New Clutch and Flywheel Review

civic404 · 03-20-2007, 07:32 PM

Well the other day my clutch went out on my 2006 civic si (18500 miles) while I was driving on the interstate. I had the car towed to Honda because I was originally on my way to the dealership to have some warrenty work done. Well after I got the car to the dealership they told me my clutch was out (which I already Knew). So I went ahead and ordered the Exedy Organic Stage I Clutch and the ACT Streetlite fly wheel. (Thanks to Corsport who over nighted it to me). Well it took Honda about a week to install the clutch and fly wheel don't know why but it did. Once I got the car back though I could tell it was totally different, the clutch was a bit heavier not much though but it is noticeable. With the Flywheel you can tell a hugh different the rev hang is completely gone. there is a quicker throttle response and it feels like there is alittle more torque and power when you take off. All in all I like it but it will take a couple days to get use to it. Honda ended up charging me $647 to install it and for everyone wondering why my clutch went out so soon I think it is because I pretty much learned how to drive a stick on this car.

Here are some pics of the clutch and flywheel

BATANG CITY JAIL · 03-20-2007, 07:35 PM

dyno sheet for the said more torque....

stevenshizzle · 03-20-2007, 08:01 PM

Quote:

Originally Posted by BATANG CITY JAIL

dyno sheet for the said more torque....

BCJ, I don't think he planned on blowing his clutch and so of course he probably doesn't have a dyno. With that, we can probably gather that there was an increase in power related to the decrease in flywheel weight. Less parasitic loses. How great are these gains? Minimal probably, but still undeniable.

BATANG CITY JAIL · 03-20-2007, 08:16 PM

Quote:

Originally Posted by stevenshizzle

BCJ, I don't think he planned on blowing his clutch and so of course he probably doesn't have a dyno. With that, we can probably gather that there was an increase in power related to the decrease in flywheel weight. Less parasitic loses. How great are these gains? Minimal probably, but still undeniable.

having a lighten flywheel will sacrifice something.. ethier the torque or the top speed... i forgot what it was...

civic404 · 03-20-2007, 08:49 PM

yeah the gains are very minimal but none the less they are noticeable and I might not be getting anymore torque compared to the stock honda clutch but compared to my clutch that had been slippin' for about a month it feels like alot more torque.

civic404 · 03-20-2007, 08:50 PM

oh and for the dyno I don't have one

Skyline4life · 03-20-2007, 09:18 PM

i Learned stick on my car and its fine...lol

vetkiller · 03-20-2007, 09:31 PM

You must be a slow learner, wow! Blew out the clutch after 18k?! Geez man...

TexasK20Z · 03-20-2007, 10:42 PM

Quote:

Originally Posted by BATANG CITY JAIL

having a lighten flywheel will sacrifice something.. ethier the torque or the top speed... i forgot what it was...

That just doesn't sound right either way... by lightening the flywheel, you remove weight the engine has to turn. Since less energy is wasted in the rotational inertia of the flywheel, you free up more of the power to go to the wheels (same thing happens when you use lighter wheels or a lightened crank pulley since it just removes weight from the other end of the crankshaft). Top speed is not a function of the flywheel either... the car is gear limited as well as drag limited neither of which is a function of the flywheel.

The only thing I lost in going to a light set up in my Subaru was the ease of driving in traffic... the lightened flywheel will make stop and go traffic a little more tedious, but it is nothing one would really complain about.

I think a lighter flywheel would really wake the K20Z up... and am looking forward to the day I replace my clutch/flywheel... not that I plan on doing it soon.

BATANG CITY JAIL · 03-20-2007, 11:17 PM

Quote:

Originally Posted by TexasK20Z

That just doesn't sound right either way... by lightening the flywheel, you remove weight the engine has to turn. Since less energy is wasted in the rotational inertia of the flywheel, you free up more of the power to go to the wheels (same thing happens when you use lighter wheels or a lightened crank pulley since it just removes weight from the other end of the crankshaft). Top speed is not a function of the flywheel either... the car is gear limited as well as drag limited neither of which is a function of the flywheel.

The only thing I lost in going to a light set up in my Subaru was the ease of driving in traffic... the lightened flywheel will make stop and go traffic a little more tedious, but it is nothing one would really complain about.

I think a lighter flywheel would really wake the K20Z up... and am looking forward to the day I replace my clutch/flywheel... not that I plan on doing it soon.

you can't gain both TQ and HP by having a lightend flywheel...

