[mlhj83]

Originally Posted by RickyBobby

Has anyone else running the PFC rotors noticed that the centering ring is ever so slightly larger than the stock rotor's? It makes it impossible to center the rotor on the hub and results in a wheel vibration that feels like an imbalanced wheel. I can't seem to get a returned call from PFC in the 3 months that I've been leaving them messages. I've run dozens of cheapo centric rotors and never had such a poor fit as these $900 rotors.
I do like the design of the PFC rotor but I will certainly be keeping a watchful eye on mine after reading this thread.

The rotor in the 1st post does look a bit glazed but the stress cracks don't look that bad to me. Perhaps it's hard to tell from the picture but the cracks don't seem to run to the edge of the rotor. My stock rotors looked about the same when I ditched them for the PFC's.

Originally Posted by JamesClay

These were made using sample parts from our old project car, now our #79 car, which PFC held through the prototyping stage. We bought the entire first production run of these. We more recently measured cars and measured our stock - all is correct. There is a step on the hub which could cause an error in measurement, but the fit is correct. There has been no change in spec from PFC and there has been no obvious change in hub or hub PN from BMW. We have never had reported issues from our customers on this part and I would expect that to remain the same.

Originally Posted by attila

OMG!!! Balancing the wheels kills me since I have the PFC rotors!! Now I have an answer!! I rebalanced my front wheels at leat 4 times, have the front suspension recheked two times, and no one could figure out why I have the steering wheel vibration. It starts about 75-80 and it is very very annoying!!
I will reinstall my old rotors and if it is the PFC rotor i will never ever get close to any PFC product!!!

Originally Posted by RickyBobby

The customer service from PFC has been horrendous. It took months to get any type of call back from them just to have a dialogue about the fitment. You'd think if a company heard that someone was having an issue with their rotors they would want to get to the bottom of it.
After I convinced PFC that they were not installed improperly because the alignment pins only allow for installation in one orientation, there responses were as follows:

"The engineers at Performance Friction have determined that the spindles (hubs) are not "OEM" from the factory, even though, they still may be the original ones that came on your car, or some type of aftermarket spindles. There was a slight change and these do not correctly fit the PFC hats. Their suggestion was to source or have some centering rings fabricated to aid in keeping the hat tight around the hub."

I replied saying that I bought the car with 0 miles on it and have not changed the hubs. My OEM wheels, 2 sets of aftermarket wheels and 2 sets of oem rotors fit the spindle just fine. Also worth noting is that the part numbers for the rotors and hubs have not changed from 08 +

PFC's response: as I’ve said it is obvious that there has been a model year change. We currently do not make the exact hat to fit this application. Possible in the future."

It's disappointing that a company that markets their products as having high tolerances (and charges a premium for it) has such poor fitment on my car. By my measurement, the center hole on my PFC rotors are approx .5mm larger than my oem rotors. While this is small variance, it makes it impossible to perfectly center the rotor which causes vibration at freeway speeds that feels like an imbalanced wheel. When you spin the rotor by hand, you can see it moving in a slight elliptical pattern. I've been running cheapo centric rotors for about 10 years on other track cars and never experienced any fitment issues like this.
At any rate, I just sent the rotors back to PFC last week for inspection so we'll see where that goes. I'll keep everyone posted. For now, I'd stay away from these. Tirerack actually sells Centric rotors for the e9x M3 now, but only drilled. They said that they will eventually carry standard non-drilled. Perhaps those are the better option for us. Too bad, because I do like the design of the PFC rotor.

Originally Posted by RickyBobby

Sounds like you could have the same problem. When I put my oem rotors back on my vibration went away.
When you re-install your old rotors measure the center hole of the OEM and PFC's and see if they have any variance. It would be nice to show that I'm not the only one affected.

Originally Posted by M3SQRD

I have the PFC BBK, front and rear, and have had no rotor fitment issues nor do I have a vibration/unbalance due to the rotors.

I'm guessing the designs of the mounting hats are different between the stock and BBK rotors due to rotor thickness and/or caliper placement but they had to be designed using the same measurements taken from James' stock e92 M3. The current issue of GRM has a brake pad comparison test and they used PFC rotors for all pads, and if James thought there was a safety issue with the basic design I doubt he'd be heading into the turn 1 braking zone at VIR > 150 mph as well as using them on the GS race cars. I could be wrong but I believe Ganassi Racing uses the same design on their DP race cars.

For people considering the PFC BBK...Compared to the AP Racing BBK on my e46 M3, the PFC calipers have better initial bite/release characteristics and modulation. I've never driven an e9x M3 with APs calipers so I can't make a direct comparison. However, comparing the two setups I'd have to say overall braking performance is very similar (no fade, no soft pedal under extreme conditions) and given the extra weight of the e92 M3 (plus my e46 is not at stock weight) that's impressive - if I had to do it all over again I'd still go with PFC. Feel free to PM me if you have any other questions.

Right, time for my turn regarding issues with PF DD V2 in OEM size for OEM caliper.

Purchased a couple of months back, had it professionally installed (hubs cleaned), and vibration was detected at 75mph onwards (not under braking). Measurement showed runout out of about 1mm in the radial and lateral direction on both discs. PF discs were sent back to PF (still investigating the cause) and the OEM discs were put back on. Results: no out-of-tolerance runout or vibration with OEM discs.

PF have sent a new set without explanation as to why the previous set was defective. Replacement PF discs awaiting fitment and measurement of runout. What is going on with PF?