Roverdrive Posted December 16, 2016 Share Posted December 16, 2016 Hi a quick update of the saga so far. My 110 had always been a bit smokey under power, but fine off boost. I had a look at the fuel pump, and sure enough it had been twiddled with. I turned the top back about 30 degrees towards the original witness mark on the conical pin, and things were improved, though there was a small loss in acceleration. That was where I left it until sourcing an EGT gauge, and now a boost gauge. The max EGT was 770 degrees on a long hill towing, so I shudder to think what it was before turning the top of the pump back. I have now finally got a boost gauge, and have adjusted the wastegate push rod to give additional boost. I made an adjustment of two turns shortening the rod, and went back to the same incline. Boost has increased from 1 bar to 1.1~ 1.2 bar, and the EGT has dropped to 695 degrees. It's too dark to discern the smoke now, but looking at the headlights behind, it seems to be greatly improved. more fettling tomorrow to see if the initial acceleration can be improved. Mike Quote Link to comment Share on other sites More sharing options...
Roverdrive Posted December 17, 2016 Author Share Posted December 17, 2016 Well it looks as though I have to go back to the drawing board. The max boost is fluctuating. Some times on acceleration it will go to 1.2 bar, and other times only just over 1 bar. This shows in the max exhaust temperatures being 695 up 750 degrees (still better than before) it looks like I will have to go for a replacement boost capsule rather than the rather crude method of adjusting the length of the rod. does anyone know of a source for these, or otherwise the variable boost controllers that can be put in line from the boost side to the wastegate? Mike Quote Link to comment Share on other sites More sharing options...
Peaklander Posted December 17, 2016 Share Posted December 17, 2016 I have read that if the wastegate actuating arm is too long then there isn't enough load on the wastegate spring and this can cause pressure fluctuations. As you've shortened it then perhaps this isn't the source of your woes but it's a starter for ten. Someone with proper experience will hopefully come along and help Quote Link to comment Share on other sites More sharing options...
Roverdrive Posted December 17, 2016 Author Share Posted December 17, 2016 Will put it back 1 turn tomorrow and see what that does. Before I adjusted the rod length, the boost was steady at 1 bar, so it seems to have been a result of the changes. Quote Link to comment Share on other sites More sharing options...
cborrman Posted August 20, 2022 Share Posted August 20, 2022 Has anyone found / made a tool to adjust the rod without taking the manifold off? I have had mine 1) too long - terrible turbo lag and smoke, but when it kicked in it was impressive and could cruise another 10-15mph faster without going over 700C on EGT 2) now too short, lower power but higher EGT. Sadly I did take it to a "specialist" to tweak the turbo pressure and all he did was play with the then still untouched fuel pump which I could have done myself... ho hum. With the boost pin and ring I notice the wastegate is actuating a little too early... so if anyone has a way of adjusting without taking bits off... will make my journeys home a lot more fun Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted August 20, 2022 Share Posted August 20, 2022 I use a boost valve to control my boost as it saves lying across the engine trying to adjust the threaded rod. Cap head on the left side of it adjusts boost. I used this one because it looked suitably agricultural, its British and it was cost effective (cheap 😉) https://www.ebay.co.uk/itm/220537042109?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=VBdYtBupQcq&sssrc=2349624&ssuid=9yXbXNDuQSq&var=&widget_ver=artemis&media=COPY HTH Mo Quote Link to comment Share on other sites More sharing options...
92a Posted August 27, 2022 Share Posted August 27, 2022 Have you got a boost gauge to see what you’re getting at the manifold? I bought a banjo off eBay 2 bar guage and ran a pipe through the vent , my 200tdi has 20psi but my 300tdi only has just over 1 bar both on the same long hill Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted August 27, 2022 Share Posted August 27, 2022 58 minutes ago, 92a said: I bought a banjo off eBay 5 stars for Deliverance ? 😬 Mo 2 2 Quote Link to comment Share on other sites More sharing options...
92a Posted August 27, 2022 Share Posted August 27, 2022 Hi Mo , great reply and I’ll in touch once I can play it a bit better, Angus 1 Quote Link to comment Share on other sites More sharing options...
Troll Hunter Posted August 29, 2022 Share Posted August 29, 2022 I've read the thread and the write-up on the Mumby site. I don't want to increase my total boost pressure but I do want to delay the time that the wastegate starts to open. Does this bit of kit provide this facility? Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted August 29, 2022 Share Posted August 29, 2022 Hi Mike I don't think it does specifically unless you're referring to wastegate creep which it does by not opening until boost pressure exceeds the spring preload pressure. I find boost climbs smoothly to the set maximum pressure and then stops as It reaches its preset limit. I'm no expert or connected in any way. HTH Mo Quote Link to comment Share on other sites More sharing options...
Troll Hunter Posted September 3, 2022 Share Posted September 3, 2022 Many thanks for your thoughts, Mo. I believe that the wastegate on a 300Tdi starts to open at about 9psi boost and is fully open at 14+psi boost. I would like to delay the start of opening of the wastegate, perhaps to 11 psi boost, so that maximum torque/power is maintained for longer. One method I had considered was to shorten the spring in the wastegate actuator by adding a spacer at one end, but the fabrication of the actuator body ended that line of thought! I'd appreciate any suggestions on how to do this. Mike Quote Link to comment Share on other sites More sharing options...
