F8X Weights & Weight Reduction Data - Ongoing List

[Accel Junky]

Originally Posted by Cloud9blue

Not trying to be a hater... But there is almost no point doing all of these works unless you are stripping down the interior and going with a lightweight racing seats (you can probably save a 100lbs just be switching the seats alone, going with a stripped down interior would probably net another 100-300lb saving, but why are doing that to a brand new $80k M3 is the question)...

Most of the weights in any modern BMW are in the sound insulation and stock seats. And unless you racing competitivelyp, it would be just a waste of money. If you want faster times, spend the money on sticker tires and better driving skills instead.

I'm just gathering as much info as I can. I find it very fascinating to try and save weight especially for no cost (and I especially like when I replace a part, also saving weight in the process...I try to keep that in mind no matter what mod I do). What I am learning on this car though is that BMW has done a very thorough job and street-minded weight reduction will probably be pretty limited. Seats, exhaust, battery are probably the main low-hanging fruits. Battery and exhaust though will make the front bias worse.

[dmk08]

Originally Posted by Accel Junky

I'm just gathering as much info as I can. I find it very fascinating to try and save weight especially for no cost (and I especially like when I replace a part, also saving weight in the process...I try to keep that in mind no matter what mod I do). What I am learning on this car though is that BMW has done a very thorough job and street-minded weight reduction will probably be pretty limited. Seats, exhaust, battery are probably the main low-hanging fruits. Battery and exhaust though will make the front bias worse.

Plus you gotta use those scales or Mrs Accel Junky may come after ya!

[Accel Junky]

Originally Posted by dmk08

Plus you gotta use those scales or Mrs Accel Junky may come after ya!

You are so right and I got in such massive trouble for that purchase!

[robbo mcs]

Originally Posted by Cloud9blue

Not trying to be a hater... But there is almost no point doing all of these works unless you are stripping down the interior and going with a lightweight racing seats (you can probably save a 100lbs just be switching the seats alone, going with a stripped down interior would probably net another 100-300lb saving, but why are doing that to a brand new $80k M3 is the question)...

Most of the weights in any modern BMW are in the sound insulation and stock seats. And unless you racing competitivelyp, it would be just a waste of money. If you want faster times, spend the money on sticker tires and better driving skills instead.

Maybe the OP won't be completely stripping out the car, but other people will be. It is extremely useful to have this resource here.

I race in series overseas that use production cars, you are allowed to take certain things out, others have to stay. At the same time you add in weight with a cage etc. Also, the car has to comply to a minimum weight. If you are building a car for series like this it is extremely helpful to have a list of weight of all kinds of components. It may help you decide whether the car is going to work within the regulations etc.

Previously when I have built rally cars I have documented the weight of everything that comes out of the car, down to things like sun visors, small plastic trim panels, seatbelts etc etc. It provides others with a great resource

Thanks to the OP for putting this together. It is greatly appreciated

[///Mobbin]

This thread should be made into a sticky btw.

[sergkoko]

Originally Posted by ///Mobbin

This thread should be made into a sticky btw.

+1

[Accel Junky]

I've added a couple more items.

Rogue Engineering 12mm and 15mm spacers plus their extended lug bolts. These are supposed to be some of if not THE lightest choice for our vehicles. The extended lug bolts are identical in weight to the Macht Schnell versions so they are probably the same part if I had to guess. The RE spacers are 22% lighter than the Macht Schnell variety. You can clearly see why when you look at them. There are additional large lightening holes on the spacers.

[Powaup]

Front seats weight: http://f80.bimmerpost.com/forums/sho...5&postcount=20

[Accel Junky]

Originally Posted by Powaup

Front seats weight: http://f80.bimmerpost.com/forums/sho...5&postcount=20

Already got 'em.

[AsiaKid]

I know you mentioned the hood is not heavy..but i wonder how much weight savings would be to go to a full CF one..there are already some out there..i am sure some pro ones will come out when more M3/4s are produced

[Tom (Atl)]

Great thread.

So it sounds like the best route for maximum easy weight savings is:

- CF roof
- Remove back seat
- Smaller battery

Anything else that would be easy and very noticeable?

Unfortunately I feel the car needs more weight on the rear for traction purposes.

[ninekrpm]

Very informative thread....

[M4 CSL]

Great thread. I have a few items that would be a nice reduction. Interested on how much saved.

I'm concentrating on unsprung weight first.

AP Racing Pro 5000R Radi-CAL
BBS FI-R
HRE (Ticore) Titanium wheels lugs

Need to check the weight of Ohlins TTX46 & TTX36

I already have the full titanium AKRA.

Weight savings is always and interesting way of modding, that has almost hidden payoffs.

[Porsha]

This is my new favorite thread. Thank you for detailing all of this out.

[AM4ZING]

Originally Posted by Tom (Atl)

Great thread.

So it sounds like the best route for maximum easy weight savings is:

- CF roof
- Remove back seat
- Smaller battery

Anything else that would be easy and very noticeable?

Unfortunately I feel the car needs more weight on the rear for traction purposes.

Originally Posted by Powaup

Front seats weight: http://f80.bimmerpost.com/forums/sho...5&postcount=20

What is the weight of the rear seats?

[CanAutM3]

Originally Posted by AM4ZING

What is the weight of the rear seats?

IIRC, karussell weighed his M4 rear seats at ~40lb.

[AM4ZING]

Originally Posted by CanAutM3

IIRC, karussell weighed his M4 rear seats at ~40lb.

Registered my car for 1/2 mile at Shift S3ctor so trying to figure out the benefit of removing some parts

[CanAutM3]

Originally Posted by AM4ZING

Registered my car for 1/2 mile at Shift S3ctor so trying to figure out the benefit of removing some parts

Every bit counts

[Porsha]

Seems like there's a lot of weight to be had in the exhaust as well. Burger tuning posted a 43lb weight loss using their exhaust over factory.

http://f80.bimmerpost.com/forums/sho...&postcount=152

[Rx7andy]

Does somebody have weight info for the stock under seat woofers (2?)and amp? Seems like a good opportunity to change to single woofer and move everything to the trunk to reduce weight and shift weight to the rear.

[shahano]

great thread.

[tom @ eas]

Following up with OEM Brake Component weights (non-CCB).

OEM Calipers
Front Caliper- 10.65lbs ea.
Rear Caliper - 8lbs ea.

OEM Rotors
Front Rotor - 24.4 lbs ea.
Rear Rotor - 20.4 lbs ea.

Originally Posted by Rx7andy

Does somebody have weight info for the stock under seat woofers (2?)and amp? Seems like a good opportunity to change to single woofer and move everything to the trunk to reduce weight and shift weight to the rear.

OEM underseat subs are 1.65lb ea.