OK, you may or may not know that I've put a twin turbo setup on my EA. It's all bolted in however it's still not plumbed up to the intake....so the car's still N/A just with two hairdryers hanging off the side. Just a bit of a run down, it's using two Garrett T28 N1 spec GTR turbos, mounted on separate manifolds being fed from 3 cylinders each. So one turbo sits infront of the other alongside the engine.
Anyway, I've been driving the car like this for a bit (with the wastegates constantly open), and what I've noticed is that the front turbo gets A LOT hotter than the rear one. The turbos are oil and water cooled and I have checked the oil feed lines and also the water lines for blockages and both are fine. When I turn the car off after a drive, the front turbo makes a lot of 'sizzling' noises like something is leaking out while the rear one is quiet. Although I can't see any leaks except for a small amount of oil around the oil feed line.
What I have noticed is that when the car's idling, if I put my finger on the front turbo's compressor wheel to stop it spinning, it will stay stopped until you either rev the engine or give it a flick to start it spinning again. If I do the same thing to the rear turbo, as soon as I let the compressor wheel go, it will spin up again.
I believe both turbos have been rebuilt recently as there is no shaft play and there are paint markings over the compressor wheel nuts (for warranty purposes I'm guessing).
Now I'm no where near a turbo expert so this might be way off, but is it possible that some dumbass has put the turbine wheel on the front turbo on backwards.....so that it's not spinning properly and maybe the exhaust gas is just kind of sitting in the turbine housing for too long causing it to heat up excessively?
Or could it be something else totally different?
Cheers,
Doug
Anyway, I've been driving the car like this for a bit (with the wastegates constantly open), and what I've noticed is that the front turbo gets A LOT hotter than the rear one. The turbos are oil and water cooled and I have checked the oil feed lines and also the water lines for blockages and both are fine. When I turn the car off after a drive, the front turbo makes a lot of 'sizzling' noises like something is leaking out while the rear one is quiet. Although I can't see any leaks except for a small amount of oil around the oil feed line.
What I have noticed is that when the car's idling, if I put my finger on the front turbo's compressor wheel to stop it spinning, it will stay stopped until you either rev the engine or give it a flick to start it spinning again. If I do the same thing to the rear turbo, as soon as I let the compressor wheel go, it will spin up again.
I believe both turbos have been rebuilt recently as there is no shaft play and there are paint markings over the compressor wheel nuts (for warranty purposes I'm guessing).
Now I'm no where near a turbo expert so this might be way off, but is it possible that some dumbass has put the turbine wheel on the front turbo on backwards.....so that it's not spinning properly and maybe the exhaust gas is just kind of sitting in the turbine housing for too long causing it to heat up excessively?
Or could it be something else totally different?
Cheers,
Doug