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Old 04-20-2008, 12:48 PM   #1
Unabomber
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You need to buy clutches based on the amount of torque you are producing or are projected to produce. You are to buy at that level and go no further due to the harsh and aggressive engagement that also adds to driveline shock load which breaks gears and cause severe driveabiltiy issues. Torque levels listed below are at the crank vs. at the wheel. To figure out your crank TQ figure add the dyno's drivetrain losses to your torque level as the dyno operator/your tuner should know that their dyno losses are XX%. Typical dyno losses can be 15-30% depending, but err towards using the exact figures rather than guessing and getting the wrong clutch.

Using this chart in conjunction with the Clutch & Flywheel FAQ, you now should be able to buy a clutch all by yourself. If I missed someone else, please let me know.

Company Name/Part Number/Torque capacity is the format.

WRX 2002-2005

Exedy 15802 278
Gripforce (AKA F1) F1-55013R0-SS 288
Exedy 15950 316
Competition Clutch 15019-2100 317/250*
South Bend Clutch STAGE 1 RALLY 316
Exedy FH01SD 318
Gripforce (AKA F1) F1-55013R1-SS 331
SPEC SU001 340
South Bend Clutch STAGE 2 TZ 345
Gripforce (AKA F1) F1-55013R3-SS 380
Competition Clutch 15019-2300 381/300*
Competition Clutch 15019-1620 395/350*
Competition Clutch 15019-0620 395/350*
Competition Clutch 15019-1420 395/350*
RPS MS-20WRX-ST 400
SPEC SU002 400
Exedy FM012SBMC 426
ACT SB3-HDMM 429
Exedy FM012SD 430
SPEC SU003H 440
South Bend Clutch STAGE 3 OFE 450
Exedy FM012SDMC1 475
RPS MS-20WRX-SP 475
SPEC SU003 485
SPEC SU004 485
SPEC SU003F 540
Exedy FM012HD 535
ACT SB3-HDG6 549
ACT SB3-HDG4 549
ACT SB3-HDR6 549
ACT SB3-HDR4 549
South Bend Clutch STAGE 4 SS OFE 550
Exedy FM013SBMC1 630
SPEC SU005 640
South Bend Clutch STAGE 5 SS FE 650
Exedy FM013HB 880

*Competition Clutches are rated at wheel TQ. Figures listed are: First number is computed crank HP (WTQ rating x 27% for dynojet average loss)/Competition Clutch wheel TQ rating. Figures were computed to place Competition Clutch on level playing field with other manufacturers. This 27% figure cannot be used in any other fashion so don't be cute and try to use it to buy a clutch, it's just to level the field for these charts.

STI 2004-2009

Competition Clutch 15020-2100 317/250*
Exedy FH02SD1 350
SPEC SU301 355
Competition Clutch 15020-2300 381/300*
Competition Clutch 15020-1620 395/350*
SPEC SU302 414
South Bend Clutch STAGE 1 RALLY 425
Exedy FM022SBMC1 426
Exedy FM022SD 430
Gripforce (AKA F1) F1-55015R1-SS 439
South Bend Clutch STAGE 2 TZ 460
SPEC SU303H 465
Exedy FM022SDMC 475
RPS MS-20STI-ST 475
RPS BC1-20STI-ST 475
RPS BC1PK-20STI-ST 475
ACT SB4-HDSS 515
SPEC SU303 525
SPEC SU304 525
South Bend Clutch STAGE 3 OFE 530
Exedy FM022HD 535
Gripforce (AKA F1) F1-55015R3-SS 565
ACT SB4-XTSS 566
RPS MS-20STI-SP 575
RPS BC1-20STI-SP 575
RPS BC1PK-20STI-SP 575
SPEC SU303F 585
Exedy FM022HBL 585
Exedy FM023SBMC1 630
South Bend Clutch STAGE 4 SS OFE 650
ACT SB4-HDR6 659
ACT SB4-HDG4 659
ACT SB4-HDR4 659
Exedy FM023SB 670
SPEC SU305 697
RPS BC2PK-20STI 700
ACT SB4-XTR6 724
ACT SB4-XTG4 724
ACT SB4-XTR4 724
South Bend Cltuch STAGE 4 SS FE 750
Exedy FM023HB 880

*Competition Clutches are rated at wheel TQ. Figures listed are: First number is computed crank TQ (WTQ rating x 27% for dynojet average loss)/Competition Clutch wheel TQ rating. Figures were computed to place Competition Clutch on level playing field with other manufacturers. This 27% figure cannot be used in any other fashion so don't be cute and try to use it to buy a clutch, it's just to level the field for these charts.

WRX 2006-2009

Exedy 15804 287
South Bend Clutch STAGE 1 RALLY 316
Exedy 15952 326
South Bend Clutch STAGE 2 TZ 345
ACT SB5-HDMM 420
South Bend Clutch STAGE 3 OFE 450
ACT SB5-HDG6 537
ACT SB5-HDG4 537
ACT SB5-HDR6 537
ACT SB5-HDR4 537
South Bend Clutch STAGE 4 SS OFE 550
Exedy FM032XD 585
South Bend Clutch STAGE 4 SS FE 650
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Last edited by Unabomber; 02-26-2010 at 11:25 AM.
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Old 04-20-2008, 12:50 PM   #2
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It took about three years, but I FINALLY found TQ ratings for Exedy clutches. Since they are one of the top two manufacturers I felt it was unfair to make a post like this three years ago.

