I purchased a used STS kit from a member here. I recently installed the kit and am now waiting to get it tuned next week. Since installing it, I have only cruised a few blocks in the car once to make sure everything was running good enough to get me to the tuner. I stayed in 1st and 2nd gear, no more than 1/2 throttle, and no higher than 5k rpm. I never really had the car in boost. I did give it a little gas in 2nd and was able to make 1psi, but that was it. It is common for the STS kit to not make much boost in 1st and 2nd off of the wastegate spring (4.5psi), so I was not concerned with the lack of spool and boost from the turbo when cruising in those gears.

Well today I idled the car to move it into my garage. It was then that I noticed a brown sludge/liquid in the exhaust that connects to exhaust side of the turbo. At first I thought it was condensation. But upon further inspection, it turned out to be oil. The oil was pretty clean, so I am guessing that it is coming directly from the turbo. What is causing this?? I did a boost leak test a few days ago; there were no leaks. Could have pressurizing the system cause oil to leak into the exhaust? Any input would be greatly appreciated. I have included a few pics below.

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[IMG]<a href="http://s240.photobucket.com/albums/ff309/skn5002/?action=view&current=phpTBRrmJPM.jpg" target="_blank"><img src="http://i240.photobucket.com/albums/ff309/skn5002/phpTBRrmJPM.jpg" border="0" alt="Photobucket"></a>[/IMG]

 

bad turbo or no oil restrictor

 

...

 

it goes in the oil feed line right before the turbo usually it keeps a excess of oil build up in the turbo so the seals dont blow out. its hard to tell unless you know what your looking for.

 

If you have a restrictor and your seals are fine have a look here: https://my350z.com/forum/forced-indu...r-ic-pipe.html

I built this kit myself and had some issues with smoke, all the problems went away when I installed that small reservoir. In my case, after the car is shut off the oil in the supply line has no where to go. So it just sits inside the turbo, and while the car is off it leaks through the oil seals and in to the compressor/turbine. When you start the car up the oil gets pushed out throught the exhaust.

Something else to consider I guess.

 

The STS kit originally has a small T fitting that taps into the oil sensor unit, which connects to the motor end of the oil feed line to feed the turbo. I did not have this part so I used an oil filter sandwich plate. The oil feed line is connected to a 4AN fitting, which is than tapped into the sandwich plate. I am not sure if the STS kit comes with a restrictor on the turbo side, I will have to check this tomorrow. Is there a chance that the oil filter sandwich plate is now creating too much oil pressure (more than the oil sensor tap).... therefore it would now require the system to have a restrictor?

 

You need a restricotor regardless. It is there to limit the flow of oil to the turbo, therefore reducing the pressure to the bearings. A .065 restrictor should do the trick. The restrictor should be located on the turbo oil inlet.

http://www.034motorsport.com/images/OilRestrictor1.jpg

That is all it is, just a fitting with a small (usually .065) hole drilled in it.

 

My STS kit, new, came with a "4" psi oil pressure valve at the turbo but no restrictor. Is this restrictor something I should install? What does it look like and where do I purchase? I sometimes have oil in the charge tube, as well as coming out the exhaust. This does not happen at the same time and does not seem bad when I run the oil return pump on high speed. I just had car tuned yesterday and punched it, from 40mph-60mph, without turning oil return pump to high and got a 1283 sel.

 

Since the turbo is not water cooled, will the decreased oil pressure from the restrictor hurt the turbo in any way?

 

Double check your wiring to your oil pump. Sounds like its cutting out and its pushing through the turbo seals.

 

That has nothing to do with the oil return line. How's your A/F? Bank2 O2 sensor maybe going bad or vacuum leak. I had some P1273 error before and it turned out a vacuum leak near bank1 was causing it.

 

p1283 has to do with your testpipes i bet dont worry about that.

 

Any reason why I shouldn't add a restrictor to the oil feed line... would that starve the turbo in any way since it is all the way back there in the rear?

 

So I added a 0.065 restrictor to the turbo side of the oil feed line today. Cleaned out the exhaust. Idled the car for a good while and there was no oil ... I was feeling pretty good. But then I took it for a short spin around the block. Came back and surely enough there was some oil creeping out into the exhaust. A lot less this time, but oil was certainly seeping out. I'm bringing it to a shop and letting a them check it out tomorrow.

 

Might need a smaller restrictor, have the shop look at it first, but in my case. I have a .052 restrictor on my turbo, I have an HX35 Holset.

 

I also went from a .062 to a .052 restrictor with my T04S turbo. It was very easy to reduce the restrictor. Since it is made out of brass, I soldered the original hole shut and simply redrilled it out with a smaller bit, .052 in my case.

 

Well there is no more oil in my exhaust. I guess the restrictor solved the problem. I also have my oil pump on high more often now. The oil that was there after the restrictor install was probably just residual oil leftover. I cleaned that out and drove 30 mins to my tuner. Checked the exhaust and there was no oil. Did over 10 pulls on the dyno and there was no oil or smoking so I think i'm golden. Thanks for the help.