What's the clamping force of the S4 and RS4 pressure plates? Seems to be conflicting info. SPEC too
03-07-2005, 12:51 PM
#1
AudiWorld Expert
Thread Starter
What's the clamping force of the S4 and RS4 pressure plates? Seems to be conflicting info. SPEC too
Trying to find info for a B5 S4...
<a href="http://awe-tuning.com/pages/shared/part_detail.cfm?PMaI=1&PMoI=4&PEI=6&PP=s4_27t_driv etrain.cfm&PPT=Drivetrain&IL=s4stage2">AWE site</a> makes note of "OEM is 2600". I presume they mean OEM S4?
<a href="https://forums.audiworld.com/s4/msgs/740182.phtml">This post</a> by Tanner says:
"S4 is 1300PSI
RS4 is 1800PSI"
<a href="https://forums.audiworld.com/s4/msgs/1787547.phtml"> X-1 Racer says</a>:
"RS4 pressure plate = S4 pressure x 2"
<a href="https://forums.audiworld.com/s4/msgs/1463079.phtml">This post</a> by ToastyK04s refers to his SPEC Stg 3 clutch and says:
"Mine has a 6-puck disc with a pressure plate that has nearly twice the clamping force of the RS4 setup."
So, what's the clamping force on the SPEC Stage 3? What about the other stages of SPEC clutches?
found this info on SPEC after posting:
<a href="https://forums.audiworld.com/s4/msgs/1204658.phtml"> Jason Leone says</a> :
Stage 1:
Modded pressure plate (100psi over RS4)
Stage 2:
Modded pressure plate (375psi over RS4)
Stage 3:
Modded pressure plate (375psi over RS4)
This conflicts with ToastyK04's comment of Stg3 being about 2x that of RS4.
<a href="http://awe-tuning.com/pages/shared/part_detail.cfm?PMaI=1&PMoI=4&PEI=6&PP=s4_27t_driv etrain.cfm&PPT=Drivetrain&IL=s4stage2">AWE site</a> makes note of "OEM is 2600". I presume they mean OEM S4?
<a href="https://forums.audiworld.com/s4/msgs/740182.phtml">This post</a> by Tanner says:
"S4 is 1300PSI
RS4 is 1800PSI"
<a href="https://forums.audiworld.com/s4/msgs/1787547.phtml"> X-1 Racer says</a>:
"RS4 pressure plate = S4 pressure x 2"
<a href="https://forums.audiworld.com/s4/msgs/1463079.phtml">This post</a> by ToastyK04s refers to his SPEC Stg 3 clutch and says:
"Mine has a 6-puck disc with a pressure plate that has nearly twice the clamping force of the RS4 setup."
So, what's the clamping force on the SPEC Stage 3? What about the other stages of SPEC clutches?
found this info on SPEC after posting:
<a href="https://forums.audiworld.com/s4/msgs/1204658.phtml"> Jason Leone says</a> :
Stage 1:
Modded pressure plate (100psi over RS4)
Stage 2:
Modded pressure plate (375psi over RS4)
Stage 3:
Modded pressure plate (375psi over RS4)
This conflicts with ToastyK04's comment of Stg3 being about 2x that of RS4.
03-08-2005, 05:59 PM
#4
Elder Member
Join Date: Sep 2002
Posts: 14,366
Likes: 0
Received 0 Likes
on
0 Posts
A friend of mine which builds my custom clutchs.
He said the old S4 pressure plate was about 2600 psi while the RS4 pressure plate he tested was 2800 psi. There is no way a stock S4 clutch could be 1300 psi since the stock A4 1.8t is 1450.
03-08-2005, 06:13 PM
#5
AudiWorld Expert
Thread Starter
BTW Mike, I've heard the same - just the pivot bearing is different, and thus why they *feel*
different, yet both have the same clamping force. It is a mystery then as to why it seems the RS4 holds up better to power, if they have the same plate and disk.
interesting nonetheless
interesting nonetheless
03-08-2005, 11:15 PM
#6
Elder Member
Join Date: Sep 2002
Posts: 14,366
Likes: 0
Received 0 Likes
on
0 Posts
Are the disks exactly the same?
Some companies use different material on the disk just to make a clutch setup seem like it can hold more pressure or seem like it has more clamping pressure when it does not. Just a little trick that has been used and is still used by some these days.
Trending Topics
Thread
Thread Starter
Forum
Replies
Last Post
My2ndS4
S4 / RS4 (B5 Platform) Discussion
15
10-26-2006 07:03 PM
Mark P
S4 / RS4 (B5 Platform) Discussion
12
03-09-2005 02:29 PM
hinesy
S4 / RS4 (B5 Platform) Discussion
5
09-29-2002 05:43 PM
fka smurfette
S4 / RS4 (B5 Platform) Discussion
15
07-18-2002 06:37 AM
