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Old 03-22-2013, 08:35 AM   #1
RallyMachine
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Default OEM 6MT Clutch Torque Capacity - Definitive Answer

I've found alot of conflicting answers on how much the stock 6 speed clutch can hold.

I'm looking at a 6mt for my 300whp/340wtq Legacy 5mt that I bought with an aftermarket clutch. Since I've never really had clutch slippage issues or an OEM clutch for that matter, it's hard for me to tell if the stock STI clutch will hold the power I'm making

I've heard it can go up to 400tq (wheel or crank?), but I just wanted to get a definitive answer on its capacity, and any rough guestimates on the like of the clutch at this power level.

Thanks!
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Old 03-22-2013, 10:50 AM   #2
FuJi K
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E85 on VF39 pushes it to the limit for holding that torque. However if you put on a puck disc in place of the oem disc, it can hold up to 100lb ft more because of the better friction material of the pucks.
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Old 03-22-2013, 11:50 AM   #3
Tripintaz
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If this is your Daily Driver do not put a puck faced clutch in your car. You will be sorry.
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Old 03-22-2013, 12:20 PM   #4
FuJi K
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Quote:
Originally Posted by Tripintaz
If this is your Daily Driver do not put a puck faced clutch in your car. You will be sorry.
I must be sorry because, i daily drove with oem 6spd pressure plate with a sprung 6 puck. I actually prefer the unsprung discs because less chatter.
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Old 03-22-2013, 01:05 PM   #5
rexworx
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Fuji, I would deff be interested in that combo. I have a oem 6spd/clutch with a act street light flywheel in my forester xt. Drives nice but Ill be close too the limit and may need more capacity when I go corn and turn up the boost soon.

In my wrx with a PPG 5spd swapped too 4.44 final drive I run a ACT 6puck sprung with the standard pressure plate and a ACT street light flywheel.

The 6puck deff has less room for error, but I really like how engagement feels. You deff can get used too it fast but I didnt want a stiffer peddle off the bat as the forester is my DD and I hate rush hour traffic through LI,NYC and NJ.

I may have too check this out next...

Ian,
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Old 03-22-2013, 03:44 PM   #6
atomicfire
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Quote:
Originally Posted by Tripintaz View Post
If this is your Daily Driver do not put a puck faced clutch in your car. You will be sorry.
I must be sorry as well
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Old 03-22-2013, 04:37 PM   #7
Tripintaz
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Quote:
Originally Posted by FuJi K View Post
I must be sorry because, i daily drove with oem 6spd pressure plate with a sprung 6 puck. I actually prefer the unsprung discs because less chatter.
Quote:
Originally Posted by atomicfire View Post
I must be sorry as well

Not everyone DD's race cars like us. Personally a puck clutch isnt so bad to me, but most people are not used to aftermarket clutches and would complain about its engagement being so harsh for DD purposes. If the OP is only going to have 400hp, there are much more friendly options that a puck faced clutch for DD. Just throwing in my worthless opinion.

P.S. I bet neither of you can say that you have never had a time where you were in your cars in rush hour traffic wishing maybe you had a less aggressive clutch.
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Old 03-22-2013, 09:49 PM   #8
FuJi K
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I keep it in gear in rush hour traffic and am not in a rush to get up to the rear bumper of the car in front.
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