Removed undertray, now rubbing above 60 mph? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

ZionsWrath · 05-02-2015, 01:05 PM

Was working on my car and removed the front metal undertray and the fabric one below the transmission.

I am planning some more work on the car soon so I left them off for now.

Thing is when I go above 60mph I get this awful sound of flapping/rubbing. The faster I go the worse it gets, I didn't even go over 65 because it sounds so bad.

It sounds like a fender liner or some type of plastic is flapping in the wind and rubbing on either the asphalt or some part of the car.

When I stop and look over the car I can't see any evidence of anything rubbing or dragging on the ground.

Anyone know what I should be looking for?

R3NIK · 05-02-2015, 01:58 PM

Not sure either, but I experienced the same thing when I drove two weeks without that undertray. Anything under heavy acceleration caused a massive flapping sound.

ryoma · 05-02-2015, 02:00 PM

Are you sure its not the air getting trapped under there making the flapping sound?

Sent from my VS980 4G using Tapatalk

cjd · 05-02-2015, 02:05 PM

There is one piece that shares two bolts with the fiber piece. If you didn't reinstall those and didn't take a piece off that went to the year wheels, I'd guess this is what you hear flapping.

At least, it's there on my BRZ, suppose it may not always be there on all models.

DJCarbine · 05-02-2015, 02:10 PM

I drove without my undertray when I installed my header so I could tighten the bolts after a heat cycle easier.

One of the plastic bits folded on itself after I hit 70 and started dragging on the ground.

There are a few things you want to ziptie or otherwise secure if you plan on running without the undertray. This was 2 years ago so I couldn't tell you exactly, but it should be easy to spot what needs to be checked

jvincent · 05-02-2015, 06:19 PM

IIRC, there is a wheel well liner that is secured with the bolts for the metal under tray. That was probably what was flapping.

FirestormFRS · 05-02-2015, 06:55 PM

It's the drivers side tray behind the fiber cover. It makes a helluva racket and the longer you drive it the lower the speed you'll need to make it flap. Stick a bolt in the single hole until you get the bottom put back on

DJCarbine · 05-02-2015, 07:30 PM

Quote:

Originally Posted by jvincent

IIRC, there is a wheel well liner that is secured with the bolts for the metal under tray. That was probably what was flapping.

Yup, thats what it was

05-02-2015, 01:05 PM	#1
ZionsWrath Thanks Join Date: Apr 2013 Drives: BRZ Location: NY Posts: 4,163 Thanks: 5,989 Thanked 3,100 Times in 1,498 Posts Mentioned: 38 Post(s) Tagged: 3 Thread(s)	Removed undertray, now rubbing above 60 mph? Was working on my car and removed the front metal undertray and the fabric one below the transmission. I am planning some more work on the car soon so I left them off for now. Thing is when I go above 60mph I get this awful sound of flapping/rubbing. The faster I go the worse it gets, I didn't even go over 65 because it sounds so bad. It sounds like a fender liner or some type of plastic is flapping in the wind and rubbing on either the asphalt or some part of the car. When I stop and look over the car I can't see any evidence of anything rubbing or dragging on the ground. Anyone know what I should be looking for? __________________

05-02-2015, 02:00 PM	#3
ryoma Senior Member Join Date: Mar 2015 Drives: 2015 Subaru BRZ Limited CWP Location: SoCal Posts: 1,561 Thanks: 34 Thanked 669 Times in 469 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Are you sure its not the air getting trapped under there making the flapping sound? Sent from my VS980 4G using Tapatalk __________________ My 2015 CWP BRZ Build

05-02-2015, 02:10 PM	#5
DJCarbine Thupercharged Join Date: Mar 2013 Drives: 2013 FR-S Location: La Grange Park, IL. Posts: 1,501 Thanks: 116 Thanked 751 Times in 439 Posts Mentioned: 23 Post(s) Tagged: 0 Thread(s)	I drove without my undertray when I installed my header so I could tighten the bolts after a heat cycle easier. One of the plastic bits folded on itself after I hit 70 and started dragging on the ground. There are a few things you want to ziptie or otherwise secure if you plan on running without the undertray. This was 2 years ago so I couldn't tell you exactly, but it should be easy to spot what needs to be checked __________________ 2013 FRS Vortech V3 11psi Revworks UEL - PLM Overpipe - MOTIV catted frontpipe - Invidia Q300 2019 Series.Grey STI - Stage1+ SF

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05-02-2015, 06:19 PM	#6
jvincent Senior Member Join Date: Sep 2013 Drives: 2022 WRB BRZ Sport-Tech Location: Ottawa, Canada Posts: 1,746 Thanks: 131 Thanked 1,411 Times in 715 Posts Mentioned: 25 Post(s) Tagged: 2 Thread(s)	IIRC, there is a wheel well liner that is secured with the bolts for the metal under tray. That was probably what was flapping.

05-02-2015, 06:55 PM	#7
FirestormFRS Senior Member Join Date: Jul 2012 Drives: 2013 FR-S Location: Anytown Posts: 920 Thanks: 73 Thanked 643 Times in 302 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	It's the drivers side tray behind the fiber cover. It makes a helluva racket and the longer you drive it the lower the speed you'll need to make it flap. Stick a bolt in the single hole until you get the bottom put back on

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