front caliper 993 difference
Thread Starter
6th Gear
Joined: Apr 2015
Posts: 6
Likes: 0
front caliper 993 difference
What are differences between:
993 C2/C4 993.351.421.00 and 993 TT (993.351.425.10) front caliper
Are the fixation (bolt position or diameter) different
Can the first one be used on 322X32 disks
Thanks for any reply
Cheers
993 C2/C4 993.351.421.00 and 993 TT (993.351.425.10) front caliper
Are the fixation (bolt position or diameter) different
Can the first one be used on 322X32 disks
Thanks for any reply
Cheers
Addict
Rennlist Member
Rennlist Member
Joined: May 2001
Posts: 12,826
Likes: 787
They both have the same 130mm bolt pattern, mounting face height, the same 132mm pad length and the same 36/44 pistons, The 993RS/tt 'Big Red' pad is taller by ~4mm the pads heights are ~175mm for 993RS and ~171mm for other 993. The 993 uses a 304x32mm rotor the 993RS/tt uses a 322x32mm rotor
Thread Starter
6th Gear
Joined: Apr 2015
Posts: 6
Likes: 0
Hey my friend
Brake questions are you specialty ;-)
What are the performance difference when mounted on a 964. Are we talking about 5% or 50%
Is it worth the money to mount 322 and pay $500 more for the RS caliper.
Can one achieve the 1.43 torque ratio when using the 993 C2/C4 components?
Brake questions are you specialty ;-)
What are the performance difference when mounted on a 964. Are we talking about 5% or 50%
Is it worth the money to mount 322 and pay $500 more for the RS caliper.
Can one achieve the 1.43 torque ratio when using the 993 C2/C4 components?
Addict
Rennlist Member
Rennlist Member
Joined: May 2001
Posts: 12,826
Likes: 787
Hey my friend
Brake questions are you specialty ;-)
What are the performance difference when mounted on a 964. Are we talking about 5% or 50%
Is it worth the money to mount 322 and pay $500 more for the RS caliper.
Can one achieve the 1.43 torque ratio when using the 993 C2/C4 components?
Brake questions are you specialty ;-)
What are the performance difference when mounted on a 964. Are we talking about 5% or 50%
Is it worth the money to mount 322 and pay $500 more for the RS caliper.
Can one achieve the 1.43 torque ratio when using the 993 C2/C4 components?
1) 993 front caliper on 928 S4 304x32mm rotor
2) 993RS big red caliper or 928GTS big black front caliper on 322x32mm rotor
3) 964RS/t black caliper on 322x32mm rotor, an alternate caliper here is 993 front caliper this is the same as was use on 964RS/Cup
Here are the torque bias ratios
1) 1.604
2) 1.659
3) 1.713 the 993 or 964RS caliper develops more brake torque than a 964RS when both use the same 322mm rotor
If it were my car I would remove or gut the p/v w/ any of these setups as they are all a little more front biased than is necessary.
Track Day
Joined: Aug 2014
Posts: 22
Likes: 0
From: Hong Kong
Question, if I have a 964 C2 and upgrade to 993 C2 front caliper, can I retain the stock 964 rear caliper (can this setup be made to work with a different p/v)? If I have to use the 993 C2 rear caliper, what p/v do I need?
Three Wheelin'
Joined: Mar 2010
Posts: 1,256
Likes: 371
From: Chicago suburbs
^^^^ I'm also looking for an answer to that question. If it matters I have a '90 964 with stock brakes but have a full set of '95 993 calipers and rotors (front and rear). I'm wondering how difficult is the conversion to the black 993 calipers and rotors. Thanks.
Addict
Rennlist Member
Rennlist Member
Joined: May 2001
Posts: 12,826
Likes: 787
You can leave the stock p/v or do as the 964 Cups did and remove the p/v entirely. Any of these setups have lots of front bias and don't really need a p/v
Trending Topics
Addict
Rennlist Member
Rennlist Member
Joined: May 2001
Posts: 12,826
Likes: 787
the 993 front calipers just need a caliper adapter and 993 rear calipers are a bolt on w/ stock rotors.
for the front rotor 993 wants 304 x32 rotor, this is the same size rotor as 930s used but you will need a custom hat and annulus. You could use the stock 993 rotors if you also use a 993(or 993RS) wheel carrier, w/ this setup you no longer need a caliper adapter as the 993 calipers bolt directly to the 993 (or 993RS) wheel carrier
Rennlist Stories
The Best Porsche Posts for Porsche Enthusiasts
Porsche's Top 5 Most Questionable Naming Decisions
Verdad Gallardo
Pogea Racing's 964 Porsche 911 Reimagination Stands Out in a Crowded Field
Verdad Gallardo
6 Convertible Top MYTHS Most People Don't Understand!
Michael S. Palmer
2026 Porsche 911 Club Coupe is Spectacular, And Everything Wrong with the Porsche Market
Joe Kucinski
Talos Takes Your 991 Porsche 911 GT3 to the Next Level for a Cool $1.13 Million
Verdad Gallardo
9 Vehicles Porsche Helped Engineer that Aren't Porsches
Verdad Gallardo
9 Features and Characteristics That Only Porsche People Understand
Verdad Gallardo
I've Written 500 Rennlist Articles: Here's How Porsche Has Changed Along the Way
Joe Kucinski
