Noise At Top End

[23PSI]

I have r33 Gtst - just had work done including - hi-flow turbo, timing belt, fuel pump, apexi pfc have intercooler, exhaust 3" etc. On cold start up, sounds like top end noise like a woop woop woop woop woop in quick sequence - difficult to explain but i thought maybe it was the new timing belt? It goes away when the engine is warmed up, any ideas?

[Duncan]

It is possible the timing belt is too tight, this will kill the bearings on the idler pretty quickly. If you can reach the belt, the right tension is if you can twist the belt about 90o

[Bl4cK32]

Yer but where exactly do you mean grab it Duncan?

Ive got new tensioner bearings (i run two on the 3Lt) and a new belt (although it is the rb30det belt) and it has a whoop whopp noise as well. Most nticable on cold starts, but there some other times as well.

Ive heard of a few rb25's that have the same thing, but the weird thing is nothing is wrong -they are all tensioned and setup properly, just noisy.

Edited October 15, 2006 by Bl4cK32

[ignuz]

Well.. maybe your car just needs to warm up.. You're bound to hear some weird noises when it's cold. Why you're hitting your top end when it's cold too is a bit silly.

[mad082]

if i understand correctly he isn't reving it to top end, it just sounds like the noise is coming from the top end.

[Bl4cK32]

yes, its just noise when cold. Who said anything about revving the car when its cold??

[23PSI]

Thanks for all the ideas guys, yeh i did mean at top end of the motor not trashing it when cold. It does go away when the enigne is warmed up so, i dare say it is the belt. Will monitor it and see what happens.

Cheers boys.

[23PSI]

Hey,

Got another one for yas! Got a noise in the exhaust. Had the whole exhaust system done about 4 months ago. It was done at formerly Hardcore Racing in moss street. about 2 weeks after the install I noticed this rattling noise. Checked it out and it sounded like it was coming from the mid pipe like some shards of turbo or something were blocked at the hi-flow cat. I disconnected the cat and found their to be no shards or anyhting forward of the cat. I then also noticed that one of the bolts where the turbo joins to the exhaust had been sheared off or was missing. Firstly, is it common for the RB25 to have this happen and second, could this possibly account for this rattling noise which like i said sounds like something like shards of metal flying around in the exhaust?

[Drivebai]

when do you hear this noise?

On idle? or only when driving?.. do you hear it when the car goes over a bump?

[23PSI]

It is a constant rattle - from start up till shut down

[Links]

Not the exhasut rattling against any of it's mounts is it??.. against the chassis anywhere?

[23PSI]

Don't Know. Had it on the hoist when i disconnected the cat and checked the mounts and they were all on tight