first gear rattle - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Raves614 · 04-14-2015, 02:19 PM

Recently got an frs with an ACT Race 6 Pad Sprung Clutch and lightweight flywheel. Sometimes when strating the engine seems to knock. Anyone have any ideas what this could be? It's only on the start and only happens every other time or so.

cdrazic93 · 04-14-2015, 02:48 PM

Race clutch? Sounds like part of owning the clutch. If it's made for performance, then it's going to be lacking in the sound department.

Raves614 · 04-14-2015, 02:52 PM

Quote:

Originally Posted by cdrazic93

Race clutch? Sounds like part of owning the clutch. If it's made for performance, then it's going to be lacking in the sound department.

I fairly new to the tuning game, so I'm just making sure theres a big problem. Then car does shake pretty good at times too if that makes a difference.

cdrazic93 · 04-14-2015, 02:53 PM

Quote:

Originally Posted by Raves614

I fairly new to the tuning game, so I'm just making sure theres a big problem. Then car does shake pretty good at times too if that makes a difference.

When you say start, it's when you turn on the car or when you roll into first?

Raves614 · 04-14-2015, 02:55 PM

Quote:

Originally Posted by cdrazic93

When you say start, it's when you turn on the car or when you roll into first?

Rolling in first. As in leaving a stop sign.

cdrazic93 · 04-14-2015, 03:00 PM

That's sounds standard for clutch rattle.
@CSG Mike, unless I'm wrong?

fika84 · 04-14-2015, 03:05 PM

Quote:

Originally Posted by Raves614

I fairly new to the tuning game, so I'm just making sure theres a big problem. Then car does shake pretty good at times too if that makes a difference.

Shaking could be caused by the harsher clutch engagement or from aftermarket bushings and/or motor mounts. If I didn't know much about tuning and aftermarket parts I wouldn't have bought a modded car... But you have it, do you know the complete list of mods?

#maverick# · 04-14-2015, 03:09 PM

Sounds like your driving a 6 puck clutch add in a lightweight flywheel and solid trans bushings and itll sound like its tearing itself apart. 6 pucks also dont particularly like low rpms haha, have it checked out by a shop if you're worried.

CSG Mike · 04-14-2015, 03:46 PM

Quote:

Originally Posted by Raves614

Recently got an frs with an ACT Race 6 Pad Sprung Clutch and lightweight flywheel. Sometimes when strating the engine seems to knock. Anyone have any ideas what this could be? It's only on the start and only happens every other time or so.

Normal for a setup like yours. Retuning the startup can eliminate the issue if its a startup issue that is intermittent.

Shady195 · 04-14-2015, 04:53 PM

Welcome to the world of pucked clutches

They make noise.

Because Racecar.

Side Note: There will come a point where you're really comfortable with that clutch and you will be able to roll off without any chatter.

mav1178 · 04-14-2015, 06:50 PM

Quote:

Originally Posted by Raves614

Recently got an frs with an ACT Race 6 Pad Sprung Clutch and lightweight flywheel. Sometimes when strating the engine seems to knock. Anyone have any ideas what this could be? It's only on the start and only happens every other time or so.

Don't mistake knock for chatter, which is what you have.

-alex

Raves614 · 04-14-2015, 11:39 PM

Thanks guys. I think you're right. I found the sweet spot to be between 1500-2000 rpms and have been getting a lot smoother take offs. Chatter seems like a better word.

Here's the parts list:

Full Blown Base Turbo Kit including:
FBM Base EL Turbo manifold
Garrett GTX2867R turbo
FBM Aluminum Wrinkled intercooler Piping with couplers
FBM 3" Downpipe
FBM 550hp Intercooler with cast tanks
FBM Intake Pipe
FBM Dump tube
Precision Turbo 39mm wastegate
Tial 50mm Q BOV
Bosch 550cc injectors
FBM 270LPH Pump
FBM Dual slim fans
Turbo Blanket

EcuTek Licesnce and Cable
Custom Dyno Tune from Hal@Dynosty for 93 octane
Custom Dyno Tune from Hal@Dynosty for e85

Motiv Concepts Front Pipe
Motiv Concepts Overpipe
MX-P Full Catback Exhaust

Full Blown Radiator
Cusco Oil Catch Can

ACT Race 6 Pad Sprung Clutch and lightweight flywheel

Black Enkei Raijin Wheels 18x8.5
Michelin Pilot Super Sport Tires - 235/18/40 Front and 255/18/40 Rear

04-14-2015, 02:48 PM	#2
cdrazic93 Junior Join Date: Aug 2013 Drives: a car Location: Probably at school Posts: 4,341 Thanks: 3,184 Thanked 2,512 Times in 1,502 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	Race clutch? Sounds like part of owning the clutch. If it's made for performance, then it's going to be lacking in the sound department. __________________ "Ah! What music! They could have never imagined, those pioneers who invented the automobile, that it would posses us like this, our imaginations, our dreams. Men love women, but even more than that, men love CARS!"-Lord Hesketh

04-14-2015, 03:00 PM	#6
cdrazic93 Junior Join Date: Aug 2013 Drives: a car Location: Probably at school Posts: 4,341 Thanks: 3,184 Thanked 2,512 Times in 1,502 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	That's sounds standard for clutch rattle. @CSG Mike, unless I'm wrong? __________________ "Ah! What music! They could have never imagined, those pioneers who invented the automobile, that it would posses us like this, our imaginations, our dreams. Men love women, but even more than that, men love CARS!"-Lord Hesketh

04-14-2015, 03:09 PM	#8
#maverick# Senior Member Join Date: May 2014 Drives: 2006 Pontiac GP (SOLD), 2014 FR-S Location: Chicago Posts: 378 Thanks: 296 Thanked 145 Times in 113 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Sounds like your driving a 6 puck clutch add in a lightweight flywheel and solid trans bushings and itll sound like its tearing itself apart. 6 pucks also dont particularly like low rpms haha, have it checked out by a shop if you're worried. __________________ "Project cars are like New Years Eve. Endless preparation, hype, a sleepless night of fun, followed promptly by massive headaches and regret." - Anonymous

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04-14-2015, 04:53 PM	#10
Shady195 Senior Member Join Date: Jun 2014 Drives: '13 10 Series FRS #1203 Location: Albany, NY Posts: 850 Thanks: 7 Thanked 386 Times in 221 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Welcome to the world of pucked clutches They make noise. Because Racecar. Side Note: There will come a point where you're really comfortable with that clutch and you will be able to roll off without any chatter.

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