Correct - Big Reds (and apparently Big Greens) require 17" wheels for clearance. 993 brakes, OTOH, can use stock 16" wheels with a thin spacer in front. No fitment issues in the rear with 16" wheels and 993 brakes.

 

This is the VCI setup I have been running since '99 without any problems with the stock MC and the bias valve completely removing in my RS America:

Front: 993 Twin Turbo "Red" with 12.75"x1.25" (324x32mm) floating VCI rotors. ( I just went to a 13" rotor for next season)

Rear: VCI narrowed C-2 Turbo rear calipers RED 965 352 421 /422 12 w/ Cross-drilled 968 sport rotors.

Pads: Pagid RS14 Black

http://www.vehiclecraft.com/Brakes/vciweb7.htm

 

Adrian,

With three 'why's, don't keep us in suspense....do tell.

 

The 993 RS is #5 on my list, it is a medium caliper not the small as used on the 965 rear(#9)

A narrowed 965r (#9) is the same as a 993r(#8), just buy the correct 993r and be done w/ it. Leave the 965 for the 911 guys to use on their rear axles.

They can be painted w/ powder coat, the common commercial kits, or chemical resistant epoxys

 

Bill V - do you have the part number for the correct 993r (#8 as referred to in your previous post?)

Am I correct in thinking that front rotors from a 993 big red installation will not fit in a 964 - I've been told different things.

 

No they won't fit. You'll need the 964 turbo front rotors.

 

Bill G.-

Looking at Bill's 3 questions above:

The 964 Carrera 2 has the same size brake master cylinder as the 911SC yet it has a 140cc larger brake fluid reservoir, why?
The 911 Turbos have a larger master cylinder as compared to the 911SC but the same size fluid reservoir. Why?
The 964 Carrera RS has a larger master cylinder than the Turbos, Turbo looks and the C4s. Why?

I don't think there is much relationship between the size of the master cylinder reservoir and the actual function of the brake system, the fluid level does not go up and down with brake application.

The difference in the size of the piston goes to the hydraulic ratio the designer was trying to design into the system. The area of the master cylinder piston divided into the area of the caliper pistons=the system ratio. The larger this number is (relatively smaller master cylinder piston and large caliper pistons) the lower the pedal force (softer pedal force) required to achieve a given brake torque-and the harder it is to modulate the brakes at the tire traction limit.

In the 964 Carrera RS, the ratio was made lower with a larger master cylinder piston so a harder force, easier to modulate pedal was achieved, something that might not go over well in a less performance oriented market or particularly a female market.

 

Actually if one is to use Big Red calipers on the front of a 964, you need to use the 965 3.6 Turbo disc, the 965 3.3 Turbo disc has a contact annulus that is 10 mm too narrow for the Big Red pad.

The S4 pad of the 3.3 Turbo is the same length and general shape as the Big Red, but 10 mm narrower.

 

Your correct Cupcar, I meant the 3.6 Turbo....

 

993 352 421 00 caliper w/o pad/black

As Cupcar stated the Big Red caliper is 10mm taller than the 993/S4 though hyraulicaly identical(Cupcar described it as "narrower") and so needs rotor wich is bigger in diameter than the shorter 993/S4 caliper. The usual is 322mm but it can be cheated down a little.

The point is when buying a kit in North America the "Race Technologies" kit cannot be beat, they are the NA arm of Brembo. I believe that is the kit being purchased by TomW. The kit comes complete w/ Big Red front calipers & adapter, floating 322x32mm rotors w/ custom hat for each application, the rear 964 rear kit will have the midsize rear 993/S4 caliper as pictures in my previous post, machined to radial mount w/ the correct adaptor for a 964 rear axle, and 312x28mm rotors. It is pretty much a straight bolt on w/ no running around scrounging for parts.

 

Bill.

Many thanks for your answer and the p/n - do you know which 993 that comes off - did they change with Model Year or C2/C4?

Also does the 993r (#8) require machining and an adaptor to fit a 964 rear axle? If it does is that why folks buy and narrow a 965turbo part?

Finally, do you need to change the rear rotors? - I thought the advantage was that you could stick to the standard 299x24 size and retain the parking brake functionality?

Again, many thanks for your help.

 

Ruairidh,

As Bill points out, when you buy the kit from Brembo, they provide a bolt-on solution that retains all the functionality and addresses all the issues raised above. The rear kit allows use (and provides) a ventilated ('drilled') rotor for greater/faster heat reduction than the stock solid rotor. I retain all parking brake functionality. I wanted to change the rear rotors, not retain them.

I'm interested in seeing what the rotor hats look like for this kit as the stock rear hats on a 964 are massive compared to the 993 hats. I'm also curious if they are aluminum or not. Bob should have them tonight, so I may get to take a peek when I pick up my new seats.

 

I put the Race Technology Big Red kit on the front of my RSA. My buddy Cary Eisenlohr (of ERP) put them on for me- a true bolt on kit. Once I get the courage to use my credit card again I'll spring for the Race Technology Rear kit. I've read all of the pros and cons of switching to these bigger brakes, but I know a lot the fast guys at the track run them and that's good enough for me...

Kenny Tse
93 RSA Daily Driver

 

No, it's a straight bolt on w/ the stock or 951 sport rotor. Those pistons are sized to match 993 front calipers.