Hey everyone, I have a weird issue that started about a month ago. The vanes started cycling non stop while i'm at an idle. It doesn't do it everytime i'm at idle and some days it won't do it at all.
The truck is an 06 LBZ that I tune myself with EFI live, it has quite a few mods but im only pushing about 500hp. After the vanes began cycling like this I removed the intake horn and found I had axial play on the shaft, I just pulled it 2 weekends ago and rebuilt it with a kit from midwest turbo. I also ported and polished the housings while it was out and I completely cleaned the turbine side as well as assembled with nickle anti sieze. There was no evidence of the vanes or unison ring sticking at all when I disassembled.
Prior to the rebuild I would use my Tech 2 and EFI live V2 to command vane position and even at idle the turbo would do what I commanded it to do. I have tried different tunes including the stock tune and it still does the same thing. Vane position seems to follow my tune quite well and I am not low on power at all. It is just annoying more than anything and I would like to get it figured out before it causes an issue. It will cycle (or try to) almost once every 2 seconds and once it starts it doesn't stop cycling until I hit the throttle or start to drive (even when switching tunes with my dsp switch). It won't always reach 100% either, sometimes it will only reach in the 70% range, or 80% it isn't consistent at all.
I have also installed another vane position sensor that I had laying around and performed the turbo relearn with my tech 2. I am very familiar with these trucks and turbos and have done a lot of work on them but have never seen this issue, almost makes me think my ecm is acting up. Please chime in if you have ever had this issue or have any input, thank you!
The truck is an 06 LBZ that I tune myself with EFI live, it has quite a few mods but im only pushing about 500hp. After the vanes began cycling like this I removed the intake horn and found I had axial play on the shaft, I just pulled it 2 weekends ago and rebuilt it with a kit from midwest turbo. I also ported and polished the housings while it was out and I completely cleaned the turbine side as well as assembled with nickle anti sieze. There was no evidence of the vanes or unison ring sticking at all when I disassembled.
Prior to the rebuild I would use my Tech 2 and EFI live V2 to command vane position and even at idle the turbo would do what I commanded it to do. I have tried different tunes including the stock tune and it still does the same thing. Vane position seems to follow my tune quite well and I am not low on power at all. It is just annoying more than anything and I would like to get it figured out before it causes an issue. It will cycle (or try to) almost once every 2 seconds and once it starts it doesn't stop cycling until I hit the throttle or start to drive (even when switching tunes with my dsp switch). It won't always reach 100% either, sometimes it will only reach in the 70% range, or 80% it isn't consistent at all.
I have also installed another vane position sensor that I had laying around and performed the turbo relearn with my tech 2. I am very familiar with these trucks and turbos and have done a lot of work on them but have never seen this issue, almost makes me think my ecm is acting up. Please chime in if you have ever had this issue or have any input, thank you!