Peaklander Posted September 3, 2022 Share Posted September 3, 2022 As i understand it and I have the same device as @Mo Murphy, the purpose is to allow the user to set the pressure at which air is admitted to the wastegate actuator. Until this set pressure is reached, no air is admitted and the wastegate remains closed. Once the desired pressure is reached (at whatever point the air supply is taken from), that full pressure is applied to the actuator and it will therefore move. As it's at an elevated pressure already, there will be no creep and the wastegate will open quickly. Quote Link to comment Share on other sites More sharing options...
Troll Hunter Posted September 4, 2022 Share Posted September 4, 2022 Do I understand that the air flow to the wastegate actuator is totally blocked off until the set pressure is reached and it then opens? This could be an explosive pressure increase! This is obviously not the case, so please explain further for those of us who are not up-to-speed. Mike Quote Link to comment Share on other sites More sharing options...
western Posted September 4, 2022 Share Posted September 4, 2022 Just Google it https://aet-turbos.co.uk/turbo-tech-101-what-is-a-turbo-wastegate-and-how-does-it-work/#:~:text=The wastegate is held shut,the turbine%2C regulating its speed. Quote Link to comment Share on other sites More sharing options...
Peaklander Posted September 4, 2022 Share Posted September 4, 2022 5 hours ago, Troll Hunter said: Do I understand that the air flow to the wastegate actuator is totally blocked off until the set pressure is reached and it then opens? This could be an explosive pressure increase! This is obviously not the case, so please explain further for those of us who are not up-to-speed. Why do you say "explosive pressure increase"? The wastegate is just held closed until the desired turbo pressure is reached and then it's allowed to open. This would be quicker but that's what you are trying to achieve, rather than "creeping". Quote Link to comment Share on other sites More sharing options...
Troll Hunter Posted September 5, 2022 Share Posted September 5, 2022 Thank you. I understand both the purpose and how the wastegate works. What I am seeking views on is my previous question. On 9/3/2022 at 12:01 AM, Troll Hunter said: I believe that the wastegate on a 300Tdi starts to open at about 9psi boost and is fully open at 14+psi boost. I would like to delay the start of opening of the wastegate, perhaps to 11 psi boost, so that maximum torque/power is maintained for longer. I'd appreciate any suggestions on how to do this. Mike I have also read and understand how the maximum boost pressure can be adjusted, but I am not wanting to increase this. I accept that my previous wording "explosive pressure increase" was inappropriate. What I was aiming to communicate was the rapid pressure change in the turbo system if the wastegate were to fully open very rapidly on reaching the maximum boost pressure. Mike Quote Link to comment Share on other sites More sharing options...
Peaklander Posted September 5, 2022 Share Posted September 5, 2022 I’m trying to answer that😄. As I said, the valve is set to allow a specific turbo pressure to open the wastegate. Just as you desire. Until it reaches that pressure, the wastegate doesn’t move. Then the actuator takes over and the rod moves to open the valve. That is over the working movement of the actuator from that pressure up, until the valve is fully open and dumping all the excess That’s all I know. If I’m wrong then someone will no doubt correct me (please). Quote Link to comment Share on other sites More sharing options...
Troll Hunter Posted September 6, 2022 Share Posted September 6, 2022 Thank you, Peaklander, that's also my understanding of how the wastegate opens. I've read somewhere that on the 300Tdi it starts to open at about 9 psi and is fully open at 14 +psi. Perhaps somebody can confirm or correct those pressures. Is there any way that the start of opening pressure can be raised? Mike Quote Link to comment Share on other sites More sharing options...
Peaklander Posted September 6, 2022 Share Posted September 6, 2022 (edited) On 9/3/2022 at 2:08 PM, Peaklander said: As i understand it and I have the same device as @Mo Murphy, the purpose is to allow the user to set the pressure at which air is admitted to the wastegate actuator. Until this set pressure is reached, no air is admitted and the wastegate remains closed. Once the desired pressure is reached (at whatever point the air supply is taken from), that full pressure is applied to the actuator and it will therefore move. As it's at an elevated pressure already, there will be no creep and the wastegate will open quickly. Mike what I said above is how I believe it works - and so the opening pressure is increased by adjustment on the device as it is the spring pressure that is altered to hold it closed at differing pressures. Edit: just to add that the maximum pressure is going to be defined by the turbo itself and the state of opening of the wastegate valve. Once that is fully open then it’s limited by the turbo. If you alter the rod length you can prevent the valve from ever fully opening and that can also control the maximum. Edited September 6, 2022 by Peaklander Quote Link to comment Share on other sites More sharing options...
Troll Hunter Posted September 7, 2022 Share Posted September 7, 2022 OK, thank you, Peaklander. I'll just have to try it when I get my vehicle back on the road. I may come back for some clarification at that time. I'm going to order one anyway. Mike Quote Link to comment Share on other sites More sharing options...
Peaklander Posted September 7, 2022 Share Posted September 7, 2022 I’d be happy if any more knowledgeable members would confirm what I’ve said. I hope I have understood correctly but I haven’t altered the rod length and my boost sits at around 1 Bar. Quote Link to comment Share on other sites More sharing options...
Tobias Posted September 8, 2022 Share Posted September 8, 2022 Max boost is dictated by max fuel, basically. If you increase max fuel, the max boost will go up. This device will not increase max boost as such, it will delay the opening of the wastegate, as has previously been explained. In my opinion, it is a perfectly safe way to decrease lag and make the low end a bit better. Another way to make the turbo spool earlier is to increase the fuelling at low boost, causing black smoke. This makes the opposite, increases boost, reducing the (potential) for black smoke. 2 Quote Link to comment Share on other sites More sharing options...
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