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Old 05-29-2013, 09:40 AM   #1
dcramer
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Rallyroad BBK upgrade

Cobbled together all the parts finally. Calipers being the most expensive.


Only thing I didn't count on was the rear brakes on a porsche are mounted in front of the axle. Brembro's are directional calipers. In order to keep the bleed screws at the top the transfer line and the bleed screws need to be swapped.
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Old 06-10-2013, 10:47 AM   #2
dcramer
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Took em to the track on the weekend. They ain't so pretty anymore

They work awesome! Braking into 5 was much more comfortable.

Also for anyone wanting to cheap out on wheel bearings. This particular wheel had an aftermarket bearing in it (The hub size is bigger than stock) and it failed on the weekend.

For the extra few bucks stick with OEM on integral parts like wheel bearings.
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Old 06-10-2013, 10:59 AM   #3
SiR
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what was the wheel bearing make?

calipers look great.
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Old 06-10-2013, 11:02 AM   #4
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Not sure about the wheel bearing. I only recalled last time I looked at a BBK there is a note about the size of the hub being larger than stock so the hat doesn't fit.

I'll get it off tonight, will let you know.
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Old 06-10-2013, 08:55 PM   #5
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the old bearing was an FAG
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Old 06-10-2013, 10:20 PM   #6
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interesting. fag makes a quality bearing(and is OEM no?).

how was the hub bigger than stock? would your wheels not fit on the car then?
what rotors were you using?

thanks for the update
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Old 06-10-2013, 10:32 PM   #7
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The flange the wheel bolts to is actually a few mm bigger than stock.

Some BBK rotor hats do not fit on that particular flange. The distance from the wheel bolt holes to the outside of the flange is noticeably smaller on the stock bearing than the FAG bearing. Turns out a friend had an SKF bearing for the car, replaced it tonight.

Someone really reefed on the nut though, way past 214 ft/lbs based on where it was staked vs where it is now.
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Old 06-10-2013, 10:39 PM   #8
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which rotors(and size) are you using?


anything ive ever seen says skf is inferior to the fag units...however its splitting hairs really. Youd be fine with either.

I think fag makes the oem bmw units. the one thing the original bearings will have an advantage on most new things is they are actually made in germany. I think a lot of stuff is made in china these days and reboxed in germany and sold as "made in germany". Ive read this as being quite common.
Obviously in quality controlled facilities but it seems not quite as up to par as old parts used to be.
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Old 06-10-2013, 10:50 PM   #9
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I'm actually using E46 M3 rotors they fit fine, as do stock E36 rotors.

The big bonus on this particular bearing was it was free. He had a bunch of spare parts left over from a race team.

It will get me through the season one way or another.

I'll measure the flange when I get time. I'm pretty sure it's an ecstuning BBK that I was looking at that didn't fit.
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Old 06-11-2013, 06:00 PM   #10
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OK, have pics of the hubs


The first pic the one on the right is the SKF. You can see the wheel stud holes are closer to the outside edge.

The second pic the caliper is 54.8mm. The third pic the caliper is 56.2mm
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Old 06-13-2013, 11:48 AM   #11
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so you are saying the fag is bigger diameter and caused issues with whatever rotor you are using?
the hat wouldnt fit properly over it?

what kind of rotor is it?(the make)


how do you know the fag is actually bigger than what came on the car from bmw without actually comparing it to the bmw stamped piece(which was likely made by fag fyi)


this just sounds like some minor variance when fitting different aftermarket pieces together.(the issue could be the rotor hats themselves,the bearing or none at all. Maybe it was badluck and you got both on their outer tolerance limits) and since they are from different companies its possible there is some over lap with those limits.
I should measure my bearings to compare. As far as I know mine as still oem(and two need replacing)
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Old 06-13-2013, 02:56 PM   #12
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No, what I was saying is that I knew that the bearing was aftermarket because the flange was bigger, however there is evidence that FAG makes the OEM bearing, but they must make two versions of it.

All OEM parts fit on these flanges. There is one aftermarket brake kit that does not.

I expect this is just failure from track use. Left front gets lots of abuse at mosport
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Old 06-13-2013, 04:04 PM   #13
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Yea, I don't think the size of the hub matters for stock rotors as the rotors are held to the hub with the set screw and centered by the CB of the hub flange, ie not a direct fit to the hub like some cars.

The different hub sizes does not effect stock setups, it only effects some aftermarket BBK that were made with close tolerances to the smaller hubs. Which is good to know.
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Old 06-14-2013, 10:34 AM   #14
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the set screw is only there as part of assembly at the factory.
its pretty much useless otherwise and can be a huge pita. once out I dont usually put them back on.

but ya looks like some aftermarket rotors could cause some issues. good thing to watch for.


what rotor make had the problems?
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Old 06-14-2013, 10:51 AM   #15
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Well everyone thinks you need to reef on the set screw to tighten it. I pretty much just hand tighten it. Where's it gonna go after all. With the e46 rotors on my car right now they don't fit at all, as they moved them so that they don't line up with the studs, and it is a bit of a pain to make sure the studs are lined up if they move.

It's either the stoptech kit or performance friction, can't remember which now.
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