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What Gives?: Twin Disc Systems by the numbers

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Old Feb 9, 2005 | 12:04 PM
  #136  
Curt@MrLed's Avatar
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From: A.K.A. DaFarmer
okay i like a little stiffer clutch pedal. just my 2 cents.. but do you guys (rnr) have the prob. with the flywheel and starter..
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Old Feb 9, 2005 | 12:06 PM
  #137  
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From: Metro Detroit
Originally Posted by dafarmer69
at the rate were going here, everyone who drags the car should convert to a powerglide trans. ford 9 inch rear, probs solved.. it seems no matter how much we beat this topic, there is still no good answer.. or is there, uk, japan, europe, these countries have had every version of the evo.. but nobody in all these years has come up with a strudy clutch? tested and proven... after all exedy did design the horrible clutch that came factory on our cars. or we could blame mitsu. for being cheap. both are prob. true....its not like the evo hasnt been around long enough for r-d.. oh well one day we'll have a clutch that can handle the beating, and trans gears made out of rubber.. no more grinding..

Exedy produces clutches for 11 Vehicle Manufactures in Japan. Exedy and its sister company Aisin hold 85% of the OEM clutch market in Japan. They also produce clutches for American manufactures GM and Ford. For example Exedy has just won the contract for the new Chevy Cobalt clutch and have moved into production.

When Exedy develops an OEM clutch it is designed to THE MANUFACRUES specifications and to THEIR quality standards. Deviating from these standards is NOT permitted weather Exedy feels the clutch is good or bad.

It is Exedy’s opinion that the OEM clutch is extremely good and well within specs for it's intended purpose (stock, proper break in, easy driving). Exedy has it’s own opinions on why clutches are burning out stock, but that is another issue.

Exedy designs performance clutches in the shadow of the OEM, but to what the engineers think would be appropriate for the performance enthusiast.

In the event Exedy deviates from Specified Quality Specs provided by the manufacture, here is what happens

-The production line stops
-2000 people on the production line stand still for 1 minute
-The amount Exedy is fined is approx. $8000 PER MINUTE.

Hence, when people say an Exedy clutch cover doesn't disengage, we question it since Exedy supplies manufactures with 5000 clutches / month and none are faulty.

It leads Exedy to believe that installation is improperly done or other factors influence it’s performance. Robotics on the line checks EVERY OEM unit before it leaves the plant. As for Performance - Robotics AND Visual checks are performance before it leaves.

-M

Last edited by MattGold; Feb 9, 2005 at 12:20 PM.
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Old Feb 9, 2005 | 12:14 PM
  #138  
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From: Metro Detroit
Originally Posted by TalonRcR
I believe your the one who told me exedy lets them use there patent right?

Chris
All we do it sell them our OEM Covers. They do not necessarily have the "right" to the patent.


Returning to the issue of weight just for a moment - I had a guy in our warehouse weigh an OEM Pressure Plate for an Evo VIII.

That weighed in at 15.43 lbs (the exact one we ship to RPS)... howeve, you are saying the TOTAL weight (as pictured) of the RPS unit is 29lbs.

So are you telling me - the RPS unit with Flywheel (including carbon and rivets) a THICK dampening plate, AND two discs weigh UNDER 14lbs? Not to mention the carbon that is riveted onto the P.Plate casting?

Please clear that up for me... it somehow just doesn't add up.


-M
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Old Feb 9, 2005 | 12:44 PM
  #139  
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From: San Diego
The Cusco unit we had in a customers car was rather brutal in my opinion, but I do have knee problems from my College athletic days.
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Old Feb 9, 2005 | 01:12 PM
  #140  
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From: 2003 Evo VIII - Silver
Originally Posted by MattGold
Yes, they use our P. Plates/Snap-In Mechnism. But that's not what is pictures in your photo.

Note the snap-in ring on the Exedy, and nothing on the RPS.

-M
The snap ring was no doubt missing from the one in your photo as it blew up on the dyno after two passes and I think the ring was destroyed
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Old Feb 9, 2005 | 03:30 PM
  #141  
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From: Socal
I don't want to get into the whole e-tard argument mentality, so I am just going to post some things I know as facts from my personal car.

I make 400 - 429whp on my pump gas map depending on how much boost I run. I like to stay on the low side though because I don't trust pump gas. Lately I have only fed the car 110 octane and 26psi. On that map I have logged 528whp. I am not going to assume what the car will do on c16 or with more boost, so I'll leave it at what has been done already.

I have the RPS twin carbon clutch in this car and have several thousand miles on it. I think around 6K now. Here are my impressions on a few different aspects of this Clutch.

