okay guys, need your help with a problem. I picked up an 06 350z w/ a turbonetics kit on it for $14k. Most of my experience is in the NA american muscle field, but decided to take on this project because its a nice looking car and was cheap. Not sure if it was the best idea, i'm sure some wouldve advised against it, but did it anyways. I believe i actually seen a thread on here about someone else asking about buying it and most advised against it. I diagnosed the ticking noise that that guy had mentioned as the aftermarket clutch. push on the clutch, the noise disappears (had my buddy help me out looking into it as he had a pretty heavily modded 350). It does smoke a little and thats why i'm here. other than that, the thing is an unbelievable ride (almost consider it to handle better than my c6). so anyways, i picked this thing up knowing that it would need some work. the problem: it has a little bit of smoke when taken to redline and you let off the gas. Its not anything crazy, but enough to notice. i pulled the turbo off a few hours ago and noticed a decent build up of oil on the tube coming off the compressor and into the intercooler. as far as the rest of the intake goes, its mostly clean. maybe a slight slight haze of oil. I'm thinking that its possible this turbo has a bad seal and gonna send it off to turbonetics to have it inspected. my buddy mentioned that if it smokes when letting off the gas, that its possibly a bad valve. smoke is a little dark in color (definitely not white). and doesnt happen under a light boost (that i can tell, anyways). I'm about to pull of the intercooler and inspect it to see if it has a buildup of oil or not. wanted to know some thoughts or if someone can point me to some reading. i did a quick search and came back with nothing conclusive to my problem. any help will be greatly appreciated! Thanks

-dave

 

1. oil in the pipes check your oil return line

2. Black smoke near redline when letting off gas possibly unburnt fuel=running rich up top

 

We all get a light coating of oil in the pipes...but the smoke you are seeing is probably normal as i see it from just about all the boosted cars in the mid-a.We have to have our engines a little rich when under heavy boost and when your on it and then let off you will normally see a puff of smoke.

 

Probably just over rich...a better tune should fix it. However if it's oil I would place dibs that the TN has weak seals (this seems to be a common issue with them).

 

check the intake for oil, could be oil blowby from the valve covers

 

Search for JETPILOT's thread on crankcase evacuation. The stock setup is for NA and is not ideal for FI. I've tried multiple setups but the bottom line is you are sucking oil out of the crankcase into the lower plenum. On decel at redline is when you have maximum vacuum. You need to seal that port off, drill out the PCV, and feed it (and the driver's side non-valved port) into a catch can filled with steel wool and have the other end of the catch can feed into your turbo compressor side intake tubing (to provide suction that is proportional to load/boost).

 

Run valve cover breather vents into your exhaust after the turbo. See it at the drag strip all the time with high compression v8s. The exhaust will keep it in someone what of a vacum. You need to take a small pipe and angle it into the exhaust pipe, facing the rear of the car, at an angle. This way the exhaust will draw pressure out of the crank case.
Link with pictures to give you an idea.
http://www.teglerizer.com/triumphstu...scavenging.htm

Jegs has the kit you need.
http://www.jegs.com/i/Moroso/710/25900/10002/-1 60$

 

^ that's a lot more work (requires welding), but will work also (perhaps better if implemented correctly). The compressor intake is a bit more environmentally friendly. Keep in mind that with the exhaust vacuum source, you can potentially pull oil into the exhaust and get smoke as before - still need a well baffled catch can.

 

Probably cost 50$ at the most to have a pipe like that welded into the exhaust. Plumb into the catch can first then the exhaust. No pressure in the crank case. The only reason a pcv valve exists is because of emissions.

 

OT bro you have a BMW M6 also..dang nice toys yo.

 

hah. no, dont have a bmw m6 (although would be nice if i did!)... got a corvette c6. still nice toys luxury of being single and no kids!

to the rest, thanks for your advice. really appreciate you all taking the time to help out.

rocks: the first link you posted with pics isnt working. looks like it was shortened and now is posting the shortened link.

after tearing a lot of it apart, not really any visible oil in the intake after the intercooler. just that one tube coming off the compressor is the only place i noticed it. but from the sound of it, probably normal and i'll try one of the ideas mentioned here to get it fixed. as far as the tune goes, i'm gonna try and find a local shop to do a precise custom dyno tune if i can. called about 10 shops last week and most of them only do domestic. so this could be a challenge. anyone familiar with the southeastern area that could point me to a good shop? dont mind driving a few hours.

-also, buying a few new gauges. got the defi control unit II already, just want to match some gauges up to it. is there a forum vender i should consider or another place that has really good deals on defi gauges?

EDIT: actually, not 100% commited to defi gauges either. primarily need boost and wideband. if there is another brand that someone recommends, i'm open for suggestions. Was just looking to defi because of 1. design and 2. had the controller. Thanks again guys!

 

Take it to Forged Performance.

 

awesome, thank you. contacted the company. I'll be going to atlanta in a week, so hopefully they will have a spot open for me. will trailor it up to them.

 

If you're not losing alot of oil and you're still getting power.. it might just be running rich when you let off the gas. Is the MAF is before the BOV??

 

i found part of the problem was with one of the clamps slipping off the rubber connectors going from the compressor to the pipe leading to the intercooler. It had a pretty good boost leak. I'm still waiting for my gauges to arrive, so i didnt notice this right away. I imagine its been like this since I've gotten it because I had the Nissan dealership fix the AC line before I would buy it. They replaced it with a longer line (the heat got the other one) and I now have it wrapped in heat tape. back to the clamp, every time I'd go to tighten it, it would slip up and over the connector on one side (you wouldnt know it unless you were looking for it or in a hurry). whoever owned the car had an HKS blow off valve welded in place of the old TN one, you can definitely hear it now as where before you couldnt really. Plus, a more noticeable SOTP feel to the car when in boost. I'm thinking that the boost leak was a big part of the problem. I now got to dig under the dash for the computer system and see what all is hooked up. I found a data cable coming from the computer area leading into the passenger side of the car. I'm guessing its part of a piggy back system. so i'll be getting into that in the next couple days. someone also already welded in a sensor to the exhaust for the wideband, too. so thats definitly nice. no gauge in place, but the sensor for the gauge is still there along with the wiring harness.

On a side note, what is the major downfall to this system? I've read a lot of people arent happy with the TN system, partly due to welds and the lack of a custom tune. I was thinking about keeping the system because it came with the car. Is this thing going to seriously mess this car up? as i said, the stock bov has been replaced with a nicely welded HKS, so that eliminates that weld problem and I'm getting a custom tune specifically for the car, so should i still consider another kit or will this kit be fine? The car also has Tien springs, Nismo exhaust and (from what ive looked into) a stage 2 clutch (its definitely aftermarket). Also, someone really took the time to wrap almost anything around the turbo or piping in heat wrap. I'm finding some mixed views when doing a search on the kit. I dont want a flame war, just some good insight as to what to watch out for with this kit (besides ac line, bov welds and tune as these have been fixed already). any info is greatly appreciated.