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400rwkw R33 Gtr Track Day.

BOOSTD

By BOOSTD,
in Engines & Forced Induction

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BOOSTD Mentor

BOOSTD

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I attended a track day a Mallala on Saturday, had an absolute ball. I did however have some issue's.


-My Oil/Air separator would fill in one 15min session(400ml).


-My Atmo BOV's were spitting out so much oil the side of the car was coated.


-After a heavy G-force loaded corner(not the straight) a large puff of smoke would come out the exhaust on gear change


-My dip stick blew out twice


-All of which required the replacement of 4ltrs of oil.\

The car was running 30psi of boost for 40% of the day. I would like to ascertain if my oil control issue's are attributed to blow-by(CP forged Pistons, 1mm oversize valves--with new valve guide's) or incorrect oil/air separator setup for my huge boost levels. I am running a N1 oil pump, big sump and the 1.5mm restrictor in the block has been removed(previously fitted with the std sump).

Plans before the next track day so far are.


-Plumb my catch can into the sump


-run less boost


-heat shrink my dipstick to hold firmer(however I think this is a symptom fix)

Edited by BOOSTD
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STATUS Grand Master

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oh dear could be a few things but if your bovs are venting oil and your oil air separator is to atmosphere you have turbo issues. if it is recirc you have either oil surge of excessive blow by. the puff of smoke leads me to believe surge but without seeing the car in person it is a guess at best.

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STATUS Grand Master

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^^^ its a bit long winded..... we spin our 350rwkw 26 to 8000 all day long at track days with only sump baffle and head oil restrictors.... most issues are build related like piston to bore clearance and bearing clearance etc....

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STATUS Grand Master

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The Oil/Air catch can is plumbed back in the intake.

Any tests could do to narrow it down?

this pretty much rules out the turbos, do you overfill? do you have a sump baffle?

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STATUS Grand Master

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Well the head restritor is one thing I don't have with my N1 pump, I guess the fix for that without pulling the head is an external drain from head to sump.

just as easy to fit restrictor.... to do the drain properly requires either engine out or head off anyway.

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1400r Veteran

1400r

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put a filter on the top of your catch can equal to the size of the hoses going to it

i.e 2 2.5cm hoses then 5cm fitting filter

mate did this on his ceffy that use to filer his catch can every three laps of Mallala

and now has no blow by

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