Hej everyone,

Having a problem again with my rst.

iIve changed my Turbo back to a standard one ( had a stage 3 t3 ) because my boost was coming in verry late and wasn't really driveable.
All worked fine so it seemed but had it on the rollers today for a good setup and there was a problem.
My boost isn't stable, it judders up to like 1 bar and a few seconds later its @ 0.9, then a few seconds later its @ 1 bar again.
The operator said he can't set it opproperly like this.
He set the roller @ a fixed speed and the bph went up and down like 10-15 bhp.
He said the problem could be in the wastegate sticking but i put the turbo on and the wastegate lever was running freely.

Anyone got a suggestion what could be wrong??

thanx