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Forced Induction Forum Sponsored by Active Autowerke
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Old 07-12-2012, 01:33 PM   #1
HPF Chris
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Thumbs Up HPF NEXT GENERATION E46 M3 Clutch Disk PICS

Sound Performance pushed the limits of our Stage 3 clutch with 323tom's S54 Monster running Nitrous and over 800 ft-lbs of torque. The Feramic friction material held, but the hub center section didn't. We have been running a much stronger hub center section on all of our N54 (BMW 135 and 335) clutches and never had the need to upgrade our HPF clutch center sections. That is until now.

Clutches are typically rated by the Torque the motor provides, not by horsepower. We've run over 1,000rwhp on the HPF stage 3 clutches but not over 800 ft-lbs. Now that our customers are achieving over 800 ft-lbs, our NEXT GENERATION HPF E46 M3 Clutches are going to run a "riveted" center section similar to our N54 clutch disk in the image below. All HPF E46 M3 Clutches shipped from now on will be utilizing the NEXT GENERATION center sections.





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Old 07-12-2012, 01:42 PM   #2
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sick!!!
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Old 07-12-2012, 01:45 PM   #3
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Wow. Unless this design was already in progress, that was one of the fastest R&D turn arounds I've ever seen...Extremely impressed!
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Old 07-12-2012, 01:59 PM   #4
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So...you should ship one of these out to S.P. for a first hand test!
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Old 07-12-2012, 02:03 PM   #5
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^^^ This!!! Let's see just how much stronger this new clutch is!
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Old 07-12-2012, 02:16 PM   #6
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So...you should ship one of these out to S.P. for a first hand test!
Agree, lets put this bad boy to some extreme testing
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Old 07-12-2012, 02:26 PM   #7
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See all of those little teeth that engages the pressed in section..... well they are now gone on Toms disc. I think that the rivet idea would certainly fix this issue!
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Old 07-12-2012, 02:56 PM   #8
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This thread is Winning.
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Old 07-12-2012, 02:58 PM   #9
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Hpf Chris called me today and is sending me one of these new clutch disks by tmr can't wait to see the results!
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Old 07-12-2012, 03:05 PM   #10
Sound Performance
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has anyone else broken 1 of these stage 3 clutches before?

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Old 07-12-2012, 03:27 PM   #11
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awesome resolve Chris! In for the SP results on that nitrous monster
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Old 07-12-2012, 03:36 PM   #12
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has anyone else broken 1 of these stage 3 clutches before?

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Nope.

The reason the transition is so quick is because we've been running the rivited center sections in our HPF "Supra" Feramic Clutches and many of those guys are running over 1,000rwhp and 9 second 1/4 mile passes.

Chrisk.
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Old 07-13-2012, 12:21 AM   #13
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That was fast and glad it's been sent to SP to be tested in the real world
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Old 07-15-2012, 02:52 AM   #14
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Very Nice! You guys need to make a performance clutch for the NA S54 guys thats close to OEM Smoothness.
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Last edited by 0-60motorsports; 07-15-2012 at 01:36 PM.
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Old 07-15-2012, 11:27 AM   #15
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Very Nice! You guys need to make a performance clutch for the NA S54 guys thats close to OME Smoothness.
I use to have a stage 1, its pretty much factory feel. but its been awhile.
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Old 07-16-2012, 05:32 PM   #16
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Nice one Chris! I have every confidence this fix will work since its existing tech already in other applications.

What about guys that want to upgrade their stage 3 clutches that have not stripped the gears yet? Can they install a new disc in their existing Stage 3 or do they need a whole new different brand (MC)clutch. 1800 is not a bad deal when starting from scratch but that figure coupled with labor is a fair amount when doing an upgrade!
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Old 07-18-2012, 10:50 AM   #17
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Nice one Chris! I have every confidence this fix will work since its existing tech already in other applications.

What about guys that want to upgrade their stage 3 clutches that have not stripped the gears yet? Can they install a new disc in their existing Stage 3 or do they need a whole new different brand (MC)clutch. 1800 is not a bad deal when starting from scratch but that figure coupled with labor is a fair amount when doing an upgrade!
So far we haven't had one slip unless it's just had too many miles.

One other MAJOR thing to note. the "triangle" removal of the edges of the clutch friction material allow for cleaner shifts. Many of us have complained about not being able to do the 2-3 shift. A lot of this has to do with the weight of the clutch disk. A lighter clutch disk can change rpm quicker allowing cleaner entries into the next gear. We are also able to increase the pressure per square inch by decreasing the surface area without compromising driveability.

Chris.
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Old 07-18-2012, 10:53 AM   #18
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So far we haven't had one slip unless it's just had too many miles.

One other MAJOR thing to note. the "triangle" removal of the edges of the clutch friction material allow for cleaner shifts. Many of us have complained about not being able to do the 2-3 shift. A lot of this has to do with the weight of the clutch disk. A lighter clutch disk can change rpm quicker allowing cleaner entries into the next gear. We are also able to increase the pressure per square inch by decreasing the surface area without compromising driveability.

Chris.
Chris

How would you compare the OEM SMG clutch to the HPF STG 1 revised clutch in terms of smoothness in engagement etc. I want an OEM style feel and not aggressive. Thanks
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Old 07-18-2012, 11:06 AM   #19
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Chris

How would you compare the OEM SMG clutch to the HPF STG 1 revised clutch in terms of smoothness in engagement etc. I want an OEM style feel and not aggressive. Thanks
The engagement is about half the distance of travel and about half as smooth as OEM. It is smoother engaging than any other aftermarket clutch I've ever felt other than direct organic OEM disks.

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Old 07-18-2012, 09:11 PM   #20
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The engagement is about half the distance of travel and about half as smooth as OEM. It is smoother engaging than any other aftermarket clutch I've ever felt other than direct organic OEM disks.

Chris.
Yes, but dont you recommend Stage 2 for ALL HPF SMG applications?

On the other hand, stage 1 feramic would be OK for a Super Charged application less than 500HP? Or is it the torque figure you look at?
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