Has anyone here actually weighed their vehicle?

[bmw m3 s50]

I also sell CF cabin filter housings 7.5lbs lighter

And I am working on a lighyweight shock mounts alternative for our CSL bumper with aluminum rebar version. Total assembly will be lighter than the kevlar rebar option

I am definitely going to be contacting you about that CF cabin filter housings and rear carbon shelf. Both of those interest me. Just need to gather the funds, LOL.

Will the lightweight shock mounts alternative, work with the stock bumper? I am not a fan of the CSL front bumper.

[bmw m3 s50]

Since we're on the topic of composites, we shouldn't forget that Karb makes some CF body panels. $10k for ~11kg(24lb) shaving🤪

Yeah, I know about that but cost for the carbon quarter panels do not make it feasible. I unfortunately do not have unlimited funds.

Additionally not a fan of CF quarters as carbon will shatter rather than deform and costs of repair should something happen.

[bmw m3 s50]

$11k for an aluminum block. 40-50lbs off the front axle

Same as above, I unfortunately do not have unlimited fund to drop $11k for an aluminum block.

Honestly, if that aluminum block was closer to $5k, I would actually consider it.

[bmw m3 s50]

100% this. Consider weight every time you do something to the car. Everything matters.

Agreed, with this car I plan on using this mindset.

[bmw m3 s50]

simple way to lose weight. Don't be in the car =P

LOL, sure we will have develop a drone mode so the car could be driven but to defeat the fun factor of the car.

[Gt4]

I am definitely going to be contacting you about that CF cabin filter housings and rear carbon shelf. Both of those interest me. Just need to gather the funds, LOL.

Will the lightweight shock mounts alternative, work with the stock bumper? I am not a fan of the CSL front bumper.

Would work with stock alu rebar. But the alu rebar itself is super heavy. Our CSL bumper has CF rebar integrated to bumper.

I also prefer the look of non CSL bumper, trunk, diffuser honestly cause look like a better evolution of the E36 but doing the CSL theme on my LSB to make it different vs my Estoril M3. But I am working also working on a wider front end (bumper and front fenders) that will look similar to this:

[bigjae46]

Yeah, I am coming to that realization as well. This will not be a full blown race car and will be driven on the street so it's walking a fine line between tolerating a combination of noise, rattles, and discomfort and weight savings. I have not pulled the stereo nor plan on it. I will want to listen to music while driving. Also windows and door locks are staying.

So, it will depend on the change. I am willing to sacrifice some but not everything.

That sounds weak...lol Making the car track only makes weight loss decisions easy but quite difficult for a street car especially if it can't be undone.

The carbon cabin filter housing would be a good weight loss opportunity. You could remove all of the rear speakers and use a nice neo mag midbass in the front doors which doesn't cost a lot and will cut some weight.

The one good thing about carbon panels - no door dings!

[Gt4]

I did read that and am getting ideas from it. Thank you for posting it.

Sound deadnening is like 30lbs, I prefer to remove it and keep more interior parts instead

Complete audio with wiring harness can be removed and just get a Bluetooth speakers and put it on passanger seat for longer ride!

Door airbags can be removed and coded like CSL.

You can drill holes into trunk hinges, cut some sheet metal and drill holes into dash bar. On the lower steering wheel cover, you can drill plastic rivets and remove the foam and metal plate. Remove the foam from dash bar, remove some foam under floor carpet.

Can also use titanium hardware!

[Bry5on]

For some reason the spreadsheet is showing as a picture and not editable.

You don’t see this? Looks like at least 3 others have. Man I’ve had so much trouble attaching excel files on here for some reason.

[DJM]

Have you removed all the air bags and sound deadening sheets on the floor? I got mine down to 3050 with half tank of gas at its skinniest. This included no radio, no speakers, no front or rear carpet and a ZF 5 speed trans swap.

Please educate me on pros and cons of ZF transmission swap.

[Obioban]

Please educate me on pros and cons of ZF transmission swap.

Pros: 25 lbs lighter
cons: no 6th

people claim the 5 speed is more reliable, but I think that’s bogus-- 420g is a tank, and all the 5’s seem to develop 5th gear lean.

[Gt4]

We also plan to do those parts in CF this year to save some weight. Super easy mold so not as complex as the CSL trunk...

[Gt4]

If you only have 1min spare time for a weight removal project:

[tr3flip]

Please educate me on pros and cons of ZF transmission swap.

What Ian said. I did it mostly for weight savings as I was competing heavily in Bimmer Challenge and Global Time Attack. All the lighter, faster guys had AC delete and ZF swaps. I've since gone back to 6 speed. The ZF felt like shit even with new detents, bushings, etc.

[S54330Ci]

Pros: 25 lbs lighter
cons: no 6th

people claim the 5 speed is more reliable, but I think that’s bogus-- 420g is a tank, and all the 5’s seem to develop 5th gear lean.

You can still get parts and rebuild services for the ZF 5 speed. No parts or services are available for the Getrag 420G. I had a 420G in my s54 powered 330Ci track car until I started getting grinding while shifting from 3rd to 4th. Once I found out parts were no longer available for the 420G I pulled it and put in a ZF with rebuilt detents. For a track car the ZF is more robust (IMO) and as mentioned, it is lighter. I don't have any 5th gear lean in my ZF but I am running an IRP shifter.

There is a ZF 6 speed that was installed in the ZHP variants. Considerably more expensive on the used market, but if you want to stay with a 6 speed this is the one to get.