Upgraded Turbos and Emissions effect?

matreyia

Major
Apr 19, 2017
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335i e93
Does anyone know if upgrading to VTT or MMPE turbos messes up emissions tests? That is my concern if upgrading to bigger units. Dinan had some suck ass big turbos and they had a disclaimer that it is not carb testing friendly and would fail state emission tests... I can only imagine the carb emissions issues of even bigger units like MMPE or VTT.

Personal experience or technical knowledge appreciated.

Thanks in advance.

VT
 

JuniorB

Sergeant
May 9, 2017
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Rhode Island
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07 e60
Emmision testing is thru the common failure points, o2s, O2 heaters, and evap. Besides visual ,as long as these are (ready), any hardware won't be an issue. Most have to reinstall the Kitty's and turn off the piggybacks. You want to take every precaution not to get flagged!
 
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matreyia

Major
Apr 19, 2017
1,750
686
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335i e93
Emmision testing is thru the common failure points, o2s, O2 heaters, and evap. Besides visual ,as long as these are (ready), any hardware won't be an issue. Most have to reinstall the Kitty's and turn off the piggybacks. You want to take every precaution not to get flagged!

Dope! Thanks for the quick reply.
 

TWilly

Specialist
Jul 7, 2017
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Tyler
I only have experience as a PA state inspection/ emissions technician , but I'm sure other states with emissions are very similar. but as long as all the monitors (tests) can run and pass and you have other emission components still in use (ie: pcv,Evap, air pump if equipped). then youll be fine and pass emissions. with replacing the turbos the only worry would be if the factory cats could be bolted up to the new turbo (which I believe they both do).

I will say I ran into an issue with my jb4 not allowing the emission machine not communicate with the car but once I put the jb4 in map 0 it worked fine.
 
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matreyia

Major
Apr 19, 2017
1,750
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335i e93
I have seen this happen firsthand. More than once actually.

First time was an s54 (e46 m3 engine). Customer got a CEL and very strange running issues after a track day. Brought it into us and we had a hell of a time figuring out what the issue was, as compression was on low end of the allowable spec. Other than a rough run situation on a cold start. Cold compression was low, but would only slightly increase with oil being put into the cylinders (Wet compression test) . Upon dismantling, catalyst material was found in exhaust PRE-CAT, and what happened was the exhaust valve seats were not sealing properly. I cannot remember at this point whether there was catalyst material in the engine oil or not, but it would seem likely that there was some there.

Second one was on an N55, newer production in an X6. Came in with turbo whine. Removed Cat while replacing turbo to find it badly damaged, further inspection found again, exhaust valve seal wear w/ minor scrubbing/scraping on the cylinder walls, and fine metallic material in engine oil.

It does happen, if I knew why then I would try to explain it better. But @matreyia is not crazy or getting hosed. IT can and HAS happened.
 

matreyia

Major
Apr 19, 2017
1,750
686
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335i e93
What the hell is a catalyst filter?

Ignore him. He is just one of the typical arrogant pricks that come into posts talking doen to people. He and a couple of others went into the "raise your hand if you've bloen up an n54" and started off immediately incredulous about my story about how my engine blew up from a 40 mph pothole which ended up causing the dealer to replace the engine... the part they found so impossible was where I reported that they techs showed me the engine and catalyst material inside the engine at various parts and mixed in the oil with other metal shards.

They kept talking down and lo and behold a mechanic came in to testify that he had personally seen 2 occassions of my situation. But by this time they got so butt hurt they just kept fucking up the thread with insults...with nothing to contribute.