Boxster calipers ????which rotors?????

[Yellowbird RS]

After a lot of search I couldn't find which rotors I need
using Boxster calipers on my 74 Carrera.

[VincentVega]

84-89 Carrera

[Vipergrün]

You'll also need the adapters to bolt them up to your struts, if you have not got them.

[pcar fanatic]

hi,

i run the same setup on my SC. I'd advise going for the cross drilled version of the 84-89 rotor since the heat input to the rotors are substantially higher when using boxster calipers. Also watch out for an imbalance in bias between front and rear if you plan on running standard caliper on the rear ... fronts are prone to locking up very quickly

happy braking

pcar fanatic

[Bill Verburg]

I agree w/ most of the above. The calipers won't get you much of a performance increase, about the same as using Carrera brakes which is a much cheaper proposition.

If you use the Boxster fronts on Carrera rotors, drilling will make any heat issues worse

If you use the Boxster fronts then you need either Boxster rears or Carrera rears for balance.

[Yellowbird RS]

I have the 4 calipers (front and rears) from my Boxter S, so I will use them all around, the adaptors are in UPS alrady.

Ok so I need carrera rotors front and rears (drilled)????? yes, no on front only.

Do I need to change the master c...????

[Bill Verburg]

Boxster S calipers are not the same as Boxster calipers, they will want a thicker 28mm rotor, this is a problem. You could try the 944 rotor like VCI uses on their 963 kit or try to widen the throat to accomodate a 32mm 930 rotor.

[pcar fanatic]

hi bill,

you mention that drilled versions will make the problem worse. is this because reduction of surface area due to drilling does not outweigh increased heat dissapation through the holes?

regards
pcar fanatic

[IROC]

Originally posted by pcar fanatic
hi bill,

you mention that drilled versions will make the problem worse. is this because reduction of surface area due to drilling does not outweigh increased heat dissapation through the holes?

regards
pcar fanatic

It's probably because drilling the rotors removes material which in turn reduces the "thermal mass" of the rotors. In other words, they can't absorb and then dissipate as much energy (heat) during braking.

Mike

[dickster]

as a matter of interest there is a write up on fitting boxter calipers in the feb 911 & PW (i only bought it for the 930 article).

it says the 3.2 and 2.7 calipers will not go under 15" wheels!?? WTF have i got under my 15's then!??

[Glasgow 911SC]

Originally posted by dickster
it says the 3.2 and 2.7 calipers will not go under 15" wheels!?? WTF have i got under my 15's then!??

I think it's refering to the 2.7 & 3.2 Boxsters.

[Bill Verburg]

you mention that drilled versions will make the problem worse. is this because reduction of surface area due to drilling does not outweigh increased heat dissapation through the holes?

yes, and the fact that those rotors were never designed to be drilled and the fact that they are small(mass) to begin w/ unless you have a near 2k# car.

The wheels they fit under is highly dependant on the rotors used.

[dickster]

I think it's refering to the 2.7 & 3.2 Boxsters

oh ok, thanks, dooh! can you tell i'm not a boxter fan?

[Yellowbird RS]

So the best thing to do is sell them and get a 964/944turbo calipers, ........RIGHT?!

Hey! Bill, can you tell me the correct spacers to fit Boxster S wheels in my car they are 17"x7 front et 55 and 17"x8.5 et48 rear.
Thanks!

[Bill Verburg]

So the best thing to do is sell them and get a 964/944turbo calipers, ........RIGHT?!

No, a Brembo kit is best, but Steve Timmins may be working on something that may help you w/ the brakes.

front spacers will want to be ~30 - 32mm, rear ~13 - 16mm

[Yellowbird RS]

Bill.
So my new ET going to be 55mm-(30-32)=25-23mm front
and 48mm-(13-16)= 35-32mm rear
It}s that right?
Thanks.

[Bill Verburg]

48mm-(13-16)= 35-32mm rear

Sorry, I wrote that backward , the rear should be 32 - 35mm spacer for an o/s of 13- 16