Boost is gone.
Posted: Wed Feb 11, 2015 9:23 pm
Hey guys,
On the weekend I was at a tuning session and it was seriously hot, 38degC+.
All was going well, the cooling system was pretty much keeping up but at the end of 3 laps the coolant was starting to creep above 100degC so I would pull in let it drop some temp while running in idle.
I did a few more runs like this and all was going fine. After letting it all cool down again, I took to the track and had very low boost. I thought something was going wrong with the boost controller so pulled back in to inspect but everything looked ok, so I threw in the towel for the day and drove home.
The boost will come on very slowly, only a couple of psi boost at 4000rpm under load and 6-7psi at redline.
It almost feels like the wastegate actuator is not connected and the flap is fully open (but it is connected and visually is working).
I thought maybe I had a serious boost leak, so I tested the system and found a leak. It wasn't huge but was there so fixed that up and tested again, same issue, no change at all.
So I know it isn't an induction leak, I know it isn't the wastgate actuator or boost controller.
I think I am at the point where I need to pull the turbo off for an inspection. I have a spare GT2560R so might need to swap over to that and try again. I have head of some people having the wastegate flap not sealing correctly and causing all the exhaust to vent past.
Anyone have any other ideas before I do the turbo swap?
I have also bought a new 100cell high flow catalytic convertor which I will have installed next week but think a blocked cat is unlikely.
On the weekend I was at a tuning session and it was seriously hot, 38degC+.
All was going well, the cooling system was pretty much keeping up but at the end of 3 laps the coolant was starting to creep above 100degC so I would pull in let it drop some temp while running in idle.
I did a few more runs like this and all was going fine. After letting it all cool down again, I took to the track and had very low boost. I thought something was going wrong with the boost controller so pulled back in to inspect but everything looked ok, so I threw in the towel for the day and drove home.
The boost will come on very slowly, only a couple of psi boost at 4000rpm under load and 6-7psi at redline.
It almost feels like the wastegate actuator is not connected and the flap is fully open (but it is connected and visually is working).
I thought maybe I had a serious boost leak, so I tested the system and found a leak. It wasn't huge but was there so fixed that up and tested again, same issue, no change at all.
So I know it isn't an induction leak, I know it isn't the wastgate actuator or boost controller.
I think I am at the point where I need to pull the turbo off for an inspection. I have a spare GT2560R so might need to swap over to that and try again. I have head of some people having the wastegate flap not sealing correctly and causing all the exhaust to vent past.
Anyone have any other ideas before I do the turbo swap?
I have also bought a new 100cell high flow catalytic convertor which I will have installed next week but think a blocked cat is unlikely.
