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Old 11-05-2016, 05:51 PM   #1
Raptor89
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Default 2013 WRX Transmission Area Knock Noise

I've searched and searched, but still haven't found a solution. I'm TP stage 2 with Invidia catted DP and Q300 catback. Everything else stock. There is a rattling/knocking noise coming from below the shifter, slightly towards the front, in what sounds like the transmission area. All mounts are good, the CV joints are good, heat shields and exhaust bolts are snug. I'm out of ideas. I'm thinking transmission, because it directly occurs most of the time when downshifting (higher RPMs), going in reverse, and also going over bumps and making hard turns. It's almost like I can hear the transmission bucking? I'm at about 28k miles (only stage 2 for 3k), but it started shortly after going stage 2. Any ideas?

EDIT: It's the resonator rubbing against the underside of the car. See most recent reply below.
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Last edited by Raptor89; 01-20-2019 at 11:01 AM.
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Old 11-06-2016, 11:17 AM   #2
Raptor89
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After listening a bit closer, it sounds like it's coming from behind the radio in the engine bay possibly? The pitch stop mount is good though.
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Old 11-08-2016, 11:45 AM   #3
GalaxyBlueDude
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If you have a stock up-pipe, check the heat shield around it. They tend to get loose and make quite a racket.
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Old 11-08-2016, 12:29 PM   #4
Samurai Jack
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Do you have enough clearance between the exhaust and the transmission, body, etc.?

Should have minimum 1/2" to account for movement so you don't get any banging
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Old 11-08-2016, 01:21 PM   #5
vikramaditya1986
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Quote:
Originally Posted by GalaxyBlueDude View Post
If you have a stock up-pipe, check the heat shield around it. They tend to get loose and make quite a racket.
Yes this - I had the same thing happen to my 2011 WRX w/ Stage 2. At lower speeds when cruising around town I'd hear a loud metallic clanging/rattling which worried me quite a bit because I'd done a lot of work with the suspension and brakes and was concerned something to do them was loose. Turns out the uppipe heatshield had gotten loose after unbolting from the stock downpipe heatshield and was most likely the source of the racket because everything else on my car seemed nice and tight.
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Old 11-10-2016, 02:14 PM   #6
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Quote:
Originally Posted by vikramaditya1986 View Post
Yes this - I had the same thing happen to my 2011 WRX w/ Stage 2. At lower speeds when cruising around town I'd hear a loud metallic clanging/rattling which worried me quite a bit because I'd done a lot of work with the suspension and brakes and was concerned something to do them was loose. Turns out the uppipe heatshield had gotten loose after unbolting from the stock downpipe heatshield and was most likely the source of the racket because everything else on my car seemed nice and tight.
Bingo! I just drove a self-tapping screw through the shield to the other half and called it a day.

Hope this helped the OP!
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Old 01-28-2017, 05:36 PM   #7
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I'm a bit late, but thanks! I did take off the regular turbo heat shield and check around that area a bit. The up-pipe heat shield seemed snug, but I couldn't tell for 100% certain. The noise still persists. It happens when I go over bumps, and oddly is really loud when I go in reverse, but silent in all forward gears. It's in that general area, so that's probably what it is. I'm assuming the welds probably came loose? Would there be any harm done to just letting it go if that's what it is? These cars make so many noises, if that's all it is, it's not high on my priority list haha.
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Old 01-28-2017, 06:36 PM   #8
424wrx
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is your dowmpipe hitting the firewall where it goes under the car? most aftermarket dp are very close. also check the heatshield above the midpipe by the shift linkage.
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Old 01-30-2017, 05:57 PM   #9
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I don't think. The sound isn't coming from that far back/low.
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Old 01-30-2017, 11:17 PM   #10
Daijoubo-yo
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I had that problem with the Q300. Only happened in reverse and hard acceleration shifts. Check the rear crossmember and see if the exhaust is resting against it. You'll be able to see if it's hitting the crossmember. Mine had marks all over the piping where it was hitting.
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Old 06-17-2018, 12:44 PM   #11
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Sorry to bring up a thread from the dead, but I was away for a while for work and the noise is still there. Anyway, today I took apart the entire center console and drove around with the bare bones shifter showing, but that didn't solve anything other than I know that area isn't the problem. The sound didn't sound any different either.

It happens when I hit bumps, and/or make a hard right. Doesn't matter if I'm in gear or not. It will not happen when making a hard left, oddly. Here are a few videos I took. It can be heard better with the bass turned down (damn subie rumble lol).

Hard right turn, happens at about 7 seconds.

Hard right turn, 2nd gear at about 7 seconds. Ignore the sound of my key fob smacking against the plastic.

2nd gear, hard right turn at about 12 seconds.


I really want to put this to bed.

Last edited by Raptor89; 06-17-2018 at 01:03 PM.
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Old 06-19-2018, 10:31 PM   #12
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Default Crossmember bushings

I had a similar sound under similar circumstances when I first bought my 06 sti. Know what it ended up being? Transmission crossmember bushings. Apparently, a previous owner had removed them and didn't replace them, so it was hard metal on metal that made itself known after shifts, bumps, and hard turns. Perhaps yours are there but just worn out.

I ordered these:

https://www.rallysportdirect.com/par...mount-bushings

I replaced the transmission mount with a Group-N one while I was down there.

Fixed my noises.
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Old 06-23-2018, 08:56 PM   #13
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^ You might be on to something with that. I was under the car today and noticed how much movement the trans mount was allowing. I ordered the STi mount, Whiteline positive shift bushing kit, and a pitch stop mount while I was at it. Hopefully that puts this to rest. I appreciate the reply.
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Old 01-20-2019, 11:00 AM   #14
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So, I changed all the trans mounts and the sound still persisted. Turns out, the Q300 resonator is vibrating against the underside of the car. I did some research and read that Invidia's fitment can be hit or miss sometimes, and some people have even reported it rubbing against the driveshaft itself (luckily not me). I even took the entire DP and catback off to try and readjust everything, but no dice, that's just the way it sits.

The space between the resonator and the car is very minimal and the only thing that'll fit between is probably exhaust wrap or something similar. I bought a small high-temp rubber hose that I was going to shove between and call it a day, but even that's too big. I thought about replacing the exhaust hangars to stiffer ones, but there aren't really any in that area, so I feel it might not solve anything. What I'm thinking is clamping some sort of sound deadening matting or material around the resonator, like exhaust wrap, but in whole sheet form if that exists (I tried wrapping it, but the strips are too small and it came undone quickly). I just need something larger that can directly withstand exhaust temps and be weather resistant.

Any ideas, or even other alternatives?
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Old 02-24-2020, 07:22 PM   #15
Timmybiggs
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Default Same problem different sir cumstance.

All I did was put in a COBB stag One plus short throw shifter, after that following the instructions to a T as well as supporting the transmission in reversed first second gear and I canít tell the rest when I De-accelerate I get a horrible clunking noise coming behind the firewall. It sounds almost like something is catching on the drivetrain, or my front differential is misaligned, anyone else had an experience like this? Iím really trying to fix it because it doesnít sound good.
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