Noz Posted October 5, 2020 Share Posted October 5, 2020 Sadly due to some spirited driving (missed a gear) I had some smoke from my engine. Turns out, the turbine clips have been damaged on the turbo due to excessive oil pressure (feedback from OCDworks). So, going to have it repaired and get me back on the road. But I don't want this to happen again. Thoughts on the cause, was it purely a missed gear? I do have a rev limited of 7.2k. Maybe needs lowering? Would this even benefit me? I `might` have had a few pops and bangs (anti lag) beforehand but I didn't see any smoke at that point and the car did idle for a few minutes before. So I doubt this is the cause (but correct me if this seems more likely). They're going to rebuild the turbo and I'm super excited to have it back. I'm just fault finding with you guys as Google brings up tons of causes. A bit like when you have a cold, and Google gives you 50 diseases you may have with your symptoms. Feedback welcome! Quote Link to comment Share on other sites More sharing options...
Style Posted October 6, 2020 Share Posted October 6, 2020 That's not so good, hopefully not too expensive to get back on the road. Never heard of a turbine clip before, or is it just the blades? High oil pressure leading to turbine damage sounds a bit strange, I'd have thought you'd have smoke from oil passing the seals due to excess pressure and that's about it really. Unless it blew the seals to bits, leading to play in the wheel which then caused the damage. That would've been progressive though and you'd certainly notice it. I've blown a turbo seal and smoke-screened the entire workshop in minutes when it happened. Are the drain and feed lines a good size? I really can't see a high rev limit causing something like that and line sizes are about all I can think of that leads to oil pressure issues. Damage from low pressure is a bit more believable. Quote Link to comment Share on other sites More sharing options...
Steve Posted October 6, 2020 Share Posted October 6, 2020 Does your turbo have an oil restrictor on the feed line? Quote Link to comment Share on other sites More sharing options...
Noz Posted October 6, 2020 Author Share Posted October 6, 2020 That's not so good, hopefully not too expensive to get back on the road. Never heard of a turbine clip before, or is it just the blades? High oil pressure leading to turbine damage sounds a bit strange, I'd have thought you'd have smoke from oil passing the seals due to excess pressure and that's about it really. Unless it blew the seals to bits, leading to play in the wheel which then caused the damage. That would've been progressive though and you'd certainly notice it. I've blown a turbo seal and smoke-screened the entire workshop in minutes when it happened. Are the drain and feed lines a good size? I really can't see a high rev limit causing something like that and line sizes are about all I can think of that leads to oil pressure issues. Damage from low pressure is a bit more believable. More expensive than im willing to admit. That's for sure. I'm assuming clip along the shaft axis. Going to replace all the bearings anyway. A full refresh. Be good as new anyway so. Smoke wasn't as aggressive as yours mate. Yeah drains fair size. An10 I think. I dont see why there'd be an issue but I'll likely swap it for bigger anyway now. Quote Link to comment Share on other sites More sharing options...
Noz Posted October 6, 2020 Author Share Posted October 6, 2020 (edited) Double post Edited October 6, 2020 by Noz (see edit history) Quote Link to comment Share on other sites More sharing options...
tayr Posted October 6, 2020 Share Posted October 6, 2020 Thats what happens with an ebay turbo build Quote Link to comment Share on other sites More sharing options...
Steve Posted October 6, 2020 Share Posted October 6, 2020 More expensive than im willing to admit. That's for sure. I'm assuming clip along the shaft axis. Going to replace all the bearings anyway. A full refresh. Be good as new anyway so. Smoke wasn't as aggressive as yours mate. Yeah drains fair size. An10 I think. I dont see why there'd be an issue but I'll likely swap it for bigger anyway now. No mate. Just open fitting. What turbo is it? What size is the feed line? Some do require a restrictor on the feed. Quote Link to comment Share on other sites More sharing options...
Noz Posted October 6, 2020 Author Share Posted October 6, 2020 Thats what happens with an ebay turbo build That turbo was sold and is still running fine cheeky sod. Splashed out on a decent turbo. Quote Link to comment Share on other sites More sharing options...
Noz Posted October 6, 2020 Author Share Posted October 6, 2020 What turbo is it? What size is the feed line? Some do require a restrictor on the feed. 62mm turbo. OCDworks 6251r. AN4 for the line I believe. Quote Link to comment Share on other sites More sharing options...
Steve Posted October 6, 2020 Share Posted October 6, 2020 62mm turbo. OCDworks 6251r. AN4 for the line I believe. Be worth checking with OCD then to see if it requires one. DBB turbos used to always require them. Quote Link to comment Share on other sites More sharing options...
Noz Posted October 6, 2020 Author Share Posted October 6, 2020 Yeah I've given them an ask. I may fit one anyway if that's the industry standard. I'll look to make the return bigger, even if its just to allow more room during the bend. I wonder if it's worth adding an oil pressure sensor, I guess with a restrictor fitting it wouldn't be worth it. Is there any risk adding a restrictor not supplying enough oil to the turbo? Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted October 6, 2020 Share Posted October 6, 2020 Dont know what turbo clips are, but I dont think excessive pressure can damage turbo other than blow the seal? Have you changed the oil pump as well, as if you dont you're not addressing the problem (if that was the problem.) If you're ECU monitors oil pressure you can see what it was, but there should be a relief valve to avoid over pressure. Pops and bang will definitely shorten the life of a turbo, so I'd put my money on that being the cause. I simply dont understand anti lag on a road car Quote Link to comment Share on other sites More sharing options...
Noz Posted October 6, 2020 Author Share Posted October 6, 2020 Haven't changed the pump. Did plan too. Planned a big spend this winter. I'm no turbo expert but I've no idea wtf clips are either. From an assembly point of view I'm curious what they even mean. Unless its a circlip style clip thsts got damaged from the oil passing by. Either way. Its sorted now so I'll just be a bit more sensible until pump replacement. Tempted to just get it running and stop hammering it so hard and enjoy the odd dry day and resolve a new pump next year. Its more for fun than function. But agree its not really worth it. Brake boosting feels the same as rolling anti lag from a performance viewpoint. Its better for launching really I guess. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted October 6, 2020 Share Posted October 6, 2020 Does the ECU monitor oil pressure? Quote Link to comment Share on other sites More sharing options...
Noz Posted October 7, 2020 Author Share Posted October 7, 2020 Yes mate. Good shout. Not sure how much time the S6 stores. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted October 7, 2020 Share Posted October 7, 2020 Iyt should hopefully have a peak hold function where you can see the highest recorded pressure Quote Link to comment Share on other sites More sharing options...
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