need a little help

[urquattro-island]

have read about boost loss and so on, but can not find what i am looking for.
My old car s4 aan, is loosing pressure when shifting from 1st to 2nd gear, full throttle on first and it goes like a rocket, then shift to 2nd and it falls down 1,4on the nr in the dashpanel insert, and takes looong to come back up?? Any ideas?? its like the turbo is taking a long time to build back pressure.

1st gear shows 2,4. Then shift 2nd then falls all the way down to 1,4-1,5 and just uses forever to get back up to speed.

thanks for replies

john

[porkkis]

Read the fault codes. Something keeps ECU dropping boost control off.
Might also be faulty N75.

Btw you could improve writing subjects.