Aftermarket Rotors with Stock Brakes/Calipers

[MK599]

So after hitting the track, I ended up warping my rotors on completely stock setup. After researching a lot on brakes and everything, I found that the amount of tracking I do does not justify me going BBK route. Instead Im just sticking with track pads plus stock calipers/rotors. Im sure this setup will hold up, but I dont like the drilled oem rotors and I think aftermarket slotted rotors would benefit me.
Just wondering what rotors out there are sized so I can pair them up with my oem calipers. Im absolutely in love with curved slotted rotors, but the only company I know who does that is endless..

Looking for ideas and input.

Thanks

[sic]

No aftermarket rotor(same size) will hold up better against the OEM rotors.

[SlamMan]

Are you sure your rotors are warped and you don't just have some uneven pad deposits? I had some pretty bad vibrations after my first track weekend with the stock pads/rotors but it's pretty much gone after a few weeks on the street under normal braking conditions. After everything I've read, I get the impression the stock rotors will work great with some track pads for most weekend warriors.

[neoduffer]

Racing Brake just started a 2 piece rotor interest thread on their site. I know this doesn't help you right now, but their trying to gauge interest for e9x M3 rotors.

http://forums.racingbrake.com/showthread.php?t=777

[Radiation Joe]

Originally Posted by sic

No aftermarket rotor(same size) will hold up better against the OEM rotors.

I beg to differ.

http://store.bimmerworld.com/perform...tors-p608.aspx

[signes]

Agree with Joe, PF is what you want (if you actually have warped rotors.)

[xchosun1x]

Originally Posted by Radiation Joe

I beg to differ.

http://store.bimmerworld.com/perform...tors-p608.aspx

yea...i agree...no other not being stronger isn't a proper thing to say.
PFC rotors are nice rotors..but would avoid cross drilled and run slotted for track use

[Dave07997S]

Originally Posted by xchosun1x

yea...i agree...no other not being stronger isn't a proper thing to say.
PFC rotors are nice rotors..but would avoid cross drilled and run slotted for track use

They aren't cross drilled, they are dimpled.

Dave

[racer01]

The stock rotors seem great IMHO for what they are. Problem to me is the single piston caliper dictates a pad size that is barely bigger than my old e36 m3. This causes very high pad temps (not as much surface area or mass as a heat sink) and this causes some pads to deposit material unevenly on the rotor. This is what causes the judder usually associated with "warped brakes".

I'd go the other way and keep the stock rotors and fit a proper multi-piston caliper that can fit some decently sized pads. I'd love a caliper bracket that allowed fitting something like the Stoptech ST-40 or ST-60 caliper on our stock rotors.

[rzm3]

You are going to spend at least $1.5k getting aftermarket front rotors, pads, lines, fluid, and getting everything installed. If I were you I would simply get a front BBK that is designed to work with stock rear brakes. This mitigates the thermal management issues with the front brakes which does most of the braking. The stock rear brakes should work fine because Grand Am M3 race cars use them due to regulations. The Grand Am cars are 3250 lbs but they also have to endure 2 hours 30 mins of professional racing even in the hottest summer days.

Just my 2 cents.

[Simrokkzz]

Originally Posted by rldzhao

You are going to spend at least $1.5k getting aftermarket front rotors, pads, lines, fluid, and getting everything installed. If I were you I would simply get a front BBK that is designed to work with stock rear brakes. This mitigates the thermal management issues with the front brakes which does most of the braking. The stock rear brakes should work fine because Grand Am M3 race cars use them due to regulations. The Grand Am cars are 3250 lbs but they also have to endure 2 hours 30 mins of professional racing even in the hottest summer days.

Just my 2 cents.

Hey!!

I disagree that on the M3 with a good weight balance between front and rear the front does MOST off the braking, for sure it takes more "weight" in terms of percentage, but due to the fact that the car has nearly same size rotors, you can clearly see that the rear brake is used hard as well.

See Porsches, due to their rear engine, they have often same size rotors...

But for sure I agree that a bbk on front makes sense, or at least a bigger pad, to reduce thermal impact on that "small" area in terms of cm².

So a bigger pad (thus different capiler) would make sense to reduce thermal pressure and heat exposure....

this is what I experienced with my cars and racing on the Nürburgring.

[racer01]

There is no doubt the fronts do most of the work. The Stoptech white paper attached below quotes the rears typically only do 15-20% of the braking. It is not due solely to static weight distribution, but rather the fact that weight transfer under braking has the front heavily loaded. Think the extreme example of motorcycle road racing.....they have the rear wheel hovering off the ground a few inches under really heaving braking....no need for a rear brake then.
Many manufacturers use the same diameter rotors front and rear for looks....the rear calipers and pads on the M3 are much smaller, the rear rotors are not nearly as thick, and the master cylinder distributes less hydraulic pressure to the rear lines.
I hate that it would look a little weird, but for track use I personally have thought about upgrading my fronts to a BBK with solid rotors (Stoptech) and leave the rears alone with upgraded pads.

This white paper describes it much better, and with more pedigree behind the words.....

http://www.stoptech.com/tech_info/wp...upgrades.shtml

[Richbot]

The rear rotors wouldn't be nearly so big on the M3 and BMW's in general if they didn't use a drum parking brake. 911's carry more than 60% of their weight over the rear axle with a large percentage of it *behind* the rear axle. That's an apples to orangutans comparison, and the front brakes are *still* bigger on many of their setups

[m3heaven]

Originally Posted by neoduffer

Racing Brake just started a 2 piece rotor interest thread on their site. I know this doesn't help you right now, but their trying to gauge interest for e9x M3 rotors.

http://forums.racingbrake.com/showthread.php?t=777

I just replied to this thread expressing interest. Hopefully others will do the same