Is it good idea to adjust the wastegate on your 2002 landrover discovery td5?

Answer 1

No it is not a good Idea to tamper with the Waste-Gate Actuator, I have a Disco TD5 which I purchased second hand, and someone had tampered with the adjustment on the actuator, the Boost control valve had also been by-passed as it was faulty. I have since spent a year trying to get my TD5 back to spec, as it was extremely sluggish when I first got her. I have replaced the boost control valve with a new one, and have spent spent a lot of time trying to find out exactly how the actuator should be adjusted, there seems to be no definitive answer to this question. I fitted a Madman Engine management system with a VDO boost pressure sensor to get an accurate boost reading, and found that my boost pressure was only 0.1 Bar at 2300 RPM, and only got to 0.9 Bar at 2900 - 3000 RPM. This pointed me to the waste-gate not operating correctly or the Turbo not boosting. I decided to look at the waste-gate first as this was the easiest. I connected a second Boost pressure gauge between the Boost control Valve and the Actuator, to monitor if and when the boost control valve was working, I then started adjusting the actuator arm, and have now got full boost pressure of 1.0 Bar all the way from 2000 RPM to 4000 RPM. I also have boost pressure rising from 1700 RPM. I felt really good when I cane across the following post one www.Landyzone.co.uk: http://www.landyzone.co.uk/lz/f7/still-struggling-my-td5-40605.html"I suggest some smart-arse has failed to understand that the boost pressure is controlled by the ECU in a TD5, and has screwed the waste-gate rod way too far, allowing it to over-rule the ECU and hit 20+ psi even though the ECU tries to hold it down to about 15 - 16 psi, just over 1 BAR. This tells the ECU that summat is askew, and it shuts down to limp mode. I think you want to make the rod LONGER by at least half an inch, and see what happens. Properly set, at 1800 - 2000 revs or more with the pedal decked, the boost gauge should hit about 1 BAR / 15psi and then the needle should visibly vibrate as the ECU flutters the waste gate valve to keep it under control at that pressure. When you reach this stage, call it a day! CharlesY "