LP640 replacement Rotors?

So as the result of a couple of fast stop and goes during a spirited run I have warped my rotors. Happened about 500 miles ago and the shudder on hard braking is driving me insane. I thought they were able to be cut to true (old school muscle car guy) but I guess this isn't an option. (Correct me if I'm wrong)

 

I am now on the hunt for aftermarket options. I saw the giro disc rotors for $1500 which seems reasonable considering the OEMs are more than double.

 

Anybody have an opinion on these? Any other suggestions? I've seen the carbon upgrade pad and rotor kits for other cars, not sure it's worth the trouble vs just plug and play replacement steel rotors.

 

I found it odd that the rotors would warp so easily but I guess I was probably foolishly pushing it a little hard. Btw, I was running with an F12 and the warped rotors were totally worth it.

Someone else on here resurfaced their rotors. I don't see why they can't be turned or ground, unless they would be below the required thickness.

 

http://rennlist.com/forums/993-forum/41658...led-rotors.html

Someone else on here resurfaced their rotors. I don't see why they can't be turned or ground, unless they would be below the required thickness.

 

http://rennlist.com/forums/993-forum/41658...led-rotors.html

 

 

That's what I thought too, but the local machine shops say they are too big for the machine. Maybe somebody knows a shop that will cut them?

That's what I thought too, but the local machine shops say they are too big for the machine. Maybe somebody knows a shop that will cut them?

I've had Napa Auto parts of all places turn lamborghini rotors in the past. But judging by yours warping so easily, there's a chance these were not virgins to the lathe...the minimum thickness is written right on rotor front. Use a micrometer and check to see what you have to play with...

I've had Napa Auto parts of all places turn lamborghini rotors in the past. But judging by yours warping so easily, there's a chance these were not virgins to the lathe...the minimum thickness is written right on rotor front. Use a micrometer and check to see what you have to play with...

 

I'll check tomorrow and reach out to a buddy at Napa. I hope I have some meat on them with only 10k miles

Depending on how many miles are on the rotors, it might just be worth it to replace. If you opt to turn them, there are quite a few performance shops in the area. I would have to think someone would have a machine that could handle the rotor size. Your LP looks sinister in all black.

I am now on the hunt for aftermarket options. I saw the giro disc rotors for $1500 which seems reasonable considering the OEMs are more than double.

 

Anybody have an opinion on these? Any other suggestions? I've seen the carbon upgrade pad and rotor kits for other cars, not sure it's worth the trouble vs just plug and play replacement steel rotors.

 

I found it odd that the rotors would warp so easily but I guess I was probably foolishly pushing it a little hard. Btw, I was running with an F12 and the warped rotors were totally worth it.

 

I put Girodisc rotors (slotted not drilled) on my '06 G back in 2008 after warping the stock rotors on the track; also switched to autocross Pagid pads at the same time. Other than the great increase in dust, the braking was greatly improved after that. Fast forward eight years and 7000 miles, and my Girodisc rotors have a shudder to them. I emailed them, not to ask about that, but simply to confirm that my 2008-era rotor hats would be compatible with their currently shipping rotor rings, and to confirm part numbers. I got a reply a day later from Mike there advising me that they had determined a small number of their hats from that time frame were slightly out of spec and could have lead to increased wear, so if I'd like, send them in and if they're found to be out of spec, they're going to replace the hats and rotors for free, if not, then they'll still mount the new rotors for me and ship them back so I don't have to do it myself. I was pretty happy with that response for someone who hasn't bought from them for eight years; they could have just as easily said yep that's the correct part, order away. Haven't had a chance to pull them off the car yet, but did a full brake change on my Audi Q7 couple weeks ago and now I feel like I could take an entire car apart after that nightmare lol.

 

I'm thinking about doing Girodisc rotors for my '03 Murci, with more aggressive pads, because I hate the stock brake performance.

I put Girodisc rotors (slotted not drilled) on my '06 G back in 2008 after warping the stock rotors on the track; also switched to autocross Pagid pads at the same time. Other than the great increase in dust, the braking was greatly improved after that. Fast forward eight years and 7000 miles, and my Girodisc rotors have a shudder to them. I emailed them, not to ask about that, but simply to confirm that my 2008-era rotor hats would be compatible with their currently shipping rotor rings, and to confirm part numbers. I got a reply a day later from Mike there advising me that they had determined a small number of their hats from that time frame were slightly out of spec and could have lead to increased wear, so if I'd like, send them in and if they're found to be out of spec, they're going to replace the hats and rotors for free, if not, then they'll still mount the new rotors for me and ship them back so I don't have to do it myself. I was pretty happy with that response for someone who hasn't bought from them for eight years; they could have just as easily said yep that's the correct part, order away. Haven't had a chance to pull them off the car yet, but did a full brake change on my Audi Q7 couple weeks ago and now I feel like I could take an entire car apart after that nightmare lol.

 

I'm thinking about doing Girodisc rotors for my '03 Murci, with more aggressive pads, because I hate the stock brake performance.

 

That sort of customer service feedback is very reassuring when making a purchase. Thank you. I'm about to pull the trigger in a couple of days on the girodisc as I do a bit more research. I agree in the 03 brakes. I had a an 04 gated, loved the third pedal, hated the brakes. My 08 stops amazing (until I ruined the rotors)

Since we're on the topic of early Murci brakes, everyone should avoid the rotors with pedestal internal construction instead of veins. I had a pair pop up for my '02 from an authorized dealer and now they are all over eBay. The construction is CRAP compared to the oem brakes. Spend the extra for decent rotors.