Startup: The clutch does not sound like stock on the startup, but I would not describe it as a grind. There is a faint whine while cranking. You can hear it more on my car because the AEM takes a few more cranks to startup the car than the stock ecu. It is really not loud or obnoxious at all. It doesn't turn heads in a parking lot, or any other stuff like that. It is very faint. I have avtually heard the same noise from several ATS clutch cars that I have been in or driven. Anyways, it is barely anything at all on my car. I wouldn't even mention it in conversation but I figured for this thread it should be nit picked for informational purposes.

Noise: I have driven alot of aftermarket clutches. I have tuned many differnt EVOs with all sorts of parts, as well as other cars. The RPS CC is the quietest multi disc clutch I have ever driven or heard. Does it make noise? Yes. The thing is that the car has to be somewhere really quiet, like when the tail of my car is outside the garage and the nose in inside. Then I can hear it. Or in a very quiet residential neighborhood at night, sitting at a stop. Under normal day to day driving conditions, I really never hear the thing. Some clutches practically play jingle bells at every freaking stop light. In my car, at a light, with other cars around and regular ambient noise, you can not hear the clutch. It is dead silent, so to speak.

Slippage: I was told by the guys at RPS that the clutch may slip when cold, especially with cars making alot of power. I guess I am not at that level yet. I have never had it slip on my under accelleration. Not once. I warmed the car up to operating temps in my driveway on a cold morning, then pulled onto the street and whomped on it at 26psi just to see if I could get it to slip. No chance. I guess I will need more power for that.

Drivability: I have posted it before on this forum, but I will do it again here. If you want to know what this clutch will drive like, just pay close attention to the way a good stock EVO clutch drives like. I'm not kidding. I drive my car every day and I have no reminders of the fact that I am on an aftermarket clutch, especially one that will hold the power it does. Mind you, I live in Southern California and drive the $hitty @ss 405 freeway quite often, where it always seems to be rush hour. The EVO is no Mercedes, but I'll say that I wouldn't want any other aftermarket clutch in the car for that stop and go traffic. The pedal is light, soft and smooth. I am teaching my wife to drive stick in my EVO if that says anything.

Customer Service: The guys at RPS are very profesional, but at the same time, seem much more family like. You can shoot the $hit with them, and they are very helpful and willing to explain things. The best way to describe it is like this. They care. Thats it. They care. If you own one of their clutches and call them up, they will tell you that they will stand behind the product for it's lifetime, and they mean it. I have a very comfertable dealing with those guys.

BTW. Your stomach would churn if you saw how they warmed up the clutch on a 1435rwhp Supra before a dyno pull. It is unbelievable how much abuse they will put this clutch through and just laugh the whole time. What is more unbelievable is what happens when they repeat the process 30+ times and take the clutch out for inspection. Your jaw will drop. Call them up. They'll explain.

If anyone has any questions that didn't get answered here, please feel free to ask.
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Old Feb 9, 2005 | 03:42 PM
  #142  
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Originally Posted by STFU Tuning
I don't want to get into the whole e-tard argument mentality, so I am just going to post some things I know as facts from my personal car.

I make 400 - 429whp on my pump gas map depending on how much boost I run. I like to stay on the low side though because I don't trust pump gas. Lately I have only fed the car 110 octane and 26psi. On that map I have logged 528whp. I am not going to assume what the car will do on c16 or with more boost, so I'll leave it at what has been done already.

I have the RPS twin carbon clutch in this car and have several thousand miles on it. I think around 6K now. Here are my impressions on a few different aspects of this Clutch.

Startup: The clutch does not sound like stock on the startup, but I would not describe it as a grind. There is a faint whine while cranking. You can hear it more on my car because the AEM takes a few more cranks to startup the car than the stock ecu. It is really not loud or obnoxious at all. It doesn't turn heads in a parking lot, or any other stuff like that. It is very faint. I have avtually heard the same noise from several ATS clutch cars that I have been in or driven. Anyways, it is barely anything at all on my car. I wouldn't even mention it in conversation but I figured for this thread it should be nit picked for informational purposes.

Noise: I have driven alot of aftermarket clutches. I have tuned many differnt EVOs with all sorts of parts, as well as other cars. The RPS CC is the quietest multi disc clutch I have ever driven or heard. Does it make noise? Yes. The thing is that the car has to be somewhere really quiet, like when the tail of my car is outside the garage and the nose in inside. Then I can hear it. Or in a very quiet residential neighborhood at night, sitting at a stop. Under normal day to day driving conditions, I really never hear the thing. Some clutches practically play jingle bells at every freaking stop light. In my car, at a light, with other cars around and regular ambient noise, you can not hear the clutch. It is dead silent, so to speak.

