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Old 05-18-2014, 02:30 PM   #1
the_newt
Scooby Newbie
 
Member#: 320788
Join Date: May 2012
Chapter/Region: TXIC
Location: Dallas, TX
Vehicle:
2015 Impreza WRX
Red

Default Clutch chatter after warming up

I had an ACT SB5-HDSS clutch and streetlite flywheel installed on my 350lb/tq 2011 wrx by Cobb Plano a month and 1400 miles ago and it's had terrible dash shaking, wheel hop sounding, metal parts clanking chatter that draws the attention of motorists, pedestrians and probably low flying aircraft wondering wtf is up with that bucking hatch. It is fine when I start out but after 15 minutes of driving it becomes a nightmare to feather or slip the clutch with any shred of smoothness. I can start quickly but have a quarter to half second to get the clutch completely engaged which isn't practical in stop and go traffic.

I've contacted ACT about this and their stance is to disable the car and send everything in so they can poke around it. This is the nuclear option as I don't want to pay Cobb again to take the clutch out, pay to ship it to act the pay to have installed a second time and hope it fixes things. Cobb said everything looked fine she they installed it and the only thread here I found about hot clutch chatter action was due to a bad install. I don't want to throw Cobb under the bus and say they botched the install, but it did take them all day and I got the car back around 745 Saturday night.

So my questions are is this just how it is having a full face clutch with higher torque holding capacity? I can't imagine the drivetrain surviving very long if puck clutches are worse than this. Has anyone else had this issue and had it resolved? Could some bushing be at fault? The car has 53k on it and the group n motor mounts and trans mount were installed at 20k or so along with whitelines rear diff bushing inserts. The car is horrid to drive now and it's less embarrassing on my 50cc zuma scooter.
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Old 05-20-2014, 01:45 PM   #2
Aaron'z 2.5RS
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Member#: 1026
Join Date: Mar 2000
Chapter/Region: MWSOC
Location: Hickigan
Vehicle:
'00 RS/WRX Stg5
'98 RS Stock

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I bet they didnt surface the flywheel prior to the install, new or not it should go on the grinder to make SURE its flat..

I bet itll show its not flat when its taken out too.. cause that's your next step..
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Old 05-20-2014, 02:04 PM   #3
novacivic
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Member#: 117980
Join Date: Jun 2006
Chapter/Region: NESIC
Location: Rochester, NH
Vehicle:
2005 sti
wr blue

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Every act full face clutch I have installed has bred as smooth as stock. I've been running the act xtss in my 05 sti for over 60k now and it has always been as smooth engaging as stock.
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Old 05-20-2014, 08:30 PM   #4
2Fast4U1DAY
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Member#: 250152
Join Date: Jun 2010
Chapter/Region: MAIC
Location: Pennsylvania
Vehicle:
2006 WRX Limited
OBP

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Quote:
Originally Posted by Aaron'z 2.5RS View Post
I bet they didnt surface the flywheel prior to the install, new or not it should go on the grinder to make SURE its flat..

I bet itll show its not flat when its taken out too.. cause that's your next step..
This times a billion!
I can't tell you how many times I have had a customer say, "I recently replaced my clutch, now I have chatter and the car bucks when accelerating from a dead stop".

I dig into it and the flywheel has hot spots all over it and is warped to ****....

Show customer the flywheel....

"OMGWTFBBQ it wasnt like that when I replaced the clutch!"


Yeah....
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Old 05-20-2014, 11:02 PM   #5
the_newt
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Join Date: May 2012
Chapter/Region: TXIC
Location: Dallas, TX
Vehicle:
2015 Impreza WRX
Red

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Unless Cobb has a lathe in the shop I didn't see, they opened it, cleaned it and installed it. Of course ACT will say it was improperly installed and Cobb will call it a defective part. That's how this car has been. I had AEM tell me they didn't make fuel pumps when I called to see why I couldn't get their pump to hold pressure :/. To the support line!
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