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There are a couple of YouTube videos where people have removed the screen altogether. It seems to work fine, but some of the owners claim that there might be an increase in oil consumption. Nothing scientific, just their impression.
My feeling is that if Audi went to the trouble to redesign a new screen (creating a new part number, engineering, etc.) then I should probably use it. Perhaps it helps regulate the amount of oil sent to the turbos?
If you have no faith in either screen, perhaps using something like the JHM filter relocation kit might be a better option than no screen at all.
You have good points there.
Journal bearings require a lot of oil to operate, ball bearings dont and thats why they have restrictors in oil feed. The lines going to the turbos arent that big diameter so I dont think there can be too much oil going in. All info related to this engine is ofc welcome.
With my use, I will have so little mileage per year so it might be the best to use the new design screen that Audi engineered. I will change oils once a year with ~2000miles of driving.
My personal opinion is that the JHM relocvation kit is just BS.. Wayyyy too overpriced for couple of hydraulic lines. 150usd and I would buy it, 550 hell no. They make it so pricey "because they can and the subject is alarming overall", I dont care that kind of business model. And no, its not that big of a invention that the research and engineering would have taken millions to come up with that product.
Hi all! So, I just bought my first 4.0T. 2014 S8. It has 130k miles and the screen has never been cleaned. I checked the both turbos axle play (side to side and in/out) and the compressor wheel doesnt hit the housing but its pretty close. You can probably fit something there that has the thickness of a bible page, nothing thicker. In/out play is zero, cant feel it by hand. It seems that I have to check the screen (replace the valve under the screen and ofc new oil separator just in case) and maybe start looking for new turbos because the current ones dont have that much life left. My question is that because Audi have ditched that screen after 2016, is there any reason to update the screen to the never version vs remove it completely? Any thoughts?
That amount of movement is normal. With oil pressure in the bushing area, there is much less side-to-side movement during operation.
Journal bearings require a lot of oil to operate, ball bearings dont and thats why they have restrictors in oil feed. The lines going to the turbos arent that big diameter so I dont think there can be too much oil going in. All info related to this engine is ofc welcome.
My personal opinion is that the JHM relocvation kit is just BS.. Wayyyy too overpriced for couple of hydraulic lines. 150usd and I would buy it, 550 hell no. They make it so pricey "because they can and the subject is alarming overall", I dont care that kind of business model. And no, its not that big of a invention that the research and engineering would have taken millions to come up with that product.
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The screen should present no restriction to oil flow. Not the design, not its purpose.
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The kit isn't priced exorbitantly, considering all the custom welded stainless parts. Heck, you can't even buy an ashtray for this car for $150. You gotta pay to play.
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The screen should present no restriction to oil flow. Not the design, not its purpose.
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The kit isn't priced exorbitantly, considering all the custom welded stainless parts. Heck, you can't even buy an ashtray for this car for $150. You gotta pay to play.
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And also the screen protects the valve so the valve doesnt stuck open. I might pick the new screen route here and check the screen after a year or two.
Btw, is it true that all the 4.0TFSI exhaust manifold/turbine housings are the same? Atleast the turbine wheels have the same diameter and after googling, ppl say that its same in every model.
And also the screen protects the valve so the valve doesnt stuck open.
...is it true that all the 4.0TFSI exhaust manifold/turbine housings are the same? Atleast the turbine wheels have the same diameter and after googling, ppl say that its same in every model.
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What valve? There is no valve post-screen.
. The RS6/7 turbos have a larger diameter compressor fan.
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What valve? There is no valve post-screen.
. The RS6/7 turbos have a larger diameter compressor fan.
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Its pre screen and yes, the screen protects also that valve when engine is not running so all the gunk hot oil creates, dont end up jamming the valve and preventing it closing.
Can you even read? Im talking about exhaust manifold and turbine housing, not compressor side...
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Interesting theory you have there on the turbo screen protecting the backflow valve. Maybe you could get a job with Audi
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Yes, I have a reasonably good command of the English language. If you will re-read my answer, you might understand that I was only adding what I knew, and not contradicting you.
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Welcome to the board.
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Interesting theory you have there on the turbo screen protecting the backflow valve. Maybe you could get a job with Audi
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Yes, I have a reasonably good command of the English language. If you will re-read my answer, you might understand that I was only adding what I knew, and not contradicting you.
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Welcome to the board.
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My apologies, not trying to ruin anyones day. Just trying to get that freaking thing back on the road and ofc learn s much as possible. I have been googling for hours about this subject and 4.0TFSI overall.
Yes, Im aware about the compressor options and im getting used exhaust manifolds and RS7 cores+comp housings. Then I have one set of turbos stored when something hits the fan. Also im getting cores waiting for my current S8 turbos so I can swap them immediately and no need to wait for replacements or getting them repaired. If I dont need the spares (sell the car etc), I will get rid of those turbo parts pretty easily, I think.
Thanks, this thread and forum has been very informative.
I had 93,000 miles on my A8L, on a road trip driving through Kentucky when both turbos failed on the interstate. I bought the car brand new in 2015, no modifications. Love the car. I had the car towed to the nearest Audi dealership, and then took a rental car and drove back to Iowa (home). I was really disappointed with the repair cost obviously, but the car is solid and still has the same firm, solid ride as when brand new. It was the only challenge with the car that I have had so far besides regular maintenance, replacing the tires (twice) and then finally the brakes (91,000) in 2021. After paying the turbo replacement bill I seriously thought I was done with this car, but I plan on keeping it for another 50 to 100K miles and then go electric. I had the wheels painted at 98,000 so the car would feel "new" to me. I currently have 102,000 miles.
01-07-2022, 12:29 AM
There is no valve post-screen.
I have been googling for hours about this subject and 4.0TFSI overall.
