High pitch whine under boost
I was luckily enough to have the turbo bolts come loose, over the weekend and the gasket got blown in half. I have fitted a new gasket and tightened the bolts, I used cap bolts and drilled a hole in the heads to I could pass a piece of stainless wire thought the heads and tie them all together. Hope this stops them from coming out.
Now when I get for a drive, there is a very high pitched whine coming from the engine bay, it only happens when the boost gets above 11psi. Its almost like a big ass supercharger noise but louder.
At idle the engine sounds normal, even while driving at speed with low or no boost it sounds normal.
I have checked for boost leaks by using the compressed air method, went up to 20psi and didn't find any leaks. I even checked the DV in case it wasn't closing properly and boost was creeping past and making the noise.
could I have a cracked turbo housing or damaged bearings in the turbo.
whats left to inspect.
the bolt design