2.0T Catchcan?

[ItsDubC]

Has anyone installed or considered installing a catchcan as a preventative measure w/ regards to carbon buildup? They can be had for under $100 so I would think it'd be a worthwhile mod if indeed our 2.0T TSIs are prone to the issue. Plus, some of them just look cool under the hood (there are CF ones and billet aluminum ones)

Obviously if you are leasing or don't plan on keeping the car down the stretch, you may be less concerned. As for the rest of us tho... any thoughts?

[DavidB8]

I've thought about it. Seen them for some of the other models just nothing specific to our cars yet. Figured once they came out with one I would install one.

[Kay15]

Is this carbon build up that bad? I read the thread and such is this going to be somthing the dealer will want to charge you money to fix? If so it will be one hell of a labour charge because it is not simple and easy? With the 91/94 octane fuels today this could not be as bad?

[macuser]

my service manager said the b8 doesnt have the same carbon buildup problems as the b7. something about a dual injector or something. i've only been using 93 shell gas. it supposedly cleans carbon buildup. if a catch can is only $100, i will def install just to be on the safe side. i saw some pics of the carbon buildup in the rs4s and b7s and it sucks... really really sucks

[ItsDubC]

Someone w/ an S5 had carbon cleanup done at just 15k miles I believe. Pretty ridiculous.

[Quattrolover]

Someone w/ an S5 had carbon cleanup done at just 15k miles I believe. Pretty ridiculous.

I would be interested in knowing his driving habits, what oil he uses, and what gas he uses regularly.

[ItsDubC]

I would be interested in knowing his driving habits, what oil he uses, and what gas he uses regularly.

This may not answer any of your questions, but here's the thread I'm referring to. Oops, 17k, not 15k

[Kay15]

How does a catch can work:S?

[cory_can]

This was posted on the B8 S4 forum but I don't have any facts to back it up.....maybe this is similar to what "macuser" mentioned in Post #4 above:

"Some one had indicated to me that Audi updated the newer 2.0T and 3.0T whcih has a small port injector so the intake valves gets a bit of fuel coated on them. Toyota/Lexus uses the same approach for their DI engines."

[inNout]

This was posted on the B8 S4 forum but I don't have any facts to back it up.....maybe this is similar to what "macuser" mentioned in Post #4 above:

"Some one had indicated to me that Audi updated the newer 2.0T and 3.0T whcih has a small port injector so the intake valves gets a bit of fuel coated on them. Toyota/Lexus uses the same approach for their DI engines."

Newer meaning which ones?

[B8_Jim]

This was posted on the B8 S4 forum but I don't have any facts to back it up.....maybe this is similar to what "macuser" mentioned in Post #4 above:

"Some one had indicated to me that Audi updated the newer 2.0T and 3.0T whcih has a small port injector so the intake valves gets a bit of fuel coated on them. Toyota/Lexus uses the same approach for their DI engines."

Your saying that the EA888 TFSI in the B8 is both port and direct injection?

[cory_can]

Newer meaning which ones?

I'm assuming S4 3.0, A4/A5 B8 2.0......probably would have added this port injector (if they did), when they redesigned the engine with timing chain, variable valve lift etc.

[Kay15]

Dont are TFSI B8s have timing belts and not timing chains?

[cory_can]

Dont are TFSI B8s have timing belts and not timing chains?

no, B8's have chains now.

[MiracleWhips]

How does a catch can work:S?

Short answer, it is another layer of filtrating unwanted oil vapor and crud getting into your engine's air intake system.

Long answer, not personally educated enough on the topic to explain further. But that is what Google is for.

[ItsDubC]

This is from a Vette forum but I imagine the same applies to the 2.0T TSI:


SHORT VERSION:

Oil Catch Can is designed to effectively separate oil from the crankcase vapors, thereby eliminating all negative effects of excessive intake system oil contamination.

