Hard acceleration/revving noise - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

oppiee · 10-23-2014, 06:26 PM

Hey guys,

I noticed that if my car is in neutral and stopped if I hit the accelerator hard say from 0% to 60%, I hear the scratchy sandy noise just before the rev.

I hear it at times to when I do somethign similar while on the road. not sure if you guys have similar experience or that I should get it looked at.

Thanks

Thorpedo · 10-23-2014, 07:08 PM

Search "tip-in knock". Post if that sounds like it.

wparsons · 10-23-2014, 10:12 PM

I doubt it's tip in knock, it's probably the suction noise from the intake side of the engine. It's more pronounced with an aftermarket intake, but 100% stock it's definitely more noticeable on these cars than most other cars I've driven.

Ultramaroon · 10-23-2014, 10:27 PM

It's a cool sound, like when you pull out that wad of paper clogging the shop vac.

Big fucking throttle body and a fast servo.

oppiee · 10-24-2014, 01:46 AM

It kind of sounds like tip-in knock, but only happens on the initial acceleration. It doesnt always happen. It happens when I blip the throttle for a rev match too. funny thing is it doesnt always happen.

Its not the intake noise for sure.

nocwage · 10-24-2014, 06:25 PM

Could be the stepper motor moving the throttle plate?

PMPB · 10-26-2014, 12:58 PM

I'm with wparsons on this one...

Under the right conditions this car sometimes creates weird intake noises. I have a plug in my 'sound tube', but occasionally, under the right conditions, I can the pressure waves pushing past the plug.

OP, do you have a plug in your sound tube? Try either putting one in, or removing it, to eliminate that as source of bizarre intake sounds.

oppiee · 10-26-2014, 01:02 PM

I did have a plug in before. I took it out.

With the plug in for some reason at high revs i kept hearing this rattle, but its gone with the plug out. So i left it out.

So this sound is with the plug out. Not sure if that helps.

Ultramaroon · 10-26-2014, 02:59 PM

Here's a crazy thought. What would a failed/failing kazoo thingy sound like? It could happen, right?

But I'm gonna stick with my original because I hear it all the time. At least it still sounds like a car with a real throttle cable.

10-23-2014, 06:26 PM	#1
oppiee Senior Member Join Date: Feb 2014 Drives: 2014 Scion FRS (Red) Location: Toronto Posts: 149 Thanks: 15 Thanked 15 Times in 14 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Hard acceleration/revving noise Hey guys, I noticed that if my car is in neutral and stopped if I hit the accelerator hard say from 0% to 60%, I hear the scratchy sandy noise just before the rev. I hear it at times to when I do somethign similar while on the road. not sure if you guys have similar experience or that I should get it looked at. Thanks

10-23-2014, 07:08 PM	#2
Thorpedo The SquadWhisperer Join Date: Mar 2013 Drives: '13 Ultramarine FR-S (STX) Location: Nova Scotia, Canada Posts: 681 Thanks: 383 Thanked 477 Times in 207 Posts Mentioned: 16 Post(s) Tagged: 0 Thread(s)	Search "tip-in knock". Post if that sounds like it. __________________ 2013+14+15 Atlantic Region Motor Sports Autocross STX Champion 2013+14+15 Atlantic Region Motor Sports Overall Autocross Champion 2017 Bluenose Autosport Club Overall Rallycross Champion Powered by Great North Performance, Jani-King Canada, and OK Tire.

10-23-2014, 10:27 PM	#4
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: 1117 Post(s) Tagged: 9 Thread(s)	It's a cool sound, like when you pull out that wad of paper clogging the shop vac. Big fucking throttle body and a fast servo. __________________ service manuals

10-26-2014, 02:59 PM	#9
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: 1117 Post(s) Tagged: 9 Thread(s)	Here's a crazy thought. What would a failed/failing kazoo thingy sound like? It could happen, right? But I'm gonna stick with my original because I hear it all the time. At least it still sounds like a car with a real throttle cable. __________________ service manuals

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10-24-2014, 01:46 AM	#5
oppiee Senior Member Join Date: Feb 2014 Drives: 2014 Scion FRS (Red) Location: Toronto Posts: 149 Thanks: 15 Thanked 15 Times in 14 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	It kind of sounds like tip-in knock, but only happens on the initial acceleration. It doesnt always happen. It happens when I blip the throttle for a rev match too. funny thing is it doesnt always happen. Its not the intake noise for sure.

10-24-2014, 06:25 PM	#6
nocwage MMTT Join Date: Aug 2013 Drives: 2019 Subaru BRZ Location: Ontario Posts: 130 Thanks: 7 Thanked 44 Times in 30 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Could be the stepper motor moving the throttle plate?

10-26-2014, 12:58 PM	#7
PMPB Senior Member Join Date: May 2013 Drives: BRZ Sport-tech Location: Canada Posts: 347 Thanks: 77 Thanked 182 Times in 111 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I'm with wparsons on this one... Under the right conditions this car sometimes creates weird intake noises. I have a plug in my 'sound tube', but occasionally, under the right conditions, I can the pressure waves pushing past the plug. OP, do you have a plug in your sound tube? Try either putting one in, or removing it, to eliminate that as source of bizarre intake sounds.

10-26-2014, 01:02 PM	#8
oppiee Senior Member Join Date: Feb 2014 Drives: 2014 Scion FRS (Red) Location: Toronto Posts: 149 Thanks: 15 Thanked 15 Times in 14 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I did have a plug in before. I took it out. With the plug in for some reason at high revs i kept hearing this rattle, but its gone with the plug out. So i left it out. So this sound is with the plug out. Not sure if that helps.

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