weird sound when accelerating in low RPMs - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Jasonb · 03-03-2018, 12:39 PM

It’s not exactly a quiet car

MyGT86Yas · 03-03-2018, 02:01 PM

People here say it’s the throttle body and it’s normal.

Sent from my iPhone using Tapatalk

nico_rsx · 03-03-2018, 03:35 PM

Quote:

Originally Posted by evoto86

metalic noise when say you're cruising in 3rd or 4ths below 3krpm you let off the gas for a second, give it a tap to pick up speed but as soon as you do you hear a noise which sounds like two metal rods making contact.

I've notice the exact same thing (2017 BRZ). But it doesn't make it all the time. I thing it's pretty rare actually.
It seems to come from the back of the car. I tought maybe it's a thing call differential backlash, where you have a little "play" in the differential gears (something normal), and that going from compression to acceleration the gear make that noise. But it could also be from the muffler. Even tough it's a mettalic sound, I feel like it could be some kind of rapid pressure change in the muffler.

number_Un0 · 03-04-2018, 04:22 AM

OP, I'm pretty sure my car makes the same sound your talking about. Mine's been doing it for 20K+ miles and no issues so far.

Don't let noises and rattles scare you. I'd be more worried if my car didn't make any weird noises.

evoto86 · 03-10-2018, 04:22 AM

from reading the comments i feel better about it, its probably nothing. If something breaks in the next 3 years i got warranty so will see.

Ultramaroon · 03-10-2018, 03:20 PM

next time it's doing it, try rolling on the throttle slowly. Does that help?

tip-in knock.

Pretty hot these days?

Tek · 08-09-2019, 01:45 PM

Sorry to revive an old thread but I’m having a similar issue. I also hear a squeaking sound as I’m applying throttle after shifting but it sounds more of a rubbery squeak. Here is my video of a metallic scratching sound as I jab the accelerator.

Ultramaroon · 08-09-2019, 03:36 PM

Quote:

Originally Posted by Tek

Sorry to revive an old thread but I’m having a similar issue. I also hear a squeaking sound as I’m applying throttle after shifting but it sounds more of a rubbery squeak. Here is my video of a metallic scratching sound as I jab the accelerator.

That sounds like tip-in knock. Bad mojo. What kind of engine mods do you have?

Decep · 08-09-2019, 04:13 PM

Guess my hearing sucks, cant hear anything in that video.

OwlDance · 08-09-2019, 05:14 PM

Quote:

Originally Posted by Tek

Sorry to revive an old thread but I’m having a similar issue. I also hear a squeaking sound as I’m applying throttle after shifting but it sounds more of a rubbery squeak. Here is my video of a metallic scratching sound as I jab the accelerator.

What RPM are you cruising at when you're jabbing the throttle and giving it the beans? I notice it pretty much doesn't happen above 3k at least on my car. Sub 2.5K I can cause the tachometer to waver on demand if I jab the throttle and you can feel the car slightly buck; not good. Engine hates getting anything more than light throttle under 2.5k. Pretty sure it's tip in knock.

Tek · 08-09-2019, 05:42 PM

I think I was cruising around 2500+ rpm.

As for engine mods, I have a Perrin inlet hose and a blitz air filter. I’m a also running a cat-less front pipe with GReddy Supreme SP catback. Other than that, it’s stock.

MilkyWitness · 08-09-2019, 07:14 PM

asdf

Ultramaroon · 08-09-2019, 07:50 PM

My stock engine has tip-in knock under certain conditions. I haven't yet caught it on logs but hope to on my next highway trip. It only happens during a long cruise when I apply throttle too quickly after a long period of mode-4 (fuel cut) operation, for instance, like leveling out after a long downhill.

It's really disturbing so I've learned to apply throttle slowly in those cases. Sometimes I forget. The sound is soul-crushing.

Tek · 08-09-2019, 08:17 PM

Quote:

Originally Posted by Ultramaroon

My stock engine has tip-in knock under certain conditions. I haven't yet caught it on logs but hope to on my next highway trip. It only happens during a long cruise when I apply throttle too quickly after a long period of mode-4 (fuel cut) operation, for instance, like leveling out after a long downhill.

