Porsche Brembo 996 BBK conversion

[Sprp85]

Thanks for chiming in Tbone, Obioban & Repoman;

So in short, the E46-spec RG-R can clear 996 BBK with spacers, and as offset on RG-Rs is determined by the barrel position, a rather conservative offset is actually beneficial in this case.

And since the E39-spec RG-R is already sitting pretty far out at 8.5 width + ET22 and it will be difficult to slap on a decent-sized spacer on them, thus it won't work for 996 BBK. Yea?

[repoman89]

I’ve got ST40s under 18” RG-Rs on my e39 M5, with no issue…

I’m talking about a test fit of the E39 spec front RGR on the front of an E46 M3 with 996 front brakes. That fitment isn’t close. The M5 front hub must have the brakes mounted further inward — I know people only need small and sometimes no spacer to run Brembo GT kits on that chassis as well.

[Obioban]

I’ve got ST40s under 18” RG-Rs on my e39 M5, with no issue…

[repoman89]

Just guessing, I'd say 8.5"et22 WOULD fit without a spacer, but have a 3mm-5mm on hand just in case?

It doesn’t and it’s not even close with RGRs. On that particular wheel the hub mounting area and spokes are all basically the same shape and the different offsets are created by just shifting the barrel and where it mounts to the spokes in and out. As the above poster read somewhere, I did try it with my set that I bought for my M5. I would have bought another set if they fit for sure, the design is perfection IMO.

The only non-rep 18” wheel that I personally like and have found so far that will fit properly without spacers are a custom set of LMs for $10k. Maybe someday but I’m using my ZCPs for now with 18/12mm spacers.

[Tbonem3]

It'll depend partly on the design of the wheel (spokes) not just width/offset. Every wheel is different. I thought for sure I'd be ok with the 9"et30 Arc-8s, but still needed 5mm minimum to clear. My 8.5et29 E90 M3 wheels fit perfectly, however, but I noticed that the spokes on those are quite scalloped or curving out (convex), so it cleared the big 996. The ARC8 spokes are straight, thus they strike the calipers at an offset below et25 it seems.

Just guessing, I'd say 8.5"et22 WOULD fit without a spacer, but have a 3mm-5mm on hand just in case?

[Sprp85]

Any thoughts on 996 BBK clearance with E39-spec'd BBS RG-Rs? I have a set of 996 calipers being prepped but was looking to plan ahead in terms of fitment with the current wheel setup.

• 18x8.5 ET22 Front
• 18x10 ET25 Rear

The general consensus seems to be that it won't clear, and I believe Repoman has already test fitted them and found that it won't clear,

But I was also able to find someone who did get them to work with E46-spec RG-Rs (18x8.5 ET38 Fronts) with a 12mm spacer up front (guessing based on the owner's previous posts):

A 12 mm spacer would effectively make the front specs 18x8.5 ET26.


Thread about the wheels shown above: 18" BBS R-GR's w/Porsche 996 BBK Fitment - NA M3 Forums

[Tbonem3]

Oe is ate I believe. I saw it stamped on the rotors when I installed them with my 996 conversion.

Technically speaking, since Zimmermann supplies parts to BMW (and probably other German brands), they'd be considered OEM. Aftermarket would be a part made by a company that doesn't supply any parts to major brand/factory. OE of course is the actual brand/part that our came with. Ate is oe for the solid discs and calipers and I'm pretty sure the euro semi floating discs as well.

[heinzboehmer]

I always thought that Zimmermann were the OE ZCP rotors.

Same, but FCP labels Zimmermann as aftermarket, so not sure what to make of that.

For what it's worth Zimmermann and VNE are also labeled as aftermarket for the non-ZCP euro rotors. Makes me think they're all the same, just rebranded.

But anyway, SHW is the cheaper than Zimmermann and labeled OE, so I'll likely stick with those.

[duracellttu]

I always thought that Zimmermann were the OE ZCP rotors.

[heinzboehmer]

Yeah that makes sense. I'll shop around, but I'll be using these on track, so the SHW rotors from FCP are tempting.

[Tbonem3]

I think it's like "VNE" and other companies that resell OE parts. ABelectrik makes our TPS, but "VNE" buys them wholesale and resells them. You buy the VNE part on FCPeuro, but you receive an ABE part with the BMW logo ground off (or never imprinted).

These "SHW" rotors are still BMW (ATE?) rotors.

I was about to buy these SHW rotors (for E90 M3), but I ended up getting the same price buying OE bmw from a bmw dealership (husker - bmwdirectparts.com). Might want to cross-shop by part #, but I wouldn't hesitate to buy the SHW from FCP if there is a price difference.

Coincidentally, I received an email from Eeuroparts.com advertising 5% off SHW brake parts (June20-24), so that might be worth looking into - though I don't know what their starting price point is, relative to FCP or any other source.

[heinzboehmer]

Anyone have experience with SHW Performance rotors? FCP says they're OE and made in Germany, but I haven't heard of the brand before. Full set comes out ~$250 cheaper than genuine BMW.

Example: https://www.fcpeuro.com/products/bmw...r-shw-bfr44461

[Arith2]

So, feeling like I'm missing something obvious here.

The OE Porsche pads that came with my calipers are at end of life, so I ordered new one using the PN in this thread (99635294903)-- which I don't think is wrong, as FCP agrees that's a stock 996 front pad.

The pads that came have the same pad shape in the portion that goes into the caliper, but there's an extra bit of flange up top that prevents the anti rattle clip from being used.

... what am I missing? I'm fine with no anti rattle clips on track, but on the street that'll almost certainly be way too annoying.

Porsche did a part update in 2010 or so to their pads and clips for that generation of brakes. My dad and I ran into that issue 7 or so years ago on his Cayman. This is sort of common Porsche knowledge but we are not Porsche owners in general and this is a BMW website. Easy to miss and next thing you know, you're out $30 for no reason.

[Obioban]

So, feeling like I'm missing something obvious here.

The OE Porsche pads that came with my calipers are at end of life, so I ordered new one using the PN in this thread (99635294903)-- which I don't think is wrong, as FCP agrees that's a stock 996 front pad.

The pads that came have the same pad shape in the portion that goes into the caliper, but there's an extra bit of flange up top that prevents the anti rattle clip from being used.

... what am I missing? I'm fine with no anti rattle clips on track, but on the street that'll almost certainly be way too annoying.

Turns out the answer is I need an different version of the anti rattle clip than came with my calipers.

This is what I need: https://www.fcpeuro.com/products/por...11-52843010001

[Obioban]

So, feeling like I'm missing something obvious here.

The OE Porsche pads that came with my calipers are at end of life, so I ordered new one using the PN in this thread (99635294903)-- which I don't think is wrong, as FCP agrees that's a stock 996 front pad.

The pads that came have the same pad shape in the portion that goes into the caliper, but there's an extra bit of flange up top that prevents the anti rattle clip from being used.

... what am I missing? I'm fine with no anti rattle clips on track, but on the street that'll almost certainly be way too annoying.