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Old 03-02-2015, 02:57 PM   #1
MySubconscious
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Unhappy Need a new clutch for my supercharged 325ci

Hey guys, I have a 2002 325ci, It's time for me to get a new clutch.

Main problem being I have a supercharger so I'm trying to decide which clutch to chose for practicality, fun on the streets, and something that can handle the stress. I don't track my car so that's not anything to worry about but I do street race and launch occasionally. I'm pushing around 280 whp & 300 hp.

I'm deciding between the:
SPEC Clutch Kit - Stage 1

And the
SPEC Clutch Kit - Stage 2+

Both are about the same price & have barely any torque capacity difference.
Heres the specs for each.

Stage 1:
Features an integrally molded carbon kevlar-based, high performance organic lining that offers smooth engagement and excellent life. This lining has an integrally bonded steel backing for strength under high clamp loads and temperatures. The hub is double sprung with spring cover relieves for flexibility and heat treated components for strength and durability. Best for street and many track/off-road applications. Includes new billet non-SAC pressure plate. SB64S Billet steel flywheel weighs 20lbs and requires use of E36 M3 style pressure plate. Torque Capacity: 430 lb-ft.

Stage 2+:
Features a multi-friction disc in a full faced configuration with carbon semi-metallic on one side and Kevlar on the other. Bridging the gap between stage 2 and stage 3, the 2+ offers drivability and engagement quality characteristic of the stage 2, but with a 15-20% higher Torque capacity. The hub is double sprung with spring cover relieves for flexibility and heat treated components for strength and durability. Great for street, drag, autocross, road racing, pulling, rally and drift. Steel flywheel weighs 20lbs ; aluminum flywheel weighs 10lbs. Race bolt kit and flange plate included. Torque Capacity: 446 lb-ft.

At the end of the day, I daily drive the car and will be going to college soon so I want something that's not too ridiculous to drive in traffic. But I also want a lasting clutch because of the supercharger. Also I can't seem to find a flywheel that would be good for me as well. The site says it doesn't include a flywheel but it's a clutch kit so I'm kind of lost.

Last edited by MySubconscious; 03-02-2015 at 03:03 PM.
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Old 03-02-2015, 03:05 PM   #2
Rob43
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Question, What type of S/C do you have ?

1) Twin Screw

2) Centrifugal


What's the mileage on your current flywheel ?


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Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
I Know How To Fix The Rear "Bouncing" Problem On Your Cheap Coilovers Like: Jom RL FK SE & RK.

Last edited by Rob43; 03-02-2015 at 03:07 PM.
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Old 03-02-2015, 03:07 PM   #3
MySubconscious
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Quote:
Originally Posted by Rob43 View Post
Question, What type of S/C do you have ?

1) Twin Screw

2) Centrifugal



Rob43
Active Autowerke supercharger. Centrifugal. It's an older version supercharger by them, I can't even find it online anymore.
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Old 03-02-2015, 03:17 PM   #4
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As you know your centri S/C is Very linear in power delivery, so even when you "launch it" you're still not producing much more power than stock. So if you want perfect feel & perfect drive-ability, by an OE BMW stock clutch kit for it. A stock clutch will easily handle the whp that your linear S/C puts out.



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Quote:
Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
I Know How To Fix The Rear "Bouncing" Problem On Your Cheap Coilovers Like: Jom RL FK SE & RK.
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Old 03-02-2015, 03:26 PM   #5
MySubconscious
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Quote:
Originally Posted by Rob43 View Post
As you know your centri S/C is Very linear in power delivery, so even when you "launch it" you're still not producing much more power than stock. So if you want perfect feel & perfect drive-ability, by an OE BMW stock clutch kit for it. A stock clutch will easily handle the whp that your linear S/C puts out.



Rob43
Would i just need to resurface my flywheel as well?
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Old 03-02-2015, 03:44 PM   #6
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I'd get a valeo single mass flywheel/clutch kit. Screw the crappy dual mass flywheel. If your clutch is shot chances are it's springs are too.
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Old 03-02-2015, 03:50 PM   #7
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Quote:
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I'd get a valeo single mass flywheel/clutch kit. Screw the crappy dual mass flywheel. If your clutch is shot chances are it's springs are too.
And experience with Valeo? Do you like them?
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Old 03-02-2015, 03:55 PM   #8
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Would i just need to resurface my flywheel as well?
That's why I Edited & asked about mileage, the stock OE dual mass F/W can not be resurfaced. So it would be up to you to determine it's condition & wear, then you'd need to make a decision on how you'd want to proceed. What you should do now is price out ALL options so you know where you stand concerning price, if memory serves correct the stock OE dual mass F/W is expensive.


