[juld0zer]

Performance rotors come with a special reminder everytime you press the brake pedal. Some can accept that characteristic but most will hate it. Because brakes are supposed to make lots of friction silently

[Aus335iguy]

Originally Posted by juld0zer

Performance rotors come with a special reminder everytime you press the brake pedal. Some can accept that characteristic but most will hate it. Because brakes are supposed to make lots of friction silently

It's a great feature I look forward to.

[LMB335IS]

Originally Posted by juld0zer

Performance rotors come with a special reminder everytime you press the brake pedal. Some can accept that characteristic but most will hate it. Because brakes are supposed to make lots of friction silently

I personally love it. They make noise even when you're not on the brakes. It goes along my 335is exhaust, turbos spooling, and all the other wonderful noise my car makes.

[Aus335iguy]

Originally Posted by LMB335IS

I personally love it. They make noise even when you're not on the brakes. It goes along my 335is exhaust, turbos spooling, and all the other wonderful noise my car makes.

It's what petrol heads live for am I right ?

[peterparker]

Originally Posted by LMB335IS

I personally love it. They make noise even when you're not on the brakes. It goes along my 335is exhaust, turbos spooling, and all the other wonderful noise my car makes.

I actually hate the noise that these rotors make. Especially driving with the windows down. When these wear out I may go for the non dimpled version.

[feuer]

Originally Posted by peterparker

I actually hate the noise that these rotors make. Especially driving with the windows down. When these wear out I may go for the non dimpled version.

Is the slots that make the noise.

[bmuum3]

Finally got my front calipers powdercoated.
Just need to install now!

[Aus335iguy]

Originally Posted by bmuum3

Finally got my front calipers powdercoated.
Just need to install now!

Nice

Originally Posted by bmuum3

Finally got my front calipers powdercoated.
Just need to install now!

Who did your powdercoating?

[mariusc]

Does anyone know if the F8x rotors have the same height/offset as the Performance rotors? I see that they are much lighter. Since I have to get the rear calipers machined anyways, why not also get some brakes from a F80 and also mill down the rotors. I'm sure less than 5 mm is needed, as there is also some clearance between the rotors and calipers stock.

Yes, the pads will "hang" over the edge towards the center, but I inspected an M4 today and I could see that there is about 3-4 mm "unused" surface. Shouldn't be a problem.

And what about F80 rears? They are 370 mm, so they would have to be machined (much) more....

[Aus335iguy]

Originally Posted by mariusc

Does anyone know if the F8x rotors have the same height/offset as the Performance rotors? I see that they are much lighter. Since I have to get the rear calipers machined anyways, why not also get some brakes from a F80 and also mill down the rotors. I'm sure less than 5 mm is needed, as there is also some clearance between the rotors and calipers stock.

Yes, the pads will "hang" over the edge towards the center, but I inspected an M4 today and I could see that there is about 3-4 mm "unused" surface. Shouldn't be a problem.

And what about F80 rears? They are 370 mm, so they would have to be machined (much) more....

Hi mate
I don't think it'll be that simple but I'm happy to be corrected. The 370mm are much bigger discs to fit on the rear and so the calliper would need to move out radially much more than the 2mm we normally have to elongate the holes. You'll either need a custom bracket or manage an f80 knuckle on an e90...

M4 discs on the front has already been discussed and that also won't fit without serious modifications as well

[juld0zer]

Personally i would not do it. All BMW rotors are balanced at the factory and when you start taking away material even if everything was done 100% accurately you don't want to risk vibration or add the cost of balancing the discs.

Don't take this the wrong way but it is too much effort to make it worth it.

[feuer]

Originally Posted by mariusc

Does anyone know if the F8x rotors have the same height/offset as the Performance rotors? I see that they are much lighter. Since I have to get the rear calipers machined anyways, why not also get some brakes from a F80 and also mill down the rotors. I'm sure less than 5 mm is needed, as there is also some clearance between the rotors and calipers stock.

Yes, the pads will "hang" over the edge towards the center, but I inspected an M4 today and I could see that there is about 3-4 mm "unused" surface. Shouldn't be a problem.

And what about F80 rears? They are 370 mm, so they would have to be machined (much) more....

