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Old 12-16-2012, 12:16 PM   #1
fiatlux
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Default New STI owner, buzzing noise from drivetrain in 2nd gear. Normal?

I just picked up my new 13 STi yesterday, and I've been noticing a buzzing noise under engine braking in 2nd gear at around 2000-2500 RPM (i.e. cruising to a stop while in gear). It's not really a grinding noise, but some sort of weird buzz that sounds like it's coming from underneath the car. Anyone else experience this, and is it normal?

On a separate note, I've noticed even at 60MPH in 6th gear if I floor it the car barely accelerates. Is that normal? I came from a BMW with a nice straight-6. In that thing at the same RPM and speed I'd have pretty good oomph in top gear. Am I just in too high a gear in the STI? In the city I can barely keep it in 5th; usually to get anything out of the engine I have to downshift to 4th or 3rd (or even 2nd at lower speeds).
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Old 12-16-2012, 12:21 PM   #2
nightdown fox
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Welcome. Are you new to turbo cars? (i.e. was that straight six you mentioned naturally aspirated?)
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Old 12-16-2012, 12:30 PM   #3
Gomes316
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The 6th gear is mostly for fuel economy bud. For good acceletation you. An probably downshift to 4th or 5th for a good boost. Feel free to correct me if im wrong
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Old 12-16-2012, 12:34 PM   #4
goregasm
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Look up turbo lag.
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Old 12-16-2012, 12:36 PM   #5
gregonfire
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Although I don't have the 6 speed, I experience the same thing at highway speeds. I usually downshift to 3rd or 4th (depending on speed), and go from there. You won't really get good acceleration unless you're at 3k rpm or higher.
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Old 12-16-2012, 12:46 PM   #6
Loyale93
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Quote:
Originally Posted by goregasm View Post
Look up turbo lag.
That answers your second question.

As for the first, post a video if you can.

And fill out your profile.
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Old 12-16-2012, 01:18 PM   #7
scx89
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#1 happens to me
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Old 12-16-2012, 01:30 PM   #8
MaddMax
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Do you guys have STI shifters with SPT rear shifter bushing? I installed the SPT rear shifter bushing in my WRX and it cold weather (20s) it causes some in gear squeaking. The fix is greasing the shifter support rod as it rubs on the hardened bushing when temps drop.
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Old 12-16-2012, 01:57 PM   #9
RoadKillDMD
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That 'buzzing' sound is probably just the load on your transmission from engine braking. Really nothing to worry about, unless it is a LOUD buzzing. This sound gets much louder if you upgrade the shifter bushings, tranny bushings, and/or tranny mount.

As for no power in 6th @ 60mph, like others have said, look up turbo lag. Your engine is producing very little boost at low RPM, so you have no torque. Shift to a lower gear before pushing the accelerator.

Quote:
Originally Posted by Gomes316 View Post
The 6th gear is mostly for fuel economy bud. For good acceletation you. An probably downshift to 4th or 5th for a good boost. Feel free to correct me if im wrong
6th gear is definitely not an economy gear. In fact, the final drive ratio in the STI is storter than the WRX.
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Old 12-16-2012, 02:46 PM   #10
heavyD
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Make sure you don't have the car in Intelligent mode. I can't believe how horrendous the drivability is in Intelligent. The car just bogs, sputters, and feels week. Have to be in Sport mode for decent drivability and response.
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Old 12-16-2012, 03:08 PM   #11
Mr Wrex
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Is that buzzing sound you hear the sound of straight cut gears? An audio recording would help us better understand what you're referring to
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Old 12-16-2012, 03:36 PM   #12
Navendra94
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Question #2 = Turbo lag. Down shift :P
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Old 12-16-2012, 03:43 PM   #13
chet24
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The buzz is most likely a heat shield rattle. Look it up, it is very common on Subarus. Basically when the exhaust pipes vibrate, it hits/causes the heat shield I vibrate. I have had the same thing on both my 08 Impreza and my 09 WRX. Possible solutions if this is the case are a new exhaust heat shield from factory, get it tack welded at any exhaust shop, or get under there with some pliers, look for close/barely touching surfaces and either join them more or separate them. I went with the 3rd option. It can take some tweaking a couple times, but some tapping on the shields should sound familiar and should be able to point you to trouble spots.

The dealer would probably take care of it for you if you took it in. They did on my mom's tribeca when it was still covered under warranty.
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Old 12-16-2012, 06:49 PM   #14
russ9127
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Quote:
Originally Posted by chet24 View Post
The buzz is most likely a heat shield rattle. Look it up, it is very common on Subarus. Basically when the exhaust pipes vibrate, it hits/causes the heat shield I vibrate. I have had the same thing on both my 08 Impreza and my 09 WRX. Possible solutions if this is the case are a new exhaust heat shield from factory, get it tack welded at any exhaust shop, or get under there with some pliers, look for close/barely touching surfaces and either join them more or separate them. I went with the 3rd option. It can take some tweaking a couple times, but some tapping on the shields should sound familiar and should be able to point you to trouble spots.

The dealer would probably take care of it for you if you took it in. They did on my mom's tribeca when it was still covered under warranty.
The variation of option number three is bang the life out of the heatshield with a crowbar and a hammer so its bent up enough where there is no way it will hit the exhaust. I had to do this when I put my downpipe in. I also put dynomat on sections of the exhaust that were near the heatshield. Its been 40k miles and it is still there!
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Old 12-17-2012, 11:57 AM   #15
mclrn227
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I've had my '13 WRX for two months and I also hear a metallic buzz/rattle when engine braking in 2nd. If I'm on the throttle it's fine, though. I was aware of the heat shield threads on here but I don't mind the noise. I figure it's just part of the sounds of my steed. She likes to whine and growl, so I let her.
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Old 12-17-2012, 12:31 PM   #16
Gallo2011
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Keep in mind, OP, you have a center differential you didn't have in your BMW. I hear the same sort of noise as I engine brake in lower gears. Perfectly normal. I suggest reading your owner's manual. All kinds of new sounds and such to learn about. Many are mentioned in the manual.

Fifth gear is the highway passing gear I use frequently. Sixth is for cruising at highway speeds and shouldn't be used for passing unless you have plenty of time. For best performance, keep your revs at about 3-3.5K, especially if you anticipate needing to accelerate quickly. Any lower than that and the engine isn't in it's optimal torque range and will feel sluggish. And as was mentioned, Intelligent mode is awful for any sort of spirited driving. I keep mine in S# most of the time. Doesn't mean you have to flog the car just because you're in S#. It just responds better when you do put your right foot down.
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