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Noisy gearbox/clutch bearing on idle


RB335
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Hi Guys

I've got an R33 GTR.  It has a brand new gearbox with only about 2000km on it and it appears to have what is a noisy input shaft bearing, I don't know if it's that or
if something on the clutch could be causing this noise such as the throwout bearing or pilot bush.

The tuner said its the input shaft bearing and that they all become noisy as soon as you put some decent single turbo power through them.
Is this true or not?

A gearbox shop said it could have ran out of oil from high speed driving since that bearing is at the front of the box.

Here is the video of the noise, any help appreciated. I'm unsure if this is common or could just be a bad bearing from new inside the box

It's pull type, has an Exedy Carbon sprung clutch

When you press the clutch in, it goes away.

The thing is... it goes away also when you begin driving, doesn't get loud on load or acceleration, which I'd imagine a noisy input shaft bearing would.

https://www.youtube.com/watch?v=LEGlTI7KNDs

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What your mechanic is telling you is the general consensus. My experience was, 1st box started getting noisy, probably similar to yours at 350kw, then I upgraded to single turbo and changed boxes, put in a rebuilt second hand box. Car made 500ish kw, box lasted two weeks before it started making noises. Was perfect to begin with. Ended up whining quite bad

 

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100 percent he's not lying to you. 

Above 350rwkw the input shaft bearing is on borrowed time. Generally once it wears a groove in the outer race it doesn't get much worse you'll just have to put up with the noise. 

Gearset kits such as ppg that are straight cut are so much better on bearings helical cut while quiet load the bearings a ton more. 

 

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