2015 BRZ Shakes during burnouts??
 

https://lh3.googleusercontent.com/kR...o=w783-h746-noHey guys, I find this forum very helpful with car maintenances, interior, and etc and rn im having some issues with my right rear suspension/ differential?
I own 2015 brz with rays gramlights, lowered spring with hankook ventus v12 evo 2 (265) and during trial of burnout wet/dry surface as soon as wheels start to turn, right rear wheel starts to skip/ vibrate up and down. does anyone know solutions to this problems? im hoping to get new coilovers so i dont have to rely on lowered springs. Also if you have any recommendations for good coilovers and suspension mods help yo brother out with good infos

Read this thread and come back to us with questions:

https://www.ft86club.com/forums/showthread.php?t=29020

Why do you want to do burnouts in your car in the first place?

My 2015 does it too, with factory suspension etc. In the old days we used to refer to it as axle tramp and it only happens at low road speeds when spinning the rear tyres. I get no such effect if drifting, ie. there is a sideways component to the slide, it just spins and slides. If I'm going fast enough, and can spin the tyres on say a wet greasy road in third there is no shake either.

Because it's fun.

There are lot of compliant bushings for these cars in transmission & suspension for comfort and to reduce NVH. Some of technical design decisions are for safety. They all add up that when your wheels are spinning in burnouts, that several components rattle/shake up a lot.
You can change that, eg. install less compliant aftermarket mounts/bushings, eg. rear subframe, diff, gearbox bushing & mount, engine mounts, but not without increased NVH during DD. Some shaking may be attributed also to two piece drive shaft, which is designed this way to fold in case of frontal accidents, to allow engine move down instead up straight, possibly injuring legs and shaft breaking off and piercing cabin or digging into ground and breaking something else in unexpected fashion. Everything is compromise, so not sure if not that frequent use type warrants compromising other areas.

:slap: you're advocating bad habits to the young-ens, old man.


humfrz

Hi ya, SamtheKorean, welcome to our gang - :clap:

First off, doing "burnouts" in this car isn't doing it any favors, it's hard on the whole driveline and suspension.

Second off, it doesn't have enough power to impress anyone with a chirp and a puff of smoke.

Third off, you bought the wrong car to do burnouts.


OK, it's old grandpa's med time - :D

Get poly or solid bushings for rear subframe and diff mounts. This helped a lot for me. Now only the transmission is shaking like mad instead of the entire car.

Sent from my Pixel 2 XL using Tapatalk

All the people saying not to do burnouts, or you bought the wrong car.... stfu. It's a rwd sports car.

My guess is you're not using enough initial rpm to get it going or your tires are too sticky without enough power. A 265 is a decent sized tire for sure. You're getting what's commonly known as "wheel hop."

Obviously changing bushings will help driveline vibrations, but my guess is not enough power for the tires / road surface.

If you continue to have issues only on one side you can try a different half shaft (available in the aftermarket) on that side.

Although that is a last ditch effort imo several manufacturers actually build different weights / diameters into their axle shafts to combat this very thing.

[ame]https://www.youtube.com/watch?v=7f526kO7IMw[/ame]

Yes stop doing burnouts. I pity the person that buys cars from these guys. The abuse I read about on this forum is frightening.

Isn't your avatar a picture of your car at a track????:cheers:


These things are toys. Enthusiasts will use them enthusiastically.

Burnouts and drifting are significantly harder on a car than a track day...

I feel like they're all using the car in a way that it was intended...... track days can be considered abuse by many anyways.

What's worse? A 30 second burnout or multiple track laps at 8/10's? Lots of factors at play.... everyone is going to enjoy the car how they want to.:iono:

Wheel hop is evil. Stock transmission does not hold up to being bitch slapped.

:slap: that's true for any vehicle.

While this is true there is a difference in running laps properly and doing things to a car that do nothing but put undue stress on the drivetrain. Burnouts in a low power car with sticky tires that are way too big is just asking for things to break

I alluded to the sticky tire / low power thing in my first post.

