GannMann

In second and third gear when the engine is stressed(like going up a hill)just as the turbo is about to kick in I hear this "funny noise",like a grinding sound and the car loses power for a second and then it's OK.....Also I raced this guy at a stoplight and really lost power in third gear at about 4,000rpms??

Tx2

Doesn't really sound like the DV problem to me, have dealer check it out.

dmkozak

Your turbo starts spinning at quite low rpms. It should have already "kicked in" under normal driving, unless you're really lugging the engine.

TTS

I am struggling, as is the dealer, to find the problem. Thought it might be the APR ECU, but happens with the stock ECU. Put the stock DV back in as well as it still does it. Usually when I have run it hard for a few miles. I think it may be anti-detonation (PING) kicking in, next step is to get some racing fuel and see if it happens. I'll let you know how I do.

Miles Borne

Did you notice if the ESP light came on on the dash?
ESP has been known to malfunction and there could be several possibilities why. On the other hand if you were not travelling in a straight line it might not be a malfunction.
I think what you describe could fit the ESP hypothesis...
Take to the dealer or try turning off ESP.

john s

Sounds like the wastegate is opening, check for shorts in wire to N75.

sledhead

Did power come back around 5600 RPM?