Boost oscillation/hesitation Ford Cosworth

[shadowlandz]

Hi,

The car did boost like it should untill a sudden point it overshooted a bit of boost (should peak 2.3bar; peaked 2.43 and hold 2000rpm that boost).

After that, i only have strange boost hesitation... the turbo spools -everytime- up to 0,8bar, hold something like that for a second or 2, and then builds VERY slowly up to desired boost..

I check for leaks from external wastegate, MAC solenoid,... nothing to see..

Any taughts on this?





This was 30min earlier:

[Denisuk]

Maybe there is an air leak, that opens @0.8bar? Look at your boost dc during normal and bad spool. Post your log files.