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Old 11-18-2012, 11:42 AM   #1
sportsman
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Member#: 298911
Join Date: Oct 2011
Location: santa cruz ca
Vehicle:
2011 STI
black

Default 2011 STI Grinding

So i have had my shifts from first to second grind a few times lately. It only happens when i accelerate hard and shift quickly, if i make sure to wait a split second to shift all is well. Any other gear is fine to just bang it in.

Has anyone had any syncro issues with the six speeds?

Ooh yea the car is stock no mods.
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Old 11-18-2012, 12:21 PM   #2
Shortpersonbk
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Join Date: May 2012
Chapter/Region: MWSOC
Location: Michigan
Vehicle:
91 Miata
slow sti 11.4 124

Default

your going to have issues with any transmission if you just sit there and grind gears all day..but if you have done it a few short times u should be fine, best thing to do would be not to ricer shift on the street and just take your time and do it smoothly
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Old 11-18-2012, 12:33 PM   #3
FuJi K
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Location: St. Paul, MN
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MY99 GF4 JDM 6spd
NF Performance

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I'm seeing more and more if this. Longer gear spacing now vs what it used to be.
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Old 11-18-2012, 01:28 PM   #4
RoadKillDMD
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Member#: 284792
Join Date: Jun 2011
Chapter/Region: RMIC
Location: Vanilla Valley, CO
Vehicle:
2011 STI
Plasma Blue Pearl

Default

Listen to posts #2 and #3. I've been dealing with the same issue. Have you changed your tranny fluid yet? I switched to motul 300 75w90 gear oil and it helped, but didn't completely fix the problem.

Along with the longer gearing, your driveline is all mounted on 'comfy', squishy bushings. Going WOT causes your engine and tranny to torque over just slightly due to these bushings. You may want to invest in a few things to tighten up your driveline and reduce the slop that is one of the main culprits of your problem:

Motor mounts

Pitch stop mount

Tranny mount

Tranny crossmember bushings

Look for these items, preferably with polyurethane bushings, stay away from rubber. Install them and report back!
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Old 11-18-2012, 01:57 PM   #5
trev762
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Member#: 280572
Join Date: Apr 2011
Chapter/Region: E. Canada
Location: southern ontario canada
Vehicle:
2011 sti sedan
plasma blue pearl

Default

Quote:
Originally Posted by RoadKillDMD
Listen to posts #2 and #3. I've been dealing with the same issue. Have you changed your tranny fluid yet? I switched to motul 300 75w90 gear oil and it helped, but didn't completely fix the problem.

Along with the longer gearing, your driveline is all mounted on 'comfy', squishy bushings. Going WOT causes your engine and tranny to torque over just slightly due to these bushings. You may want to invest in a few things to tighten up your driveline and reduce the slop that is one of the main culprits of your problem:

Motor mounts

Pitch stop mount

Tranny mount

Tranny crossmember bushings

Look for these items, preferably with polyurethane bushings, stay away from rubber. Install them and report back!
Lol I have a full whiteline bushing kit plus group N motor, tranny and pitch stop mounts. I'm having the same issue as we speak so its not bushing related and in the process with Subaru figuring this out. So far they feel either the throw out bearing or something to do with the tranny will post once we figure this issue out.

Hey op when u shift into 2nd before letting out the clutch do u feel a little bit of a clunk and binding feeling.

Just to give more info here that I've had lots of track days (circuit) never done quarter mile not even launched my suby as much as Ive wanted to but not my style of fun.
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Old 11-18-2012, 02:08 PM   #6
sportsman
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Member#: 298911
Join Date: Oct 2011
Location: santa cruz ca
Vehicle:
2011 STI
black

Default

No matter what i do i always feel a little bite when shifting from first to second.

I have 40k on the car now so i will be doing a trans fluid change i hope this helps.

My throughout bearing has been replaced (Whole other issue) this did not improve the shifting.
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Old 11-18-2012, 02:16 PM   #7
trev762
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Join Date: Apr 2011
Chapter/Region: E. Canada
Location: southern ontario canada
Vehicle:
2011 sti sedan
plasma blue pearl

Default

Quote:
Originally Posted by sportsman
No matter what i do i always feel a little bite when shifting from first to second.

I have 40k on the car now so i will be doing a trans fluid change i hope this helps.

My throughout bearing has been replaced (Whole other issue) this did not improve the shifting.
Well that's nice to know but what ever u do don't put the semi synthetic motul cuz that's what started this issue to begin with. Had it in my11 sti for 3k before dumping it out and went with motul competition only cuz they were out of gear 300. It helped alot once the tranny was warmed up but still think there is more going on and think its more to do with the center diff than a syncro but could be wrong lol. I think this is going to be a lengthy process but Subaru is on it more than I thought they would be so I'm grateful for that
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Old 11-26-2012, 11:15 AM   #8
esp1818
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Member#: 338585
Join Date: Nov 2012
Default

I have the exact same problem on my 09 STi with 76000km on it. The only time it happens to me is when it's below freezing out and the tranny hasn't warmed up yet. Once I've driven it for a bit it stops grinding. I thinking its a syncho issue but I'm not sure. I will be taking it to Subaru when it's colder outside (at least -20c) so it's easier to replicate the problem.
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Old 11-26-2012, 02:19 PM   #9
BlackFighter
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Member#: 193940
Join Date: Nov 2008
Location: Philly
Vehicle:
2004 WRX STI Black
RalliSpec Shortblock

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Hope I dont have this issues with the longer gears upgrade in my 04 sti
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