They do more than just stress the drivetrain. Jfc enjoy your cars. You dont do a quick scuff off before an auto x run or anything?

No. You need to respect your equipment. I come from a place of respect for my cars. Beating the shit out of them is not in my program

:lol: I dont think anyone here is entering burnout competitions. Although a lot of people who aren't enthusiasts would think an HPDE or autox event is beating the shit out of a car.

I do agree about respect for your equipment, especially when there are potential mechanical risks involved. Like a track day, or autocross, drifting, or even daily driving.

For well-understood, controllable reasons, some hold up much better than others.






....ok, yeah.

Burnouts (and drifting) are extremely hard on cars, significantly worse than a track day. Way harder on brakes, bearings, etc.

Lots of variables in that one statement. I would venture a guess that a standing reasonable burnout would be less damaging than multiple track laps.


Obviously you're only using one set of brakes and one set of tires. Bearings, driveline components etc will obviously heat up since there is no air moving plus the initial driveline shock, but if you're smart about easing in to brakes and not being a complete and total idiot and burning your tires to the rim.... lets be honest. Sustained track usage would be more damaging.


Not quite sure where drifting came in to play, as that's a different ball of wax.


At the end of the day this all comes down to a simple mindset. "Use it, break it, fix it, repeat." If you don't want to do that.... don't do anything but drive your car A to B in a sensible manner.

Sorry, but I disagree heartily with some of the opinions expressed here. A burnout isn't anywhere near as hard on a vehicle as a track day. Not even close. I don't know how you even come to that conclusion.

30 seconds of wheel hop would be FAR more destructive than an entire day of 8/10th track time. Track time emphasizes smoothness. Smoothness makes things last. Wheel hop is your driveline acting like a gigantic metal whip, with all that peak shock transmitted back through the suspension, rear diff and transmission to every bearing and bushing in there.

If all that lash and rubber banding were taken out of the system with urethane or delrin everywhere, then the burnout wouldn't be as harsh/less likely to break things. But then you're making the car less pleasant to street.

WHO IN THEIR RIGHT MIND IS WHEEL HOPPING FOR 30 SECONDS STRAIGHT!?!?!? Gtfoh. A burnout is not the same as straight wheel hopping... you notice wheel hop you get out of it. Ffs....

Also, thanks for emphasizing smoothness, something I have alluded to previously in this thread. :slap:

Thanks for the clarification. If you read the thread again, OP is complaining about wheelhop. If you have a time machine and have jumped into the future when he's replaced all his bushings and suspension pickup points, and is now doing nice smooth burnouts, then you are correct that we don't need to worry about 30 seconds of wheelhop any more. Until then, a 30 second burnout can very likely mean 30 seconds of wheel hop and breakage.

Suggesting that a burnout is more destructive than a track day because of wheel hop is stupid. If you're getting crazy wheel hop during a burnout, you're doing it wrong. By that logic, I could say that street parking your car is more destructive than a track day, if I assume that you suck at street parking and are parking it in a lake...

If you're getting wheel hop during a burnout, you aren't using enough throttle. Wheel hop occurs when you're right on the edge of grip/no grip, and the tire alternates between sticking, and not sticking. If you COMMIT to a burnout, you won't have that issue.

If OP is having issues with wheel hop, people need to tell him what to do to keep that from happening... not tell him that burnouts are worse than track days, lmao.

OP: USE MORE THROTTLE.

LMAO. Go nuts guys. Make sure you keep the motor bouncing off the rev limiter too.

I doubt bushing replacement is even the answer here..... seriously. I doubt he is "sending it" full on when he notices the issue. Enough to notice it is on one side only (apparently) but what are the other details? Is this guy even doing this more than once or twice?!?! What is going on in this thread?

Where is the OP?!?!?! :popcorn:

....wtf?