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07-31-2015, 02:59 PM | #1 |
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Smoke and Catless Downpipes
I recently installed a JB4 G5, running map 2. My mods are in my sig. Previous to installing it i was running without a tune for quite some time. There was a large amount of white smoke coming out of the exhaust, which most was due to not being tuned.
Once I installed the JB4 the smoke was not as bad but still noticeable. For example when I come to a stop i can see the smoke go past my window. Now I have had it checked for oil leaks and there are none. My concern was the turbos, so I also had BMW run a full diagnostic and they see nothing wrong with the turbos. So my question is how much smoke is normal when running catless downpipes? I can also smell gas through my vents when WOT.
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2009 135i Jet Black / JB4 G5 ISO / cp-e Catless Downpipes / cp-e Midpipes / cp-e Axle Back / Stett Charge Pipe w Tial Q BOV / BMS DCI / H&R Front Sways |
07-31-2015, 06:09 PM | #2 |
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First:
Can you smell gas when you first start the car? Second, and your primary question: The stock primary cats are 600cpi, and the secondary (N54) cats are 200cpi. If you delete the primary cats (catless DPs), you will certainly get some more exhaust smell, or odor. You have removed the majority of the precious metals that react with exhaust fumes and more of the raw exhaust gases are escaping. They stink. There are many folks who believe doing this and keeping the stock N54 midpipe with cats will eventually lead to secondary cat failure. Mine are fine so far, but we'll see.
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07-31-2015, 07:07 PM | #4 |
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Explains it.
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08-02-2015, 08:43 PM | #5 | |
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08-04-2015, 01:21 PM | #6 | |
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I would be shocked if he pulled the intercooler and it didn't have oil in it. Doesn't mean the turbos are leaking (and doesn't rule it out either). |
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08-04-2015, 02:07 PM | #7 | ||
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08-04-2015, 02:13 PM | #8 |
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I've removed the factory FMIC before and there was some oil in the piping, but not much. Same in the intake. Isn't that normal though. It wasn't excessive amount of oil
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08-04-2015, 02:17 PM | #9 | |
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08-04-2015, 06:25 PM | #10 |
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08-04-2015, 07:27 PM | #12 | |
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08-05-2015, 12:14 PM | #14 |
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The thing is, my turbos have already been replaced by BMW at 30k miles; turbo failure. I am at 60k miles now. Whats the chances of them going again? And i do not beat on my car, regular maintenance etc. Could it be an exhaust leak? Like the downpipe gaskets.
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08-05-2015, 01:16 PM | #15 |
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Easy to check downpipe gaskets. Just look under there, if there's black soot at the midpipe/dp connection, there's a leak.
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08-06-2015, 01:55 PM | #16 |
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I would get an oil catch can. that's probably a good part of your problem with both oil in the chargepipe and smoke out the tail.
Also I would give your spark plugs a look-see. You may be slightly miss-firing which would be dumping that unburnt fuel into your turbo's/exhaust. Another culprit of smoky exhaust. Just some more food for thought. Please let us know if you find something out!
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08-06-2015, 03:13 PM | #17 | |
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08-07-2015, 10:55 AM | #18 |
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UPDATE: I have determined it is my turbo seals unfortunately. Biggest giveaway is the high oil consumption. Does anyone know what kind of cost im looking at with having those replaced??
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08-10-2015, 12:43 AM | #19 |
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Yep I knew it. That sux you've already had them replaced once. I would but a claim in for a goodwill repair through BMW. You really need to push for that! Hope it all works out for you as I know how much of a pain in the ass blown turbos are...!
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08-10-2015, 06:51 PM | #20 |
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Working on having bmw cover it. Expecislly because they have already replaced my turbos.
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08-11-2015, 12:11 PM | #21 |
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If you get BMW to cover it with all of your mods you hit the Lotto!
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08-17-2015, 08:12 AM | #22 |
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