RedlineMotorworks
Go Kart Champion
TSI are a lot cleaner than FSI's. I will not be adding a catch can to my car as I plan to sell it at around 60k. I guess if you want to keep it for more than 100k miles you should? Even Arin said the other day that they are not necessary on these vehicles and even with a catch can you will still have some carbon build up.
I can almost guarantee you if APR made a catch can his response would be different.
I've seen my proof on my personal car. Granted it's an FSI but you will still catch oil in your TSI. There's no question. I haven't seen any concrete data showing that blow-by is less or more on either engine either.
A catch can will not catch 100% of the oil going from the crankcase back into the intake tract. The whole point is to substantially reduce the amount of oil that travels this route (crankcase > intake tract > engine). The less oil gunk build up you have on your intake valves, the better the car will run. Each combustion process will therefore be more efficient and the air-fuel mixture will be more pure. Adding oil into that mix will reduce the efficiency of combustion leading to less power and lower MPG. It's not like you will see a drop of 20HP but it'll be there.
The catch can will be better for your car over a long period or time but it also benefits it in the short term as well. The car will be better and cleaner combustion as well as better timing (drastically less pull and +4 degrees with the can installed).
Here's an article we wrote earlier this year: https://www.redline-motorworks.com/kb_results.asp?ID=8
It's a good read and and should answer most questions regarding catch cans.
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