Originally Posted by cat94 (Post 3144952)

I guess rattle isn't really the best word, but it definitely sounds metallic, and not a normal souding buzz.

I find that when the sound does happen, and I'm rolling onto the throttle gently the sound is actually louder. However, it is easier to reproduce when jabbing the throttle.

Originally Posted by DaBoBo21 (Post 3145723)

https://youtu.be/g7C5jONDjgo

This is a clip of my BRZ from over a year ago. Excuse the exhaust, but is this the noise you're referring to?

Originally Posted by cat94 (Post 3146229)

Not quite, it sounds exactly the sound in this video 1:00 & 1:40.

https://www.youtube.com/watch?v=iuEw...ature=youtu.be

Originally Posted by cat94 (Post 3143678)

Hello,

I have a 2017 stock 86, and I've noticed in the last couple of months a rattle that's starting to concern me.

When cruising at around 2.5-2.8k rpms completely off the gas, the moment I start accelerating there is a brief (<0.5s) metallic sounding rattle/grinding noise. The sound is louder when the windows are down. Also, it doesn't always happen. Sometimes it is extremely noticeable, and I can consistently reproduce the noise. Other times it is very quiet, or doesn't happen at all.

Every gear will cause the rattle, but I've noticed that higher gears are worse. My guess is because higher gears take slightly longer to leave the RPM range of the rattle.

I'm planning on taking the car in under warranty for a squeaky clutch, and want to explain this problem too. Has anyone ever experienced something like this?

Originally Posted by Jordanwolf (Post 3146523)

This sound exists in every single 2017+ manual 86/BRZ I have driven. Toyota Canada, as far as I know is deeming this a non-issue until further....very, very casual investigation finds it, or a customer can pinpoint the issue with evidence.

Source, going to Toyota basically since I've gotten my car over and over and calling head office over and over.

Originally Posted by Bonburner (Post 3146323)

Isn't that the sound of the LSD?

Originally Posted by Jordanwolf (Post 3146523)

This sound exists in every single 2017+ manual 86/BRZ I have driven. Toyota Canada, as far as I know is deeming this a non-issue until further....very, very casual investigation finds it, or a customer can pinpoint the issue with evidence.

Source, going to Toyota basically since I've gotten my car over and over and calling head office over and over.

Originally Posted by RZNT4R (Post 3146603)

How do you think a torsen lsd works?

Originally Posted by RZNT4R (Post 3146718)

That's a torsen type a that does have a bit more gear lash than the type b used by the 86, but it would never be this loud, heck, a G80 locker isn't this loud

Originally Posted by Bonburner (Post 3146891)

we have no sound deadening besides 1 pad on each side of the rear quarter panel. I hear rock rattles in this car. I hear the transmission gear rattling, why not the LSD rattle?

https://www.youtube.com/watch?v=5WdySzQtSSA

Ultimately same situation. Gears in standing motion until sudden input causing adjustment in torque transmittance which may be causing the rattle.

At least for me, that's the direction the noise seems to be coming from.

Originally Posted by RZNT4R (Post 3146901)

If you'd've been reading what I posted, you'd know the sound is resonating in the engine block because I've been using a DSO on the knock sensors to pick it up.

If you're telling me rattle from the gear lash in the diff isn't getting lost in the super soft diff bushings, is making it's way up the driveshaft, through the transmission, through the sprung clutch hub and is showing up on the knock sensors clear as day,

http://i67.tinypic.com/s0x8hx.jpg

Fine, but do more than just throw the idea out there, test and investigate. At least I'm doing real tests to find it.