I've been battling a lazy turbo switchover as well as a 9-5-9 pattern in a high gear (or a 5-5-5 in first). I checked around and under the UIM and really found nothing. Upon driving it again I noticed a sound that I don't think I've heard before:

The boost seems to be more violent sounding. It sounds much like a TV on white noise static mimiced by a person trying to make the noise with their mouth. It also could be described as turbulent wind through a plastic pipe. Is this normal sound or could this be related to my problems?

 

boost leak my friend.
check the couplers on your ic. piping.
specially the one coming directly off the y-pipe.

 

I've looked for the obvious so far. I suppose i must look further.

 

when you took the uim off, how did the gasket look, was it in 1 piece? and i'd check the hoses below the intake box. there usually the ones that go first(excessive heat from turbos)

 

I had the problem with the 1st FD. I looked, and tested valves, etc, before finally finding it was the plastic hose that connected to the stock IC. It was a very small crack, but enough to leak tons of air.

 

Boost leaks are almost never obvious. Take the intake couplers out of the car to inspect them.

 

^^sorry i should have stated earlier that u must remove the y-pipe/ic coupler completely to find the split.

 

^ dito

Take the couplers off and look at it in the light especially the turbo/y pipe coupler. I had boost problems for almost a year and that was the culprit.

 

I have the same problem with the same weird sound... car is away for the winter now..
let me knwo what you did to resolve this problem2@!@!@

 

Hey interesting find there
what "hose" exactly ? is it the one that routes down to the Y pipe /turbos or the one that goes into the actual engine ? that had a small crack