Slippage: I was told by the guys at RPS that the clutch may slip when cold, especially with cars making alot of power. I guess I am not at that level yet. I have never had it slip on my under accelleration. Not once. I warmed the car up to operating temps in my driveway on a cold morning, then pulled onto the street and whomped on it at 26psi just to see if I could get it to slip. No chance. I guess I will need more power for that.

Drivability: I have posted it before on this forum, but I will do it again here. If you want to know what this clutch will drive like, just pay close attention to the way a good stock EVO clutch drives like. I'm not kidding. I drive my car every day and I have no reminders of the fact that I am on an aftermarket clutch, especially one that will hold the power it does. Mind you, I live in Southern California and drive the $hitty @ss 405 freeway quite often, where it always seems to be rush hour. The EVO is no Mercedes, but I'll say that I wouldn't want any other aftermarket clutch in the car for that stop and go traffic. The pedal is light, soft and smooth. I am teaching my wife to drive stick in my EVO if that says anything.

Customer Service: The guys at RPS are very profesional, but at the same time, seem much more family like. You can shoot the $hit with them, and they are very helpful and willing to explain things. The best way to describe it is like this. They care. Thats it. They care. If you own one of their clutches and call them up, they will tell you that they will stand behind the product for it's lifetime, and they mean it. I have a very comfertable dealing with those guys.

BTW. Your stomach would churn if you saw how they warmed up the clutch on a 1435rwhp Supra before a dyno pull. It is unbelievable how much abuse they will put this clutch through and just laugh the whole time. What is more unbelievable is what happens when they repeat the process 30+ times and take the clutch out for inspection. Your jaw will drop. Call them up. They'll explain.

If anyone has any questions that didn't get answered here, please feel free to ask.

You mean the clutch that failed in Saad Saad's car? The one hye replaced with the Tilton?

Sean
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Old Feb 9, 2005 | 03:46 PM
  #143  
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From: Socal
Originally Posted by Sean I
You mean the clutch that failed in Saad Saad's car? The one hye replaced with the Tilton?

Sean
Sean,

I was not aware of that. Everything was working fine last I heard.
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Old Feb 9, 2005 | 04:26 PM
  #144  
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ok I started reading this thread and it made my head hurt

AMS has been working with Exedy products since the EVO VIII's introduction to the states. We have never been more happy with a vendor. The biggest thing to keep in mind when purchasing an EXEDY Clutch is BE SPECIFIC on your Horsepower and torque number. If you undershoot in and overwork the clutch you will pay the price in the end. I have driven and raced an Evo with every clutch offered for the EVO VIII and all of them were very streetable to me. I am sure since we sell and run the Exedy in our car you will take this as a biased post but for what its worth I would be buying this product even if I was some joe off the street. Keep up the good work Exedy.

Eric
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Old Feb 9, 2005 | 04:31 PM
  #145  
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From: SL,UT
Exedy's great, it's the multi-plate clutches that they're saying suck
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Old Feb 9, 2005 | 05:49 PM
  #146  
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From: Socal
Originally Posted by Sean I
You mean the clutch that failed in Saad Saad's car? The one hye replaced with the Tilton?

Sean
I actually just double checked on this and as it turns out, one of the pucks on Saad Saad's car cracked at some point and while it was down Saad Saad had the idea of trying out a Tilton. The guys at RPS actually encouraged it so they could get some feedback on that clutch. He had a problem with the Tilton though. If was a tripple and was too grabby. I guess it was like an on/off switch. Anyways, Saad Saad has an RPS back in his Supra. I thought you guys should know. The issue was taken care of.
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Old Feb 9, 2005 | 07:11 PM
  #147  
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Originally Posted by STFU Tuning
I don't want to get into the whole e-tard argument mentality, so I am just going to post some things I know as facts from my personal car.

I make 400 - 429whp on my pump gas map depending on how much boost I run. I like to stay on the low side though because I don't trust pump gas. Lately I have only fed the car 110 octane and 26psi. On that map I have logged 528whp. I am not going to assume what the car will do on c16 or with more boost, so I'll leave it at what has been done already.

I have the RPS twin carbon clutch in this car and have several thousand miles on it. I think around 6K now. Here are my impressions on a few different aspects of this Clutch.

Startup: The clutch does not sound like stock on the startup, but I would not describe it as a grind. There is a faint whine while cranking. You can hear it more on my car because the AEM takes a few more cranks to startup the car than the stock ecu. It is really not loud or obnoxious at all. It doesn't turn heads in a parking lot, or any other stuff like that. It is very faint. I have avtually heard the same noise from several ATS clutch cars that I have been in or driven. Anyways, it is barely anything at all on my car. I wouldn't even mention it in conversation but I figured for this thread it should be nit picked for informational purposes.

