took the turbo appart the other day to Clean all the rubbish out of it.

Put it all back together but left the actuator pipe off to run big boost

Anyway, When the turbo hits 1.0 Bar pressure it makes a hiss then spools down to 0.6 bar, then if i keep the gas on it flicks between 0.6 and 1.0 bar iratically.

I sat and thought about what it could be causing it to do that.

And i came to the conclusion that the amout of pressure being force out through the Exhaust manifold is opening the wastgate because of the pressure.

If anyone nows differ'nt then please let me know. Thanx