Official 135i Weight Loss Thread/ Lightest 135i List

[Focusedintntions]

Originally Posted by octironSmith

So do we think this is worth the loss of comfort? Thoughts?


Wasn't this with complete CF body panel replacement?

yes and with no interior or carpeting or anything else in teh car....pure race car.

[The1]

Originally Posted by octironSmith

So do we think this is worth the loss of comfort? Thoughts?


Wasn't this with complete CF body panel replacement?

I think 3200 would be pushing it for daily comfort.

if you did a carbon front end and carbon trunk with light weight battery and some other minor tinkering, you're probably about as far as would be considered usable.

once you start driving around without a back seat and trunk lining, you're entering a different level of discomfort.

I would be willing to bet that 3300 is more reasonable then 3200lbs, but, everyone has a different opinion of what is tollerable, it's up to you to decide.

I had a car that I drove for about a year that was pretty much stripped out, was one of the most fun times of my life, unless I was on a road trip, and I never missed music so much (and the car had a stereo, it was just not that audible over the noises of the car)

It's a fine line, but it's up to you.

I would keep it simple, carbon hood and trunk, light weight wheels, and maybe sun roof. Take the back seat out for track days. and maybe scrap the plastic under the hood, it's very unnecessary. Going light weight battery does sit on the fence in my opinion. I love the idea but I know the battery is in the back for weight distribution purposes, and putting a light weight one in there when you have a massive front mount intercooler is going to move the bias to the front. This is why I've left my battery stock.

I'm willing to bet this would put the car at the 3300lbs and maybe a touch lighter mark

100lbs off a car is very noticeable to me. So, really depends how greedy for light weight you get


That 2500lbs car isn't usable on the street anymore. It may still be licensed, but there would be nothing legal about it.

[pixelblue]

Originally Posted by The1

I would keep it simple, carbon hood and trunk, light weight wheels, and maybe sun roof.

not sure if I am missing something but how is that simple?

3300 is no loss in comfort. 3200 you're looking in more road noise, so forth and so on...

[The1]

lol, that's why the "maybe" I tend to make simple things complicated....

[bogart]

3,300 is easy and comfortable. The car is just as comfortable as it was stock. It depends what your definition of comfort is.

3,200 is easy as well. I used to run without the backseat, floor mats, and a stripped trunk. The biggest differences were road/exhaust noise, especially with the Cf trunk with no lining, and buffering when the windows are rolled down, wind getting caught against inside of trunk. Simple solution was to open more than one window or the sunroof as well. And yes, 100 lbs makes a huge difference.

The 2,500 was completely stripped. I think the FE was CF
Obv the trunk and hood as well. Race seats. Etc. It would be easy to achieve, but many "creature comforts" would be lost. It could be a daily driver if you're okay with that sort of thing.

[Xearo]

I know this is an old thread but just FYI the mid section exhaust for an N54 weighs 29lbs And the rear muffler section weighs 28lbs. I can weigh the factory downpipes as well if anyone would like.

[DRedman45]

^good thread to bump

I find it odd that nobody has chimed in on the greater effects of getting rid of rotating mass vs deadweight...I am not so technical on the engineering/physics of it, but reducing rotating weight has a much greater impact on the power being put to the ground...10lb/corner lighter wheels and tires will give you better performance than losing 60lbs of deadweight

[stormzusmc]

Again old thread bump, there may be a new one, but this should get cleaned up/updated, and made into a sticky!

[MuNkY6913]

Combined OEM clutch plate, clutch disk and dual mass flywheel is 42.2 lbs including the bolts holding the clutch to the flywheel and the stock spindle in the flywheel. It's substantially heavier than the Spec stage 2+ Steele single mass flywheel and clutch disk and clutch plate. I'm sure you can get the exact weights from Spec. No way I'm taking it off the car to weight it. Haha. But picking the spec flywheel up after taking the stock one off I remembered saying holy crap this thing is light.

[inline sex]

a year old bump

My 135i M/T weighed in at 3380 3/4 tank and driver[145#]

No real weight reduction besides bmw PE and DCI
Also has power seats, navi and convenience

Since then I got catless DP and real tires so I should be right around 3300lbs

[heeblet]

Thnx for the bump I read the whole thing. Very good thread.

[hokejka]

any updates? i know a lot of you guys are running some empty cars

[lowbudgethero]

Any weight savings from exhaust I did was added with bigger front wheels/tires and the 335is/550i clutch and pp. I didn't think to weigh them both but the PP seemed heavier than the factory one by a few lbs.

[Ginger_Extract]

2010 135i Coupe, 6MT
- US Spec (sun roof)
- No options (no nav, manual, non heated seats, etc.)

