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Old 01-02-2007, 11:22 PM   #1
legacy2003
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Default act or exedy clutch for this setup?

i have a jdm v7 sti motor, fmic, and currently using a standard 16g turbo (yes, pretty mismatched). i was using a stock sti ra clutch... i have a jdm 5 speed v3 wrx (my97) tranny, and the stock clutch let go. it's dead, and i'm making about 300whp. now, i plan to either change turbos to either a vf22 or an 18g so i have a better matched turbo for my motor (the motor flows more than the 16g does!!!).

however, i need a clutch. i have been tossed up between the act organic and the exedy stage 1 or stage 2.

what i can tell you is that i used to use the rs tranny with this motor w/an act clutch, and blew two of those. i'm not sure if it was so much from shifting or the power.

i'm a little hesitant on using another act, even though i really like them.

what would you do? i know this tranny is stronger than a usdm wrx and definately stronger than an rs tranny.

i need something that will hold about 330whp and not have to worry so much about breaking anything.

is the act my best bet since i know it will hold the power, or is this power level really pushing the limits of the exedy clutch?
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Old 01-02-2007, 11:41 PM   #2
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ACT street disc
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Old 01-03-2007, 12:30 PM   #3
legacy2003
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bump for more opinions... i'd like to order a clutch today
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Old 01-03-2007, 04:47 PM   #4
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bump?
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Old 01-03-2007, 04:54 PM   #5
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I run a ACT, and will never go with anyone else. Sprung hub 6 puck FTW!
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Old 01-03-2007, 05:03 PM   #6
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Quote:
Originally Posted by mxboy15u View Post
I run a ACT, and will never go with anyone else. Sprung hub 6 puck FTW!
are you running a stock gearset? are you using a 5 speed? how long have you been using this clutch?
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Old 01-03-2007, 05:48 PM   #7
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how much can an exedy stg 1 hold?

i have searched and searched and searched, and i cannot for the life of me find a ft/lb number for when these clutches start really letting go.

i know it holds 27% more than a stock wrx clutch, but what ft/lb or whp numbers are we talking here?

would it be good enough to hold my v7 w/18g and last a while?
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Old 01-03-2007, 06:53 PM   #8
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Did you read the Clutch FAQ? You need to buy one based on your TQ output and that's it. Just pick on that is the SMALLEST amount over what your TQ is. Then research those clutch brand names and buy the darned thing. Clutches are terribly simple....don't overthink them and spend OMGBBQ$$$$ on a Carbon/Carbon race clutch when all you probably need is another ACT street/strip. Switching to another manufacturer's "stage 1" clutch will probably net you the same or worse results so follow your heart.
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Old 01-03-2007, 07:04 PM   #9
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Quote:
Originally Posted by Unabomber View Post
Did you read the Clutch FAQ? You need to buy one based on your TQ output and that's it. Just pick on that is the SMALLEST amount over what your TQ is. Then research those clutch brand names and buy the darned thing. Clutches are terribly simple....don't overthink them and spend OMGBBQ$$$$ on a Carbon/Carbon race clutch when all you probably need is another ACT street/strip. Switching to another manufacturer's "stage 1" clutch will probably net you the same or worse results so follow your heart.
i have. i actually read it about 5 times in the past 2 days. and i've searched nasioc to DEATH. i just spent at least 2 1/2 hours just now researching other people's setups, and everything seems to vary.

i know regardless i will be going with an organic disc setup. no pucks, no weird disc materials, nothing like that.

the problem is i'm tossed between exedy and act. i know they are both good. however, i know the act is more aggressive than the exedy (from my own experiences), and if the exedy can hold the torque i'm making and will be making (like i said, v7 w/18g... let's say 330wtq?) i will certainly buy the exedy if it will work out for me and still last a reasonable amount of time.

the issue with the exedy is i can't seem to find specific torque numbers where the stage 1 exedy starts to let go. i know it handles 27% over stock, but it seems so varied with driving style as to where the stock one starts slipping. i'm looking for actual power figures, not percentages, know what i mean? all i see is variances between 250-300 on a stocker, and that is quite a variation.

