NEW TURBO?

i statrewd hearing a noise from my turbo today it sounds like a chattering when the boost kicks in it dosnt seem to affect performance iots just really loud is all it dosnt do it when i rev the engine in neutral or when im not using the boost just whne i floor it any ideas, the car is a 88 tc with the orginal ihi 183,000 miles making 15psi

take the hose off the compressor inlet, the inlet off and wiggle the turbind shaft from side to side. See if the blades are hitting the housing.Also see if the shaft moves end to end and if the blades are hitting the back of the housing.

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88 TC X 2, 86 SVO, Main TC with K&N, 3"DP to 2.5"duals through Dynamax, Ric valve at 17+ and disconnected KS.
Elite Bodega 16" chrome wheels. Autometer pod w/ A/F and Vac/boost gauges. New engine shortly, ported head and
manifolds, polished and cc'd chambers, A-230 cam, Race Engineering Adj Cam Sprocket, Crowlers, ARP head studs, Walbro 190 pump and T-3 for starters. KB subs
and jack rails.

I'll bet you dimes to donuts that it's your exhaust manifold gasket getting ready to exit stage right. I've had the same thing happen to me a few times. Take a look and see if you can find any burn marks around the gasket. If you can, thats probably going to be your problem.

Terry

It's probably the compressor blades hitting the housing like Pete says.

With any luck, it could be something more painless, like a loose bolt or two (compressor bolts, exhaust/turbo studs, etc.)