 

Left is OEM, right is aftermarket:

 

 

Top is pedestal, bottom is OEM:

 

 

 

I put Girodisc rotors (slotted not drilled) on my '06 G back in 2008 after warping the stock rotors on the track; also switched to autocross Pagid pads at the same time. Other than the great increase in dust, the braking was greatly improved after that. Fast forward eight years and 7000 miles, and my Girodisc rotors have a shudder to them. I emailed them, not to ask about that, but simply to confirm that my 2008-era rotor hats would be compatible with their currently shipping rotor rings, and to confirm part numbers. I got a reply a day later from Mike there advising me that they had determined a small number of their hats from that time frame were slightly out of spec and could have lead to increased wear, so if I'd like, send them in and if they're found to be out of spec, they're going to replace the hats and rotors for free, if not, then they'll still mount the new rotors for me and ship them back so I don't have to do it myself. I was pretty happy with that response for someone who hasn't bought from them for eight years; they could have just as easily said yep that's the correct part, order away. Haven't had a chance to pull them off the car yet, but did a full brake change on my Audi Q7 couple weeks ago and now I feel like I could take an entire car apart after that nightmare lol.

 

I'm thinking about doing Girodisc rotors for my '03 Murci, with more aggressive pads, because I hate the stock brake performance.

Great story!

 

The small front calipers and rotors are not adequate for the 02-04 Murci's performance capabilities. Pads and fluid will help, but the root of the problem is the physical size.

Well an update. I spoke to a local truck shop down the street that said they had a machine big enough for the rotors. I took one off in 10 minutes and couldn't get the other one off to save my life. Fearing damage (I know all the pounding with hammer, penetrating oil, etc) I said screw it, and see if they could even cut the one I took off.

Well they said that they drilled rotors can't be cut. I think it's BS but I've decided to just order the Girodisc rotors and be done with it.

I'll report back on the new rotors once installed

Still going to need to get that other one off. :-)

 

Maybe PB Blaster? I used that and let it soak for a day to get some ridiculously over torqued factory caliper bolts off my wife's Q7.

To my knowledge, unless things have changed, you cannot turn a cross drilled rotor. The cutter will catch. Also, with cross drilled, you have to be careful when you get light on the rotors, as many times the cross drilled holes will start to crack. You should check that.

 

I am curious though as to how you warped them. If you were on the street, just driving hard with another car, I would be shocked that you warped them there. Question, when you got done drilling it on the street with the other car, did you within a short time period pull over and park? You have to be very careful applying the parking brake after a hard session on the brakes, as you can impress the parking brake into the rotor, causing them to shudder badly. Just an idea, as when you track a car, one thing they teach you when you come into the pits is to not apply the parking brake for this reason, and to only leave the car in gear on a level surface.

So as the result of a couple of fast stop and goes during a spirited run I have warped my rotors. Happened about 500 miles ago and the shudder on hard braking is driving me insane. I thought they were able to be cut to true (old school muscle car guy) but I guess this isn't an option. (Correct me if I'm wrong)

 

I am now on the hunt for aftermarket options. I saw the giro disc rotors for $1500 which seems reasonable considering the OEMs are more than double.

 

Anybody have an opinion on these? Any other suggestions? I've seen the carbon upgrade pad and rotor kits for other cars, not sure it's worth the trouble vs just plug and play replacement steel rotors.

 

I found it odd that the rotors would warp so easily but I guess I was probably foolishly pushing it a little hard. Btw, I was running with an F12 and the warped rotors were totally worth it.

these rotors don't normally warp..

 

Odds are you have finally gotten enough heat onto the rotors to transfer pad material onto the rotor. It is amazing how the slightest amount of pad material on a rotor can make the worst feel. If you got the rotors extremely hot and then you stopped and kept your foot on the brake, then you transfer pad material onto the rotor. In racing you get very used to not setting an emergency brake, or pressing on the brake pedal at a stop, because if you transfer that material to your rotor it is a mess.

 

you can just put a very abrasive pad on and drive it. that will usually take the added material back off the rotor. not sure they make many pad materials for our calipers.

 

It's crazy how they use stock pads that destroy the rotor and not the pad.. Pad's are cheap compared to rotors.. On my race car my rotors never wear. They look brand new other than the heat check cracks and the colored stress on them. On lambo's replacing the pad material with a more aggressive pad that is rotor friendly is a good idea. Better braking and better rotor wear. Just be prepared to dust off the wheels after every drive.

Buy giro disc rotors.

You can turn old rotors that have been drilled/slotted what ever if you find someone. I wouldn't bother though.

 

I'd suggest you upgrade the front rotors to an 04 Murcie rotor/caliper as its cheap and needed.

To clarify I felt the shudder for the first time during my 3rd or 4th hard stop on the fatefull day. Parking brake wasn't applied until about 30 minutes of normal/cool down driving. I honestly know the exact moment when the problem began. I took the liberty of Lightly hand sanding the rotors and pads today since the calipers were off anyways thinking it might have been excessive pad material deposited on the rotors. Haven't had a chance to drive since Miami weather sucks right now. I doubt it will help but who knows.

 

As far as replacing the rotors. I'm taking it to my independent lambo mechanic and will let him enjoy banging on the old rotor.

I would like to say this is possible. I had similar sized brakes if not bigger on my E60 M5 and people were able to have those turned. I'll find out where and what type of machine was used. +1 for whoever mentioned PB Blaster.