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Vibration Like No Other


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Hi people, just finished an engine upgrade and finally got my car on the road. Everything's great until 100km/h. Thought it was wheels so I changed them for new and balanced but it didn't make a difference. I've always had alloy pineapples (solid mounted sub frame) and the 2-way diff didn't have any problems before the engine upgrade, although I had it out and a friend borrowed it. I've got a second hand R33 5-speed box and a new custom one piece tail shaft. The vibration doesn't come through the steering wheel or gear stick but you can feel it in the back of the seat like a monster sub-woofer.

I'm not sure where to or how to start identifying the problem...?

Any suggestions?

Thanks,

Daniel

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Hi people, just finished an engine upgrade and finally got my car on the road. Everything's great until 100km/h. Thought it was wheels so I changed them for new and balanced but it didn't make a difference. I've always had alloy pineapples (solid mounted sub frame) and the 2-way diff didn't have any problems before the engine upgrade, although I had it out and a friend borrowed it. I've got a second hand R33 5-speed box and a new custom one piece tail shaft. The vibration doesn't come through the steering wheel or gear stick but you can feel it in the back of the seat like a monster sub-woofer.

I'm not sure where to or how to start identifying the problem...?

Any suggestions?

Thanks,

Daniel

new custom one piece tail shaft is where to start looking.

Edited by djr81
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I'd start tracing it back through the drivetrain. At 100km/h (or over), does it still make the same noise if you engage the clutch / put the gearbox in neutral? If yes, then you can basically rule out gearbox and start looking at the tailshaft/diff. Try putting the thing up on a hoist and drive the thing past 100km/h. If the sound is gone it's in the wheels / bearings, if it's still there then it's no doubt diff or tailshaft related. Your friend might have lunched your diff for you...

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The tail shaft has been balanced but its always possible someone made a mistake while doing it. Wish I had a hoist haha. Will check neutral but clutch depressed doesn't make a difference. Will try to take a look at it next weekend if I get a chance.

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Had a look at everything today, there was no excessive play anywhere and no abnormal noise. From tail shaft there is only 1mm of twist movement before the wheels move, so I took the tail shaft in for a balance and they found one of the uni joints isn't snug in its housing so its being replaced, will find out tomorrow if it was unbalanced.

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