And if anyone knows if the 08 WRX and/or 08 STI have the same clutches as the 07s, please chime in.
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Old 04-20-2008, 01:20 PM   #3
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Which one is the OEM clutch ??
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Old 04-20-2008, 01:29 PM   #4
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None of them are OEM. This isn't about OEM, it's about aftermarket.
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Old 04-20-2008, 03:05 PM   #5
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Exedy 15803 321

this would mean that the Exedy stage 1 organic clutch is only good for 321 wheel torque, or flywheel torque?

The reason I ask is because I have the SPT stage 1 clutch (Made by Exedy) in my car right now and have more wtq/whp than 321 running an APS SR56 turbo... I don't think I understand this convention...

Last edited by rhinotech; 04-20-2008 at 03:13 PM.
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Old 04-20-2008, 03:10 PM   #6
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^
I'm curious to this as well
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Old 04-20-2008, 04:10 PM   #7
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There is no SPT stage one according to http://www.subaru.com/microsites/spt...select.sptmain. If in fact Exedy does make the SPT clutches (from the pictures it sure looks like it), since they have no torque rating on the SPT site, we will never know. It's also possible that if they are Exedy, they are special SPT versions with higher torque holding capability than the normal Exedy "stage whatever" clutch.

How much torque they hold is generally for power to the ground vs. at the motor.
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Old 04-20-2008, 04:18 PM   #8
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Yet another useful thread by the Unabomber. Thanks!!!
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Old 04-20-2008, 05:39 PM   #9
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Jesus man, I don't know how the F you found the torque ratings on Exedy clutches. All I could ever find were clamp loads which wer absolutely meaningless to me

Thanks a ton.
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Old 04-20-2008, 05:47 PM   #10
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I got skillz y0!

http://group5motorsport.com/exedy-clutch/b-10070.aspx

I was goofing off this morning and stumbled on their site. Oddly enough, I've been there several times, they are just around the corner from Kartboy in San Diego. I know what you mean as I've been searching for TQ numbers from them forever. Exedy apparently doesn't do email, so I'm glad someone had the numbers listed.
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Old 04-21-2008, 09:37 AM   #11
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any good information on Exedy OEM Replacement Clutch Kit. The price is very good only about $200.
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Old 04-21-2008, 02:45 PM   #12
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Any idea which of these are crank and which are wheel torque ratings?
I believe most are crank, but I know those Exedy ratings are way too low for that to be the case, unless they're incredibly conservative. I mean the stock clutch can hold more than what the Exedy stage 2 3 puck cerametallic is rated at...just doesn't make sense.
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Old 04-21-2008, 02:56 PM   #13
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I believe Fidanza makes some clutches too-

http://www.maperformance.com/store/home.php?cat=448

I couldn't find any torque ratings. I am interested because I have a Fidanza flywheel which I like a lot.
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Old 04-21-2008, 03:12 PM   #14
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oh yah-

nice job


Thanks!
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Old 04-21-2008, 06:11 PM   #15
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Quote:
Originally Posted by rhinotech View Post
Exedy 15803 321

this would mean that the Exedy stage 1 organic clutch is only good for 321 wheel torque, or flywheel torque?

The reason I ask is because I have the SPT stage 1 clutch (Made by Exedy) in my car right now and have more wtq/whp than 321 running an APS SR56 turbo... I don't think I understand this convention...
flywheel
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Old 04-21-2008, 10:33 PM   #16
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Why is this not sticky??
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Old 04-21-2008, 11:30 PM   #17
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Default clutches

real good info

Last edited by twonb1; 04-21-2008 at 11:35 PM.
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Old 04-23-2008, 07:57 PM   #18
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Great info,... instant sticky IMHO
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Old 04-23-2008, 11:21 PM   #19
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This would've helpfull before I bought mine. Anyhow I just bout a ACT SB3-HDMM. I dont know if it goes by engine size or what transmission you have. I'm currently in the process of my hybrid build, have a 2.5l STI block but keeping the stock 02 Wrx Tranny (for now) and will be pushing no more than 410 tq. Did I get the right one or was I suppose to go with the ACT SB4-HDSS,as far as fitment goes?
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Old 04-25-2008, 05:52 PM   #20
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Quote:
Originally Posted by GHK View Post
any good information on Exedy OEM Replacement Clutch Kit. The price is very good only about $200.
thats only the disc, you still need pressure plate, throw out bearing, and pilot bearing.
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Old 04-26-2008, 09:43 AM   #21
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Quote:
Originally Posted by IH8PVMNT View Post
thats only the disc, you still need pressure plate, throw out bearing, and pilot bearing.
really? but it says "kit" which means i assume all are included.
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Old 04-26-2008, 10:57 AM   #22
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Quote:
Originally Posted by GHK View Post
really? but it says "kit" which means i assume all are included.
when you buy flywheel it normally comes with the pilot bearing

when you buy a clutch it normally comes with the pressure plate and throwout bearing

hope this clears things up
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Old 11-01-2008, 04:11 PM   #23
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So I'm Just curious about the exedy 15950. On Vividracing.com the list the Torque Capacity Increase of 87%. Say a stock subie at 220 torque wouldn't that mean that the clutch could hold something like 411 torques?

Correct me if I'm. Or just call me stupid or something.
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Old 11-07-2008, 12:11 AM   #24
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curious weather or not you know anything on the torque rating for centerforce dual frictions? i've heard it's an excellent clutch for driveablity and performance.
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Old 11-07-2008, 07:03 AM   #25
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I wish, but CF doesn't like TQ nor do many other clutch manufacturers....it's like they want us to purposely buy the wrong clutch. So to those manufacturers, I say screw them.
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