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Old 01-17-2021, 12:25 PM   #1
TheDudesSTi
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Member#: 398798
Join Date: Aug 2014
Chapter/Region: South East
Location: Grovetown
Vehicle:
2012 STi Hatchback
It's starting to itch...

Default Need help with this noise, losing my mind

So I've got less than 600 miles on my brand new IAG Stage 2 Tuff Block. And Ive had this noise since almost the beginning. I haven't found a thread or video anywhere that sounds exactly like my issue, so here goes. Tuner is kind of stumped, has suggested a few things, but nothing has changed it.

Less than 600 miles on IAG Stage 2 Tuff Block
New Parts with motor build
OEM oil pump
OEM thermostat
OEM idlers and timing tensioner
NGK LFR7AIX
Kelford 264 cams
GSC Valve Springs
Koyo Rad
Gates Blue Racing timing belt
FP Green turbo
Exedy STage 1 HD clutch kit
ARP Headstuds
IAG Oil Pick up tube
Group N Motor mounts
All new exhaust gaskets

Reused from old motor:
Tomei ELH
Invidia Catted DP
ID 1050x injectors
Crawford AOS
Cobb CAI
Perrin Fuel rails and regulator
OEM fly wheel (resurfaced)

The noise/rattle only happens after driving enough to get everything warm. Will not happen with cold motor. I've tried numerous times but can only get it to happen after a good warm up and 15 mins or so of driving. The sound only happens when accelerating from a stop, 1st gear only and going up hill, so with a little bit of load I guess. And the noise only happens between 1500-2100 rpms or so and then goes away. If I accelerate from a stop on flat or downhill I don't hear it. The noise does not cause any noticeable vibration in floor, pedals, shifter or steering wheel. Oil pressure at cold idle, warm idle and cruising is within spec. And no oil pressure drop when noise occurs. Originally thought it was timing tensioner, replaced with another OEM tensioner, with no luck. Still on Motul Breakin 10w40 oil per IAG guidelines. I've also checked for anything loose in the engine bay, got under there and shook thee hell out of everything even smacked on some stuff with a dead blow and couldn't replicate the sound. Open to any suggestions.

Need help before I scrap this $10k motor build and sell the car for scrap.

This camera view is from the passenger side mounted to the uni body frame right next to the valve cover/header. Timestamps for the noise so you aren't listening to the entire thing.

15:04, 15:59, 16:29, 16:39, 16:50, 17:00, 18:10, 21:20, 21:28, 21:38, 21:53, 23:53, 24:00, 24:08, 24:32, 24:47, 26:44, 31:16, 31:24, 31:33, 31:43, 31:58, 33:58, 34:07, 34:17, 34:27

Also took a video from the driver side in the exact same spot, but dont' have enough space in my googledrive for both videos. If someone wants to hear that one as well, let me know and I'll figure out a way to upload it somewhere.

https://drive.google.com/file/d/16vD...ew?usp=sharing
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Old 01-18-2021, 08:27 AM   #2
BlackFighter
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Member#: 193940
Join Date: Nov 2008
Location: Philly
Vehicle:
2004 WRX STI Black
RalliSpec Shortblock

Default

I want to say valvetran. Who did the head work?
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Old 01-18-2021, 09:24 AM   #3
TheDudesSTi
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Member#: 398798
Join Date: Aug 2014
Chapter/Region: South East
Location: Grovetown
Vehicle:
2012 STi Hatchback
It's starting to itch...

Default

Quote:
Originally Posted by BlackFighter View Post
I want to say valvetran. Who did the head work?
Machine shop a couple hours away that has done dozens of subaru heads for the builder that helped me put it all together. Did the oil changes at 50 and 500 miles and they both had a good deal of "glitter" in them, but all were very fine and uniform size. No chunks. Pretty sure that's normal still at the 500 mile mark on a new motor.

I've had some suggest it's possibly the resurfaced fly wheel or just a bad clutch kit as it only seems to happen in that low RPM range of engagement with the fly wheel. With so many brand new parts in the engine bay I just feel like that should rule out a lot of things, but some have told me they've had plenty of brand new parts just end up as a bad egg.
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Old 01-18-2021, 11:18 AM   #4
TheDudesSTi
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Join Date: Aug 2014
Chapter/Region: South East
Location: Grovetown
Vehicle:
2012 STi Hatchback
It's starting to itch...

Default

Driver Side video with timestamps

https://drive.google.com/file/d/1AHJ...ew?usp=sharing

0627, 0637, 0647, 0701, 0901, 0911, 0922
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Old 01-18-2021, 11:46 PM   #5
dpoole99x
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Location: Kansas city
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2018 Subaru WRX
Black

Default

I have the same noise kinda like a head shield rattle. almost but a ticking, i have external wastegates. sometimes it will happen and it sounds bad when in a drive threw been chasing this for over a year now. even thought it was my turbo. got a new one and it still does it i think my flapper on the hot side of the turbo isnt sealed right
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Old 01-19-2021, 08:24 AM   #6
Nadles
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Default

It sounds like it's near the flywheel. I had a similar sound after we did my built motor and clutch 3 years ago. My clutch was engaging really weird too though. We redid my clutch and flywheel and the problem was never eliminated unfortunately but it does seem to happen less. I chalked it up to coincedence.

Hopefully, it isn't the valvetrain.
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Old 01-19-2021, 03:35 PM   #7
TheDudesSTi
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Member#: 398798
Join Date: Aug 2014
Chapter/Region: South East
Location: Grovetown
Vehicle:
2012 STi Hatchback
It's starting to itch...

Default

Quote:
Originally Posted by Nadles View Post
It sounds like it's near the flywheel. I had a similar sound after we did my built motor and clutch 3 years ago. My clutch was engaging really weird too though. We redid my clutch and flywheel and the problem was never eliminated unfortunately but it does seem to happen less. I chalked it up to coincedence.

Hopefully, it isn't the valvetrain.
Your "weird" clutch engagement. Can you elaborate? Was clutch engagement insanely low? like in the 1st 1/2 inch of pedal travel?
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Old 01-19-2021, 03:37 PM   #8
TheDudesSTi
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Member#: 398798
Join Date: Aug 2014
Chapter/Region: South East
Location: Grovetown
Vehicle:
2012 STi Hatchback
It's starting to itch...

Default

Quote:
Originally Posted by dpoole99x View Post
I have the same noise kinda like a head shield rattle. almost but a ticking, i have external wastegates. sometimes it will happen and it sounds bad when in a drive threw been chasing this for over a year now. even thought it was my turbo. got a new one and it still does it i think my flapper on the hot side of the turbo isnt sealed right
I'm running a brand new FP green with internal wastegate. Haven't even spooled it since I'm still in the break-in phase.
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Old 01-19-2021, 04:01 PM   #9
subaru_gc8
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silver

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I see in there you did cams, so did they adjust the valve lash?
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Old 01-19-2021, 04:15 PM   #10
TheDudesSTi
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Member#: 398798
Join Date: Aug 2014
Chapter/Region: South East
Location: Grovetown
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2012 STi Hatchback
It's starting to itch...

Default

Quote:
Originally Posted by subaru_gc8 View Post
I see in there you did cams, so did they adjust the valve lash?
They did. They went off the specs on the card that came with the cams from IAG/Kelford
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