Lightweight Flywheel Shudder on '02 WRX, OEM Style Clutch

xanderc · 10-12-2012, 06:13 PM

Awhile ago I installed an Exedy lightweight flywheel and an Exedy OEM replacement clutch on my 2002 WRX. Along with the install, I replaced the trans mount for a Group N one and the pitch stopper with the Group N one. I understood that it would shudder a lot until it was broken in. Also, for some reason, I was missing the spring that goes on the clutch actuator lever.

It's been a few thousand miles and a few months since I did the installation. However, I can't ease out the clutch without having the front end of the car shake like it's going to fall apart. I have to rev the engine quite a bit, at least 2500 rpm, to get the clutch to engage smoothly and once I'm rolling it will engage very smoothly, especially when I lift my foot of the clutch pedal faster than normal.

Is this just the nature of a lightweight flywheel or is there a way to reduce or eliminate the shaking and shuddering?

Thanks.

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dirtslayer · 10-12-2012, 06:23 PM

How was the trans input collar? A lot of times they get chewed by bad throwout bearings and such causing your problem down the line.
Also, you lost clutch fork retainer spring? Get one

Try bleeding clutch to change engagement point

xanderc · 10-13-2012, 03:00 AM

I'll try bleeding the system. What do you mean by input collar? The part of the input shaft that mates with the inner diameter of the throwout bearing? I can't say I paid much attention to how it looked but I can't say I noticed anything wrong with it.

Definitely going to get that spring. I don't know why I haven't ordered it yet.

Counterfit · 10-13-2012, 04:40 AM

I believe he's referring to the "snout" that sticks out from the transmission case which is what the throwout bearing rides on.

Aaron'z 2.5RS · 10-13-2012, 09:01 AM

I've got the same exact set-up (even more bushings) and don't have shutter one... not at the start, not ever...

I'm assuming the LWFW was new? so it should have been perfectly flat, yes?

Did it shutter the FIRST time you drove it? or did it get worse quickly?

WhatTurboLag? · 10-13-2012, 01:52 PM

Since when is the clutch fork retainer spring necessary? I don't have one. Car doesn't feel any different

slayer44wagon · 10-13-2012, 01:59 PM

Mine is the same way

xanderc · 10-13-2012, 03:27 PM

Quote:

Originally Posted by Aaron'z 2.5RS

I've got the same exact set-up (even more bushings) and don't have shutter one... not at the start, not ever...

I'm assuming the LWFW was new? so it should have been perfectly flat, yes?

Did it shutter the FIRST time you drove it? or did it get worse quickly?

Yeah, the flywheel was brand new and I'm assuming was perfectly flat. It did shake a bit if I didn't rev the engine enough on take off or when changing gears but it get better after awhile. Now, it only happens when I'm trying to start by easing out the clutch only.

Maybe it wasn't all that flat despite being brand new.

dirtslayer · 10-14-2012, 01:23 PM

Its always a good idea to check flywheels with a straight edge and feeler gauges first.

And yes, was referring to the snout.
Search tsk snout repair kit and you'll see what I'm talking about

xanderc · 10-15-2012, 06:49 PM

Quote:

Originally Posted by dirtslayer

Its always a good idea to check flywheels with a straight edge and feeler gauges first.

And yes, was referring to the snout.
Search tsk snout repair kit and you'll see what I'm talking about

Interesting... thanks a lot. I think I'm going to open it all up and check out the parallelism of the friction surface. Thanks again.

dirtslayer · 10-16-2012, 10:39 AM

Quote:

Originally Posted by xanderc

Interesting... thanks a lot. I think I'm going to open it all up and check out the parallelism of the friction surface. Thanks again.

No worries, post what you find

10-12-2012, 06:13 PM	#1
xanderc Scooby Newbie Member#: 308664 Join Date: Jan 2012 Chapter/Region: SCIC Location: Los Angeles, Ca Vehicle: 2002 Impreza WRX WRB	Lightweight Flywheel Shudder on '02 WRX, OEM Style Clutch Awhile ago I installed an Exedy lightweight flywheel and an Exedy OEM replacement clutch on my 2002 WRX. Along with the install, I replaced the trans mount for a Group N one and the pitch stopper with the Group N one. I understood that it would shudder a lot until it was broken in. Also, for some reason, I was missing the spring that goes on the clutch actuator lever. It's been a few thousand miles and a few months since I did the installation. However, I can't ease out the clutch without having the front end of the car shake like it's going to fall apart. I have to rev the engine quite a bit, at least 2500 rpm, to get the clutch to engage smoothly and once I'm rolling it will engage very smoothly, especially when I lift my foot of the clutch pedal faster than normal. Is this just the nature of a lightweight flywheel or is there a way to reduce or eliminate the shaking and shuddering? Thanks. * Registered users of the site do not see these ads.

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10-12-2012, 06:23 PM	#2
dirtslayer Scooby Specialist Member#: 242550 Join Date: Mar 2010 Chapter/Region: SCIC Vehicle: 2002 impreza wrx wag olive drab	How was the trans input collar? A lot of times they get chewed by bad throwout bearings and such causing your problem down the line. Also, you lost clutch fork retainer spring? Get one Try bleeding clutch to change engagement point

10-13-2012, 03:00 AM	#3
xanderc Scooby Newbie Member#: 308664 Join Date: Jan 2012 Chapter/Region: SCIC Location: Los Angeles, Ca Vehicle: 2002 Impreza WRX WRB	I'll try bleeding the system. What do you mean by input collar? The part of the input shaft that mates with the inner diameter of the throwout bearing? I can't say I paid much attention to how it looked but I can't say I noticed anything wrong with it. Definitely going to get that spring. I don't know why I haven't ordered it yet.

10-13-2012, 04:40 AM	#4
Counterfit Scooby Specialist Member#: 124254 Join Date: Aug 2006 Chapter/Region: NESIC Location: Rhode Island Vehicle: 2006 06 SGM Slowbaru "The Scoobinator"	I believe he's referring to the "snout" that sticks out from the transmission case which is what the throwout bearing rides on.

10-13-2012, 09:01 AM	#5
Aaron'z 2.5RS Scooby Guru Member#: 1026 Join Date: Mar 2000 Chapter/Region: MWSOC Location: Hickigan Vehicle: '00 RS/WRX Stg5 '98 RS Stock	I've got the same exact set-up (even more bushings) and don't have shutter one... not at the start, not ever... I'm assuming the LWFW was new? so it should have been perfectly flat, yes? Did it shutter the FIRST time you drove it? or did it get worse quickly?

10-13-2012, 01:52 PM	#6
WhatTurboLag? Scooby Specialist Member#: 243992 Join Date: Apr 2010 Chapter/Region: MWSOC Location: Morton Grove, Illinois Vehicle: 2006 WRX TR WRB	Since when is the clutch fork retainer spring necessary? I don't have one. Car doesn't feel any different

10-13-2012, 01:59 PM	#7
slayer44wagon Scooby Newbie Member#: 300834 Join Date: Nov 2011 Chapter/Region: MAIC Vehicle: 03 wrx wagon silver	Mine is the same way

10-14-2012, 01:23 PM	#9
dirtslayer Scooby Specialist Member#: 242550 Join Date: Mar 2010 Chapter/Region: SCIC Vehicle: 2002 impreza wrx wag olive drab	Its always a good idea to check flywheels with a straight edge and feeler gauges first. And yes, was referring to the snout. Search tsk snout repair kit and you'll see what I'm talking about