It's really disturbing so I've learned to apply throttle slowly in those cases. Sometimes I forget. The sound is soul-crushing.

Soul-crushing sums it up perfectly.

03-10-2018, 03:20 PM	#20
Ultramaroon not playing cards Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 32,395 Thanks: 53,053 Thanked 37,228 Times in 19,308 Posts Mentioned: 1118 Post(s) Tagged: 9 Thread(s)	next time it's doing it, try rolling on the throttle slowly. Does that help? tip-in knock. Pretty hot these days? __________________ service manuals

08-09-2019, 07:14 PM	#26
MilkyWitness Senior Member Join Date: Mar 2019 Drives: fdsgh Location: asdf Posts: 111 Thanks: 1 Thanked 15 Times in 11 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	asdf Last edited by MilkyWitness; 06-18-2024 at 04:20 AM.

08-09-2019, 07:50 PM	#27
Ultramaroon not playing cards Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 32,395 Thanks: 53,053 Thanked 37,228 Times in 19,308 Posts Mentioned: 1118 Post(s) Tagged: 9 Thread(s)	My stock engine has tip-in knock under certain conditions. I haven't yet caught it on logs but hope to on my next highway trip. It only happens during a long cruise when I apply throttle too quickly after a long period of mode-4 (fuel cut) operation, for instance, like leveling out after a long downhill. It's really disturbing so I've learned to apply throttle slowly in those cases. Sometimes I forget. The sound is soul-crushing. __________________ service manuals

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03-03-2018, 12:39 PM	#15
Jasonb Senior Member Join Date: Jul 2017 Drives: 17 Series Yellow BRZ Location: Wilmington, NC Posts: 190 Thanks: 20 Thanked 47 Times in 40 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	It’s not exactly a quiet car

03-03-2018, 02:01 PM	#16
MyGT86Yas Senior Member Join Date: Nov 2016 Drives: 2017 WRB BRZ Location: OC CA Posts: 152 Thanks: 13 Thanked 14 Times in 13 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	People here say it’s the throttle body and it’s normal. Sent from my iPhone using Tapatalk

03-04-2018, 04:22 AM	#18
number_Un0 Senior Member Join Date: Feb 2016 Drives: 2013 FRS 10 series #0001 Location: los angeles, CA Posts: 139 Thanks: 19 Thanked 29 Times in 18 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	OP, I'm pretty sure my car makes the same sound your talking about. Mine's been doing it for 20K+ miles and no issues so far. Don't let noises and rattles scare you. I'd be more worried if my car didn't make any weird noises.

03-10-2018, 04:22 AM	#19
evoto86 Senior Member Join Date: May 2017 Drives: manual Toyota 86 Location: NSW Posts: 117 Thanks: 23 Thanked 60 Times in 32 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	from reading the comments i feel better about it, its probably nothing. If something breaks in the next 3 years i got warranty so will see.

08-09-2019, 01:45 PM	#21
Tek Junior Member Join Date: Jul 2019 Drives: 2017 BRZ with Performance Package Location: Atlanta Posts: 6 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Sorry to revive an old thread but I’m having a similar issue. I also hear a squeaking sound as I’m applying throttle after shifting but it sounds more of a rubbery squeak. Here is my video of a metallic scratching sound as I jab the accelerator.

08-09-2019, 04:13 PM	#23
Decep Senior Member Join Date: May 2017 Drives: 2013 FR-S Series 10 Location: CA Posts: 1,073 Thanks: 172 Thanked 497 Times in 326 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Guess my hearing sucks, cant hear anything in that video.

08-09-2019, 05:42 PM	#25
Tek Junior Member Join Date: Jul 2019 Drives: 2017 BRZ with Performance Package Location: Atlanta Posts: 6 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I think I was cruising around 2500+ rpm. As for engine mods, I have a Perrin inlet hose and a blitz air filter. I’m a also running a cat-less front pipe with GReddy Supreme SP catback. Other than that, it’s stock.

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