for the Exedy stage 1 clutch and lightweight flywheel, is there any difference in horsepower? or are the materials used help with slippage and nothing else?
i was thinking about getting both because my si's clutch is starting to wear out.

 

Definitely don't go anything above stage 1.

Even stage 1 is a little heavy for a (I'm assuming) stock Si.

 

i got a short ram intake in already with a cat back and 4-1 headers comin very soon. i reckon the clutch will go out in about a half a year if i go easy on it. i'll have both the exhaust and headers in before then. im just tryin to get some input in before i decide what to get

 

The stage-1 will hold bolt-ons just fine, and trust me you do not want to drive a heavy, grabby clutch in traffic. Exedy makes the stock clutch in the Si, but even their bottom rung organic disk replacement clutch is better than the stock one. If you plan to go FI, then a much stronger clutch would be in order.

 

What makes you think the clutch will go in a half of a year? If you only add 10 to 20 ft/lbs of torque from bolt ons the stock clutch will be fine forever unless you suck at stick. If the clutch fails prematurely it will not be from your bolt ons.

I have 302 torque at the wheels and my stock clutch holds fine. It won't forever but I know it won't go out real quick.

 

Exedy Stage 1 is rated to 205 ft/lb torque. Stock, the SI pushes something like 137 to 140 ft/lb torque, so stage 1 should be plenty. I am not absolutely sure what the torque rating is on a stock clutch but I think I was told it was somewhere around 160 ft/lbs. Keep in mind, driving with a performance clutch is completely different from a stock clutch. Most performance clutches engage right off the floor and grab pretty hard. As someone already stated, not fun in traffic. I run a stage II (not Exedy) and it is feels like it is either in or out, there is no between. Damn near impossible to drive in traffic without stalling.

 

I dont mean to thread jack.... with changing to a stage 1 clutch with just bolt ons how long would that clutch last compared to a stock clutch? Reason I ask i know nothing about aftermarket clutches.

 

Ever notice that your stock clutch isn't covered by the factory warranty? There is no way for us to realistically answer that, we don't know how you drive. You may think you are treating the clutch just fine but really you are slipping it like crazy, thus killing it. It could easily last the life of the car, or it could need to be replaced in the next year.

 

What about replacing stock clutch and adding a lighter flywheel? What kind of flywheel would you recommend, and how is driveability?

 

FijiBlue I have already replaced the stock clutch in my 06 Si and found that Honda is using Exedy. Anyways go with a stage one and an ACT Streetlite you won't regret it. Drive ability is fine and the car revs so much faster.

 

Any good links as to where to pick this up at a decent price?

 

Common people, does no one use sponsor links or visit other sites? I know that there are tons of sponsor deals over on 8th all the time, or check this link:
http://lmgtfy.com/?q=k20+lightweight+flywheel

All K20 are using the same flywheels, go look up the part numbers if ya doubt it.

 

Does anyone know what the stock weight is on our flywheel?

 

21lbs IIRC.

 

Wow, so the Exedy only weighs in at 8lbs. Man that is a huge difference.

 

Esp. when you consider it's rotational mass. If pulleys are noticeable, then imagine what this will be like.

 

Yeah this flywheel is def on my list.

 

I bought my bundle (flywheel and clutch) through Corsports. Remi and Tae are really good guys to work with and their products are very competitive with other vendors.

 

with the lighter flywheel, you will get more rev hang because there is less weight.
butt he engine revs and accelerates quicker.

 

Wouldn't be the opposite? The flywheel will be lighter, therefore less rotational mass thus resulting in less momentum meaning the revs drop faster. Same logic in quicker acceleration, only quicker deceleration. Or do I have it backwards?

 

Climbs quicker and drops quicker. The actual downside of a lightweight flywheel is the fact that the rpms fall quicker. Has negative effects when shifting and trying to hold a speed in a turn. There is an easy way to test this too. Tie a length of rope to a full paint can, spin it around and really get the "rpms" up...then try to stop it easily. Now do the same with an empty paint can. I'm willing to bet that the empty one spins up faster and is easier to slow down.

 

Haha! Excellent example!

I did a clutch comparison write-up on my site: http://importnut.net/clutchcomparo.htm

You do not want a monster pucked clutch for a dialy driver. It sucks and in a big way. I love the Exedy clutch I used in my swapped hatchback. The pedal is a little heavier than stock but the engagement is super smooth.

As it has been pointed out, the stock clutch can handle a lot more than most people realize. I used a stock clutch on an all motor build (about 200whp and 135ft-lb torque). Granted, my torque numbers were not huge so there really wasn't a need for a fancy clutch.

What I did realize is that nearly every "stage 1" aftermarket clutch kit is cheaper than the stock one. Let's see...that's a big "fail" for the stock clutch.

As for the flywheel, light weight flywheels get a lot of bad press. I love them. The only rev hang you will get is from the ECU and the DBW. The engine will rev up and down quicker which will help with rev matching while racing. As for taking off with a lightened flywheel, if you have a decent smooth engaging clutch, there will be no difference. A good driver can take off from idle regardless of the flywheel.

If your clutch is in good shape, don't worry about it. Change it once it wears out. If it ain't broke....

-Alex

 

well my friend has an em1 with the 8lb act flywheel and his revs stay up when he lets off the gas. so i figured it would be the same with our motors

 

Hard to do a web diagnosis but I'm willing to bet something else causes it. Is he boosted?

 

I second this comment. Every car I've experienced with a light weight flywheel has much quicker engine response, reving up and down.