Turbo surge ?
159 1.9jtd mutijet During acceleration in 1st & second as the revs rise to 3000 I get a very distinct increase in acceleration, a bit like an old twin choke carb ! At the same time the turbo boost gauge drops from near the max on the gauge to about mid point. I get no warning of overboost . It does not seem to repeat this in any other gear so its a bit odd. Any ideas. I do get a distinct, but not loud, turbo whine when cold . I have a TDI diesel tuning box fitted but have not had the same symptoms on my 156 jtd which is similalry fitted/