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Turbo Or Motor?

l0WRB

By l0WRB,
in Engines & Forced Induction

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l0WRB Mentor

l0WRB

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Posted (edited)

ok cut a long story short.

rb25det 350rwhp 20psi kkr480 turbo done 50,000kms or so since new.

ive been running no bov for pretty much the whole 50,000kms.

ive notice last few months if i bring it on boost 20psi and as soon as i back off it will dump some oil out the rear, wont do it driving normally or idling.. just after a big compressor surge ...

if fitted up a greddy bov just before throttle body. anyway basically its stoped the oil dump after a big decel from what i could see atleast.

could the compressor surge be causing the oil 2 get past the seals and out the exhaust?

i hate bov's i really really do..id rather not run one.. car seems 2 come on alot harder/better without any bov..

i just get fu k ed off with the oil smoke after a i get into it. embarrasing haha.

any ideas? or could it be my motor?

Edited by l0WRB
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l0WRB Mentor

l0WRB

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If you have in and out shaft play then it is the turbo. Or check oil drain pipe make sure its not kinked and engine is not over filled.

engine is not over full, only done oil change 200kms ago.

oil return line isnt kinked either.

took 4 a spin just before tightened the bov right up.

20psi right under it and backoff it dropped a puff of oil smoke hrmm

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l0WRB Mentor

l0WRB

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Could it be the PCV or crank case breather? Are you running a catch can?

There is a lot of manifold vacuum at close of throttle, it could be related to that.

PCV isnt hooked up

breathers are running back into the intake pipe.

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MBS206 Grand Master

MBS206

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PCV isnt hooked up

breathers are running back into the intake pipe.

Get a catch can on it. My RB25/30 was dumping alot of oil out the breathers on back off on the dyno...

Also found it severly breathing oil on the track though too...

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l0WRB Mentor

l0WRB

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Get a catch can on it. My RB25/30 was dumping alot of oil out the breathers on back off on the dyno...

Also found it severly breathing oil on the track though too...

yes mine also breaths heavy after a good thrashing or on dyno..

mite get a bit of oil in intake and front cover of turbo after 5000kms and hard thrashing

mite try just venting the breather with a filter.

just the smell annoys me smelling it breathe

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MBS206 Grand Master

MBS206

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yes mine also breaths heavy after a good thrashing or on dyno..

mite get a bit of oil in intake and front cover of turbo after 5000kms and hard thrashing

mite try just venting the breather with a filter.

just the smell annoys me smelling it breathe

Put a catch can on, and plumb it all in properly.

This is what they're for!

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