06RALLYREDSI · 03-20-2007, 11:53 PM

whats the diffrence between organic?and the average joe stock clutch??i want a clutch thats isgood and that feels close to stock! does organic wear out faster

BATANG CITY JAIL · 03-20-2007, 11:56 PM

Quote:

Originally Posted by 06RALLYREDSI

whats the diffrence between organic?and the average joe stock clutch??i want a clutch thats isgood and that feels close to stock! does organic wear out faster

organic, you can somke it... lol .really dont know.,..

civic404 · 03-20-2007, 11:57 PM

I wasn't a really slow learn when it came to driving a stick it took me about a week to get the full hang of it and get good at. It could also of been that I was alittle hard on it too.

Omes · 03-21-2007, 12:32 AM

Quote:

Originally Posted by BATANG CITY JAIL

you can't gain both TQ and HP by having a lightend flywheel...

Why is that? I highly doubt that removing rotational mass will decrease torque. Anyone want to clarify this? Also, if you gain TQ, you gain HP. They're both proportional to each other. Are you trying to say that decreasing the weight of the flywheel decreases torque in the upper spectrum of RPMs? Only problem I can see is that the revs would drop faster since you are decreasing the mass moment of inertia.

Acceleration should actually slightly increase everywhere along the rev range since this decrease in moment of inertia allows for the angular acceleration to increase under the same torque (change would be minimal). Same reason why lightened wheels (with a lower mass moment of inertia) help increase acceleration.

BATANG CITY JAIL · 03-21-2007, 12:36 AM

Quote:

Originally Posted by Omes

Why is that? I highly doubt that removing rotational mass will decrease torque. Anyone want to clarify this? Also, if you gain TQ, you gain HP. They're both proportional to each other. Are you trying to say that decreasing the weight of the flywheel decreases torque in the upper spectrum of RPMs? Only problem I can see is that the revs would drop faster since you are decreasing the mass moment of inertia.

Acceleration should actually slightly increase everywhere along the rev range since this decrease in moment of inertia allows for the angular acceleration to increase under the same torque (change would be minimal). Same reason why lightened wheels (with a lower mass moment of inertia) help increase acceleration.

some body told me that..

there is something about it being lightend...

TexasK20Z · 03-21-2007, 12:45 AM

Quote:

Originally Posted by BATANG CITY JAIL

you can't gain both TQ and HP by having a lightend flywheel...

Actually... lightening anything in the car does not MAKE either power or torque. Lightening of the flywheel, crank pulley and rotating assembly frees up power the engine is already making. The engine makes the power and uses part of it up to turn the parts. So a dyno may show a gain by replacing the flywheel/crank pulley, the car has really gained no additional power.

Also... since HP is a function sharing a direct relationship with torque, you can't gain HOP without gaining torque. HP= ((torque)(rpm))/5250 ... there fore at any given engine speed, torque must increase for HP to increase.

***Shinobi*** · 03-21-2007, 12:49 AM

i think it was if you lighten it then you get more low end but sacrifice top speed. kind of like if you push a truck and a car down a hill in neutral. it will be easier to push the car but once they both get going the truck is gonna be be going faster, longer, than the car. i could be totally off though.

TexasK20Z · 03-21-2007, 12:52 AM

Quote:

Originally Posted by BATANG CITY JAIL

there is something about it being lightend...

That would be the "drivability"... the flywheel in an automobile is there to maintain engine speed between shifts (and thus the reason why an auto does not have a flywheel). It makes shifting gears easier since the driver does not have to really rev match. With a lightened flywheel, the engine speeds will drop much quicker between shifts, so the person driving must monitor the engine speed and correct (rev match) the engine speed to the shift. A heavy flywheel is sort of a low tech dummy device... it keeps the average driver from screwing up his transmission.

TexasK20Z · 03-21-2007, 12:53 AM

Quote:

Originally Posted by Shinobi

i think it was if you lighten it then you get more low end but sacrifice top speed. kind of like if you push a truck and a car down a hill in neutral. it will be easier to push the car but once they both get going the truck is gonna be be going faster, longer, than the car. i could be totally off though.

Totally off as the example does not factor in a vehicle being propelled by an engine... you could take a 5oz "pine wood derby" car with no engine and still whoop its ass with a 2oz slot car since the slot car has an "engine."

Neither torque nor top end speed is lost by a lightened flywheel.

***Sirbelch*** · 03-21-2007, 12:58 AM

The fly wheel's purpose in life is to enough keep inertia so the engine won't stall when you pull away from a light. The less weight the fly wheel has, the less inertia it has to get you off the line. But after you leave the line, the fly wheel is just dead weight the engine has to move. So to make up for the inertia lost with a lighter flywheel, one has to leave at a higher rpm. As stated earlier, the fly wheel doesn't ADD hp it lets more hp get to the ground.
This freed up hp will show up on a dyno just like a pully set or a set of light weight wheels and tires and lighter brakes. There is no gain in the low end or loss in the high end or vice versa. Take a phycis class people or read every technobable in SCC you can get your hands on.

