Quick question regarding the 3.3 vs 3.6 turbo
02-20-2007, 09:10 PM
#2
Racer
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The 3.6 came with the big calipers, commonly refered to as "big reds", but there was a factory option to have them painted black.
I think the actual rotors may be the same, but not sure. Someone else will come along to confirm soon.
I think the actual rotors may be the same, but not sure. Someone else will come along to confirm soon.
02-20-2007, 09:19 PM
#3
Nordschleife Master
The rears of the 91-91 and th 94s are exactly the same, save for the red color. The fronts of the 3.6T are a different. The caliper pistons are actually are the same sizes, but the 3.6T version uses a slightly larger pad. The front rotors are the same diameter, but the 3.6T ones are thicker.
02-20-2007, 09:22 PM
#4
Three Wheelin'
Thread Starter
Ok, so the 3.6 had the big reds up front, were the rears same as the 3.3, or did the 3.6 also had bigger rear's? what about proportioning valve, were these different??
02-22-2007, 12:01 PM
#6
Rennlist Member
As stated the 94 turbo was the first 911 to use the "Big Reds" Although the 92 GTS first used these calipers in black.
The 91-92 turbo used what were called the Medium S4 brakes taken from the 928 S4. They used a 48 x 132mm pad and a 322 x 32 mm rotor with 44/36 pistons.
The 94 turbo used the big red brakes which increased pad size by 52cm squared up to 302 cm sq from 250cm sq. Pad size was increased to 58mm x 132mm however piston sizes remained the same. Although the rotors used on the 94 were 322x32 mm they are different with more surface area to accommodate the larger pad. Therefore the 94 rotors can be used on a 91-92 but not the reverse. The 94 rotor also had an additional vein in the casting facilitating better cooling.
The rear brakes are identical using a smaller pad that measures 44 x 98 mm and a smaller 299x28mm rotor, unlike the 993TT brakes which use an axially mounted version of the medium S4 calipers in the rear with a 322 x28 mm rear rotor and much smaller 28/28 mm pistons vs the 964 turbos 34/30 mm pistons.
Both brake systems use the 23.81 mm master cylinder vs the 25.4 mm MC of the 993TT system
The 91-92 turbo used what were called the Medium S4 brakes taken from the 928 S4. They used a 48 x 132mm pad and a 322 x 32 mm rotor with 44/36 pistons.
The 94 turbo used the big red brakes which increased pad size by 52cm squared up to 302 cm sq from 250cm sq. Pad size was increased to 58mm x 132mm however piston sizes remained the same. Although the rotors used on the 94 were 322x32 mm they are different with more surface area to accommodate the larger pad. Therefore the 94 rotors can be used on a 91-92 but not the reverse. The 94 rotor also had an additional vein in the casting facilitating better cooling.
The rear brakes are identical using a smaller pad that measures 44 x 98 mm and a smaller 299x28mm rotor, unlike the 993TT brakes which use an axially mounted version of the medium S4 calipers in the rear with a 322 x28 mm rear rotor and much smaller 28/28 mm pistons vs the 964 turbos 34/30 mm pistons.
Both brake systems use the 23.81 mm master cylinder vs the 25.4 mm MC of the 993TT system
02-22-2007, 12:07 PM
#7
Rennlist Member
One more bit of info is the 993 C2 used a similar brake system to the 91-92 turbo. The front calipers were considered medium S4's using the same sized pad and pistons but smaller 304 x32mm rotors. This casting differs from the one used on the 964 turbo. The rears also were similar using a 299 x 24 mm rotor and smaller 30 x 28 mm piston size but same sized pad.
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02-22-2007, 11:10 PM
#10
Addict
Rennlist Member
Rennlist Member
The 993TT front caliper and rotor will fit on the 91-92 Turbo so I assume it will fit on the '94. The rear will not fit w/o modification and loss of the parking brake. The 964 RS rear will fit on the 964 Turbo, though I think the pad area is identical to the turbo.
02-22-2007, 11:26 PM
#11
Nordschleife Master
Originally Posted by JBH
The 993TT front caliper and rotor will fit on the 91-92 Turbo so I assume it will fit on the '94. The rear will not fit w/o modification and loss of the parking brake. The 964 RS rear will fit on the 964 Turbo, though I think the pad area is identical to the turbo.
02-23-2007, 11:05 AM
#12
Rennlist Member
Through the powers of rennlist. The info is all here just need to know where to look. 
The 993TT and 94 turbo front calipers are the same part number. Although the rotors and offsets used are different due to different front spindles.
The 964RS used a similar set up to the 91-92 turbo. Medium S4's up front and the same sized rear pads and pistons. From what I gather the 993 and 964 RS used the same rear calipers and rotors but I might be wrong. The differences in the RS vs the turbo is the RS uses a larger dia 25.4 mm master cylinder vs the turbos 23.81 mm and the proportioning valve reduction is 55 bar vs 60 of the turbo and 40 of the 993 na. MC stroke also varies.
Also from what I hear you are better off going with the 993RS rear brakes than
the 993TT rears. They both use the larger medium S4 rear calipers but the RS's use the larger 36/30 pistons vs the 28/28 mm pistons of the turbo, although I hear the calipers are very expensive and hard to come by.
Regarding fitting 996TT brakes to our cars I can't help you. I do know they are not a bolt on and require expensive modifications. From those that I have heard from, it makes more sense to step up to the Brembo 8 piston calipers than spend the money on the 996TT brakes.
The 993TT and 94 turbo front calipers are the same part number. Although the rotors and offsets used are different due to different front spindles.
The 964RS used a similar set up to the 91-92 turbo. Medium S4's up front and the same sized rear pads and pistons. From what I gather the 993 and 964 RS used the same rear calipers and rotors but I might be wrong. The differences in the RS vs the turbo is the RS uses a larger dia 25.4 mm master cylinder vs the turbos 23.81 mm and the proportioning valve reduction is 55 bar vs 60 of the turbo and 40 of the 993 na. MC stroke also varies.
Also from what I hear you are better off going with the 993RS rear brakes than
the 993TT rears. They both use the larger medium S4 rear calipers but the RS's use the larger 36/30 pistons vs the 28/28 mm pistons of the turbo, although I hear the calipers are very expensive and hard to come by.
Regarding fitting 996TT brakes to our cars I can't help you. I do know they are not a bolt on and require expensive modifications. From those that I have heard from, it makes more sense to step up to the Brembo 8 piston calipers than spend the money on the 996TT brakes.
02-23-2007, 02:32 PM
#14
Rennlist Member
Originally Posted by Turbohead
Does the 964 RS master cylinder designed for the electric hydraulic booster or does just work with the vacuum set up?
Elliot
Elliot
The info I have is the 964 RS uses the electric Hydraulic booster. By this time I believe only the 964 C2's and RSA still used the 8" vacuum setup.