Track forum general chit chat.

admranger · 04-26-2021, 09:23 PM

Quote:

Originally Posted by VicS5

A flat spot on a tire can be subtle to the eye, but dramatic on the road.

Something internal to the tire structure could have been damaged as well.

Did you spin all the wheels to check for any bending? I imagine you did, but just asking. Can you swap a different set of wheels on the car and see if the issue is still there?

roastbeef · 04-26-2021, 09:50 PM

Quote:

Originally Posted by Bimmer Barney

Thump Thump Thump

After my last track day, I had a thump thump thump that I assumed was just a big chunk of track rubber on the tire. It's there at all speeds and rate of thump matches speed of car. Seemed normal to me, and figure after some street miles the tires would self clean like usual. Well, 500 miles later and it's still happening so I jacked up the car to feel the tire surface and I don't see or feel any rubber slag, chunking, or anything. Upon initial inspection the tread looks totally normal.

No other unusual driving behavior (from the car at least!).

I did have a spin and 2 offs at the track day (&#128556

, but didn't hit anything (not even a curb, or one of those cinder blocks) and didn't have any visible damage. I've removed all wheels as part of my post track day cleanup/check up and no visual bends or cracks to wheels (Apex EC-7). Track pads have been swapped all around back to street pads, and components cleaned and inspected at that time.

No play in wheel bearings, no whirring noise, no squeal.

Ideas on where to check next?

could have knocked some wheel weights off.

atopa2002 · 04-27-2021, 08:30 AM

Guys is this crack a concern or not , pfc rotor I bought used
Measures 31.5 , new is 32

Thanks

fsmtnbiker · 04-27-2021, 08:33 AM

Not a concern.

dparm · 04-27-2021, 08:50 AM

Quote:

Originally Posted by atopa2002

Guys is this crack a concern or not , pfc rotor I bought used
Measures 31.5 , new is 32

Thanks

Send it.

Unless you can catch your fingernail on it, no, it looks fine. IME you will not hit minimum thickness on these big BBKs, you will end up getting excessive cracking that causes a replacement.

Redd · 04-27-2021, 08:50 AM

Quote:

Originally Posted by atopa2002

Guys is this crack a concern or not , pfc rotor I bought used
Measures 31.5 , new is 32

Thanks

Surface cracks like these are common if they have been used on track. Not a concern until they reach the edge.

Richbot · 04-27-2021, 09:51 AM

Quote:

Originally Posted by admranger

Something internal to the tire structure could have been damaged as well.

Did you spin all the wheels to check for any bending? I imagine you did, but just asking. Can you swap a different set of wheels on the car and see if the issue is still there?

What he said - a broken belt can cause womp womps without any obvious wear/bulges etc. at first

Ximian · 04-27-2021, 10:34 AM

Quote:

Originally Posted by Ximian

The E92 was officially kicked out of the garage and is now on the driveway...

Any other effective tricks on finding small leaks?

It was that valve stem cap. Apparently just that one was defective enough when it was placed on securely, it caused a slight leak.

SYT_Shadow · 04-27-2021, 02:22 PM

Quote:

Originally Posted by atopa2002

Guys is this crack a concern or not , pfc rotor I bought used
Measures 31.5 , new is 32

Thanks

Definitely not. The cracks get a lot bigger before you have to stop using them.

StripclubDJ · 04-27-2021, 09:54 PM

Quote:

Originally Posted by atopa2002

Guys is this crack a concern or not , pfc rotor I bought used
Measures 31.5 , new is 32

Thanks

That's a brand new rotor to
Me lol

kayha12 · 04-27-2021, 09:59 PM

My stoptech rotors have looked like that after 1 event, been running them for 3 seasons now hahah

redpriest · 04-27-2021, 11:43 PM

This is a 26 track day rotor with a crack on the edge - I retired them after I saw this.

roastbeef · 04-27-2021, 11:45 PM

It's not cracked until you can see daylight through it.

