What have you guys done to relieve any vibrations inside your 86?
 

I'm researching all the potential vibration spots on the inside of my BRZ, it takes a beating on these terrible roads in Ottawa, Ontario (Yes, nation's capital can't afford to fix pot holes every 10m). What are some of the things you guys have done to eliminate any vibrations inside the car? Thank you in advance!

Well almost anything you do involves some sort of trade off but there are options.


The big three:


Sound and vibration Matting - Will reduce noise but to do right is a pile of work and adds weight.


16" Wheels - Have a deeper sidewall to absorb bumps better but will reduce handling in the corners.


Softer struts or coilovers - Same effects both good and bad as 16" wheels.

I realized most of the vibrations I was hearing were in the plastic interior panels... so I just removed them. Free weight savings. Increased road noise from my tires coming through from underneath though, but eh, now I don't hear any vibrations.

You might consider different tires.

Reducing the tire pressure a few pounds usually helps.


humfrz

Should mention my car isn't running completely stock, I've got 18" rims with 255/35 tires, barely lowered. My coilovers are a bit stiff though so I'll look into fixing that

https://www.parts-express.com/sonic-...12-4---268-046

add a layer directly on top of the metal in the inside of your car, then put everything back on top of it

1. Reducing tire pressure - sometimes even 1 psi will make an appreciable difference in noise and comfort

2. Bushings - surprisingly fitting rear subframe bushings from Whiteline made the ride more pliant and less crashy. The clunks went away as well. I gained a bit of noise but the good kind. In fact, after fitting all the trans/diff/subframe bushings and inserts, friends say the car sounds like it was tuned. But it's less clunky.

3. Knowing what causes them - sometimes it's your work ID badge in the door pocket that keeps rattling. Sometimes the passenger seat isn't fully clicked into position. Sometimes it's the seat belt buckle against the door. The rear seat back being clicked into position on only one side drove me crazy for months til I figured out that's what it was.

Other than that, no rattles really.

and you're blaming the ROADS - ;)

humfrz

If it's the vibration from the road, the only thing you can really do to affect that is the damping of the suspension, stiffness of the shock, and the tire that you're running on.

For me, I am running Tein Flex A (the one with hydraulic bump stop) at 15 clicks so it's super soft. The springs I believe are 6k, but anything about 6k is pretty stiff. Tune your suspension for max softness. For the tires, what is going to matter is the sidewall stiffness and tire pressure. You want a more passenger-like tire, I'm running Michelin Pilot Sport 4S @ 35 PSI and it's a little stiffer than I would like, but if I drop it below 35 PSI my MPG takes a 1-2 MPG hit if not more. You may want to try to drop your PSI to 32.

I'm currently trying to find a comfortable and quiet tire in 255/35 R18 However, most tires in that size are performance tires.

install loud ass exhaust so you don't hear vibrations anymore. lol. jk.. idk i kinda just deal with mine and enjoy my BOV noises.

18" rims are like running tires made of rubber bands. Not the best for rough roads.

https://i.imgflip.com/xhss9.jpg

get a louder exhaust, install a sub and empty your care cup

Living on the west side of Vancouver, I have my fair share of potholes around my house. Ironic, how houses in my area are all around $2M-$5M a pop, yet we have such shitty patchy roads. In contrast, east Vancouver has much nicer roads, repaved, but houses are averaging around $1M.

Anyways, I find it's much worse in the winter. I also find that a clean interior helps with NVH especially when you wipe stuff down with 303 aerospace wipes or armorall. the tradeoff is residue.

Oh, turning off the vibrator in the passenger seat also helps.

It's got a catted Magnaflow exhaust, the vibrations are loud from coming from inside the cockpit, probably the 3rd brake light vibrating against the rear window?