Noise: I have driven alot of aftermarket clutches. I have tuned many differnt EVOs with all sorts of parts, as well as other cars. The RPS CC is the quietest multi disc clutch I have ever driven or heard. Does it make noise? Yes. The thing is that the car has to be somewhere really quiet, like when the tail of my car is outside the garage and the nose in inside. Then I can hear it. Or in a very quiet residential neighborhood at night, sitting at a stop. Under normal day to day driving conditions, I really never hear the thing. Some clutches practically play jingle bells at every freaking stop light. In my car, at a light, with other cars around and regular ambient noise, you can not hear the clutch. It is dead silent, so to speak.

Slippage: I was told by the guys at RPS that the clutch may slip when cold, especially with cars making alot of power. I guess I am not at that level yet. I have never had it slip on my under accelleration. Not once. I warmed the car up to operating temps in my driveway on a cold morning, then pulled onto the street and whomped on it at 26psi just to see if I could get it to slip. No chance. I guess I will need more power for that.

Drivability: I have posted it before on this forum, but I will do it again here. If you want to know what this clutch will drive like, just pay close attention to the way a good stock EVO clutch drives like. I'm not kidding. I drive my car every day and I have no reminders of the fact that I am on an aftermarket clutch, especially one that will hold the power it does. Mind you, I live in Southern California and drive the $hitty @ss 405 freeway quite often, where it always seems to be rush hour. The EVO is no Mercedes, but I'll say that I wouldn't want any other aftermarket clutch in the car for that stop and go traffic. The pedal is light, soft and smooth. I am teaching my wife to drive stick in my EVO if that says anything.

Customer Service: The guys at RPS are very profesional, but at the same time, seem much more family like. You can shoot the $hit with them, and they are very helpful and willing to explain things. The best way to describe it is like this. They care. Thats it. They care. If you own one of their clutches and call them up, they will tell you that they will stand behind the product for it's lifetime, and they mean it. I have a very comfertable dealing with those guys.

BTW. Your stomach would churn if you saw how they warmed up the clutch on a 1435rwhp Supra before a dyno pull. It is unbelievable how much abuse they will put this clutch through and just laugh the whole time. What is more unbelievable is what happens when they repeat the process 30+ times and take the clutch out for inspection. Your jaw will drop. Call them up. They'll explain.

If anyone has any questions that didn't get answered here, please feel free to ask.

I would have to agree with you. The rps clutch drives like a stock clutch. I have a rs that is about 350whp and I have no issues.

Andrew Wagner

Last edited by Speedlimit; Feb 12, 2005 at 12:06 PM.
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Old Feb 9, 2005 | 07:38 PM
  #148  
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How come the only folks saying how great the RPS clutch is are people that work at, or own a shop that sells/endorses RPS? The average consumer (the rest of us watching this thread) will NEVER buy a $2500+ clutch based on a SELLERS story, unless money is NO object. If RPS is that great, put a few in some high-power cars that aren't owned by folks that will make money by selling more clutches and let's see how they do.

This argument (as polite as it is) is pointless. There are hundreds of Evo owners here that are happy with their Exedy Twin. To convince any of them they need a clutch that's twice as much $$ with no real-world feedback is going to be a tough sell in anyones book. Time will tell if the RPS lives up to the hype, but that will take months and years, not days.
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Old Feb 9, 2005 | 07:53 PM
  #149  
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Well said, at least someone else sees it.

Sean

Last edited by Sean I; Feb 9, 2005 at 07:56 PM.
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Old Feb 9, 2005 | 08:56 PM
  #150  
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From: 2003 Evo VIII - Silver
Originally Posted by 992gnt
How come the only folks saying how great the RPS clutch is are people that work at, or own a shop that sells/endorses RPS? The average consumer (the rest of us watching this thread) will NEVER buy a $2500+ clutch based on a SELLERS story, unless money is NO object. If RPS is that great, put a few in some high-power cars that aren't owned by folks that will make money by selling more clutches and let's see how they do.

This argument (as polite as it is) is pointless. There are hundreds of Evo owners here that are happy with their Exedy Twin. To convince any of them they need a clutch that's twice as much $$ with no real-world feedback is going to be a tough sell in anyones book. Time will tell if the RPS lives up to the hype, but that will take months and years, not days.
I sold 50 Exedy Twins over the last year - only one guy had a problem and Exedy was kind enough to swap him out for a new unit - even thogh the guy had been drag racing it every weekend and the failure was clearly abuse and racing.
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