Heavy "Shuttering" When Starting in 1st Gear - Page 4 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

BrahmaBull1990 · 09-23-2021, 12:58 PM

Sounds dumb, but have you checked tire pressure? With the cold weather, tires are flatter; more rolling resistance to get going. If you’re used to a certain throttle to roll and your tires are low, you will stutter.

Lantanafrs2 · 09-23-2021, 01:57 PM

Does it shudder with the traction control off?

jeepmor · 09-25-2021, 01:39 AM

Quote:

Originally Posted by eman11500

Hard slip the clutch at a higher RPM and then re-engage as soon as it drops and hold it for a while? Or should I just hard slip and give it some oomph a couple times?

I slipped my new clutch at above street speeds in those acceleration zones. It helped quite a bit, but it still happened once in a while. But I pretty much doubled the clamping power with my new clutch changing engagement torque beyond the system's design.

My issue came on with a new clutch as well, before my supercharger. What's happening is the bushings aren't tuned for higher sudden torque input, so they over deflect and wind up enough to kick back their energy. Stiffer bushings deflect less and don't kick back as hard. But you gain NVH as they transfer that stiffness into body more. Especially motor mounts

Great feeling to have them stiffer though, the hysteresis on and off power is twitchy again. Came with the most NVH for the dollar, but I do like how it drives quite a bit better now too.

jeepmor · 03-01-2022, 11:39 PM

Quote:

Originally Posted by eman11500

So should I , or should I not do the insert? I'm somewhat confused

I missed you were all stock in replacement, did you figure out your problem yet? To go from stock to mods and have issues is one thing, but stock to stock, you shouldn't have any change. I'm with Ultramaroon on that one. Catching up on most the reading, it does sound like the flywheel might be burned up a bit. Sounds like it may not have been changed. Thrashing would help seat in with the new disc better and maybe just wear its own groove in and be fine. My settled a bit after the thrashing as well.

On my rig, it's been a while now, but I can still induce the shudder. It's parking lot speeds where I have to feather the clutch a lot, the rear still starts shuddering. On my clutch job, I put in a new subi flywheel. My old one looked a little worn, but wasn't awful. My TOB failed, not my clutch. And I had a SC coming, so I bumped up the clutch strength to stage two and all new parts. Clutch is overkill at 350 ft-lbs, but feels the same weight as the stock clutch foot work wise. But it snaps closed much harder than the stock one, which is where I honestly think my issue came from.

After my experience with mods, and reading your same experience with stock components. I think you need(ed) more wear in time to reset the sliding patch of the new parts. I see the thrashing and slipping the clutch accelerate the burn in process. Especially if a used flywheel already worn into to another clutch pack. Those are smooth compared to new parts and will take a little longer to seat in.

jeepmor · 12-04-2022, 08:17 PM

My issue ended up being a Verus fork having sloppy tolerances. Took me 30k miles, but I had it opened back up by a performance shop and they shared that they have seen it several times with Verus forks.

Ultramaroon · 12-04-2022, 08:46 PM

Quote:

Originally Posted by jeepmor

My issue ended up being a Verus fork having sloppy tolerances. Took me 30k miles, but I had it opened back up by a performance shop and they shared that they have seen it several times with Verus forks.

That's a damn shame but it makes sense. Stock fork design isn't stellar but I've always argued that it's strong enough.

sato · 12-04-2022, 09:32 PM

Quote:

Originally Posted by jeepmor

My issue ended up being a Verus fork having sloppy tolerances. Took me 30k miles, but I had it opened back up by a performance shop and they shared that they have seen it several times with Verus forks.

What problems could the "sloppy" tolerances cause? Just asking.

x808drifter · 12-06-2022, 09:46 AM

Make that 3rd now...

Ultramaroon · 12-06-2022, 12:13 PM

Quote:

Originally Posted by x808drifter

Make that 3rd now...

I feel dumb for walking right into it all. Forum-ers, please forgive me.

Spuds · 12-06-2022, 06:00 PM

Quote:

Originally Posted by jeepmor

My issue ended up being a Verus fork having sloppy tolerances. Took me 30k miles, but I had it opened back up by a performance shop and they shared that they have seen it several times with Verus forks.

Sounds like that "performance" shop has a habit of installing clutches wrong, considering nobody else has had any issues.

StraightOuttaCanadaEh · 12-07-2022, 11:45 AM

My car was doing this recently and I installed the front and rear diff bushing inserts and it's doing it a lot less now. It was almost like it was struggling for traction, very strange. Installing bushings or stiff mounts at one end and not the other exacerbates this problem

jeepmor · 12-07-2022, 05:24 PM

Quote:

Originally Posted by Spuds

Sounds like that "performance" shop has a habit of installing clutches wrong, considering nobody else has had any issues.

Sounds like someone doesn't know how these clutches go together, there is no adjustment. The performance shop fixed it, not the installation shop. The performance shop stated they did not find anything incorrect about the installation, just the Verus fork. To which they added they had seen this be a problem with this component before. They claim high wear, but mine was an issue from day one of Verus fork installation.

Spuds · 12-07-2022, 07:54 PM

Quote:

Originally Posted by jeepmor

Sounds like someone doesn't know how these clutches go together, there is no adjustment. The performance shop fixed it, not the installation shop. The performance shop stated they did not find anything incorrect about the installation, just the Verus fork. To which they added they had seen this be a problem with this component before. They claim high wear, but mine was an issue from day one of Verus fork installation.

You can adjust the pedal and thus throw out bearing travel pretty easily though.

NoHaveMSG · 12-07-2022, 08:09 PM

Quote:

Originally Posted by jeepmor

Sounds like someone doesn't know how these clutches go together, there is no adjustment. The performance shop fixed it, not the installation shop. The performance shop stated they did not find anything incorrect about the installation, just the Verus fork. To which they added they had seen this be a problem with this component before. They claim high wear, but mine was an issue from day one of Verus fork installation.

Which shop? What has Verus had to say? PRE, AR?

09-23-2021, 12:58 PM	#43
BrahmaBull1990 Howdy Join Date: Feb 2021 Drives: 2020 BRZ PP Location: Snohomish, WA Posts: 589 Thanks: 1,271 Thanked 446 Times in 248 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Sounds dumb, but have you checked tire pressure? With the cold weather, tires are flatter; more rolling resistance to get going. If you’re used to a certain throttle to roll and your tires are low, you will stutter. __________________ There's a point at 7,000 RPM... where everything fades. The machine becomes weightless. Just disappears. And all that's left is a body moving through space and time. 7,000 RPM. That's where you meet it. You feel it coming. It creeps up on you, close in your ear. Asks you a question. The only question that matters. Who are you?

12-07-2022, 11:45 AM	#53
StraightOuttaCanadaEh Wes Join Date: Feb 2017 Drives: Artisan Spirits '17 86 Location: Toronto Posts: 2,794 Thanks: 1,165 Thanked 1,674 Times in 994 Posts Mentioned: 21 Post(s) Tagged: 0 Thread(s)	My car was doing this recently and I installed the front and rear diff bushing inserts and it's doing it a lot less now. It was almost like it was struggling for traction, very strange. Installing bushings or stiff mounts at one end and not the other exacerbates this problem __________________ Instagram: @gt86ws

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