I seems to me that my car doesn't like me...i was runnin this afternoon and while testin i heard this knockin sound in the engine...and the car started losing boosts...and pushed out a lot of black smoke through the exhaust i had to cancel the run....now i am wondering if a piston is broken or a valve or somethin....what do u guys think ?

i was runnin about 1.1 bar boost thats like 14 psi

 

I believe 1.1 bar is more like 16psi as for your motor, sorry i cnt help you

 

What sort of engine management are you using? How are you adjusting the boost (you've gone from 20 psi to 13, and now back up to 14 psi).

Take it to any competent garage for a compression check. Better yet, a race-type shop that has and knows how to use a leakdown tester. It's hard to guess based on what you've posted because black smoke usually indicates an overly rich condition. When something breaks, it's more often accompanied by bluish oil smoke, not black like raw unburnt fuel.

Take it to a shop.

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