LONG VERSION

The PCV (Positive Crankcase Ventilation) system is designed to regulate and remove fumes from the engine crankcase, and to alleviate crankcase pressure which
could cause oil leaks or seal damage. The PCV system routes crankcase fumes into the intake manifold where they can be burned to eliminate harmful emissions into the atmosphere. The PCV valve controls the amount of crankcase flow volume depending on the engine's load. With large throttle openings (high engine loads),
the more blow-by gases are produced, and the more the PCV system flows oil vapor in to the intake manifold. The PCV valve also functions as a check valve to prevent intake manifold flow from reversing back into the crankcase when there is a backfire, or during periods of high manifold pressure (boost) during forced induction by turbocharger or supercharger.
Negative Effects of your Stock PCV System:
Many owners with LSX engines can testify to the amount of oil residue that can accumulate inside the intake manifold,
throttle body, intake track and even the air filter during aggressive driving conditions.
There are various negative effects when excess oil vapor contaminates the intake
system from the stock PCV system - such as:

*Throttle body and/or MAFS (Mass Air Flow Sensor) malfunction or failure.

*Air filter, intercooler (if equipped) and intake ducting contamination if oil pools and run back out the intake system after engine shutdown.

*Reduced octane of the air/fuel mixture, which can cause detonation and the ECM (Engine Control Module) to retard timing, thereby reducing engine power.

*Excessive carbon build-up on valves, piston crowns, combustion chambers and spark plugs. This also increases the chance of detonation and power loss.

*Increased emissions & possible contamination of catalytic converters and oxygen sensors.

[Kay15]

So the 2.0TFSI have timing chains and not belts? The belt you see behind the radiator is the alternator and crank belt ?
I was positive that they told me it had a timing belt not a timing chain? Now I forget which one is better I know Timing chains get noisey when they must change / they snap, timing belts you dont know really when to change them and they also can snap. Right?

[NWS4Guy]

my service manager said the b8 doesnt have the same carbon buildup problems as the b7. something about a dual injector or something. i've only been using 93 shell gas. it supposedly cleans carbon buildup. if a catch can is only $100, i will def install just to be on the safe side. i saw some pics of the carbon buildup in the rs4s and b7s and it sucks... really really sucks

The Shell gas thing and cleaning the valves is only good if the fuel hits the valve - Direct Injection is where the injector puts the fuel directly into the cylinder, so it never hits the valve to clean it in the first place - hence the carbon buildup issues. I hadn't seen the supposed secondary small injector rumor, and it seems unfounded to me. There is a person who has shown in the past to have insider info, who said that much of this buildup is secondary to the good cooling that Audi has on it's engines, so from the B8 S4 and newer, they have altered engine cooling to allow the oil temps to go about 10 degrees F higher. Comparing the normal oil temps on the S4 to even one model year older Audi's we found that it does indeed run about 10 degrees higher. If this is enough to manage buildup remains to be seen.

The other factor (also relating to temps) is that cars which do not regularly get up to operating temps for a few minutes every so often have much higher buildup issues - namely those which are owned by people with very short and low speed commutes.

if you want some "light" reading, here is a US patent from VW AG talking about thier findings on carbon buildup on DI intakes and what can be done to address it.
http://www.google.com/patents?id=fLI...age&q=&f=false

[kickr]

my service manager said the b8 doesnt have the same carbon buildup problems as the b7. something about a dual injector or something. i've only been using 93 shell gas. it supposedly cleans carbon buildup. if a catch can is only $100, i will def install just to be on the safe side. i saw some pics of the carbon buildup in the rs4s and b7s and it sucks... really really sucks

That's what they will always tell you. Hypothetically, if the successor of the B8 would be available, they'd tell you the same story again.
Honestly, I do not know whats worse. Them not being able to get a grip of this problem that started many years ago with the RS4, or them not officially admitting to this problem.

[Kay15]

So if this impacts performance and such and you are with in the 80 000KM .. You would have them fix it? I would wait till about 40-50K and have them re work the hole thing?

So gas wont fix it and they say it doesnt happenend how do you bring it up to them?

[onlyaudis]

I just got a blow by can for an older B6 A4 and will be installing it next week. A proper can with baffles/filters (not an empty shiny ebay one) will keep oil vapors and other gunk out of your intake and intercooler. That crap also lowers the octane of the fuel mixture, so some people have noticed livelier performance after a good blow by catch can set up has been installed. Some of the usual VAG suppliers now have kits for the B7 cars, maybe the B8 cars will be available soon.