Hi everybody!
my FD still no recover, after the Dyno test. i'm try to test the compression test the result show 8.2-8.0-8.0 is o.k.?
i'm try to change the plugs and turbo gasket only the idel show stable. but the presssure meter still show
"-0.5 to -0.7" very untable and i'm hear the sound same "knock knock........." the power FC show the pressure is -0.21 to -0.29. i'm try to drive the car but the boost up very slowly and only to go to 0.7 bar.
(before 0.85).

please help me ! i'm very upset in this time.

 

is the compression the same in both housings? 8.0 kgf/cm2 is good compression. sounds like maybe a vacuum/boost leak somewhere. can you duplicate the "knock knock" sound by revving in neutral? if so get someone to look under the hood while you rev it to see where the sound is coming from. something could be loose. just my 2cents
good luck

 

Thankyou very much Airborne;
i'm very happy for your helpful.
the technician con not found out the problem where come from. now if change turbo kit can i improve the ploblem? the engine already run 75000 can it receive new tunning?

 

Jack Pang,

Off course u can have a new tunning, but why dont u find out what causes the 'knocking' sound before u do the tunning?

 

9413btt:
anyway i will find out the problem from the turbo. install new turbo kit is the last choose.

 

I remember from my piston days that exhaust leaks tended to sound like a metal ticking sound at each exhaust pulse. An exhaust leak wold contribute to slow spool up as well. Can't think why that would screw up the vacuum signal though...