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      08-30-2018, 04:07 PM   #67
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Originally Posted by tux2005 View Post
Running race pads cold, their more aggressive material wear the deposit off.
That's the correct cure.
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      08-30-2018, 04:08 PM   #68
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Quote:
Originally Posted by pruettfan View Post
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Originally Posted by M2TT View Post
Yes, both OEM pads and rotors.
Well, I believe it's a true warp since the mechanic used a machine to measure the "bend".

If it would be a coating there would be noticeable material on the top of the discs I believe?
Also I did a few more hundred Km since then and there's no big improvement.

Anyway, what is that cure?
Zero chance that you can "warp" these rotors with the OEM pads on track. Not possible, you have transfer of the brake material. Next time prep the car properly with track pads, and proper medium viscosity brake fluid that has a high boiling point. Both will result in far better track performance that is safer and will not result in this problem. I have brought my rotors to well over 600 degrees F every session and after more than a dozen days on track not a problem. It is important to note that track pads are not desirable for day to day driving so most of use swap pads before the weekend.

Best of luck
Totally correct.
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      08-30-2018, 04:27 PM   #69
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M2 brake issues with OEM pads https://f87.bimmerpost.com/forums/sh....php?t=1419776
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      08-31-2018, 03:47 AM   #70
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Thanks for the tips!

Last question, how can I know if this is actual pad deposit and not warped rotors?

My mechanic used this to measure:

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      08-31-2018, 08:39 AM   #71
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We are telling you he will be able to measure a change in the surface but it is not a warp but built up material. You can pick who you want to believe but the solution is up to you also. It wouldn’t hurt to get some good track pads (if you plan on tracking in the future) and seeing if they can remove the residual. If not most have to replace the rotor. That happened to a buddy . at this point prevention is the key, pick the proper pads and fluid for your use. And switch as needed. Cheap insurance and you’ll have a better track day on the correct pads.
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      08-31-2018, 11:56 AM   #72
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Quote:
Originally Posted by pruettfan View Post
We are telling you he will be able to measure a change in the surface but it is not a warp but built up material. You can pick who you want to believe but the solution is up to you also. It wouldn’t hurt to get some good track pads (if you plan on tracking in the future) and seeing if they can remove the residual. If not most have to replace the rotor. That happened to a buddy . at this point prevention is the key, pick the proper pads and fluid for your use. And switch as needed. Cheap insurance and you’ll have a better track day on the correct pads.
I already picked some good pads, fluid and brake lines.

I'm just "afraid" of using new pads with a potentially warped rotor.
If I knew for certain it was material buildup it would be an easy choice. But I'm reticent due to the mechanic telling me he doesn't believe it's other thing but the rotor itself.
I took a very close look at it and the first contact appears to be the rotor itself and nothing else on top.

It's not that I doubt you or the mechanic, it's just it appears there's no way of telling for certain, unless I am up to scratching the new pads.
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      09-02-2018, 12:10 PM   #73
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Quote:
Originally Posted by nd2002 View Post
Picked up production prototypes today. Installed without TOO many hitches.

I stripped one of the retaining screws in front and spent about 1.5 hours drilling it out.

Otherwise they fit perfect and are great quality.
Can you order any of these Girodiscs for the M2 anywhere?
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      09-08-2018, 07:23 PM   #74
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Quote:
Originally Posted by M2TT View Post
Quote:
Originally Posted by pruettfan View Post
We are telling you he will be able to measure a change in the surface but it is not a warp but built up material. You can pick who you want to believe but the solution is up to you also. It wouldn’t hurt to get some good track pads (if you plan on tracking in the future) and seeing if they can remove the residual. If not most have to replace the rotor. That happened to a buddy . at this point prevention is the key, pick the proper pads and fluid for your use. And switch as needed. Cheap insurance and you’ll have a better track day on the correct pads.
I already picked some good pads, fluid and brake lines.

I'm just "afraid" of using new pads with a potentially warped rotor.
If I knew for certain it was material buildup it would be an easy choice. But I'm reticent due to the mechanic telling me he doesn't believe it's other thing but the rotor itself.
I took a very close look at it and the first contact appears to be the rotor itself and nothing else on top.

It's not that I doubt you or the mechanic, it's just it appears there's no way of telling for certain, unless I am up to scratching the new pads.
Take it from me, you have excess OEM pad material unevenly distributed on your rotors. I had this exact same issue when I tracked my M2 with OEM pads. The rotors are not warped. Believe me I've been there. Once the OEM rotors got cleaned up by running Pagid RS29s on the street for a couple of weeks I now swap pads between track events. Easy to do and once you get it down it only takes 40 minutes including the time it takes to jack up the car and remove the wheels.
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      09-09-2018, 07:29 AM   #75
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I don't think they are available yet. The person who has them now, is running a prototype.

Quote:
Originally Posted by Franzino View Post
Can you order any of these Girodiscs for the M2 anywhere?
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      09-09-2018, 06:10 PM   #76
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I believe they sell their product directly so it would be worth contacting them for first hand info. A month or so before they created this first set I emailed and asked if they would offer an option for our cars but never received a response but now that they have developed something hopefully they will respond
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      09-24-2018, 09:42 PM   #77
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Quote:
Originally Posted by Twt View Post
I just received the Stoptech front two piece rotors from Turner. They look good and weigh 23/10 vs 25 for OE. I will install them this week and test them at Sebring in May. The fact that they claim 60% more air flow , are lighter and only slightly more expensive than OE appears to be a descent upgrade.
Attachment 1812367
Any updates on these? Would you recommend over stock now that you've had them a while? Mine are about spent and I'm looking at all options. What pads are you running?
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      09-25-2018, 10:25 PM   #78
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Quote:
Originally Posted by Pyrat 2 View Post
Any updates on these? Would you recommend over stock now that you've had them a while? Mine are about spent and I'm looking at all options. What pads are you running?
I am very happy with these rotors....so far they seem to be indestructible. I run PFC08 and ran them at Sebring, Road Atlanta, AMP and Charlotte. As I mentioned, the street noise is about half the amount I had on OE so I leave the PFCs on all the time.
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      12-08-2018, 01:30 PM   #79
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emailed giro, no respond ..
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      04-23-2019, 07:23 AM   #80
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Quote:
Originally Posted by M2TT View Post
Thanks for the tips!

Last question, how can I know if this is actual pad deposit and not warped rotors?

My mechanic used this to measure:

That appears to be an aftermarket one piece rotor on an E46?
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