Right guys trying to get to the bottom of this new problem, am leaning towards turbo oil seals. What you need to know
recent engine build, i did the bottom, but bought a cylinder head off a member on here, i checked the valves where sealed before fitting it by havinghead uoside down on a bench and using petrol to see if any passed the valves. All new gaskets, 12.9 headbolts. Done 500 miles on it no problems at all. Took carb off last week and did some mods, 1.2mm 2nd stage, 1mm AC jet. Re fitted, had a few problems with it - blocked idle jet, cleaned 3/4 times and all good. But noticed plumes of smoke on idle, afr's where good, no coolant loss so assumed maybe just as id had the carb off. Was fine running so put boost upto 20psi and afr's are all good. 13.5 idle and driving, rich wot at 10.9
After having some fun in it, 20 miles, no problems when running, no smoke when driving or on cold start up, or on boost. But when i go for a drive, stop at traffic lights, or pull up at home, leave it idling and its fine for 20seconds, then 25/30 seconds and it just goes, loads of smoke! Then if you rev it, it clears, leave it idling and sure thing 25 seconds later, boom smoke!
Turbo i bought new from cr turbo's about 3 years ago, allthough its done under 2k - as 5 is a weekend/nice weather car, and its allways been ran at 12/13psi up until the last 20 miles its been running 20psi (they told me its good enough max at 25psi so i thought 20 would be good)
So no coolant loss, no oil loss as of yet as only done 20miles with the problem. Iv had it on the mot testing machine and no serious amount of hydrocarbons, like 250 which is nothing. Heres a video that shows the exact problem!
http://www.youtube.com/watch?v=GrThE0jZHrg