if the exedy won't hold, then i'm stuck with the act. and, frankly, i'm scared of act's. i know the act will hold the power, but i don't want something as aggressive as an act. i don't have a glass-geared 02 wrx tranny, i do have an old school jdm tranny which is supposedly stronger, but i know even *it* has its limits as far as drivetrain shock is concerned.

i want to buy the least aggressive clutch that will hold my setup to prolong the life of my transmission.

and i need to buy it tonight because it needs to go in early next week.

so any wisdom you unabomber or anyone else can shed on this predicament of mine would be very helpful

Last edited by legacy2003; 01-03-2007 at 07:25 PM.
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Old 01-03-2007, 08:20 PM   #10
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You think the ACT street/strip is aggressive? Wow...my opinion is the 100% polar opposite. I have that clutch right now and other than the more firm pedal pressure, I think it's engagement is BETTER than OEM. More like the clutch on an econobox Toyota.

Let me do some l33t h4x0r searching for you on Exedy figures and post back.
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Old 01-03-2007, 08:34 PM   #11
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thank you unabomber! i know you're l33t search skills are much more l33t than mine. i tried, i just can't come up with anything.

it's not that the engagement is rough, i actually liked the engagement of my previous act's, but from what i've felt and noticed while using one, if you're not REALLY careful with one, bad stuff happens. maybe it was because i used to use rs trannies with this setup and i was just pushing too much power for the gears to handle. either instance (buddy broke first tranny, i broke the second one on my car), second gear went from shifting too hard. the odd thing about when "i" broke the second one, was that i was already in gear i'm pretty sure, and second gear just shredded itself when i hammered the throttle.

granted, i know this can happen with *any* clutch especially when pushing a lot of power through an inferior drivetrain, but from what i've understood, a less grippy clutch with less pressure plate force is going to be a little more kind to the gears.

that's why i'm looking at exedy because i know the pressure plate has slightly less clamping force than the act does, and, just like you said, i want "pick one that is the SMALLEST amount over what your TQ is". i just want to make sure an exedy would hold up... if not, act it is. to put it another way, i'd rather replace clutches every now and then instead of trannies!
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Old 01-03-2007, 09:10 PM   #12
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Your thought process tis true! FWIW, most gear box explosions occur at speed like yours did and when people are on their way into church or other place where they are honestly babying their car. Shock load kills gears and I've seen more than one person post that their box grenaded while in second gear pulling into a gas station at 12 MPH. Once your gears reach the X limit, it can just take one more application of power (however slight) to send them to the bottom of your tranny pan.

Here are my conclusions after searching the end of the internet for you:

http://www.exedyusa.com/multimedia/s...ndamentals.pdf

Page 23 of this document states K (safety factor)=clutch torque capacity/engine torque capacity. K should be 1.2 nominally which is the advice I've parroted here. Nice of them to give this information, yet leave the consumer uninformed to the clutch torque rating. They also give a crazy formula for determining a clutch's torque rating, but fail to mention any of the values so that we could do it ourselves. Nice kill Exedy!

Soooooooo aside from that techno babble document, I went to 900 Exedy, Exedy Vendor, Daiken, and Daiken Vendor websites and they all spout the same crap about XX%. Now you can find plenty of data on their OMFGBBQ triple plate clutches as they all seem to list exact torque figures, but nothing for thier stage one. So you are stuck chuck!

(800) 346-6091 CAll them and ask them is all you can do. While you are on the phone, tell them that http://www.daikinclutchusaweb.com/Te...nformation.htm sucks monkey butt.

Two websites that took me all of 8 seconds to find the data needed to make an intelligent clutch decision. You already know about ACT, maybe give SPEC a try? Subie Gal loves her some SPEC, I love Subie Gal, therefore I love SPEC too.

http://www.specclutch.com/
http://www.advancedclutch.com/

Best of luck buddy and if you get a straight friggen answer from Exedy, please update this thread and PM me so I'm sure to read it.

