So here is my problem... Smoke that seems to be oil in my exhaust after I boost.

I have already had a leakdown test 7-10% on every cylinder.
I have already had a compression test again no more then a 10 point spread.
I have already double checked oil returns from the APS turbos.
I have already added oil restrictors to the oil feed lines. (A no no but it was a test.)
I'm still making over 430hp... So uhh... Everything seems to work just smooooooooooooooke.

If anyone remembers I installed this APS kit myself, and I've never had any problems with smoke... Now I do after a slight crackup and an oil pan replacement.

The only thing in question is that one of my pipes got hit and could have tweaked my drivers side turbo... I'll have to tear it down to find out. (Have it torn down... I don't want to.)

So how can oil get into my exhausts?

1) Turbos f'ed up leaking.
a)Too much oil pressure
b)No exist for the oil.
2) Ring / Pistons F'ed up.
3) ?
4) ?
5) ?

 

How much oil have you been putting in during changes?

 

s/t or tt? Like above if tt how much oil did you put in the car? Also if tt did you trim the oil return lines?

 

He has the APS twins ^^

 

I haven't run it long enough to determine how much oil its eating if any... I put 300 miles on it since I've got it back from having the body kit installed etc. Only seems to smoke when I gas it...

As far as oil return lines... Yes I trimmed them when I installed them the 1st time.

I put 10k miles on this thing with no smoke... I've changed out the computer added meth and ran another 4k on it with no smoke.

Hit curb, and damaged the oil pan... had insurance replace that... now I smoke, and I've gone back thru this thing...

Trying to find out where this stuff is coming from... I'm going to pull a turbo, but I don't know enough about turbos to diagnose that myself.. I'll send it to APS or someone to figure that out.

 

... I hope you have another car to drive - for the next 6-10 months.

If you have the turbos checked out, I recommend atpturbo.com in FL, USA.

If the compression and leakdown is clean, then its not likely the piston rings. Maybe take the new oil pan off and make sure everything is OK since that is when it started.

How bad is it? Is it possible that it was doing it before and you never noticed?

Definatly check your oil level, that kit is sensitive to over-filled oil (why does it come with a larger pan again??).

 

Well, not APS then...

I do have another car... this is just my money pit.

 

BTW I am sure you have seen this, but if not, APS has posted a nice little page on their site about the oil burning diagnostic. Of course its intended for fresh installs, but its certainly worth going over.

add "/350z/oil_drains/oil_drain_notice.htm" after the ".com" in their web address.

Towards the bottom of the article they mention oil capacity and other potential causes.

 

Yeah I've seen that Phunk gone over it a few times too... Thank you for the link.

 

is the smole comming out of the tail pipe, just making sure it isn't leaking from the pan seal onto exhaust causing smoke from under car. Anyway, find a place that will test oil samples, send them some oil (take off filter, turn on car a couple seconds with bucket in place to catch oil) send that oil and the oild from a car you know should be clean (some car with low miles driven by grandma. If they show high iron content (or something) than you know you have metal on metal internal. once you know the metal type you may be able to narrow the part down. Iron, aluminum, steel, ect.

 

Yeah its tail pipe smoke...

I may just tear the head off myself... Do a visual on the engine.

I'm not afraid of the work, its just been 5 months in the shop due to some problems @ the previous shop and I'm tired of waiting I want it back now and then this crops up... Ahh the joy of highly modded cars.

 

Does it occur during acceleration or only on decel?

 

what color is the smoke?

 

Smoke is blue-ish. Stinks of oil... A/F is pretty darn good 12.5 with meth/water injection.

I leave a jet stream when I take off nothing horribly extream... its really noticeable on decel...

Thought is when under massive vacuum its sucking the oil into the combustion chamber and burning it...

No real visible smoke under normal driving conditions.

 

I think your bearings are shot on your turbos. The smoke on decel 90% of the time happens when the thrust bearing goes bad. I've seen it on an APS kit before and many other cars, my own BMW included. Pull the tintakes off and check your bearing play from front to back. Up and down might be ok but most likely your front to back is going to be more then 1/8" Sorry man

Check you plugs too. If there is oil on them then its the motor. If not then more confirmation that its the turbos.

 

+1

I was thinking the same. Also what color bluish? Might be coolent in the engine what does it smell like? check your plugs to see if it is just a engine problem and not a turbo.

 

Did you hit the curb because the APS kit locked up your steering column?

Sorry, i just had to take another swing at APS.

With regards to your symptoms, i have had the same slight smoking problem on heavy acceleration and then a good burst of burnt oil out the exhaust on quick deceleration. This seems typical on some of the APS TT kits. The Garret turbo seals are metal and i heard that they would cost just as much to repair as if you where to get new turbos.

I can make a massive smoke screen if i let the car idle on a cold day, 50F or colder. I should take pics and post them next time.

Have you tried only filling your oil to the Low marker on your dipstick? That seems to be the best/easiest bandaid for this problem.

 

7-10% leakdown indicates a moderately tired engine, IMHO. Factory engines typically leak down at 1-2%, and even my forged engine after 20K miles of serious abuse leaks down in the 2-4% range.
Take it for what it's worth, but depending on the type and condition of your guy's leakdown tester, and the method and conditions upon which he performed the test...can all skew the results somewhat.

 

APS uses Garrett ball bearing turbos. What thrust bearing are you talking about?

 

Agreed but it would most likely not casue this oil issue.