whats all the fuss about ?through no fault of our own after relatively few miles and dependent on conditions the inlet tract on TFSI engines starts to foul up.
dont think its just a high mileage issue , its happening to us all.
heres jonnyc S3 8P (still the 2.0 TFSI) intake valve from a stripdown at xx,xxx miles :
jonnyc's S3 stripped
why ?heres a useful diagram.
The key thing to remember is that the TFSI doesnt have a catch can (but everything else is relevant) , and oil fumes / water vapour and related gumph are ported back into the engine to try and achieve good emissions...
On most cars this is not a problem as fuel washes constantly keeping everything clean.
The bad news is that TFSI is direct fuel injection (injectors spray directly into the combustion chamber), so the only thing passing the intake valves is air (and the oil and water vapour gunk), this is really bad news.
(thanks Robin
)
this happens to both standard or remapped cars, but the increased boost pressure is liable to make the issue worse.
How does this work on the 2.0 TFSI ????heres some info on another thread , with a
>> diagram of flow <<possible solutionsThe solution is to try and reduce or stop the amount of oil and water vapour fumes making their way back into the intake system...
MOT compliant optionsEuroJet PCV valve uprated check valve & hose in the OEM location
£40
This works by raising the pressure level at which the fumes are recirculated.
Forge oil seperator manifold and catch tank has a level viewing function
(not yet available but coming soon)
cost unknown
Works by seperating oil and water vapour and holding them for draining.
BSH Stage 1 BSH Stage 2 (note there is an upgrade kit available from stage1 , which I presume adds a modified 'plate' and a catch can)
Works by seperating oil and water vapour and holding them for draining
(there also appears to be a high capacity catch can with dipstick measure (from 7 to 32 floz) kit available , those above use the small catch can)
Non MOT compliant BSH Race version Works by seperating oil and water vapour and holding them for draining.
or DIY vent to air!
General Info General BSH PCV page
http://www.bshspeedshop.com/store/home.php?cat=1011 BSH have 2 different catch can sizes
standard :
volume = xxml
260mm deep (top to bottom inc the top hose connection and bottom drain valve)
95mm wide (at the widest point where the connections are)
50mm wide (across the narrowest point)
no dipstick or viewing method , just open drain to empty
large :
size : TODO
increased volume of xxml
dipstick to measure fluid level
open drain to empty
I think the smaller can is more than adequate for most folk provided you drain it every 1500 miles or so initially.
What's captured in the can really varies from car to car, what type of driving you do and time of year (you collect more during the colder months vs summer). You should get a feel after 2-3 draining on how much "stuff" you're collecting though I do wish the can came with a view window.
If the can fills up then only the excess collection after that point will go back through the return hose to the inlet valve port but hopefully with due diligence it should never get to that point.
many people on this forum entered into the Group Buy organised by Dubtek for the BSH product
BSH PCV Stage 2 Fix Catch Can System Group Buy SeafoamingThis is an agressive detergent that has been discussed as a possible way to remove deposits from the intake system.
It is not proven (scientifically by VW at any rate) , so its done at your own risk!
seafoam discussion on mkv.comuseful links golfmkv.com : common issues : PCV failure BSH PCV fix possible ebay / group buy thread... Actual GB for BSH PCV solutions .... BSH Catch tank alternative locations by Stokeballon Oil forum thread showing deposits on a Porsche DI engineinstall comments by monkgti Audi S3 install by WarrenCox Catch Can Fitting for Octavia vRS by Mater install comments by RedRobn Cupra install by DaveyCupra Topic: Emptied my Catch Can Today……some good pics from KRL Water Methanol kits discussion : keeps your engine clean.....