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SUMMIT POINT WV 1:24:229 SCCA
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"Chance Favors The Prepared Mind"

I BUILD SUSPENSIONS (Consult) FROM MILD TO WILD FOR RWD & Xi E46's
Quote:
Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
I Know How To Fix The Rear "Bouncing" Problem On Your Cheap Coilovers Like: Jom RL FK SE & RK.
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Old 03-02-2015, 03:58 PM   #9
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I have 77k miles on the car. I didn't realize you couldn't resurface the flywheel. I was just looking and it is quite expensive. thinking about the valeo single mass flywheel and clutch kit now...
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Old 03-02-2015, 04:01 PM   #10
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I'm not sure if I'd want to take the chance of going through & replacing the clutch to find out that the flywheel in in terrible condition. My main problem is that my car grinds downshifting sometimes and doesn't like to grab full throttle. I can't even really do a burn out well.
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Old 03-02-2015, 04:05 PM   #11
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Quote:
Originally Posted by MySubconscious View Post
I have 77k miles on the car. I didn't realize you couldn't resurface the flywheel. I was just looking and it is quite expensive. thinking about the valeo single mass flywheel and clutch kit now...

At 77K your OE F/W might be in good condition, you'd need to inspect it to determine.

Spec Clutch does not offer a 2002 325Ci/i product for your application.

EDIT: If you could buy the Spec Clutch kit with their steel F/W, the price would be
about $1400 dollars. Start looking into UUC, they run sales often.


Research the meaning "SAC" / "Non SAC" clutch, this Should be a determining factor if you go away from stock OE parts.



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Rob #43 ITS/ITR/STU, BMW 325I, STU LAP RECORD
SUMMIT POINT WV 1:24:229 SCCA
(DynoDynamics https:vimeo.com/8486878 Dyno Video)
"Chance Favors The Prepared Mind"

I BUILD SUSPENSIONS (Consult) FROM MILD TO WILD FOR RWD & Xi E46's
Quote:
Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
I Know How To Fix The Rear "Bouncing" Problem On Your Cheap Coilovers Like: Jom RL FK SE & RK.

Last edited by Rob43; 03-02-2015 at 04:10 PM.
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Old 03-02-2015, 11:51 PM   #12
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Valeo SMF formula to success=arguably a better setup for a sports car+the most affordable=win
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Old 03-03-2015, 10:51 AM   #13
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How will it drive compared to how it does now with the DMF?
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Old 03-03-2015, 11:17 AM   #14
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Need a new clutch for my supercharged 325ci

More linear and stronger engagement. I would remove the clutch delay valve at the same time to make the feel even better. The DMF is made to increase comfort, not ideal for supercharged fun cars. The valeo unit is not a lightweight setup either though so it will be very drivable with no side effects. Unlike most lightweight and upgraded options. It's really what the car should have come with from the factory.
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Last edited by Pole position; 03-03-2015 at 11:18 AM.
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Old 03-03-2015, 11:19 AM   #15
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How would it be with daily use though considering I'm going to college soon.
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Old 03-03-2015, 11:21 AM   #16
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Would be fine, as I said it's not a lightweight setup so it will drive like normal clutch that come from the factory on any sports car these days.
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Old 03-03-2015, 11:22 AM   #17
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Awesome. I'll probably do that. Just not sure of how difficult the install will be.
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Old 03-03-2015, 11:23 AM   #18
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Time consuming and annoying for sure. But better to do it right yourself and save the dough.
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Old 03-03-2015, 05:14 PM   #19
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Quote:
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Awesome. I'll probably do that. Just not sure of how difficult the install will be.
Requires dropping the exhaust and getting the driveshaft out of the way before you can even start working on the transmission bellhousing.

Quote:
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Time consuming and annoying for sure. But better to do it right yourself and save the dough.
This is pretty accurate description. I plan to do this myself and I keep putting it off because I want to set aside a whole weekend in case anything goes wrong and I need to get a loaner for work.
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Old 03-03-2015, 05:20 PM   #20
MySubconscious
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Need a new clutch for my supercharged 325ci

Yeah I know the basic steps. I've just never done it before and wonder about how difficult the conversion to the SMF will be. I've never cracked open a transmission or anything like that before. I've seen its about an 8/10 in difficulty.

Last edited by MySubconscious; 03-03-2015 at 05:52 PM.
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