Hi all, got a 1998 S40 T4, been running fine for months, bought it in october and she was running sweet. First thing i did was strip out the airbox soundproofing and reinsert the stock panel filter. Recently installed a new pipercross filter which has increased the loudness of the wastegate chatter but this has nothing to do with my problem.
When i spool her up now i can hear a massive "whoosing" of air, assuming it's a boost leak but it's my first turbo'd car so don't really know what i'm looking for but i have checked the red / yellow / blue BCV hoses, upper lower charge pipes from intercooler and hoses from throttle body to turbo. Actuator arm is moving freely, but not excessive play, exhaust elbow to turbo nuts/studs are tight, can't find nothing, no splits or apparent holes that are visable to the eye. All jubilee clips are tight.
What i cannot work out is that i don't lose any boost at all, still as quick as ever.
All i can see is that the intercooler cooling fins, as in the vertical zig-zag fins that run between the horizontal fins that cool the air are damaged and slightly dislodged from the intercooler.
I have also noticed that the car / boost runs perfect when she reads "cold" on the info centre, only when she gets to about 50oC, the whooshing when under load / boosting starts is apparent.
As i don't know nothing about turbo's, any ideas as i can afford a rolling road the now [just taxed her & she's in for m.o.t the now]
Any help, suggestions would be appreciated
Barry
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