Recently put an OEM turbo on our 2007 VW EOS. It’s not got as much power now. Is there an adjustment or anything we can do? It’s half the car it was before.
Sorry. I guess I should’ve started with that. I took it to a shop because it was burning a quart of oil a week. The turbo tubes were full of oil. I didn’t complete the work myself. I asked him about the performance and he said it’s a factory turbo and there’s no adjustments for it. I’d have to buy an adjustable waste gate if I want to up the performance.For that kind of money, investing in your own VW compatible diagnostics and learning to use it is a small extra price to pay? You haven't said why you replaced it and again with some fault exceptions like oil seal leaks and bearings, diagnostics can give a lot of performance information before you even start with the wrench.
If you took your car to a competent shop for repair, that's what they would do with all the diagnostics software and other tools available to them. Buying a part and bolting it on yourself, you won't know what's going on without measurements or if there was an ancilliary part involved which you missed, didn't check at the time, or accidentally damaged?
I'd bet it's not the turbo? When you buy an expensive OE part from a dealer, once you open the package it's yours with no returns. Ensuring the replacement part numbers are correct is always a risk you take. Since you've been working on the manifolds, there are other components to be careful with. I always read the shop manual first, because there are often traps to fall into with seemingly straight forward tasks.
Measure your turbo with diagnostics and come back with some results or faults if any are shown?
It’s stock as far as I can tell. It’s got 195k miles on it. We replaced the turbo sensor a few times because it was ruined by oil. The mechanic said it was the turbo failing causing the oil issues. He said he flushed 3 quarts of oil out of the tubes when he replaced the turbo. He said our waste gate wasn’t adjustable and that we could get more performance out of it it we switched to an adjustable one. I’m going to take it somewhere else that specializes in VW’s and see if they can figure it out. Thank you.Most here will assume a stock setup with no tuning tweaks because you can't ask for help if any tuning mods were done before. Even diagnostics and out of range errors it may give only relate to what V.W software expects from a standard factory setup. If you think your performance before came from tuning tweaks and waste gate (i.e boost) changes, then you need help from a tuning specialist. You should be able to tell looking at the old parts if anything has been replaced for something else. In fact, do you know if your car is stock or has been tuned? Diagnostics measurements will tell you if the waste gate is working correctly and limits at the V.W spec. boost pressure.
I've done some recent work on a V.W turbo diesel. The turbo principles are the same. Many will condemn their expensive turbo for suspected oil leaks past seals. This isn't always the case although high mileage makes it more likely. The turbo oil return to the crank case could be blocked, or there's excessive crank case back pressure due to a failed PCV or blown engine. Lift the oil cap on idle, if there's lots of positive pressure blow back on idle, that's the first issue to look at. If somebody has overtuned your engine it might have suffered?
First question I would ask is if the turbo is the same part number as the turbo that was removed and/or confirmed as the correct item? If the turbo and tune had been changed in the past, an OE turbo may not be compatible.Recently put an OEM turbo on our 2007 VW EOS. It’s not got as much power now. Is there an adjustment or anything we can do? It’s half the car it was before.
Certainly that much oil is a significant concern and knowing for certain its origin (and on the surface it seems logical the turbo was the cause) is key in this situation. On the surface though, one would think that with a new turbo and all that oil flushed out of the intercooler that performance would be improved. Thus my reasoning in saying a VW specialist is needed to run diagnostics and determine what issues exist in this engine.All true but 3 quarts of engine oil in the inlet and inter cooler core isn't going to help. If the mechanic who replaced the expensive new turbo was competent, he should have checked part numbers and know what that amount of engine oil on the induction side could do? Many make the mistake of sourcing a part themselves which then leaves the mechanic charging up labor without any responsibility for everything working, or a warranty afterwards. If you know what you are doing with a used part it can work. But on an expensive dealer price part I would have left all the decisions and risk to the mechanic?
He may have spent a lot of labor time fitting the new turbo and just left alone the work to thoroughly clean out the induction side as soon as he tried the engine and it ran?