Since I went single turbo after a hard WOT run I get a huge blast of white smoke from my exhaust. It dosen't smoke while accerating it only smokes a second or two after letting off the throttle.

Steve Khan told me I should install an oil catch can, would it be the solution ?

What do you guys recommend ?
Which catch can you're using ?

Thanks
Carl

 

Are you sure the smoke is white? That doesn't sound like you're burning oil.

It is common to have black smoke on decel from running to rich, in which case a catch can isn't going to help that.

 

Yeah it's gray/white and it only happens when I push it hard and release the gaz pedal.

what do you suggest ?

 

check the venting from your oil filler assembly very carefully. if there is a plug in the breather hose or you put a 1 way valve in backwards you will smoke on decel after boost.

howard coleman

 

/agree.

There are 2 lines for venting crankcase pressure. Single turbo's almost always have one eliminated due to the difficulty of having a nipple on the intake side of the turbo. The second line is for the PCV valve to the upper intake manifold. If this has been removed or the valve is backwards or failing the crankcase will get pressurized under boost by blowby and force oil through your turbo seals creating smoke on decel and idle. You may be able to test this theory by simply removing your oil cap and going for a test drive.

 

Make sure you have the correct restrictor for the oil feed on the turbo.

Jason

 

uhhhh guys... white smoke is coolant. unless hes talking about smoke coming out of the engine bay its being burnt. oil appears blue out of the exhaust system if its being burnt.

 

Well I happen to have tested this one out first hand. I did the 95 pcv valve elimination long after I did the 2nd oil crankcase line elimination during my single turbo upgrade. I then drove 250 miles to a tuning session and did a james bond cloud of white smoke everytime I stopped.

I was one of the more embarrassing events in my life. And I vividly remember the smoke being very white. Of course it was a sunshiny day with blue skies so its hard to say if it was bluish or not.

Once I put the pcv back and the flushed the intercooler/piping out no more white smoke.

Checking your IC for oil would be another test - that would also be a test for Jason's suggestion. If there is oil in the IC it could be either.

 

Shawnk that's exactly what my problem is, same thing !!! But right now my PCV valve is connected to the UIM exactly like it was with my stock twins. Do you recommend to connect it elsewhere ?

I just checked and there is indeed a bit of oil in my intercooler piping ! I have no clue if I have the right resistor on the turbo, how can I check that ?

Thanks again guys, really appreciated !

 

Have you tried driving without the oil cap on? No way you can build crankcase pressure with it off. If it keeps smoking I would guess you are getting too much oil to the turbo as Jason said. If it doesnt smoke then make sure the pcv isnt clogged or backwards, or replace it. I did finally end up eliminating my pcv but had to get a special collar made to go between the filter and turbo intake with 2 nipples on it and I moved that line to a catch can and then to that collar.

 

If anyone is interested, I solve my problem by installing the Gotham Racing Oil Catch Can. It is directly installed to the oil filer neck.

 

after getting my car tuned by Steve this past weekend I as blowing a lot of white smoke as well after a hard pull on th dyno and street. You say you put one line to the oil filler neck, where did you put the other line? Scrub has his other line fitted into the front surface of his K&N Air Filter on the turbo compressor.

Steve also advised an oil catch can. Does this sound like it will solve my problem as well?

Thanks

 

Stock setup 93 and 94.

One line goes from Filler neck (nipple that is horizontal) to UIM near throttlebody. The PCV valve is in this line.

Second line goes from filler neck (nipple pointing down) to intake side of turbo.



Stock setup 95.

First line above is deleted from factory.

Second is same as 93-94.



Single turbo typical setup.

First line same as 93-94.

Second line is eliminated because there is typically not a nipple to attach to on intake side of turbo.



Single turbo catch can setup.

Cap UIM and remove PCV. Use horizontal nipple to go to catch can and then go from the can to atmosphere through a filter or run can out back to intake side of turbo.

Second line is eliminated - cap vertical nipple on filler neck.

I'll go snap some pics of mine - give me 5 min and I'll post them.

 

^ That's what Scrub has for his single. Line from neck to can, then from can to intake filter on turbo.

Thanks Shawn

 

Line from neck - a clear with white braided hose that came with can.



The capped line that went from filler to UIM - I will cap permanently next time i take UIM off but unbelievably I have gone 1000 miles without pulling it.



The can - I put in spot for cruise control. Red is in from neck, Green out to intake side of turbo.



And I had a collar made with 2 nipples to go between turbo and filter. I put catch can and oil metering on it.

 

you rock Shawn....thanks a lot! I'm sure this will help many.