Howdy, me again.
Much like my old post, this is all about adapting other manufacturer brakes onto our cars. Except, this time I come equipped with wheels that will clear them, and more knowledge than my previous post had.
Short and hairy, I've bought a set of Porsche 958 Cayenne (10-17) brakes. From a fleabay wrecker, they came to a grand total of $450AUD. Considering that any other *brand name* 6 piston that isn't OE would go for nearly 10 times that, I think it's a good deal. Plus, I'm a masochist and enjoy figuring shit out that other people just pay for.
But Tim, why?
Well, I'll tell you.
- They're made by Brembo
- They're made for Porsche
- They're a monobloc caliper
- They're 6 piston
- They support upto a 360mm rotor and 36mm thick
- They are a radial mount (they don't have mounting ears - you use a manufactured mount)
- They look AWESOME
If you still have questions, you have no business in this thread and are required to leave, lest I flamethrow you for asking silly questions. Here's some pictures.
IMG_6940.JPG 128.98KB
1 downloads
IMG_6939.JPG 124.52KB
1 downloads
IMG_6938.JPG 109.95KB
1 downloads
IMG_6937.JPG 103.86KB
1 downloads
IMG_6936.JPG 131.03KB
1 downloads
Now, onto the adapting. Seeing as I can't find anyone else who has tried to fit these (and documented it), I'm going to do the nitty gritty.
First issue with these, is, how to physically mount them. I specifically hunted for radial mounted calipers for the simple fact, that they are a lot easier to mount than trying to make an adapter for ear-style mounts.
Thankfully, ze Germans make life easy as hell. https://epytec.de/uk...onfigurator-br1
I suspect that they will be cheaper than having someone local manufacture one-offs. And, given they make the brackets to TUV standards, I'll be safe.
The next issue. The big one. Rotors.
Oh, god, ROTORS.
The big issue here, is that a 360mm rotor is bigger than Subaru ever intended to put under a Subaru. And finding a 360x36mm rotor that comes with a 5x100 PCD, as I've found, is damn near impossible. So, whether I like it or not, a hub centric ring and redrilling of the rotors is going to be a necessity. Honestly, all things considered, that's not all that bad.
We need to be doing a collective thank you to Mercedes for these, though. Cheap, and easy to get.
rotor diamenions.jpg 139.63KB
1 downloads
So that's the Merc rotor, Brembo P/N: 09.B747.51.
Compared to our STi Brembo rotor...
STI rotor diamensions.jpg 115.5KB
1 downloads
Which, is actually quite similar.
The differences we need to note are as follows. (First line is Subaru, second is MB)
- 326 vs 360mm diameter
- 30 vs 36mm thickness
- 58mm vs 67mm hub bore centre
- 52.7mm vs 51.5mm rotor height (and therefore, offset)
- 148mm vs 154.3mm hub centre hole (where the wheel hub is accepted into the brake rotor)
- 100mm vs 112mm PCD (114.3 for post 04 STi)
As per the attached schematics and measurements I just mentioned, the differences are actually quite minuscule. Let's discuss.
The sizing is a given, but we know that we only require a 9mm thick hub centric spacer, just to keep the rotor centered on the hub, the rotor height is 1.2mm shorter but, we all know just how thick the STi Brembo calipers are. From my measurements, the Brembo BCZ calipers do seem to actually be more shallow. I'll measure that by comparison when I get a chance.
The PCD is really a non-issue, it's actually solved by one of the many PCD redrill kits you can buy online, and a bit of patience, or paying a half-way competent machinist to drill some holes. Simples.
The hub centre bore or "hole" is perfect. Nothing needs to be said about that.
So, the move from here is to acquire the various bits I've arranged from club members (I've found a wheel hub, some calipers and a ton of rotors) to do some mocking up and measure up that bracket. Mounting hardware goes without saying, Grd 12.7 all the way through.
Hope you all enjoyed the read and I'll be posting more info as I come up with it.
