Ford Fiesta III 1600 Turbo Sticks Fuertes Tirones

Hello friends, my problem is that after a while of melting the car on circuit 2 or 3 laps begins to paste some beastly pulls at 3500 rpm if we remove the turbo (we mean we release the rod of the discharge valve) Do not paste them.
I do not think it is the problem of the valve since even though it is giving the pulls the noise of the discharge sounds until you release the gas.
They are not thyroces is something to the beast.
Well thank you very much in advance and Aki I leave you a link in case you want to see the car (or videos of the rallies and climbs of Mallorca.) www.youtube.com/user/anemdelallys

If you bring turbo empty and the solenoids sure is that a vacuum or a solenoid

Thank you very much for helping me tomorrow I will buy it and I will tell you things to have seen something. I will investigate that it is the void and how it works since I have no idea thanks for your interest. I do not understand almost anything but if you have a problem with any appliances, do not hesitate to ask me.

Hala Man Mira I think your turbo is getting locked and only works in times, I explain you I think it retains a lot

Hello friends thanks for answering yesterday the solenoid and clean it as I could (not much) and I think the valve was stuck at the moment it seems that it goes from ... mother. The car is finer that ever accelerates before and has can Can the noise of the discharge. By the way I have the pressure of the turbo at 0.9 to 6000 rpm, is it a lot
or is okay? I do not want to load it,
every time I accelerate I will remember the manuals that have helped me so much. Thank you very much.