Clutch recommendations?
Full Member
Joined: Jan 2004
Posts: 229
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From: Orlando
I'm planning on having between 600rwhp-660rwhp, I want to know if you guys think that an ACT 4 puck sprung with a lightened flywheel, and extreme pressure plate could hold this amount of power? I've seen a local 600 plus rwhp rx7 use a 6 puck sprung and his never blew, I just want to base my desicion off of many other Rx-7 owners not just one.
Alex
Alex
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Joined: Mar 2001
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From: Florida
I have the ACT Extreme pressure plate and a stock organic disk. I too bought the entire package from SR Motorsports along with a 9.5lb. flywheel. I've used the disk with 330rwhp and the stock twins and kept it when I went with a big single to my current 400rwhp setup. It's starting to show symtoms that it needs to be replaced and it may even be slipping slightly at higher rpm. Shuddering badly, esp. when cold. The organic disk does not take well to drag racing, especially if you slip the disk a bit off the line. The Exedy will probaby be my next clutch and I'm sure the slightly heavier flywheel will help with low-end torque and getting off the line a bit better with the single.
Senior Member
Joined: Jun 2004
Posts: 286
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From: Manhattan Beach, CA
Originally Posted by maxcooper
I am aware of the 400 HP published rating (400 or so TQ, really). My understanding, based on rumors of a conversation someone had with an Exedy engineer (how's that for rock-solid proof! 
), is that the actual capacity is around 600 ft-lbs.
Perhaps you do need a 600 ft-lbs capacity clutch for a car that has around 400 ft-lbs of torque (which is more than a 450 RWHP RX-7 has anyway). The momentary torque the clutch must hold on a hard launch or shift is greater than the engine's torque rating, for example, since the momentum of the rotating assembly adds its own contribution. The Exedy rating may be a dynamic rating of "if your car has 400 HP...", where the ratings other clutch companies publish might be the simple mechanical limits of the clutch (will hold 400 ft-lbs... but will slip if you drop the clutch on your car with 350 ft-lbs, since the momentary torque will be greater than 400 ft-lbs).
-Max
), is that the actual capacity is around 600 ft-lbs.Perhaps you do need a 600 ft-lbs capacity clutch for a car that has around 400 ft-lbs of torque (which is more than a 450 RWHP RX-7 has anyway). The momentary torque the clutch must hold on a hard launch or shift is greater than the engine's torque rating, for example, since the momentum of the rotating assembly adds its own contribution. The Exedy rating may be a dynamic rating of "if your car has 400 HP...", where the ratings other clutch companies publish might be the simple mechanical limits of the clutch (will hold 400 ft-lbs... but will slip if you drop the clutch on your car with 350 ft-lbs, since the momentary torque will be greater than 400 ft-lbs).
-Max
Aside from calling, are there any reputable. . . REPUTABLE 
online retailer's that sell the Exedy Hyper single with Flywheel? I've checked on Rxecret7, and a few of the more common sites to no avail. Please post a link, if applicable. If not, i'll call the number that was listed in the other thread about the Exedy. thanks all!
online retailer's that sell the Exedy Hyper single with Flywheel? I've checked on Rxecret7, and a few of the more common sites to no avail. Please post a link, if applicable. If not, i'll call the number that was listed in the other thread about the Exedy. thanks all!
WWFSMD
Joined: Jun 2001
Posts: 5,035
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From: SoCal
Photo Diety
Joined: Mar 2001
Posts: 2,311
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From: Florida
Ok, how about their stage 4 carbon clutch...is that in regular production yet? They've been advertising it for over a year but I have yet to actually see someone using one or even a price on them. The carbon stuff is supposed to take better to being side stepped (slipped) which is why I'm interested.
I just got done putting in my exedy twin plate. All i can say is that its the best things ive bought for my car. The cintered iron setup was good bc nothing would slip it but was the worst thing to drive. it made me not even look forward to driving my car. The exedy twin plate is out of this world. as long as it doesnt slip.. which they say it holds 750 atw so thatll be fine. I cant say enuogh about it.
Greg
Greg
Newbie
Joined: Jul 2004
Posts: 1
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From: Rhode Island
Has anyone tried out South Bend Clutch. My boyfriend used one of their F Series Clutch Kits on his 93' with T78, Haltech, dyno 600+ hp with no problems at all. Not many people have heard of south bend but I also use one in my turbo integra 275 whp with no problems. They deal mostly with diesel trucks and have just recently got into the sport compact industry.
Give them a quick look
Check them out
www.southbendclutch.com
Later,
Melissa
Give them a quick look
Check them out
www.southbendclutch.com
Later,
Melissa
Joined: Oct 2001
Posts: 6,279
Likes: 728
From: Florence, Alabama
just a quick update...
i now have 1680 miles on my Exedy Hyper Single. i had the occasion to yank my motor the other day which gave me a look at how the clutch package is wearing.
it looks just like when it came out of the box on may 15th.
as most of you know i found that the clutch surpassed my most optimistic expectations. IMO, pedal pressure is no more than stock. the clutch feathers/slips nicely. according to Exedy's head USA tech guy it will hold 600 ft pounds even though the sales literature quotes a smaller number.
there was an earlier question as to syncro life..... (when you run a heavier than stock clutch disc it doesn't slow properly between shifts and is death on syncros) i weighed everything and the Exedy disc weighs the same as the oem disc. shifts like oem.
do take a LOOK at this package. it is priced about the same as other clutches if you are buying the flywheel but is radically different as to configuration and performance...
there is all this double disc talk... Exedy makes one as well. i don't understand why 99% of the peeps on the forum would be interested in buying something that is around $500 more that has almost no advantages versus the Hyper Single...
maybe if you are making more that 600 ft pounds of torque? if you are please do post your dyno sheet.
howard coleman
i now have 1680 miles on my Exedy Hyper Single. i had the occasion to yank my motor the other day which gave me a look at how the clutch package is wearing.
it looks just like when it came out of the box on may 15th.
as most of you know i found that the clutch surpassed my most optimistic expectations. IMO, pedal pressure is no more than stock. the clutch feathers/slips nicely. according to Exedy's head USA tech guy it will hold 600 ft pounds even though the sales literature quotes a smaller number.
there was an earlier question as to syncro life..... (when you run a heavier than stock clutch disc it doesn't slow properly between shifts and is death on syncros) i weighed everything and the Exedy disc weighs the same as the oem disc. shifts like oem.
do take a LOOK at this package. it is priced about the same as other clutches if you are buying the flywheel but is radically different as to configuration and performance...
there is all this double disc talk... Exedy makes one as well. i don't understand why 99% of the peeps on the forum would be interested in buying something that is around $500 more that has almost no advantages versus the Hyper Single...
maybe if you are making more that 600 ft pounds of torque
? if you are please do post your dyno sheet.howard coleman
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