Guest dan4011 Posted September 22, 2006 Share Posted September 22, 2006 well, i have a hybrid t3/t4, the generic brand you see on ebay all the time, during the begining of the build the turbo didnt get oil for a little bit, and it smoked for a little bit, then over time the smoke stoped and the turbo worked right, over time i noticed a bit of smoke coming from the filter on the valve cover and from the turbo itself. and driving home today i noticed a considerate amount of white smoke out of the turbo itself, the outlet on the valve cover, and accosionally the tailpipe, and testing it today there was a spay of oil on my driveway behind the mufler after revving it to see what was going on. so what im thinking is my turbo pretty much went out, during the build the car did overheat pretty bad right after the rebuild on the first start becuase of a thermostat problem, but it was only for a short period. also when i was looking at it on a lift today i noticed some burnt oil between the bottom of the compressor housing and exhaust housing. what im hoping is its the turbo gone bad, but im hoping the block itself isnt whats cousing the smoke. anyone have any input on this. hopefully all i need is a quality turbonetics or gerret turbo. Quote Link to comment Share on other sites More sharing options...
zeiss150 Posted September 22, 2006 Share Posted September 22, 2006 I might guess that the smoke out of the turbo is from running it really hard and then shutting off the car without letting the car/turbo cool down. If you didn't let the turbo cool down then you might have coked the oil and messed up the turbo seals. if thats the case then oil will leak out of the center section and run down through the turbine and into your exaust... I don't think it would hurt your engine, as long as you didn't run the car once it over heated .... but I'm wrong all the time:redface:. Good luck, keep us posted. Quote Link to comment Share on other sites More sharing options...
240zV8 Posted September 22, 2006 Share Posted September 22, 2006 i've never seen oil burn really white, it's always been moisture of some sort that caused that. Did it have a blueish color to the smoke?... Quote Link to comment Share on other sites More sharing options...
Guest dan4011 Posted September 23, 2006 Share Posted September 23, 2006 well.. it seems the smoke from the valve cover means blowby from the rings, and oil burning. which im thinking is from a previous overheating. because ive only been at 7psi. so this sucks... need new block, anyone wanna donate? Quote Link to comment Share on other sites More sharing options...
eec564 Posted September 23, 2006 Share Posted September 23, 2006 Out of curiosity, how hot did your head get? I've had mine up to 230 after shutting off my motor on a hot (105) day and letting it sit not running. That is, of course, according to my stock gauge. The hottest while driving was just to the right of the letter F on the temp gauge. I'm really just looking for an upper limit before I should back off the gas and let it cool down. I normally get very paranoid around 200-205 knowing my thermostat is 158 (70C, opening at 168F, closing at 158F, tested on my stove). Quote Link to comment Share on other sites More sharing options...
Guest dan4011 Posted September 23, 2006 Share Posted September 23, 2006 the time it overheated, i dont know how hot it got. because my thermostat wasent working at the time, it overheated during the initial start up because the thermostat wasent opening up and letting water in the motor. but with normal driving, in all the Zs ive had, the thermostat usuall just sits right about at the f. over or under a bit is usually fine also. if it goes a considerable amount over the f, thats probably getting a bit too hot. Quote Link to comment Share on other sites More sharing options...
veritech-z Posted September 23, 2006 Share Posted September 23, 2006 posted by dan4011: it seems the smoke from the valve cover means blowby from the rings, and oil burning That could also be bad valve seals. If you were getting blowby from the rings, that should go down to the crankase, not up to the head, or so I imagine. Quote Link to comment Share on other sites More sharing options...
Guest dan4011 Posted September 24, 2006 Share Posted September 24, 2006 smoke could go to both, valve seals were good when i looked, plus ive got just a bit of missing, which seems like a result of a changed compression ratio. Quote Link to comment Share on other sites More sharing options...
BirdmanZ Posted September 24, 2006 Share Posted September 24, 2006 Have you pulled the dipstick? I would check to make sure the oil isn't milky and do a compression test to try and eliminate the engine being the problem. Good Luck. Brandon Quote Link to comment Share on other sites More sharing options...
twoeightythreez Posted January 7, 2007 Share Posted January 7, 2007 My 280z that I swapped an L28ET into has what I think is the turbo dumping oil into the exhaust. I start it up and no smoke, and if you let it idle for 10 minutes smoke will start POURING from the exhaust. If I pull the breather hose off no smoke comes out (of the valve cover)while it's doing this, and compression is great. I still have the hose connected to the TB but I installed a 2nd pcv valve (I cut the nipple off the TB and the stock PCV just threaded in...like it was made to go there..the PCV threads are a lot harder than the aluminum of the TB) to keep from pressurizing the engine under boost. It works well, I can blow thru the hose but can't suck air thru it. If I drive the car it smokes for a few minutes and then goes away. It starts smoking again after a few minutes idling, any ideas? Quote Link to comment Share on other sites More sharing options...
george.bryant Posted January 25, 2007 Share Posted January 25, 2007 My 280z that I swapped an L28ET into has what I think is the turbo dumping oil into the exhaust. I start it up and no smoke, and if you let it idle for 10 minutes smoke will start POURING from the exhaust. If I pull the breather hose off no smoke comes out (of the valve cover)while it's doing this, and compression is great. I still have the hose connected to the TB but I installed a 2nd pcv valve (I cut the nipple off the TB and the stock PCV just threaded in...like it was made to go there..the PCV threads are a lot harder than the aluminum of the TB) to keep from pressurizing the engine under boost. It works well, I can blow thru the hose but can't suck air thru it. If I drive the car it smokes for a few minutes and then goes away. It starts smoking again after a few minutes idling, any ideas? I need to replace my PCV valve, but the factory PCV valve under the inlet manifold didnt have enough clearance for when i upgraded my turbo, So I pulled it out and bunged it and let the block breath. Now I'm having major issues with alot of stumbly low power engine response, the car is a dog and when the turbo kicks in it doesn't feel quite right. This is only the 4th day the upgraded turbo has been on my motor and for the first 2 days it was ok. But now things dont seem so good now. Could it be the PCV? If so, is it tru about what you said about the nipple on the TB? What do you mean by cutting the nipple off and threading in a new valve? Can you please give me a description of what needs to be done? Thanks Quote Link to comment Share on other sites More sharing options...
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