Race weight: 3409lbs.
- 3/4 tank of fuel
- Me in car (185#)

3409 - 185 = 3224

Weight considerations
- Cowl delete
- N55 MP/BERK Race
- 17" track set up 255/40 square
- TC Kline coilovers (about the same as stock)
- Eibach front sway bar (heavy)

Pretty sure there's at least another 50# that can be easily removed via battery and seats.

[ShocknAwe]

Originally Posted by Ginger_Extract

2010 135i Coupe, 6MT
- US Spec (sun roof)
- No options (no nav, manual, non heated seats, etc.)

Race weight: 3409lbs.
- 3/4 tank of fuel
- Me in car (185#)

3409 - 185 = 3224

Weight considerations
- Cowl delete
- N55 MP/BERK Race
- 17" track set up 255/40 square
- TC Kline coilovers (about the same as stock)
- Eibach front sway bar (heavy)

Pretty sure there's at least another 50# that can be easily removed via battery and seats.

Front race seats, rear seat delete and a braille battery and you'd be sitting pretty ~ 3250 or so race weight.

[feeshta]

Zombie thread alert!

I was searching for something else and came upon this thread. I read through it with interest as to whether anyone would mention the best mod I have ever made to any car I have owned, which happens to have a weight savings benefit. Sadly, nobody had.

Get rid of that evil squeaking bastard of a center arm rest. It's worth 10 lbs easy, as the thing is surprisingly heavy, and worth infinitely more as a measure of addition by subtraction. No more bashing your elbow on it every time you shift into second. No more incessant squeaking making you want to burn your car to the ground on every long trip. Just get the trim piece that covers the hole and the fitting piece that holds things together. I think they cost about $25 for both, and enjoy a life free from the worst flaw of the E82.

It's completely liberating.

[dbronnik]

Zombie thread alert #2

22lb cast-iron counterweight can be removed in rear crash bar! credit to hydra from n54tech (#4 here: http://www.realoem.com/bmw/enUS/show...diagId=51_5403)

[Newguy123]

Originally Posted by dbronnik

Zombie thread alert #2

22lb cast-iron counterweight can be removed in rear crash bar! credit to hydra from n54tech (#4 here: http://www.realoem.com/bmw/enUS/show...diagId=51_5403)

Good call! Will be doing this soon, I also have invested in some "unsprung" or "rotational" weight savings as of late.

Kosei k1 wheels 17x8.5 ET40 square 16.xx lbs per corner

*This saves 8 lbs per corner in the front and 10 lbs per corner in the rear over stock 264 wheels so a total of about 36lbs this doesn't include going to a non run flat R compound tire.

Racing brake 2 piece light weight Oem replacement rotors/pads for front and rear. this shaves a total of 22lbs of rotational weight if you do all 4 corners. 12lbs front savings and 10lbs rear.

M4 dct flywheel went in that saves about 10lbs of rotational weight over the stock weighted unit (and most importantly fixed the misfires i was seeing when running 475+ wheel horsepower)

I read pretty deep into rotational weight savings and found a general consensus among a few different articles of "for every ~10lbs of rotational weight removed it's equal to removing about ~26lbs static weight"

The only other weight removal I do for race day is remove the axle back muffler and run a straight pipe not exactly sure on the savings but it's at least 30lbs

Pull the passenger seat and rear seats. The rear I believe are good for 55lbs and not sure what the motorized heated front seat weighs but I think it's around 65-70lbs.

[Newguy123]

Originally Posted by dbronnik

Zombie thread alert #2

22lb cast-iron counterweight can be removed in rear crash bar! credit to hydra from n54tech (#4 here: http://www.realoem.com/bmw/enUS/show...diagId=51_5403)

I pulled the rear bumper cover and the rear bumper itself to find no hidden or built in weight. My car is a 2012, my buddy checked his 08 with the same result... Nothing there

[dbronnik]

Originally Posted by Newguy123

I pulled the rear bumper cover and the rear bumper itself to find no hidden or built in weight. My car is a 2012, my buddy checked his 08 with the same result... Nothing there

Sorry about the wasted time! I did just read in this thread that some other people were also not able to find the rear crash bar. Perhaps this is only found on convertibles: http://www.1addicts.com/forums/showthread.php?t=213443

[TZANIDO777]

Got mine down to 2678 without driver and this is with a half cage. No carbon fiber panels.

[Newguy123]

Originally Posted by TZANIDO777

Got mine down to 2678 without driver and this is with a half cage. No carbon fiber panels.

Wow!! let's see some pics! That thing must fly