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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, May-14-2019, 12:57:18 AM   #1
Whitehawk8
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Default OEM Rotors or CSL?

Trying to decide which rotors I should choose and thought you guys know best. Keep in mind price is no issue because of FCP warranty. Also keep in mind that these are my ONLY 2 choices. My car is a daily driver that sees between 5-10 track days a year.

OEM Rotor (Blank)
Pros:
-Not prone to cracking
-Lower Heat Cycling Spikes because of increased Mass

Cons:
-No BBK upgrade
-No Where for pad buildup to go?

CSL Rotor
Pros:
-996 BBK upgrade available
-Holes for Pad buildup to escape?
-Looks freakin awesome
-More "edges" leading to better braking?

Cons:
-more prone to cracking

As of now Im more leaning to the CSL rotor because im thinking of a future 996 BBK. Somebody help me make the right choice. Thank you!
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Last edited by Whitehawk8; Tue, May-14-2019 at 01:05:21 AM.
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Old Tue, May-14-2019, 01:08:06 AM   #2
TboneM3
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Default Re: OEM Rotors or CSL?

I would get euro 325mm. For weight savings and slight bling. If no plans on 996 brembo conversion.
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Evolve-R Alpha N Evolve CSL CF Airbox Eventuri Scoop Supersprint V1 stepped 2.5" SS V1 S pipes 2.5" + 200 cell HFC OE sect 2 SCZA 2.5" sect 3 Besian RE pullies fan/SAP/washer/fog delete CSL battery

Bilstein HD B6 + GroundControl/Eibach 325/550lb + GC "tall" RSMs Hotchkis front sway (med) rear strut bar TMS camber & subframe plates Eibach alu rear camber arms RE trans mounts AKG poly subf/diff 95a SDW RTAB OE weighted ///M knob + ZHP alcantara boot + UUC DSSR + delrin bushing

OE CSL trunk Cobra Nogaros + BK + manual OE bases TMS black pedals Sportline 8S 18"x 8.5/9.5" MPSS 245/275 APEX 75mm Studs Brembo 996 4 pot 36/40 345mm CSL & 28/30 328mm CSL ZHP "712" rack Pioneer/CDT/Eclipse/Kicker
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Old Tue, May-14-2019, 01:10:55 AM   #3
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Default Re: OEM Rotors or CSL?

Quote:
Originally Posted by TboneM3 View Post
I would get euro 325mm. For weight savings and slight bling. If no plans on 996 brembo conversion.
Question. Why those instead of CSL?

Correct me if im wrong but euro rotors are US size but drilled?
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Old Tue, May-14-2019, 01:11:52 AM   #4
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Default Re: OEM Rotors or CSL?

1. OE blanks.

2. BBK gains you nothing.

3. Pad buildup?
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Old Tue, May-14-2019, 01:11:55 AM   #5
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Default Re: OEM Rotors or CSL?

Quote:
Originally Posted by Whitehawk8 View Post
Question. Why those instead of CSL?



Correct me if im wrong but euro rotors are US size but drilled?


Their semi floating like the csl
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Old Tue, May-14-2019, 01:13:38 AM   #6
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Default Re: OEM Rotors or CSL?

Iím going with the stock 325 rotors and will upgrade to the euro 325. With the db9 vagbratechnic kit you have both 325 and 345 options
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Old Tue, May-14-2019, 01:23:29 AM   #7
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Default Re: OEM Rotors or CSL?

Quote:
Originally Posted by lmtfi View Post
1. OE blanks.

2. BBK gains you nothing.

3. Pad buildup?
What do you mean BBK gains nothing? Much harder to overheat those brakes when they're bigger!

Heres an article on pad buildup https://www.zeckhausen.com/catalog/i...Path=6446_6444

I put a question mark because I was unsure if the holes would help with this issue. Its one that I have on track
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Old Tue, May-14-2019, 01:38:35 AM   #8
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Default Re: OEM Rotors or CSL?

Quote:
Originally Posted by Whitehawk8 View Post
What do you mean BBK gains nothing? Much harder to overheat those brakes when they're bigger!

Heres an article on pad buildup https://www.zeckhausen.com/catalog/i...Path=6446_6444

I put a question mark because I was unsure if the holes would help with this issue. Its one that I have on track
Drilled rotors heat stress much easier from track use. If you are beating on rotors as hard as you suggest from your comment - then you are clearly increasing your chance of a rotor crack ending your HPDE weekend.

If you need better rotors due to extreme use (I assume you are running sessions substantially longer than the typical 25-30 minute sessions) - go with PFC Direct Drives.

Standard brake cooling practice at the track will avoid imprinting.
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Old Tue, May-14-2019, 01:55:25 AM   #9
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Default Re: OEM Rotors or CSL?

If you’re going the FCP Euro route there are no real cons to the CSL rotors. I have a similar plan to run the CSL rotors, then possibly upgrade to the 996 brakes.

The two benefits you didn’t mention are that the floating rotors have better heat dissipation, and the rears will reduce unsprung weight 2 lbs per corner. Some say the floating rotors also reduce pad and bearing wear.
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Old Tue, May-14-2019, 02:02:54 AM   #10
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Default Re: OEM Rotors or CSL?

Quote:
Originally Posted by lmtfi View Post
Drilled rotors heat stress much easier from track use. If you are beating on rotors as hard as you suggest from your comment - then you are clearly increasing your chance of a rotor crack ending your HPDE weekend.

If you need better rotors due to extreme use (I assume you are running sessions substantially longer than the typical 25-30 minute sessions) - go with PFC Direct Drives.

Standard brake cooling practice at the track will avoid imprinting.
my track sessions don't usually go on longer than 30 minutes but yes sometimes they do

Do you think that a 30 minute session will be too hard on a CSL rotor?
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Discussing OEM Rotors or CSL? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)