Rb25Det Turbo Or Something Else

[jSbr0]

Hey guys Basically i was driving along going from 4th to 5th and a puff of blue smoke came out the back between the gear change I have done a bit of searching and there is talk of valve stem seals But only just over the last week my turbo has been making a whining noise as it starts to boost and hesitates when i first take off after starting the car (not thrashing) Now ive taken the piping off and there is a bit of blow by in the pipe before the turbo The turbo is clean but does have shaft play 1 second in out not sure if this is normal How else can i check to make the turbo hasn't gone bad Do i need to drop the exhasut side off

[75coupe]

Is there any evidence of the compressor fins hitting the sides?

What boost are you running?

[jSbr0]

Not that i can see but there is something on the fin top left http://imageshack.com/a/img842/5954/urmbi.jpg

I run 10 but does spike to 12 at times