310mm front discs with early boxster calipers?

[-Alex-]

I'v been studying and no, according to the numbers, kerscher brake kit has non-s boxster front calipers, which are originally used with 299x24 rotors.

Rears on early non-s boxster are 292x20, and use different caliper at the rear

Also found that watercooled audi/vw guys use this caliper up to 312mm discs from A8/TT. So 310mm rotors should not be a problem.

[evilC]

You will probably have to use at least 17" rims to clear the calipers on a 310/312mm disc.

[dub_crazee]

lol you;re right - i didnt remember correctly!

i jst checked my emails from when i spoke to them and it is indeed a front caliper designed for the 24mm thick porsche disc but used on a 20 mm thick vented disc for a bug!

i'l shut up now

[-Alex-]

Yes i think that i may need 17" rims. I have a 15" 944 space saver alu for spare that fits with 944 Turbo rearbrakes what i have now at the back (299 rotors, 4-piston brembos).


I was hoping to use the space saver on the all around if needed in emergency. But probably it wont fit anymore with 310mm rotors and boxster calipers, but maybe with 20-40mm spacer?


Allthought Kerscher said that their brake kit with 278 rotors and boxster calipers its possible to use any 15" beetle wheel. With 310 rotors, caliper will be pushed out 16mm.

So, there is two choices, if spare wheel doesnt with: 1. 20-40mm wide spacer 2. Smaller rotor (300-304mm)

[-Alex-]

Here seems that with 312 rotor you can fit 16" wheel.

http://www.034motorsport.com/chassis...r-p-13272.html



Does anyone have 16" porsche/audi rim that can measure area where caliper is? I'll check the space saver rim, it should be a littlebit slimmer from inside than regular 15" wheel.

[evilC]

Alex,
I would be concerned that the space saver rim is up to the job of full time duty. It was speed limited IIRC, that maybe related to the variation of wheels and tyres when used but I doubt whether Porsche will sanction it for full duty all round.

The 312mm disc will fit within the largest diameter of a 16" wheel with 37mm clearance for the caliper - thats seems a bit tight for a Brembo unit. Normally, the caliper sits closer to the nave of the wheel that is further narrowed by the rim well (~ 15mm) I had this problem when fitting the 928S4 caliper to the standard 15" wheel. It was correctly set for 944 N/A disc but fouled the wheel. Shaving the caliper didn't work well enough so I had to add spacers that are currentlyt 31mm, that meant wide wings and an increase in the front track to compensate for the rear track width etc etc etc.......

Clive

[-Alex-]

Clive, i will use it only at emergency, thats for i bought it. Also planning to use regular (skinny) tire on that space saver rim.


Wheels for everyday use will be 17" cup wheels. I have 3cm wider front fenders and 6cm wider rears.

Another possibility is to buy 996 or boxster spare tire, it is probably 16" or 17"