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kurbn
05-04-2011, 05:48 PM
my 33 has a harsh vibration I cant seem to pin point.

its nothing like a steering wobble or wheel ballance issue. The feeling is like someone has attached a vibrator to the chassis and it only does it under load.

Boot it in a low gear and start smashing gears and there is no vibration at all, but if doing 50km/hr, put it in 3rd gear and plant it and you get the vibration. Put it in 5th at 50km/hr and plant it and the parcel shelf starts vibrating.

I have checked the exhaust incase it was resting against something and that failed. Gearbox mount doesnt "appear" to have perished.

It will do it in any gear underload and i know the clutch is rooted, the box is quiet as a mouse spinning in neutral, doesnt have any roll over noise. Not something I have experienced before so im hoping someone has.

im just hoping its not the gearbox, I wouldnt of thought so as like I said, the vibration under enough load can rattle the parcel shelf

im waiting for a video I have uploaded to youtube so once thats uploaded I will post it here

cheers in advance

magic1
05-04-2011, 05:51 PM
diff?

Fukushima
05-04-2011, 06:03 PM
I know it's not an r33 but it sounds a lot like the issues I have with my car in 3rd and 5th with the shitty nissan 6 speed / nismo clutch

I've done 30 000ks with it sounding like that without the box blowing or clutch issues so it may not be too serious but maybe try changing gearbox fluid

here is some crap from nissansilvia.net



The noise you hear through an S15 box is very common and was acknoledged by nissan in the early stages however few were fixed as the noise was at the time demed to be acceptable for a sports car.
The problem has been identified as the front two constant mesh gears. The input shaft and the lay shaft's both have a fixed gear that like to become noisy in the teeth over time. The biggest cause seems to be poor lubrication/oil quality.
I have seen dealers replacing bearings, thrust bearings, spigot bushes etc etc however of all the boxes I have seen pulled down they all display the same or very similar wear markings on the gear faces.
Replacing the gears and using a good quality oil will fix the noisy box issue. Its not nessisary to overhaul the box just to replace the gears. You can get away with just replacing the parts that are worn. Typically syncro's and majority of the bearings are re-usable.

kurbn
05-04-2011, 06:06 PM
<iframe title="YouTube video player" width="480" height="390" src="http://www.youtube.com/embed/QjMWG7bjat8" frameborder="0" allowfullscreen></iframe>

drivnhrd
05-04-2011, 06:34 PM
vibrations through the seat feeling like a 'vibrator' could be a center bearing gone or on the way out....if you dont believe it to be through the steering wheel, then the drive line would be where to start

DISTRBD
05-04-2011, 06:40 PM
Put it in 5th at 50km/hr and plant it and the parcel shelf starts vibrating.

Odd

kurbn
05-04-2011, 07:10 PM
very! tomorrow il get it up in the air, get miss's to drive it in 5th gear and put my my ear to a screwdriver on the box and diff and see if I can get it to vibrate

Milhouse
05-04-2011, 07:19 PM
my 33 makes the exact same noise,

low rpm with heavy load and you get a vibration/noise from the gearbox.

i put it down to the gearbox being tired, havent tried a different fluid as yet.

DISTRBD
05-04-2011, 07:22 PM
maybe do it in 5th gear @ 30ks , may do it then aswell

esky
05-04-2011, 08:01 PM
LOL

mitchy
05-04-2011, 08:05 PM
SSQV has given the car aids, suck shit

kurbn
05-04-2011, 08:17 PM
Need to do something about that, instant yellow. Nothing wrong with the factory bov.

_oz
05-04-2011, 08:33 PM
50km/h in 5th? wow overloading the engine much!

kurbn
05-04-2011, 09:03 PM
was just to prove a point that it does it under load

kurbn
06-04-2011, 06:49 AM
jacked it up, chucked in fifth and let it turn over on its own torque and it just started knocking.

put a screwdriver to my ear on the rear extension housing and it sounds horrid.. box is knocking and rumbling like a slut. Suspect a brg on the main shaft is cactus

awesome.. lucky I didnt pay much for it.

now me and the mad scientist have to strip apart the box

DISTRBD
06-04-2011, 07:06 AM
jacked it up, chucked in fifth and let it turn over on its own torque and it just started knocking.

put a screwdriver to my ear on the rear extension housing and it sounds horrid.. box is knocking and rumbling like a slut. Suspect a brg on the main shaft is cactus


In 5th and letting it idle over ??

kurbn
06-04-2011, 07:12 AM
same shit different bucket

DISTRBD
06-04-2011, 08:15 AM
Yea sounds like box is fucked

kurbn
06-04-2011, 08:46 AM
sounds very healthy
<iframe title="YouTube video player" width="480" height="390" src="http://www.youtube.com/embed/A_qV8fB2zOI" frameborder="0" allowfullscreen></iframe>

_oz
06-04-2011, 12:45 PM
change thread title to wtb r33 gearbox? :D

caibs
06-04-2011, 02:08 PM
before you pull the box make sure the uni joint hasnt flogged out & check the centre bearing like drivinghrd said.