Machining F8x M rear rotors to use on the rear of non M would be rather stupid. Sorry. It needed to be said. You need to machine 370mm down to 345mm. Hat on M rotor is bigger so there won't be much pad area left. On top is different offset. If you want to go this route with machining rotors go with E9x M rotors that are same design (all M rotors are) and are 350mm and correct offset. Research is the mother of modifications like this. You need to do some leg work here.

[mariusc]

Thanks for the feedback guys.

I know someone has to do the research, but last time I checked, I couldn't find the data sheet with all the dimensions from ATE or Brembo.

feuer , is the E9x M rotors the same offset as the F30 Performance rotors?

Regarding the front rotors, what was the serious modifications that was needed? If the offset is the same as the Performance rotors, they should fit with some milling. Can't believe they will suddenly be unbalanced with this modification either.

I'm probably going to find a set of M Sport brakes, but there's not much available for a fair price.

[Aus335iguy]

Originally Posted by mariusc

Thanks for the feedback guys.

I know someone has to do the research, but last time I checked, I couldn't find the data sheet with all the dimensions from ATE or Brembo.

feuer , is the E9x M rotors the same offset as the F30 Performance rotors?

Regarding the front rotors, what was the serious modifications that was needed? If the offset is the same as the Performance rotors, they should fit with some milling. Can't believe they will suddenly be unbalanced with this modification either.

I'm probably going to find a set of M Sport brakes, but there's not much available for a fair price.

ATE and brembo both have webpages and ATE has an app that will give you what you need. The same question about f80 discs was asked a page or two back and there's a link to a Russian webpage that shows the spacers and a calliper mod that would need to be done for the front.
The f30 calliper are the same as f80 and are usually cheaper. You'll still need pads and discs ...

[feuer]

Omg, @mariusc I can't believe that you aren't willing to do any research on your own. Here:
- outside diameter: 350.0 mm (13.78")
- annulus diameter: 220.0 mm (8.66")
- face width: 65 mm (2.56")
- overall depth: 66 mm (2.60")
- initial disc thickness: 24.0 mm (0.945")
- discard thickness: 22.4 mm (0.882")
- bore diameter: 79.0 mm (3.11")
- hub to center disc distance: 51.0 mm (2.01")
- lug spacing: 5 x 120 mm
- internal parking brake shoe diameter: 185 mm (7.28")
- mass: ~8.95 kg
- weight: ~19.7 lbs

Bottoms line: same offset and only 5mm larger than F30 345mm rear

Now I accept some donation.

[bmuum3]

Originally Posted by FCobra94

Who did your powdercoating?

One of my buddies.

[bmuum3]

So I was able to get my brakes done!!!! The fronts were a direct swap from a 435i using the 340mm rotors. The rear calipers are the 2-piston calipers from the 135i. I used a F10 535i rotor and trimmed the dust shield. Took me a couple of times to bleed and get the pedal nice and firm, but using INPA definitely helped a lot.

I must say I don't notice that much of an increase in stopping power, but I haven't taken it to the track. As for the looks aspect, it was well worth the conversion. The yellow against the alpine white looks stunning, but I am a little biased.

Pictures coming once I wash her up.

[mariusc]

Originally Posted by bmuum3

The rear calipers are the 2-piston calipers from the 135i. I used a F10 535i rotor and trimmed the dust shield. Took me a couple of times to bleed and get the pedal nice and firm, but using INPA definitely helped a lot.

Did you have to mill down these calipers with the F10 rotors?

I ended up ordering a set of a new F30 Performance kit with everything included except rear rotors. Waiting for it to arrive. Can't wait!

[feuer]

mariusc please re-read bmuum3 post! He used 135i calipers!

[mariusc]

Originally Posted by feuer

mariusc please re-read bmuum3 post! He used 135i calipers!

Yeah, I know, but if it's bolt on except for elongating the holes, it would be a much easier way to do it. Next time...

[feuer]

Originally Posted by mariusc

Yeah, I know, but if it's bolt on except for elongating the holes, it would be a much easier way to do it. Next time...

135i calipers are straight bolt on. You seriously need to do more research.