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bm880 bm880 is offline
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Default SOLVED - Smoking under vaccum - 02-06-2019, 09:41 PM

Hi guys, i was wondering if any one had this kind of problem.

My car smokes when it is under vaccum, only when releasing the acelerator after building reasonable ammount of boost. Car runs extremely fine besides that..

LINK TO VIDEO: https://youtu.be/CenkBkvym60

Idle = no smoke
Cruising = no smoke

OCC installed
MMP Inlets
Brand new rebuilt turbos (second time)

Appriciate any help!

Last edited by bm880; 04-08-2019 at 08:13 PM..
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Deen@StreetKingImports Deen@StreetKingImports is offline
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Default 02-07-2019, 08:43 AM

From my experience it was turbo seal that caused my smoking after letting of throttle with some boost. Rebuilt turbos doesn't mean they were built right.
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chadillac2000 chadillac2000 is offline
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Default 02-07-2019, 10:15 AM

I see this thread once every few weeks. It's turbos unless you have an obvious leak in your PCV system somewhere or need more serious top/bottom end attention.

https://www.n54tech.com/forums/showthread.php?t=47855


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bm880 bm880 is offline
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Default 02-07-2019, 10:52 AM

After installing the turbos and warming up on idle... i’ve dynoed, on the first pull it already started to smoke. I mean, rebuilt turbos can be this bad??
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Deen@StreetKingImports Deen@StreetKingImports is offline
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Default 02-07-2019, 12:34 PM

Quote:
Originally Posted by bm880
After installing the turbos and warming up on idle... iíve dynoed, on the first pull it already started to smoke. I mean, rebuilt turbos can be this bad??
Same thing happened with my stock turbos, after warm up they smoke after I left off throttle under some boost. Upgraded to single turbo and never looked back. Hybrids are just not reliable for this platform
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748adam 748adam is offline
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Default 02-07-2019, 12:36 PM

I had exactly the same issue, swapped my stock turbos for pure stage 2 high flows and the smoking went away.
I tried pcv, cam cover, oil feed and drain lines before swapping the turbos.
Probably not the news you wanted but the prognosis looks like new turbos needed
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bm880 bm880 is offline
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Default 02-07-2019, 03:06 PM

Quote:
Originally Posted by Deen@StreetKingImports
Same thing happened with my stock turbos, after warm up they smoke after I left off throttle under some boost. Upgraded to single turbo and never looked back. Hybrids are just not reliable for this platform
Thanks guys! Maybe ill upgrade to single!
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Rob@RBTurbo Rob@RBTurbo is offline
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Default 02-07-2019, 03:30 PM

What kind of rebuilds are they, should go without saying that not all rebuilds are created the same.

In short shop x,y,z, etc etc can have a large difference on what is reliable and what is not. Many shops are literally still using balancing machinery from the 80's, as they still can be very a popular entry level piece of equipment. However they are also incapable of doing a great job, yet some vendors (even some very popular in this platform) still use it.

But agree many of times it is the turbos when you have these issues- especially if ruling in a questionable turbo build.

Rob


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bm880 bm880 is offline
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Default 02-07-2019, 05:01 PM

Quote:
Originally Posted by Rob@RBTurbo
What kind of rebuilds are they, should go without saying that not all rebuilds are created the same.

In short shop x,y,z, etc etc can have a large difference on what is reliable and what is not. Many shops are literally still using balancing machinery from the 80's, as they still can be very a popular entry level piece of equipment. However they are also incapable of doing a great job, yet some vendors (even some very popular in this platform) still use it.

But agree many of times it is the turbos when you have these issues- especially if ruling in a questionable turbo build.

Rob
Thats the point... rebuilt shops uses very outdated equipments and components, guess iíll just use those until it blows
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Default 02-07-2019, 05:35 PM

Quote:
Originally Posted by bm880
Thats the point... rebuilt shops uses very outdated equipments and components, guess iíll just use those until it blows
That is correct many do and sounds like you could have had one of them do the work for you.

Rob


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bm880 bm880 is offline
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Default 02-07-2019, 08:10 PM

I’ll keep you guys updated !
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bm880 bm880 is offline
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Default 03-14-2019, 09:10 AM

Just a quick update... yesterday my oil level was a bit low, filled up but forgot to tighten up the oil filler cap (haven’t noticed that at the time).

Smoke suddenly stoped... my guess is that I dont have any turbo issue, maybe a clogged breather? What you guys think?
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chadillac2000 chadillac2000 is offline
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Default 03-14-2019, 09:36 AM

Wishful thinking. If your oil was low in the first place, you're probably pushing oil through the turbo seals like we've been saying.


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bm880 bm880 is offline
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Default 04-08-2019, 08:09 PM

Fixed... changed VC + gasket, 500 miles on it and no issues so far..

Turbos just fine...thanks guys
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codesx codesx is offline
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Default 04-09-2019, 10:27 AM

Nice bm880. Hoping it stays this way.

How long did the last turbo rebuild last?

What boost are you running?

Keep us posted over time as well.


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nefariousminion nefariousminion is offline
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Default 04-09-2019, 10:38 AM

Quote:
Originally Posted by bm880
Fixed... changed VC + gasket, 500 miles on it and no issues so far..

Turbos just fine...thanks guys
Nice- I have the exact same smoke symptoms since deleting secondaries. Does anyone know why this happens if you have a vc leak? I just did vcg and pcv but i am still getting oil in the injector galley.
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bm880 bm880 is offline
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Default 04-09-2019, 12:08 PM

Quote:
Originally Posted by codesx
Nice bm880. Hoping it stays this way.

How long did the last turbo rebuild last?

What boost are you running?

Keep us posted over time as well.
Well, now iím 99% sure that my turbos were always fine, the problem was on the VC all the time!! I did call them for warranty and both turbos were fully rebuilt (maybe unnecessary). For the time im sticking with 22psi

Iíll keep you guys updated overtime!

Quote:
Originally Posted by nefariousminion
Nice- I have the exact same smoke symptoms since deleting secondaries. Does anyone know why this happens if you have a vc leak? I just did vcg and pcv but i am still getting oil in the injector galley.
Maybe your oil leak is because you didnít tighten up the bolts properly or you have a bad gasket.
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