What is this noise? Brake 'lsd'? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

imnotsureaboutbrz · 07-10-2017, 02:00 PM

I had this posted in the track forum but thought I might get more feedback here.

So first of all everything below is about the 2017 BRZ with the newly configured traction/stability control system. Below in the manual it states that if you hold the 'off' button for 3 seconds it disables traction and stability control AND in a manual car the Brake LSD is also disabled (i.e. no need for pedal dances).
https://view.joomag.com/subaru-brz-m...028204?page=11

So...

I've heard this noise at a couple of events but this is the best one that got captured on video. I'm running my 2017 Brz with Traction Control 'OFF' which I thought disables the brake lsd thing? So what do you think it is? It can be heard at: ~:35 and ~:45

[ame="https://www.youtube.com/watch?v=Ao3HYMnGQhk"]July 9th Alaska SCCA Autocross C-Street 2017 Subaru BRZ - YouTube[/ame]

mav1178 · 07-10-2017, 02:02 PM

your ABS is kicking in.

Only way ABS is disabled on this car is if you pull the ABS fuse.

Pho20 · 07-10-2017, 02:04 PM

Vsc is still enabled you need to do the pedal dance

http://thenewswheel.com/how-to-unloc...ur-subaru-brz/

imnotsureaboutbrz · 07-10-2017, 02:28 PM

Quote:

Originally Posted by Pho20

Vsc is still enabled you need to do the pedal dance

http://thenewswheel.com/how-to-unloc...ur-subaru-brz/

VSC is disabled in this mode see page 102
https://stis.subaru.com/proxy/125807...706ASTIS_5.pdf

imnotsureaboutbrz · 07-10-2017, 02:29 PM

Quote:

Originally Posted by mav1178

your ABS is kicking in.

Only way ABS is disabled on this car is if you pull the ABS fuse.

I was thinking that may be it, but why is it engaging? is it a function of the Brake LSD? I have braked HARD (in straight lines) in this car and have not had the abs kick in before

mav1178 · 07-10-2017, 02:37 PM

Quote:

Originally Posted by imnotsureaboutbrz

I was thinking that may be it, but why is it engaging? is it a function of the Brake LSD? I have braked HARD (in straight lines) in this car and have not had the abs kick in before

Braking + turning in.

Your tires can only give you so much traction... if you are braking then turning in, the changes in wheel speed will make the car think you are locking up your wheels.

If pedal dance (diagnostic mode) does not resolve this behavior, you just need to learn to drive smoother to not engage this.

Pho20 · 07-10-2017, 02:41 PM

Quote:

Originally Posted by imnotsureaboutbrz

VSC is disabled in this mode see page 102
https://stis.subaru.com/proxy/125807...706ASTIS_5.pdf

Even when it's "off" parts of it are still on the only way to turn it off completely is to do the pedal dance

http://www.ft86club.com/forums/showthread.php?t=25494

imnotsureaboutbrz · 07-10-2017, 02:54 PM

Quote:

Originally Posted by mav1178

Braking + turning in.

Your tires can only give you so much traction... if you are braking then turning in, the changes in wheel speed will make the car think you are locking up your wheels.

If pedal dance (diagnostic mode) does not resolve this behavior, you just need to learn to drive smoother to not engage this.

that kinda makes sense... I really thought I could avoid the pedal dance non-sense by going with a 2017 model... I guess we will see next month if I feel/hear any differences at the next event.

Mods please close

Tcoat · 07-10-2017, 03:01 PM

Quote:

Originally Posted by imnotsureaboutbrz

Mods please close

Good luck!

07-10-2017, 02:00 PM	#1
imnotsureaboutbrz Senior Member Join Date: Jan 2017 Drives: between cars... Location: Ohio Posts: 498 Thanks: 192 Thanked 263 Times in 158 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	What is this noise? Brake 'lsd'? I had this posted in the track forum but thought I might get more feedback here. So first of all everything below is about the 2017 BRZ with the newly configured traction/stability control system. Below in the manual it states that if you hold the 'off' button for 3 seconds it disables traction and stability control AND in a manual car the Brake LSD is also disabled (i.e. no need for pedal dances). https://view.joomag.com/subaru-brz-m...028204?page=11 So... I've heard this noise at a couple of events but this is the best one that got captured on video. I'm running my 2017 Brz with Traction Control 'OFF' which I thought disables the brake lsd thing? So what do you think it is? It can be heard at: ~:35 and ~:45 [ame="https://www.youtube.com/watch?v=Ao3HYMnGQhk"]July 9th Alaska SCCA Autocross C-Street 2017 Subaru BRZ - YouTube[/ame]

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07-10-2017, 02:02 PM	#2
mav1178 Senior Member Join Date: Apr 2013 Drives: 2005 Toyota Camry Location: 91745 Posts: 6,562 Thanks: 493 Thanked 6,097 Times in 3,029 Posts Mentioned: 95 Post(s) Tagged: 3 Thread(s)	your ABS is kicking in. Only way ABS is disabled on this car is if you pull the ABS fuse.

07-10-2017, 02:04 PM	#3
Pho20 Member Join Date: Jun 2017 Drives: 2013 Subaru BRZ Location: Colorado Posts: 80 Thanks: 11 Thanked 16 Times in 10 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Vsc is still enabled you need to do the pedal dance http://thenewswheel.com/how-to-unloc...ur-subaru-brz/

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