Fitted bigger disc on the S

[madmodz]

Originally Posted by itsnotanova

I can confirm that the base front calipers will fit on the back of a 996 carrier. It should fit the rear of a 986 S too. I can't say how well it will work though. The front base caliper does have much larger Pistons than the rear S caliper.

The rear base calipers won't fit over the S rotor because of the pins that hold the pads. Maybe if you ground the pins down, the base caliper would fit over the S rotor.

I read somewhere with the base front caliper in rear of an S model you stand the chance of locking up the rear brake first. Is this even possible? I always thought the fronts did most of the work and the brake bias is set that way. I also heard both the s and base use the same size staggered pistons.

[edc]

If you want bigger front discs there is a guy on the UK boxa.net forum that has had some made up with a spacer kit to work with the existing S caliper. The cost premium over an OE disc is negligible.

[JFP in PA]

The front disc rotors and calipers are a simple bolt on and go upgrade on a base 986. No changes to the brake bias or master cylinder is required. The rears are another story as they require major surgery to install.

[madmodz]

Originally Posted by edc

If you want bigger front discs there is a guy on the UK boxa.net forum that has had some made up with a spacer kit to work with the existing S caliper. The cost premium over an OE disc is negligible.

Hey Edc,
I did a search over there but didn't find anything. I ordered the spacers from girodisc so looks like the front is going to happen. Thanks for the link.

Originally Posted by JFP in PA

The front disc rotors and calipers are a simple bolt on and go upgrade on a base 986. No changes to the brake bias or master cylinder is required. The rears are another story as they require major surgery to install.

Thanks JFP,
I was hoping the rear conversion would be easier. Unfortunately I have to do that base to S rear brake conversion. There's a chance I might be able to get the Carrera S rotor to fit the S setup. The girodisc rear setup only fits on the S model, so base owners will have to do the swap if they want bigger rear rotors. I'm going to do a DIY for the readers here since there seems to be no threads on the rear conversion. I couldn't find any info on the rear conversions anywhere, google search and all. If anyone has any info on a rear brake conversions please post link here.

Here are some REAR disc pics. Aftermarket base, S model and a Carrera S 330mm:



There's about a 1/2" difference in the rear ID where the parking brake pads grip against the inner rear wall. The 911 S rotor bolts on both the base and S model.



The Carrera rotor doesn't fit flush on either base or S. Its close but about an 1/8 gap. There is something keeping it from sitting on the face. My guess is the rear lip which I can cut out on a lathe.

Since I had both the base and S rears taken apart, I tried fitting the rear base rotor on the S. It doesn't fit. The S has a wider handbrake setup.

Ok next step is to find any info on the base to S rear conversion. Need parts and info for the DIY writeup.

[JFP in PA]

Because the S cars use different axles and carrier hubs, they also carry the e-brake from the larger cars, which as you observed are larger in diameter. In order to convert the rear of a base Boxster to the S brake set up in a bolt on manner (no weird or unobtainable adaptors), you need the carriers, hubs, and e-brakes off an S car.

[madmodz]

Got my mounting kit from girodisc. 5 bucks per bolt and spacer. Whole kit was 80. I figure the bolts are just 911 bolts. I will make my own kit for now on. I was hoping for a one piece spacer. I could have spun my own spacer on a lathe but don't have a mill to make a one piece spacer.

[edc]

On Boxa.net find user Patt. I think it's a bigger disc with a caliper spacer.

[itsnotanova]

This thread has me thinking about doing my own big brake upgrade. I'm thinking 17z Brembos with 355mm rotors.

[madmodz]

Originally Posted by itsnotanova

This thread has me thinking about doing my own big brake upgrade. I'm thinking 17z Brembos with 355mm rotors.

That would be awesome Woody. I found rotors for about 230 each.
The spacers are five bucks each. I'm more then sure the pins can be pressed in instead of being cut. That's a big brake kit for under 500.