High pitch noise in 6th gear
 

Hi,
In 6th gear (MT) between 72 and 80 mph (3200-3700 rpm?), there is a high pitch ringing only when I'm on the throttle. It's hard to tell if the noise happens when it lower gears at that rpm because the engine noise is louder. Anybody else have that problem?

Engine is completely stock. Just hit 45,000 miles. It does it on all roads. Tire pressure is fine. I don't know if it has always done it or I have just started noticing. I bought it with 28,000 miles on it.
Thank you

Hi,

Do you have any power mods .. ??

Miles on your car .. ??

Does it do that just on certain roads .. ??

Have you checked your tires pressures .... ??

Did it just start doing that .. ??

Come back.

:)


humfrz

Edited original post. Sorry for the lack of information.

Thanks for the additional information......:thumbsup:

It could be several things:

* you just started noticing it ...... ;)

* transmission gear whine

* differential gear whine

I would suggest that you check/change the transmission fluid. Check/change the differential fluid. Even if that doesn't "cure" it ....... at 45,000 miles, it sure wouldn't hurt.


humfrz

I noticed this exact same thing at that speed/RPM range on my 2016 brand new FR-S during my first week of ownership, so I think it's normal. Most likely gear whine?

I changed the transmission and diff fluid with Motul gear 300 at 30,000 miles.

If it's normal, then it's kinda a bummer considering those are freeway cruising speeds/rpms

How loud is the whine? I'll actually have to try to pay attention to mine on the way home and see if I notice anything. If it is normal and the whine isn't too loud, you could get an aftermarket cat-back exhaust and just overpower the whine.

Mine does that and always has. I'm at 67k. The whine is not loud at all and only if you hold that rpm for a couple of seconds. I don't think it's anything to worry about. I also had my trans fluid changed at 60k with mogul gear 300. It goes away if you drive at 3k rpm or like 3.5k rpm. I also think it's a gear whine. You have you have things pretty quiet to even hear it, any music or loud cars near you can make it impossible to hear.

Well then, it's most likely gear whine. My 2013 FR-S doesn't do it ..... or I can't hear it.........:iono:

Back-in-the-day, when gears would whine ...... we would just put heavier oil in the case, till it would shut up.....:thumbsup:


humfrz

Hmmm.......I used to get that whine all the time but you may be correct I haven't noticed a bit of it since my cat-back install. :w00t:

Mine would whine too. I think it's common for all cars. My Corolla and Fiesta had it too. You have to be higher than 3000 RPM to hear it. I usually hear it in 78+mph to notice it. You should be fine tho.

2013 Scion FRS @Exrald.frs

Sounds like a turbocharged supercharger thingy ...

My BRZ has faint little whine (or ringing) in 6th as well.. Seems normal to me. I kind of like it TBH.

So during my drive home yesterday I didn't notice any transmission or differential whine. However, I have a Invidia N1 Cat-back exhaust which is one of the louder exhausts for our vehicles. So my vehicle is probably not the best to use as a reference.

Do you think it's a mechanical sound or it's more like an electrical sound? Sometimes mine makes a buzzing noise that seems to be asociated with revs, definitely an electric sound that comes from under the sterring wheel.

It is very high pitched. I'm 23 and I know that when you get older you can't hear high pitch noises. It's that high pitched to where I don't think older people can hear it. I can't tell what area of the car its coming from

SAY WHAT ??



Oh, just wait a few years, the whine will go away ..... ;)


humfrz

I got the same whine going in in my brand new 2017 Brz series yellow. Completely stock. Not sure if I just noticed it or if always been. Only got 1.3k miles on it. So perhaps it's always there? I'm normally always blasting music so maybe that's why I didn't notice. U can't hear it if ur playing music at a medium setting

Sent from my SM-G950U using Tapatalk

I thought I had overwhelmed it with this, I made a muffler delete. But I can still hear it. Do you think trying a different transmission oil will help this? Redline or something?

Sure it isn't the diff? Many people are not used to the sounds they make.
Oil may help but your best bet would be to add some sound proofing material to the floor and tunnel. These cars are pretty much carpet the consistency of a Kleenex laying on top of bare metal which allows a number of noises that are not normally heard come out and play.

I have no idea what it is. I don't know what gear whine vs diff whine is. I have considered that but don't really know anything about sound proofing either. I'm game to try it tho. I have a free weekend this weekend.

It isn't hard to do but does take some time and will add a bit of weight. The weight is well spread out though. You would just need to concentrate on the floor, tranny tunnel and trunk.
http://www.ft86club.com/forums/showthread.php?t=53511
http://www.ft86club.com/forums/showthread.php?t=35604

Great, thanks for the information.

from OP's description think this is normal. my 6th gear has always had the faintest whine from day one, though i only notice it under the right conditions..usually has to be around 70-80 mph on a relatively smooth highway.

post up a video. if it is too faint to catch on video then it is most likely the aforementioned whine..

When I got the car I really thought I was crazy but yes that thing is REALLY annoying. It happens when I am cruising at freeway speeds and also when pushing throttle a little more. When I stop pressing the throttle and let it coast, the sound stops too. I don't hear it anymore since I have an exhaust but I am sure it is still there. Not sure what it is though. My guess is fuel pump, or just lack of refinement in these cars, as I can notice a lot of weird rattling and stupid noises haha.

Yep. It is not a Jag, BMW nor a Lexus so you hear everything.

My 2013 frs does it aswell like everyone else either says it does it and they can or can’t hear it or theirs don’t just seems like some people can hear better because I have my car with catless front pipe and a Manzo resinator besides that no mufflers with stock headers and I can still hear it from time to time

There's an internal resonance in the stock diff right around 75 mph. It's barely noticeable with the stock mounts but it's there.