Ximian · 04-28-2021, 08:41 AM

Cracked rotors are like toilet paper, you can use both sides until they're done.

PrimeBMW · 04-28-2021, 09:05 AM

Quote:

Originally Posted by Ximian

Cracked rotors are like toilet paper, you can use both sides until they're done.

Remind me never to shake your hand

sbo76 · 04-28-2021, 11:37 AM

Quote:

Originally Posted by redpriest

This is a 26 track day rotor with a crack on the edge - I retired them after I saw this.

wow - i thought i pushed rotors.

dparm · 04-28-2021, 12:22 PM

It depends on how hard you drive the car, tires, cooling, pad choice, rotor size, etc. I could get 26 days if I just do one session a day...

Bartledoo · 04-28-2021, 12:34 PM

Quote:

Originally Posted by dparm

It depends on how hard you drive the car, tires, cooling, pad choice, rotor size, etc. I could get 26 days if I just do one session a day...

Don’t forget how hard you work stability control lol.

redpriest · 04-28-2021, 01:47 PM

Quote:

Originally Posted by dparm

It depends on how hard you drive the car, tires, cooling, pad choice, rotor size, etc. I could get 26 days if I just do one session a day...

Have you seen how I drive?

LoL. I paid for the track time, I'm going to use it. During some private track days, I've done sessions where I go out with a full tank of gas and came back empty - 40 min of driving. That's where I learned the Nankang AR-1s can take it as long as you have the tires dialed in right at the start.

redpriest · 04-28-2021, 01:49 PM

I'll add that Brembo's Type 3 rotor survives only 6 or 7 days in my hands on my E46, same with stoptech rotor. This is why I like the AP kit so much - I regularly get 20+ days on a single rotor. The rear rotors on my E92 have 80 days on them.

jid2 · 04-28-2021, 03:44 PM

Well guys I sold my car, now I'll just be around to troll Mr. Roastbeef...

dparm · 04-28-2021, 03:46 PM

Quote:

Originally Posted by jid2

Well guys I sold my car, now I'll just be around to troll Mr. Roastbeef...

What replaced it?

I don't discriminate, I troll everyone around here. Haven't owned an M3 for four years.

