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Roun Roun is offline
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Car: 07 335i
Exclamation Decel Smoke - 07-04-2022, 03:15 PM

please any direction is appreciated!! Thank you.

2007 bmw 335i e90 184k miles (owed for 2 years since 158kish miles)
weekend driven only

FBO
RB PCV Valve
HighSide OCC
index12s
19ts v3 10k miles
duel 450s
pi
full e85
full vrsf 3.5 race exhaust
custom tuned mhd jb4 bef 26-28lbs peak

compression test as of 7/3/22
c1-180
c2-170
c3-170
c4-170
c5-170
c6-165

issue: greyish burnt plastic smell smoke on decel. Does NOT smoke until car is above 160. losing about .5 - 1 qt of oil during a weekend worth of driving.
NOTE: rear main does indeed leak.

first bought the car it had blown stocks. changed them to 19ts v1 these lasted til 17k miles (rear turbo seal had blown and could see oil through it.)
installed NEW 19t v3s in hopes they were better with "upgraded internals" the smoke did not stop but was not near as bad. months later its bad. im given in and hitting forums because ive done everything i can research besides installing an external lowside occ and change my valve stem seals.


installed NEW coolant and oil lines. theyre not kinked.
RB PCV O ring is fine,
Pcv valve passes blow test
replaced flapper with new one to make sure it was fine.
car does not overheat
NEW VC & VCG installed 4 weeks ago
occ has been recently emptied.
no puff of smoke on start up cold; it will sometimes smoke after start up once car has sat after warmed up but goes away after few mins at idle.
********* removed 4 weeks ago; did not see any oil seepage

no i didnt look at my exhaust ports when turbos were off.

Last edited by Roun; 07-04-2022 at 03:53 PM..
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Rob@RBTurbo's Avatar
Rob@RBTurbo Rob@RBTurbo is online now
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Default 07-05-2022, 02:19 PM

Do a leakdown test, it is better than compression test.

If that checks out going with RB external PCV with plugged head ports really bulletproofs the PCV setup for life (rules out issues with the valve cover or valve cover gasket).

If still does it after that probably unfortunately is the china turbos again. People don't get this it seems but they are really built/balanced poorly with very little consistency.

Rob


See www.rbturbo.com for N54 Twin Turbo Bolt-On upgrades, or contact directly 314-630-8950 rob.rbturbo@gmail.com for a price quote.
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Roun Roun is offline
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Car: 07 335i
Default 07-05-2022, 04:23 PM

will do. thanks for the reply.

valve stem seals really that rare to go bad? i see different things about them.



Quote:
Originally Posted by Rob@RBTurbo
Do a leakdown test, it is better than compression test.

If that checks out going with RB external PCV with plugged head ports really bulletproofs the PCV setup for life (rules out issues with the valve cover or valve cover gasket).

If still does it after that probably unfortunately is the china turbos again. People don't get this it seems but they are really built/balanced poorly with very little consistency.

Rob
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Default 07-05-2022, 04:50 PM

Quote:
Originally Posted by Roun
will do. thanks for the reply.

valve stem seals really that rare to go bad? i see different things about them.
They can, but not hugely common, plus usually leads to mostly smoke on startup.


See www.rbturbo.com for N54 Twin Turbo Bolt-On upgrades, or contact directly 314-630-8950 rob.rbturbo@gmail.com for a price quote.
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