BMW E46 Fanatics Forum banner

1 - 15 of 15 Posts

·
Registered
Joined
·
94 Posts
Discussion Starter #1
I just wonder if they are reducing the weight...

Thanks for the info!
 

·
Registered
Joined
·
94 Posts
Discussion Starter #7
...

thanks for the replays!

Yeah I wondered if replacing the stock brakes with brembos 13" might also reduce weight a bit :)
 

·
Registered
Joined
·
2,270 Posts
Clem said:


I meant the entire front kit weighing only 10 Lbs.

I do know the 14" kit seems to weight less than the 12.6" 1-piece kit.
Sorry - misinterpreted what you said. They are about 10lbs lighter total
 

·
Registered
Joined
·
94 Posts
Discussion Starter #10
...

So swapping my stock with Brembos would reduce the weight for about 10lbs.

I assume this is unsprung weight so this owuld be equal to 70lbs of sprung weight!

A lot :p
 

·
Registered
Joined
·
1,339 Posts
What part of the kit is lighter? I'd assume the rotor is larger/thicker so it therefor heavier which because of increased rotational mass would just be like a heavy set of 19" rims... :dunno:
 

·
Registered
Joined
·
56 Posts
moment inertia

The actual weight only matters for accelerating in a straight line. The trick is, the rotors have to accelerate in a circle, too.

Mass at the center of a circle is really easy to turn. That same mass pulled away from the center is tougher to turn. To prove this, sit in your boss's office chair (this is science - he wont mind) and get yourself spinning so fast you feel like yer gonna hurl. Now, stick both your arms straight out -- you'll slow down as the energy that went into spinning fast now isnt enough anymore (your mass moved outward). Pull your arms in again if you dont believe me (your mass moves inward, and that same energy will spin you faster again)

So, by going to a heavier, LARGER rotor, you're hit four or more times.

Once for accelerating in a straight line.

Once for the extra mass to turn.

Twice or more for the increased radius - you're moving the mass outward.


BMW's brakes are great stock. Put on steel braided lines and they kick massive ass. Go to a BBK and gain nothing but mass.
 

·
Registered
Joined
·
94 Posts
Discussion Starter #13
...

@Vann thanks for the insight. Just 2 Q's:

1. BBK= Brembo ... ?
2. steel braided lines means?

Thanks

:thumbup:
 
1 - 15 of 15 Posts
Top