR) and 19.10.5" (RR).

As for weight, the 19x9.5" is 20.3 lbs.

https://www.flickr.com/photos/jdmwheel/6947603691/in/album-72157629263406585/

the 19x10.5" is 21.1 lbs:

https://www.flickr.com/photos/jdmwheel/6836473150/in/album-72157629263406585/
19x9.5 +35 is the most offset you can get. not enough for awd guys running square setup. may be ok for rwd as those will only go up front.

i will update first post with VG forged
 

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Discussion Starter · #36 ·
iI would say +40 for a 275
+38 may fit a 265
+35 ones at z1 may fit 255...265 may get too close.

maybe i am being a little too careful, but my +40 275 is very very close in the rear. I have a youtube video on it.

I am going to try and put the wheel tire weight information in the official wheel thread. I will ask folks to add that information to their posts that I have hyperlinked.

the first post is going to get jumbled up.
 

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Discussion Starter · #38 ·
That is odd...maybe they gave me the shipping weight.

There is no way in heck that the factory driveshaft would weight the same as the aluminum one...or is there?

Now, I have to make sure I weigh mine. I still have the AMS box...I will weigh them together. If I don't post by Sunday, someone please remind me.
 

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Discussion Starter · #40 ·

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Discussion Starter · #45 ·
Yup, I was considering a Lithium battery's when I had to swap my G37's out this winter. Was shocked to see the price, that said
I know they have insane margins and you can buy similar battery's from China that are half the price.


@jodedor - Have you looked into relocation the battery to the trunk instead? If your going to drop $1500
in the name of weight savings swapping out the front seats for a lightweight bucket seat would give far better
weight savings for similar money.
I get it. There are other ways.

I don't want to relocate the battery because that would be a bunch of added copper weight and a proper bracket to hold it in place. Not to mention losing some trunk space. I did that with a surge tank in a sealed box in my WRX. I don't want to go through that again.

Don't want $750 (each) race seats for $1500 as I would lose all my power whatever and airbags. And, all the hardware of light weight seats adds up too. Sure, it may end up being 30 to 35 pounds versus 50 pounds. But, it will no longer match the Red Sport theme.

Believe me. When I first got the car, I wanted to swap out the seats for the GTR Nismo ones. When I found out it would be around $15 a piece, I looked at the Recaro CF ones and those are $7 a piece. Sparco makes them for $3 a piece.

Who knows...at the end of the day, if the build gets dumb enough, I wouldn't count out the Recaro CF ones even though I lose the power and heating.

Baby steps.
 

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Discussion Starter · #50 ·
I ran a Braille in my Legacy a few years back. 425 CCA.

The Lithium battery I am getting has something like 900 CCA.
 

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Discussion Starter · #58 ·
First post updated with some numbers.

Yesterday, I had the Braille battery, TBW Undertray and GTHaus Exhaust (cat-back) installed.

Battery weight savings ~ 26.7#
Undertray gain ~ 4#
Exhaust savings ~ 3.6# (not including hardware). We can add a tiny bit to the exhaust because there is just a little more hardware for the GTHaus Exhaust. The tips are not welded on like the factory system and there is at least 1 slip joint. I don't know the difference in weight for the hardware, sorry.

In all, it looks like I saved around 25# overall while gaining 13whp/11wtq, some protection from underneath, and a ton of cranking power. That battery is pretty powerful.
 
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Discussion Starter · #60 ·
it has been on scales at least three times, but it wasnt controlled (gas, washer fluid, junk in the trunk), so I will not have an accurate measurement.

So far, it is at a decent 95# loss. That may be the limit unltil, and this is a big MAYBE, downpipes and aftermarket seats, but doubtful.

I will live with 95#.
 

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Discussion Starter · #70 ·
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