03-20-2007, 07:32 PM	#1 (permalink)
civic404 Member Join Date: Jan 2006 Location: Peoria,IL Age: 20 Posts: 72 iTrader: 0 / 0%	New Clutch and Flywheel Review Well the other day my clutch went out on my 2006 civic si (18500 miles) while I was driving on the interstate. I had the car towed to Honda because I was originally on my way to the dealership to have some warrenty work done. Well after I got the car to the dealership they told me my clutch was out (which I already Knew). So I went ahead and ordered the Exedy Organic Stage I Clutch and the ACT Streetlite fly wheel. (Thanks to Corsport who over nighted it to me). Well it took Honda about a week to install the clutch and fly wheel don't know why but it did. Once I got the car back though I could tell it was totally different, the clutch was a bit heavier not much though but it is noticeable. With the Flywheel you can tell a hugh different the rev hang is completely gone. there is a quicker throttle response and it feels like there is alittle more torque and power when you take off. All in all I like it but it will take a couple days to get use to it. Honda ended up charging me $647 to install it and for everyone wondering why my clutch went out so soon I think it is because I pretty much learned how to drive a stick on this car. Here are some pics of the clutch and flywheel Last edited by civic404; 03-20-2007 at 07:58 PM.

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03-20-2007, 07:35 PM	#2 (permalink)
BATANG CITY JAIL Senior Member Join Date: Jul 2006 Location: Durham, NC..£╖╒◙o├æ Posts: 8,316 iTrader: 10 / 100%	dyno sheet for the said more torque....

03-20-2007, 08:49 PM	#5 (permalink)
civic404 Member Join Date: Jan 2006 Location: Peoria,IL Age: 20 Posts: 72 iTrader: 0 / 0%	yeah the gains are very minimal but none the less they are noticeable and I might not be getting anymore torque compared to the stock honda clutch but compared to my clutch that had been slippin' for about a month it feels like alot more torque.

03-20-2007, 08:50 PM	#6 (permalink)
civic404 Member Join Date: Jan 2006 Location: Peoria,IL Age: 20 Posts: 72 iTrader: 0 / 0%	oh and for the dyno I don't have one

03-20-2007, 09:18 PM	#7 (permalink)
Skyline4life Senior Member Join Date: Dec 2005 Location: Buffalo Grove, IL Age: 19 Posts: 2,958 Evan iTrader: 0 / 0%	i Learned stick on my car and its fine...lol

03-20-2007, 09:31 PM	#8 (permalink)
vetkiller Senior Member Join Date: Oct 2006 Location: Minneapolis Posts: 528 iTrader: 0 / 0%	You must be a slow learner, wow! Blew out the clutch after 18k?! Geez man...

03-20-2007, 11:53 PM	#11 (permalink)
06RALLYREDSI Senior Member Join Date: May 2006 Location: CENTRAL,CALI Posts: 820 K20 rocket iTrader: 0 / 0%	whats the diffrence between organic?and the average joe stock clutch??i want a clutch thats isgood and that feels close to stock! does organic wear out faster

03-20-2007, 11:57 PM	#13 (permalink)
civic404 Member Join Date: Jan 2006 Location: Peoria,IL Age: 20 Posts: 72 iTrader: 0 / 0%	I wasn't a really slow learn when it came to driving a stick it took me about a week to get the full hang of it and get good at. It could also of been that I was alittle hard on it too.

03-21-2007, 12:49 AM	#17 (permalink)
*Shinobi* VIP Member Join Date: Sep 2006 Posts: 217 iTrader: 1 / 100%	i think it was if you lighten it then you get more low end but sacrifice top speed. kind of like if you push a truck and a car down a hill in neutral. it will be easier to push the car but once they both get going the truck is gonna be be going faster, longer, than the car. i could be totally off though.

03-21-2007, 12:58 AM	#20 (permalink)
*Sirbelch* Louder than 4 F404-GE-400 Join Date: Jan 2007 Location: Vacaville CA Age: 26 Posts: 5,542 Paul iTrader: 1 / 100%	The fly wheel's purpose in life is to enough keep inertia so the engine won't stall when you pull away from a light. The less weight the fly wheel has, the less inertia it has to get you off the line. But after you leave the line, the fly wheel is just dead weight the engine has to move. So to make up for the inertia lost with a lighter flywheel, one has to leave at a higher rpm. As stated earlier, the fly wheel doesn't ADD hp it lets more hp get to the ground. This freed up hp will show up on a dyno just like a pully set or a set of light weight wheels and tires and lighter brakes. There is no gain in the low end or loss in the high end or vice versa. Take a phycis class people or read every technobable in SCC you can get your hands on.