Mistral Posted October 20 Share Posted October 20 Hello everyone, I am seeking assistance as I am perplexed and uncertain about the next steps with my vehicle. Replaced turbos, charge cooler with new OEM components, charge pipes and J-pipe; the issue was equally evident with the previous hardware. The vehicle is experiencing underboost in the low RPM range, and smoke tests have revealed no leaks. The vehicle exhibits no fault codes, which exacerbates the frustration. Any alternative perspectives or suggestions would be appreciated. The attached log is a WOT pull in third gear in sport+ mode, with traction control disabled. The vehicle has a 50,000-mile competition history, has never been mapped, and has only had a software upgrade in 2019. The oil pressure is satisfactory; nevertheless, it was not documented in this log. Quote Link to comment Share on other sites More sharing options...
Mistral Posted October 20 Author Share Posted October 20 Quote Link to comment Share on other sites More sharing options...
dave783 Posted October 20 Share Posted October 20 Upon reviewing the logs and acknowledging your assertion of no hoover or boost leaks, the most probable causes are as follows: Boost control solenoid 2) Damaged diaphragm within diverter valve Quote Link to comment Share on other sites More sharing options...
Mistral Posted October 20 Author Share Posted October 20 Boost is regulated using electronic wastegate actuators controlled by the DME, without the use of external diverter valves or boost control solenoids, unlike previous engines, to my knowledge. Quote Link to comment Share on other sites More sharing options...
dave783 Posted October 20 Share Posted October 20 Electronic diverter valves, if not sealing correctly, may cause your issue without generating error messages. When utilising ista, you can instruct them to open and close. Should this not be the case, eliminate them and examine the seals. Quote Link to comment Share on other sites More sharing options...
Mistral Posted October 20 Author Share Posted October 20 Are you referring to the wastegate actuators? Indeed, both are calibrated within a tolerance of +/-0.5mm when the service function is executed, and both exhibit visible movement when actuated through Ista. They appear to be fluid rather than abrupt. This is also evident when the ignition is activated, as they undergo a cycling process, correct? Quote Link to comment Share on other sites More sharing options...
Mistral Posted October 20 Author Share Posted October 20 Are you referring to the wastegate actuators? Indeed, both are calibrated within a tolerance of +/-0.5mm when the service function is executed, and both exhibit visible movement when actuated through Ista. They appear to be fluid rather than abrupt. This is also evident when the ignition is activated, as they cycle, correct? Quote Link to comment Share on other sites More sharing options...
dave783 Posted October 20 Share Posted October 20 I will locate the boost solenoid; with the engine idling, place your hand on it. If it is functioning, you will sense a pulsing sensation, accompanied by a continuous ticking or clicking sound if operating correctly. Quote Link to comment Share on other sites More sharing options...
dave783 Posted October 20 Share Posted October 20 🫠Quote Link to comment Share on other sites More sharing options...
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