please help! rb25 problem - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

401imports · 06-17-2014, 08:47 AM

Hey guys I did a rb25det neo swap in my s13. All stock except I put on a Freddy intake manifold and fmic. Now the stock turbo had alot of shaft play and looked really oily so figured it was bad but left it on there. Threw the motor in and turn it on. It runs good and sounds really healthy but after a few min it starts pouring out smoke from the exhaust and dripping oil. I don't have a down pipe yet just threw it in there. But it's dripping oil so I threw a holset turbo on there. Brand nee. Not blown and started I ft up and it's doing thr same thing. Now here is the deal. I pulled all my fmic piping off and it was filled with oil from the stock turbo. After the new one it is still clean but there is oil coming from the intake manifold. So I took off the piping and started it up let it run for a few min and turned it off and when I open the throttle oil comes out. Like alot... what could this be? Alot in there from the blown turbo? I'm getting no blow by what so ever too. Any help please

BenRice · 06-17-2014, 07:55 PM

What vacuum hoses do you have set up? (Best to take a pic of your car)

When i blocked the hose that went from the turbo inlet (ie the pipe that goes from the turbo inlet to the MAF) to the LHS camcover, and diverted the camcover outlet to a catch can the car would pour oil into the inlet via the small hose that goes from the RHS camcover to the inlet plenum, as well as past the oil seals in the turbo. This made it smoke badly, especially when off throttle after being on boost, it also poured a lot of oil into the turbo compressor housing and intercooler. I suspected this happened due to the head having no vacuum, thus the small amount of pressure in the head had to go somewhere. Putting the hose from the RHS camcover to the turbo inlet pipe fixed this.

I hooked my catch can up to where the aforementioned small hose that originally goes from the LHS camcover to the inlet plenum. I just blocked the inlet plenum port.

Since then, no issues with smoke or oil.

If that doesnt work, do a compression test to see if any of the cylinders are low, indicating worn rings or worn valve seals.

401imports · 06-18-2014, 02:14 PM

But I have no intercooler piping on the car as of right now and when I run it and shut the car off and them open the throttle body that's when the oil come out. So there is oil getting into my intake manifold somehow

401imports · 06-24-2014, 10:07 AM

Ok did a compression test and all cyl are from 145 to 160... took off the intake manifold to see if I could see any cracks or anything and I don't see anything. Even the intake manifold and intake ports on the head are pretty clean

bvr463 · 06-24-2014, 11:47 AM

How's your valve stem seals?

401imports · 06-24-2014, 12:13 PM

I have no idea. That was what I was thinking. I ordered them last week should be in within a day or 2. Ima throw those In and go from there

06-17-2014, 08:47 AM	#1
401imports Zilvia Member Join Date: May 2010 Location: rhode island Age: 33 Posts: 173 Trader Rating: (2) Feedback Score: 2 reviews	please help! rb25 problem Hey guys I did a rb25det neo swap in my s13. All stock except I put on a Freddy intake manifold and fmic. Now the stock turbo had alot of shaft play and looked really oily so figured it was bad but left it on there. Threw the motor in and turn it on. It runs good and sounds really healthy but after a few min it starts pouring out smoke from the exhaust and dripping oil. I don't have a down pipe yet just threw it in there. But it's dripping oil so I threw a holset turbo on there. Brand nee. Not blown and started I ft up and it's doing thr same thing. Now here is the deal. I pulled all my fmic piping off and it was filled with oil from the stock turbo. After the new one it is still clean but there is oil coming from the intake manifold. So I took off the piping and started it up let it run for a few min and turned it off and when I open the throttle oil comes out. Like alot... what could this be? Alot in there from the blown turbo? I'm getting no blow by what so ever too. Any help please

06-17-2014, 07:55 PM	#2
BenRice Leaky Injector Join Date: Feb 2011 Location: Mt Maunganui, New Zealand Age: 40 Posts: 84 Trader Rating: (0) Feedback Score: 0 reviews	What vacuum hoses do you have set up? (Best to take a pic of your car) When i blocked the hose that went from the turbo inlet (ie the pipe that goes from the turbo inlet to the MAF) to the LHS camcover, and diverted the camcover outlet to a catch can the car would pour oil into the inlet via the small hose that goes from the RHS camcover to the inlet plenum, as well as past the oil seals in the turbo. This made it smoke badly, especially when off throttle after being on boost, it also poured a lot of oil into the turbo compressor housing and intercooler. I suspected this happened due to the head having no vacuum, thus the small amount of pressure in the head had to go somewhere. Putting the hose from the RHS camcover to the turbo inlet pipe fixed this. I hooked my catch can up to where the aforementioned small hose that originally goes from the LHS camcover to the inlet plenum. I just blocked the inlet plenum port. Since then, no issues with smoke or oil. If that doesnt work, do a compression test to see if any of the cylinders are low, indicating worn rings or worn valve seals.

06-18-2014, 02:14 PM	#3
401imports Zilvia Member Join Date: May 2010 Location: rhode island Age: 33 Posts: 173 Trader Rating: (2) Feedback Score: 2 reviews	But I have no intercooler piping on the car as of right now and when I run it and shut the car off and them open the throttle body that's when the oil come out. So there is oil getting into my intake manifold somehow

06-24-2014, 10:07 AM	#4
401imports Zilvia Member Join Date: May 2010 Location: rhode island Age: 33 Posts: 173 Trader Rating: (2) Feedback Score: 2 reviews	Ok did a compression test and all cyl are from 145 to 160... took off the intake manifold to see if I could see any cracks or anything and I don't see anything. Even the intake manifold and intake ports on the head are pretty clean

06-24-2014, 11:47 AM	#5
bvr463 Zilvia Member Join Date: Sep 2010 Location: kennewick, washington Posts: 192 Trader Rating: (2) Feedback Score: 2 reviews	How's your valve stem seals?

06-24-2014, 12:13 PM	#6
401imports Zilvia Member Join Date: May 2010 Location: rhode island Age: 33 Posts: 173 Trader Rating: (2) Feedback Score: 2 reviews	I have no idea. That was what I was thinking. I ordered them last week should be in within a day or 2. Ima throw those In and go from there