Ron
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Old 01-03-2007, 09:54 PM   #13
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Quote:
Originally Posted by Unabomber View Post
Your thought process tis true! FWIW, most gear box explosions occur at speed like yours did and when people are on their way into church or other place where they are honestly babying their car. Shock load kills gears and I've seen more than one person post that their box grenaded while in second gear pulling into a gas station at 12 MPH. Once your gears reach the X limit, it can just take one more application of power (however slight) to send them to the bottom of your tranny pan.

Here are my conclusions after searching the end of the internet for you:

http://www.exedyusa.com/multimedia/s...ndamentals.pdf

Page 23 of this document states K (safety factor)=clutch torque capacity/engine torque capacity. K should be 1.2 nominally which is the advice I've parroted here. Nice of them to give this information, yet leave the consumer uninformed to the clutch torque rating. They also give a crazy formula for determining a clutch's torque rating, but fail to mention any of the values so that we could do it ourselves. Nice kill Exedy!

Soooooooo aside from that techno babble document, I went to 900 Exedy, Exedy Vendor, Daiken, and Daiken Vendor websites and they all spout the same crap about XX%. Now you can find plenty of data on their OMFGBBQ triple plate clutches as they all seem to list exact torque figures, but nothing for thier stage one. So you are stuck chuck!

(800) 346-6091 CAll them and ask them is all you can do. While you are on the phone, tell them that http://www.daikinclutchusaweb.com/Te...nformation.htm sucks monkey butt.

Two websites that took me all of 8 seconds to find the data needed to make an intelligent clutch decision. You already know about ACT, maybe give SPEC a try? Subie Gal loves her some SPEC, I love Subie Gal, therefore I love SPEC too.

http://www.specclutch.com/
http://www.advancedclutch.com/

Best of luck buddy and if you get a straight friggen answer from Exedy, please update this thread and PM me so I'm sure to read it.

Ron
will do! thanks ron for all your help! i actually did try to call tech support for exedy usa tonight, but they were closed when i tried calling around 6 pm est.

honestly, i might just go with the act anyway. after looking at the stuff you pulled up from the intraweb and how they are very misleading and uninformed about their own products, especially information regarding one of their most, if the most, popular clutch for the wrx, i'm a bit weary of their clutches in general now.

i've chatted with act before. they're really helpful guys and know their products well. i know act is a quality clutch... just might be a little TOO MUCH quality for my gearbox

i'm going to try calling exedy tomorrow morning. if those guys can't give me a straight up answer, act it is.

i've looked into spec actually, but there seem to be so many mixed opinions about them that i have been shyed away from spec.
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Old 01-03-2007, 10:18 PM   #14
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Cool, let me know how it goes. I agree about ACT having their crap together. I've had the pleasure of learning a LOT from them via the website, over the phone, and in person at Rim of the World. They may or may not be the "best' clutch manufacturer, but they damn well do a damn good job of acting like it. Ohhhh, the pun!!!!
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Old 01-04-2007, 03:05 AM   #15
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I ran the ACT Street Disc in my 04 WRX with a GT30R for quite awhile. It's definitely stiffer than stock, but was fairly manegeable. I think for your power levels this clutch will be well suited. I made 285whp on pump and 320 on 98 oct and I beat on the clutch / tranmission pretty hard. If you have the stock gears, the gear will probably let go before the ACT Street disc does (we're having a special ). If you want stock like engagement the Exedy organic is the way to go, although the V7 STI may push a bit more power than it can handle.

Cheers,

Gary
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Old 01-04-2007, 03:35 PM   #16
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hey, yeah i actually called exedy today.

power figure limits:
exedy organic stg 1: 287 ft/lbs
exedy 3 puck stg 2: 326 ft/lbs

those are the ratings that russ from daikinusa/exedy gave me.
(unabomber, that's for you)

needless to say, just ordered an act clutch

gruppe-s, i know the gears will let go first that's what i'm worried about with the act clutch. it's happened to me before when i used an rs tranny with this clutch and this motor.
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