[randomquickness]

I borrowed this from another forum I frequent because 1addicts needs a thread with all the weight loss stuff consolidated.

Want to trim some weight off of your 135i? You aren't alone. This thread is for detailed inputs on weight reduction for the 135i. Please no guesstimates or they wont be added to the list.

WHY IS WEIGHT LOSS IMPORTANT?!?!?!?!?!?!
Ive been wondering how weight loss translates in terms of hp so I did some rough calculations that might be interesting to you all. If you assume a 3500 lb car with 500 hp, each 100 lbs of weight loss translates to this amount of power. Math experts please correct me if I'm wrong.

Weight....actual HP.........lbs/hp.............relative power
3500.......500.................7.0................ .500
3400.......500.................6.8................ .514.7
3300.......500.................6.6................ .530.3
3200.......500.................6.4................ .546.9
3100.......500.................6.2................ .564.5
3000.......500.................6.0................ .583.3

So a 300lb weight loss is the equivalent of adding 47 hp if my calculations are correct. Interesting to note that going from 3500 to 3400 is only equivalent to 14.7 hp and going from 3100 to 3000 is equivalent to gaining 18.8 hp.

Requirements for being included in the weight loss thread. #1 Replacement Part #2 Brand of said part i.e. Recaro seats, Brembo BBK #3 Actual weight difference between both parts, weight lost by installing new part or the weight of the new part itself.

This method will allow us to eliminate some of the guess work for those of us trying to trim some weight.

135i curb weight is ~3252lbs depending on options

Battery: Stock - 53 lbs
Braille B3121 - 21 lbs
Odyssey PC680 - 14.99 lbs
Odyssey PC925 - 26.0 lbs
Odyssey PC1200 - 38.2 lbs
Optima Red Top battery - 39.4 lbs

Brakes:
-OEM front kit -
-OEM front rotors -
-OEM front calipers -
-OEM rear kit -
-OEM rear rotors -
-OEM rear calipers -

Suspension:
OEM front springs/shocks
OEM rear springs/shocks
KW v1 coilovers -

Seats:
-Front Sport Seats (non power) - 54 lbs EACH
-Rear Seat Removal including rear floor mats - 55 lbs
-Recaro pole position - 15.4 lbs
-Recaro Profi SPG - 14.3 lbs

Clutch/Flywheel Items:
-Stock clutch -
-Stock flywheel -

Under Hood:
-various assorted parts #1 collectively 10.2 lbs (see post 38 for pic)
-OEM air box with filter -

Exhaust Items:
-Stock down pipe(s):
-Stock mid pipe:
-Stock axle back:

Other Interior:
-window glass, motors, regulators/window cable rails and sound deadening - 28 lbs
-Subwoofers Removal -
-AC condensers, compresser -
-Door Speakers -
-Dash/Rear Speakers -
-Sunroof -
-All interior Carpet and Seatbelts -
-Passenger front air bag removal -
-Side Air Bags -

Body Parts:

-CF Roof (no interior) - (stock w/ sunroof ~? lbs with interior)
-FRP Roof (no interior) -
-Stock Hood - 44 lbs
-iCarbon single sided CF hood - 21 lbs
-iCarbon double sided cf hood - 16 lbs
-Stock trunk - 33 lbs
-iCarbon single sided CF trunk - 13 lbs
-iCarbon double sided CF trunk - 9.7 lbs
-OEM front Bumper/fenders/sideskirts - 49 lbs
-Evolution Racewerks front end widebody kit FRP - 32 lbs
-Evolution Racewerks front end widebody kit wet CF - 24 lbs
-Evolution Racewerks front end widebody kit dry CF - 17 lbs

Wheels:
OEM 264's front - 24.25 lbs
OEM 264's rear - 26.27 lbs
OEM 261's front - 26.01 lbs
OEM 261's rear - 24.75 lbs
OEM 291's front - 26.41 lbs
OEM 291's rear - 26.3 lbs
Apex Arc-8 18x8.5 - 18.45 lbs
Apex Arc-8 18x9.5 - 18.2 lbs

Tires:
OEM runflat fronts - 24 lbs
OEM runflat rears - 26 lbs

List of lightest 135i's:
1.
2.
3.

Disclaimer: every part on your car is there for a reason. Remove or replace parts at YOUR OWN RISK!

Please help me get this thread filled out as much as possible, I will do some searching but any help will be much appreciated. Thanks!