04-27-2021, 08:30 AM	#17273
atopa2002 Lieutenant 203 Rep 538 Posts Drives: Z3M, 2013 e92 M3, F15 X5 Join Date: Jan 2006 Location: Richmond,VA iTrader: (2)	Guys is this crack a concern or not , pfc rotor I bought used Measures 31.5 , new is 32 Thanks Attached Images
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04-27-2021, 08:33 AM	#17274
fsmtnbiker First Lieutenant 620 Rep 327 Posts Drives: E92 M3, Evora S, E36 Join Date: Jul 2013 Location: Phoenix, AZ iTrader: (0)	Not a concern. __________________ Chris
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04-27-2021, 09:59 PM	#17281
kayha12 Second Lieutenant 331 Rep 285 Posts Drives: M3 Join Date: Mar 2018 Location: Frederick, MD iTrader: (1)	My stoptech rotors have looked like that after 1 event, been running them for 3 seasons now hahah __________________ NASA Mid Atlantic - *TT3 #97* '12 E92 M3 ZCP Sponsored by Andrewtech Automotive
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04-27-2021, 11:43 PM	#17282
redpriest Colonel 2147 Rep 2,527 Posts Drives: 2011 M3/Porsche 992 GT3RS Join Date: Apr 2014 Location: Bay Area, CA iTrader: (0) Garage List 2024 Porsche 911 GT3RS [0.00] 2021 Porsche 718 Sp ... [0.00] 2021 Mazda Miata MX-5 [0.00] 2006 BMW M3 [0.00] 2011 BMW M3 [10.00]	This is a 26 track day rotor with a crack on the edge - I retired them after I saw this. Attached Images __________________ '06 BMW M3 ZCP 6MT \| JRZ RS Pro + Hyperco 650/750 \| Epic Tune \| Brembo 355mm BBK \| too many to list '11 BMW M3 ZCP DCT \| Akra Evolution \| Eventuri intake \| MCS 3-way \| 4.6L Carbahn S65 \| Zebulon Aero \| AP Racing Radi-CAL BBK by Essex \| 305/645-18 Pirelli DHB Porsche 992 GT3, 991.2 GT3RS, 718 Spyder instagram.com/titomanlio
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04-27-2021, 11:45 PM	#17283
roastbeef Lieutenant General 11586 Rep 12,726 Posts Drives: E92 M3 Join Date: Nov 2010 Location: Orange County, CA iTrader: (4)	It's not cracked until you can see daylight through it. Attached Images __________________ Instagram; @roastbeefmike
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04-28-2021, 08:41 AM	#17284
Ximian . 1919 Rep 1,889 Posts Drives: E92 M3 Join Date: Oct 2016 Location: MN iTrader: (1) Garage List 2011 BMW M3 [0.00] 2021 BMW M3 [0.00]	Cracked rotors are like toilet paper, you can use both sides until they're done.
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04-28-2021, 12:22 PM	#17287
dparm Stop the hate, get a V8 3850 Rep 8,625 Posts Drives: C7 Corvette GS, AMG C63 S Join Date: Jun 2013 Location: Frisco, TX iTrader: (1)	It depends on how hard you drive the car, tires, cooling, pad choice, rotor size, etc. I could get 26 days if I just do one session a day... __________________ Now: 2017 Corvette Grand Sport, 2021 AMG C63 S sedan Past: 2011.5 M3 sedan ZCP
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04-28-2021, 01:49 PM	#17290
redpriest Colonel 2147 Rep 2,527 Posts Drives: 2011 M3/Porsche 992 GT3RS Join Date: Apr 2014 Location: Bay Area, CA iTrader: (0) Garage List 2024 Porsche 911 GT3RS [0.00] 2021 Porsche 718 Sp ... [0.00] 2021 Mazda Miata MX-5 [0.00] 2006 BMW M3 [0.00] 2011 BMW M3 [10.00]	I'll add that Brembo's Type 3 rotor survives only 6 or 7 days in my hands on my E46, same with stoptech rotor. This is why I like the AP kit so much - I regularly get 20+ days on a single rotor. The rear rotors on my E92 have 80 days on them. __________________ '06 BMW M3 ZCP 6MT \| JRZ RS Pro + Hyperco 650/750 \| Epic Tune \| Brembo 355mm BBK \| too many to list '11 BMW M3 ZCP DCT \| Akra Evolution \| Eventuri intake \| MCS 3-way \| 4.6L Carbahn S65 \| Zebulon Aero \| AP Racing Radi-CAL BBK by Essex \| 305/645-18 Pirelli DHB Porsche 992 GT3, 991.2 GT3RS, 718 Spyder instagram.com/titomanlio
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04-28-2021, 03:44 PM	#17291
jid2 Private First Class 239 Rep 170 Posts Drives: '12 E92 M3 ZCP Join Date: Jan 2010 Location: Maple Valley- Redmond, WA iTrader: (2)	Well guys I sold my car, now I'll just be around to troll Mr. Roastbeef... __________________ 2012 E92 M3 ZCP MCS 2WR coilovers 600F/900R, Performance Friction ZF54 front BBK, stainless lines, Ferodo DS 2500 rear pads, Hotchkins F/R swaybars, solid subframe mounts, BE Bearings, ARP rod bolts, Bimmerworld motor mounts, AFe intake, underdrive, CSF radiator, GT4 front lip (ebay), APR GT 500, ebay side skirts, RaceEng tug, 15mm/10mm spacers on ZCP wheels, Apex ARC 8 18x10 square track wheels with Pirelli 265 DH slicks
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