X-drilled & Slotted Rotors CAN be cut!

[Lil bastard]

Well, there's no way to tell if you did not measure the lateral runout or put a micrometer on the disc before you started.

The thickness of an OEM Boxster S disc is:

• front / rear
  28 mm / 24mm

The minimum allowable thickness of an OEM Boxster S disc is:

• front / rear
  26.0 mm / 22.0 mm

But, the OEM discs, while sometimes supplied by Zimmerman to Porsche for the 'S' model, are not the same discs that Zimmerman offers the public as aftermarket discs, so the allowances listed above may not be the same. But, the Zimmerman aftermarket x-drilled & slotted rotors have been reported to crack more readily by several owners who have installed them.

I'd measure your discs now w/ a micrometer and if inside the minimum allowance for the OEM disc, keep an eye on them for cracking, such as when you wash the wheels etc. Replace as soon as you see any cracks between holes forming. If outside the minimum allowance, I'd think about replacing them for safety's sake.

[CJ_Boxster]

Do you have thickness's for NON-S boxster, which is what i have?

[Lil bastard]

Base Boxster OEM non-drilled solid discs new:
front rear
24mm 20 mm

Brake discs Minimum thickness after machining*
front rear
22.6 mm 18.6 mm

* (from Porsche Workshop Manual) The brake disc may be reworked only symmetrically. ie. from both sides evenly - important point - don't just turn one side, take the material evenly from both sides!

Wear Limit
front rear
22.0 mm 18.0 mm

These are the specs for the Base solid discs. But, IMO, you should go by the 'S' specs as these are the ones the Zimmerman aftermarket discs are imitating.

[CJ_Boxster]

Originally Posted by Lil bastard

These are the specs for the Base solid discs. But, IMO, you should go by the 'S' specs as these are the ones the Zimmerman aftermarket discs are imitating.

Ah ok, Well on Thursday ill be at there shop working on there PC so ill have them measure the rotor thickness... OH BTW we did cut both sides evenly. If the outter section needed another 1000th of an inch cut, we cut the inner side another 1000th of an inch.

Ill post my measurements thursday nite.

[SinnerDC2]

slightly off topic, do you have a non-s ? If so how much where the drilled and slotted brakes? Next time I replace my rotors, I'd like to go slotted.

Thanks
Nick

[CJ_Boxster]

Originally Posted by SinnerDC2

slightly off topic, do you have a non-s ? If so how much where the drilled and slotted brakes? Next time I replace my rotors, I'd like to go slotted.

Thanks
Nick

Didn't get a chance to measure rotor thickness but sinner, I paid 310 shipped for front and rear x drilled & slotted Zimmerman rotors from an ebay vendor.

[nola911]

Slightly off topic, but do you mean.. you cut 1/1000 of an inch five times to be the same as 5/1000 of an inch?

1000th of an inch (1/1000) us much larger than 5000th of an inch (1/5000), though in wording they sound the same, in writing they are totally different. If you cut were aiming to cut 1/5000 and you cut 1/1000 once, twice, four , or five times, you cut too much.

Is it obvious that I am at work?