Please help - thumping sounding issue with accelerating with turned wheels - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

ThaDonJsuan · 01-06-2022, 01:21 PM

Hi all,

I am having an issue with my 2020 BRZ that i just started noticing recently now that its cold (not sure if its related to the cold).

When I reverse out of my driveway ill turn the wheel so that my back end rotates. Then ill start to go forward and ill turn the wheel to the other side to start driving in the lane but when i accelerate slowly there is a thumping sound at the front of the car which causes the front to slightly shake. It doesn't matter which way i turn. Once the car is straight or close to straight the thumping stops. The only mods i have are camber bolts up front with -1.7 degrees and stainless steel brake lines. Any ideas? Thanks very much in advance.

soundman98 · 01-06-2022, 01:24 PM

a video would help. also get out and check the clearance around the front tires with them turned slightly-- could be part of the fender liner

on my truck, that's exactly the scenario that my front tire will catch the edge of my mud flaps, and make that noise.

but i suspect you have neither mud tires, or big floppy mud flaps.

ThaDonJsuan · 01-06-2022, 01:33 PM

Quote:

Originally Posted by soundman98

a video would help. also get out and check the clearance around the front tires with them turned slightly-- could be part of the fender liner

on my truck, that's exactly the scenario that my front tire will catch the edge of my mud flaps, and make that noise.

but i suspect you have neither mud tires, or big floppy mud flaps.

Thanks! I will get a video but interestingly, once i drive for a few minutes i cant replicate the issue. It will only happen again once the car sits for a while and 'cools down'. Ill need to wait a bit before going back out and getting a vid.

nripinbabu@gmail.com · 01-06-2022, 02:12 PM

wider tires do that when weather is cold out, its normal , will go away once weather warms up

ThaDonJsuan · 01-07-2022, 11:59 AM

Quote:

Originally Posted by nripinbabu@gmail.com

wider tires do that when weather is cold out, its normal , will go away once weather warms up

Thanks! This actually does make a lot of sense now

Tcoat · 01-11-2022, 05:26 PM

Quote:

Originally Posted by ThaDonJsuan

Thanks! This actually does make a lot of sense now

Do you have wider tires? Do you have snow tires?
Not exactly sure what physics would be involved in larger tires causing this just because they are cold.

Ultramaroon · 01-11-2022, 08:42 PM

Is it icy where you take off from your driveway?

soundman98 · 01-12-2022, 12:01 AM

Quote:

Originally Posted by Tcoat

Do you have wider tires? Do you have snow tires?
Not exactly sure what physics would be involved in larger tires causing this just because they are cold.

well clearly, tires swell when they absorb the water from driving in the winter. which causes them to rub.

physics has no place in reality, apparently.

Carsnguitars · 01-13-2022, 12:05 PM

Maybe low tire pressure and/or flat spotting? Once you get moving they even out...?

daiheadjai · 01-13-2022, 01:36 PM

Another thing I could think of would be potential ice/snow build up in your wheels causing them to be (temporarily) unbalanced?
But then that should give you thumping even while going straight...

01-06-2022, 01:21 PM	#1
ThaDonJsuan Member Join Date: Sep 2020 Drives: 2020 Subaru BRZ Sport-tech Location: Toronto Posts: 44 Thanks: 0 Thanked 3 Times in 3 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Please help - thumping sounding issue with accelerating with turned wheels Hi all, I am having an issue with my 2020 BRZ that i just started noticing recently now that its cold (not sure if its related to the cold). When I reverse out of my driveway ill turn the wheel so that my back end rotates. Then ill start to go forward and ill turn the wheel to the other side to start driving in the lane but when i accelerate slowly there is a thumping sound at the front of the car which causes the front to slightly shake. It doesn't matter which way i turn. Once the car is straight or close to straight the thumping stops. The only mods i have are camber bolts up front with -1.7 degrees and stainless steel brake lines. Any ideas? Thanks very much in advance.

01-06-2022, 01:24 PM	#2
soundman98 ProCrastinationConsultant Join Date: Sep 2013 Drives: '14 Ranger, '18 Tacoma 4Dr LB Location: chicago-ish Posts: 11,330 Thanks: 35,240 Thanked 13,673 Times in 6,781 Posts Mentioned: 98 Post(s) Tagged: 0 Thread(s)	a video would help. also get out and check the clearance around the front tires with them turned slightly-- could be part of the fender liner on my truck, that's exactly the scenario that my front tire will catch the edge of my mud flaps, and make that noise. but i suspect you have neither mud tires, or big floppy mud flaps. __________________ "The time you enjoy wasting is not wasted time"

01-11-2022, 08:42 PM	#7
Ultramaroon chicken tonight Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 31,919 Thanks: 52,245 Thanked 36,576 Times in 18,959 Posts Mentioned: 1108 Post(s) Tagged: 9 Thread(s)	Is it icy where you take off from your driveway? __________________ service manuals

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01-06-2022, 02:12 PM	#4
nripinbabu@gmail.com Member Join Date: Jul 2021 Drives: brz Location: Harrisburg Posts: 17 Thanks: 0 Thanked 2 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	wider tires do that when weather is cold out, its normal , will go away once weather warms up

01-13-2022, 12:05 PM	#9
Carsnguitars Member Join Date: Aug 2016 Drives: 2014 FR-S Location: Sunny BC Posts: 38 Thanks: 50 Thanked 9 Times in 8 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Maybe low tire pressure and/or flat spotting? Once you get moving they even out...?

01-13-2022, 01:36 PM	#10
daiheadjai Senior Member Join Date: Feb 2012 Drives: 2003 S2000, 2008 Fit Location: Toronto, ON, Canada Posts: 1,990 Thanks: 2,584 Thanked 1,154 Times in 688 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Another thing I could think of would be potential ice/snow build up in your wheels causing them to be (temporarily) unbalanced? But then that should give you thumping even while going straight...

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