After the remap I decided to give the ECU controlled Vacuum solenoid another try to get the VNT working the way it should according to load rather than the full vacuum pulling the VNT hard on from the start. Have found the original boost anomaly is still there but greatly changed since the remap and switching off of the EGR, meaning the sudden drop comes back immediately, it doesn't hang on, still investigating what is causing this small anomaly . This vid shows the hiccup, but it does not effect the EGT the way it used to in the old days. On a recent 1200k trip the max EGT I saw was just over 400c. I have since permanently reconnected the Vac solenoid into the system but moved it very close to the VNT and Dawes (which I'm still using to control maximum boost) to shorten the tube runs, working well, smooth boost application and a slight improvement in eco due to the VNT dancing to the tune of load demand. More to come on this project.
10 сен 2024